BLEACHING AGENT PREPARATION AND USE THEREOF WITH POLYMERIZABLE COMPOSITIONS FOR OPTICAL MATERIALS.

Abstract

The present invention relates to a bleaching agent comprising: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a coloring component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A), the particles of the coloring component (B) having an average size equal to or less than 400 nm. The present invention also relates to the preparation and use of the above bleaching agent with polymerizable compositions for optical materials.

Description

WHITENING AGENT PREPARATION AND USE THEREOF WITH POLYMERIZABLE COMPOSITIONS FOR OPTICAL MATERIALS field of invention The present invention relates to a whitening agent, its preparation process and its use with polymerizable compositions for optical materials. Background of the invention Polymeric materials, such as plastics, have been developed as alternatives and replacements for silica-based inorganic glass in applications such as optical lenses, fiber optics, automotive, nautical and aviation windows and transparencies as well as transparent elements for electronic devices. These polymeric materials, also known as organic glasses, can provide advantages over glass, including break resistance, lighter weight for a given application, ease of molding, and ease of staining. Representative examples of these polymeric materials include all allyl polymers such as poly(allyl carbonate) polymers. Allyl polymers, for example, are particularly suitable for producing organic glasses or transparent coating films, in particular ophthalmic lenses, or elements of optical devices. The light that reaches and enters the human eye is divided into visible light, which comprises wavelengths of about 380 to 780 nm, and non-visible light, which includes light in the ultraviolet (UV) range (wavelengths of about 280 to 380 nm) and the infrared range (near IR light around 780 to 1400 nm). Since overexposure to UV radiation is known to be harmful to the human eye and foot, organic glasses, including spectacle lenses and sunglasses, are desired in many applications to possess ultraviolet (UV) light blocking properties. Particularly organic glasses must be able to cut light in certain UV wavelength ranges, for example 380 nm to 450 nm. To produce organic glasses that have UV cutting properties, UV absorbing compounds (UV absorbers), such as pigments or dyes capable of absorbing UV radiation, are generally incorporated into the allyl resin that forms the glass. For example, JP H10186291, JP S60245607 and EP 3270212A1 describe transparent, optical articles based on allyl polymers and having UV cuts in the UV region of the light spectrum, which are prepared by using selected benzophenone and benzotriazole compounds as carbon absorbers. UV. In general, the amount of UV absorbers that have been incorporated into the polymerizable composition depends primarily on the desired UV cutoff, that is, the UV wavelength at which the total light transmittance of a lens having a given thickness is lower than a desired threshold. In order to produce lenses capable of cutting UV light, it is necessary to incorporate quantities QAcicnn / zznz / E / YiAi relatively high UV absorbers in the polymerizable composition, for example, up to 3.0% by weight based on the weight of the polymerizable composition. However, the incorporation of large amounts of UV absorbers leads to polymeric materials that have a yellow color, the intensity of which increases with increasing amounts of UV absorbers present in the material. The yellow color makes the polymer material unsuitable for the production of neutral, that is, colorless lenses. Therefore, yellowing is a relevant problem, especially when lenses having a cutoff wavelength in the violet-blue region, that is, within the wavelength range of 380 nm to 500 nm, particularly 400 nm to 420 nm (so-called “high energy visible” (HEV) light or “blue light”), has to be manufactured. On the contrary, yellowing does not represent a particular disadvantage in the manufacture of sunglasses, since after polymerization the lenses obtained are tinted with dyes that completely mask the yellow color. In the known art, to overcome the above disadvantages and produce neutral, transparent lenses, it is known to "whiten" (or "blue") the polymer material by incorporating coloring agents into the polymerizable composition. Coloring agents, also known as "bleaching agents" or "bluing agents", generally comprise at least one coloring compound having a blue color, which interacts with the incident light radiation to compensate for the yellow color produced by the color-absorbing compounds. UV. This whitening effect causes the color of the slow to be perceived as neutral by the human eye. Whitening agents are typically incorporated into the polymerizable composition in the form of a concentrated composition (master batch). A bleaching agent in masterbatch form generally comprises: (i) a polymerizable component, for example based on an ayl resin; (i) a coloring component comprising at least one blue pigment or dye, possibly in combination with pigments of a color other than blue; (i¡) optionally a dispersant to keep the coloring component well dispersed in the polymerizable component (i). Whitening agents in this manner may contain dyes, i.e. coloring compounds that are substantially soluble in the polymerizable composition, or pigments, i.e. coloring compounds that are substantially insoluble in the polymerizable composition and thus remain suspended therein. When insoluble pigments are used, the whitening agents are generally prepared by homogenizing the pigment particles dispersed in the polymerizable component using mixing devices, such as stirrers, dispersers, ball mills or rollers, as described, for example, in JP H05194616, EP 1331494A1, JP 2003105227 and US 9411076B2. The average particle size of the pigment particles used to whiten the polymerizable composition is known to be an important factor in controlling haze in polymerized lenses. US 9411076, for example, describes polymerizable compositions comprising: (a) allyl diglycol carbonate; (b) a pigment component comprising: (i) an ionic or amphoteric dispersant material; and (i) pigment nanoparticles uniformly dispersed in the material QAacnn / zznz / E / YiAi dispersant (i), wherein the nanoparticles have an average particle size of up to 500 nanometers. In US 9411076, the use of particles having a size larger than 500 nm is not recommended because it is said to frequently lead to increased turbidity in the polymerized product. In US 9411076, the pigment dispersion is obtained through a two-step process that includes: (i) a pre-dispersion step carried out by grinding a mixture of pigment particles and a polymeric dispersant using a sesta mill. ; (i) a final dispersion step which is achieved by further grinding the mixture in a bed mill using a YTZ grinding media. The effectiveness of a bleaching agent in masking yellow color caused by UV absorbers depends on a variety of factors. Soluble dyes, for example, have the advantage, compared to insoluble pigments, of correcting unwanted yellow color without significantly increasing the haze of the final lens. In fact, due to their substantially complete solubility in the polymerizable composition, the dyes minimize the diffusion of incident light within the polymerized products and thus reduce haze. Compared to insoluble pigments, however, dyes have the disadvantage of being more likely to decompose during the polymerization reaction in the presence of certain radical polymerization initiators, especially peroxide initiators such as alkyl peroxide compounds (e.g., peroxydicarbonate of isopropyl peroxydicarbonate (IPP) and isopropyl sec-butyl peroxydicarbonate) and aroyl peroxide compounds (for example benzoyl peroxide). Degradation of dyes during the curing step reduces their effectiveness as whitening agents. Peroxide initiators, however, are the most widely used class of radical polymerization initiators used as curing agents for allyl-based polymerizable compositions. Whitening agents containing insoluble pigments are more resistant than dyes to decomposition caused by the oxidative action of radical polymerization initiators. The pigment particles, however, have a greater tendency to aggregate forming colloids in the polymerizable composition, which can interfere with the radiation of incident light (called Tyndall effect) which increases the turbidity of the polymer material. The Tyndall effect is especially marked when the particle size of the pigment or colloidal aggregates is close to the wavelength of the incident light radiation. To improve the effectiveness of soluble dyes as bleaching agents, polymerization initiators capable of generating free radical species that do not significantly deteriorate the dyes have been suggested for example in US 5599876, WO 2001 / 16194, WO 2000 / 31584 and EP 3381951A1. Polymerization of allyl polymers in the presence of these weaker radical polymerization initiators, however, requires higher curing temperatures in order to properly generate free radicals capable of completely curing the polymerizable composition. Curing at high temperatures, in turn, results in polymerized materials that are brittle and prone to breaking or being damaged during the cured product demolding step. Furthermore, in the presence of these initiators, longer curing cycles are necessary to reach a level QAcicnn / zznz / E / YiAi of satisfactory polymerization of the lens, thus decreasing the productivity of the manufacturing process. The preparation of ophthalmic lenses or optical elements using pigment-containing whitening agents is described for example in JP H05-194616, EP 1331494A1, JP 2003105227 and US 9411076B2. The effectiveness of a bleaching agent also depends on its stability, particularly the ability of the bleach dispersion agent to prevent uncontrolled formation of flocculates (i.e. aggregates). When a pigment dispersion is not sufficiently stabilized, precipitation of the pigment particles can easily occur within the container (the so-called “cake effect”), which alters the chemical composition of the whitening agent. Clearly, modifications of both the total content of the pigment particles as a dispersed phase and the weight ratios between the pigment particles of different colors with respect to the initial formulation of the bleaching agent can greatly affect the color and optical quality of the pigments. final optical materials as well as the ability to reproduce their characteristics. In view of this phenomenon, pigment dispersions are generally carefully redispersed before being used to prepare the polymerizable compositions, for example by subjecting them to mixing, stirring or sound wave treatments. Very frequently, however, these treatments do not lead to complete re-dispersion of the pigment particles. Therefore, in order to use bleaching agents that show optimal and reproducible bleaching effects, stabilization of the pigment dispersion is of utmost importance. Brief description of the invention Problem that the invention will solve In view of the state of the art described above, applicants have faced the problem of overcoming or at least improving some of the disadvantages set out in the above. Particularly, a scope of the present invention is to provide a whitening agent that allows the production of plastic optical materials, especially based on ayl polymers, particularly ophthalmic lenses that are transparent, colorless, have minimal haze and exhibit light blocking function. UV, especially in the blue light wavelength region of the spectrum, i.e. within the range 400nm to 450nm, preferably 400nm to 420nm. These optical properties have to be achieved without deteriorating, as much as possible, other favorable properties of plastic materials, particularly mechanical properties such as hardness, impact resistance and abrasion resistance. Means to solve the problem Applicants have now found that the above technical problem and others that will be presented more clearly from the following description can be at least partially solved by a bleaching agent in which an improved stabilization of the pigment particles is obtained through the combined action of a polymerizable component based on allyl aromatic and a polymeric dispersant. QAcicnn / zznz / E / YiAi Due to the improved stabilization effect, the whitening agent described herein allows to efficiently incorporate pigment particles of very small average size (for example equal to or less than 400 nm expressed as a z-average size) and which has a low tendency to agglomerate, in a polymerizable composition based on allyl. The bleaching agent is particularly effective in correcting the yellow color caused by the relatively high concentration of the UV absorber, while maintaining the total light transmittance (T%) and haze of the cured polymer material at good levels. These improvements are obtained without substantially affecting other optical properties of the lenses, such as refractive index and Abbe number. Additionally, since the whitening effect is obtained using pigments instead of dyes, peroxide free radical polymerization initiators can be advantageously used to cure the polymerizable composition, thereby obtaining a cured polymer material that exhibits excellent mechanical properties, such as hardness, resistance to impacts and resistance to abrasion. With the present invention, therefore, optical articles that have excellent mechanical and optical properties and that are transparent, colorless and cut off HEV light in the wavelength range 400 to 420 nm, in addition to blocking substantially all wavelengths of UV wave (i.e., total transmittance T is 1% or less for wavelengths of 400nm or less), can be easily manufactured. Furthermore, as will be described in details below, the whitening agents containing a stable dispersion of pigment particles according to the present description can be prepared in a very easy and effective manner by direct sound wave application or a homogenization treatment. high pressure. The improved level of dispersibility of the pigment dispersion, measured for example by the polydispersity index (PDI), also makes it possible to at least overcome or at least reduce the disadvantages connected to the cake effect. Furthermore, the high level of pigment dispersion prevents the pigment particles from being retained by the filters normally used to purify the polymerizable composition before pouring, thus increasing the effectiveness of the whitening agent with a cost saving. Without wishing to be limited by theory, it is believed that the improved stability of the bleaching agent results from the aromaticity of its polymerizable allyl-based component, which increases the affinity of the dispersion phase technique towards the dispersed pigment particles. . Therefore, according to a first aspect, the present invention relates to a whitening agent comprising: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a colorant component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component QAacnn / zznz / E / YiAi (B) in the polymerizable component (A), where the particles of the dye component (B) have a z-average size equal to or less than 400 nm, measured by the Dynamic Light Scattering technique of according to the ISO 22412:2017 method. According to a second aspect, the present invention relates to a process for preparing the above whitening agent comprising the following steps in sequence: - provide a premix when mixing: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a colorant component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A); - homogenize the previous mixture to obtain a bleaching agent in which the particles of the coloring component (B) have an average size z equal to or less than 400 nm, measured by the Dynamic Light Scattering technique in accordance with the ISO 22412 method: 2017. According to a third aspect, the present invention relates to a polymerizable composition for an optical material comprising: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a coloring component comprising particles of a blue pigment (b1); (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A); (D) an ultraviolet absorption agent; and (E) a radical polymerization initiator, wherein the particles of the dye component (B) have a z-average size equal to or less than 400 nm, measured by the Dynamic Light Scattering technique in accordance with the ISO 22412 method: 2017, and the polymeric dispersing agent (C) comprises a polymeric part and one or more pigment affinity groups selected from: carboxylic group, sulfate group, sulfonate group, amine salts, phosphate group, phosphonate group, carbamate group, group urea, amide group or amine group. According to a fourth aspect, the present invention relates to a process for preparing a polymerizable composition for an optical material comprising the following steps in sequence: - providing a bleaching agent according to the process for preparing the above bleaching agent, - mixing the bleaching agent with (AA) a polymerizable component comprising a compound that includes two or more allyloxycarbonyl groups and (D) an ultraviolet absorption agent and (E) a radical polymerization initiator. QAacnn / zznz / E / YiAi According to other aspects, the present invention relates to a molded article obtained by curing the polymerizable composition defined above as well as an optical material and a plastic lens comprising the molded article. According to a further aspect, the present invention relates to a method for manufacturing a plastic lens comprising the following steps in sequence: i) providing a polymerizable composition for an optical material according to the present invention as defined above; II) pour the polymerizable composition into a mold; iii) curing the polymerizable composition to obtain a plastic lens. Additional features of the present invention are illustrated in the dependent claims annexed to the present description. The compositions of the present invention may comprise, consist essentially of, or consist of, the essential components as well as optical ingredients described herein. As used herein, “consisting essentially of” means that the composition or component may include additional ingredients that do not materially alter the basic and novel characteristics of the claimed compositions or methods. As used herein, the articles “a”, “one” and “the” should be read to include one at least one and the singular also includes the plural, unless it is obvious that it means otherwise. manner. This is done simply for convenience and to give a general sense of the description. Different from the examples of operation, or where otherwise indicated, all numbers that express quantities of ingredients, reaction conditions, etc., in the specification and claims will be understood as modified in all cases by the term " about". As used herein, the values ​​of “z-average particle size” and “polydispersity index” mean that it is determined by Dynamic Light Scattering technique according to the ISO 22412:2017 method. The z-average particle size is the intensity-weighted mean diameter derived from the cumulative analysis as described in ISO 22412:2017. As used herein, the terms used to identify colored pigments, such as blue pigment, red pigment, yellow pigment, violet pigment, pink pigment, green pigment, black pigment, white pigment and the like, refer to the index classification of Color published by Society of Dyers and Colourists, American Association of Textile Chemists and Colourists. The terms “cutoff ratio” of light and “cutoff ratio” as used interchangeably; represent the transmissive value, at a given wavelength WL (e.g. WL = 400 nm, 405 nm, 410 nm), measured on an article molded in the form of a flat plate having a thickness of 2 mm, if not otherwise specified, and expressed as a percentage according to the following formula: Cutoff ratio(WL)% = 100(%) - Transmittance (%) in the WL. The cutoff (light) wavelength is understood as the highest wavelength below which the light transmission becomes lower than 1%. QAacnn / zznz / E / YiAi Best way to carry out the Invention A description of the bleaching agent according to the present invention, its preparation process and its use for bleaching polymerizable compositions for optical materials will be given through the following embodiments. As stated above, the whitening agent according to the present invention comprises: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a colorant component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A), the particles of the coloring component (B) having an average size equal to or less than 400 nm; The above weight percentages are referred to the weight of component (A). Each component of the whitening agent composition will be described below. (A) Polymerizable compound comprising an aromatic ester compound including two or more allyloxycarbonyl groups The polymerizable component (A) comprises an aromatic ester compound that includes two or more allyloxycarbonyl groups. In one embodiment, it is possible to represent this a compound including two or more allyloxycarbonyl groups by the following formula (1) QAcicnn / zznz / E / YiAi where, in the formula, n is an integer from 2 to 6, Fh indicates a hydrogen atom or a methyl group, a plurality of R / s present may be the same or different, X is a divalent to hexavalent organic group derived from an aromatic compound having 6 to 12 carbon atoms. Specific examples of the aromatic ester compound (A) that includes two or more allyloxycarbonyl groups include a polymerizable allyl ester compound (A2), and a polymerizable compound (A3) that includes at least one allyl ester group and optionally at least one group allyl carbonate. It is possible for the aromatic ester compound to include two or more allyloxycarbonyl groups to include an oligomer thereof. An aromatic ester compound including two or more allyloxycarbonyl groups is a liquid product at room temperature, the viscosity measured at 25°C is 10 to 1000 cSt, and it is possible to change the oligomer content in a wide range, e.g. 0 to about 80% by weight. Allyl Ester Polymerizable Compound (A2), Polymerizable Compound (A3) Specific examples of the allyl ester polymerizable compound (A2) include diallyl phthalate represented by General Formula (3) and oligomers thereof, and allyl ester compounds represented by General Formula (4) and oligomers thereof obtained by transesterification reaction of a mixture of diallyl phthalate and a polyol. Examples of the polymerizable compound (A3) include a polymerizable compound represented by General Formula (5) that includes at least one allyl ester group and at least one allyl carbonate group and oligomers thereof. The polymerizable compound represented by General Formula (5) includes a mixture of an allyl ester compound, an allyl carbonate compound, and compounds having an allyl ester group and an allyl carbonate group, obtained by reaction of transesterification of a mixture of dialkyl phthalate, allyl alcohol, diallyl carbonate, and a polyol. In the present embodiment, the compounds of General Formulas (3) to (5) include regioisomers. QAacnn / zznz / E / YiAi The diallyl phthalate represented by General Formula (3) is at least one class selected from diallyl isophthalate, diallyl terephthalate, and diallyl orthophthalate. (4) In Formula (4), carbon and having 3 to 6 hydroxyl groups, and n is an integer from 2 to 6. In Formula (5), carbon and having 3 to 6 hydroxyl groups, m and n represent integers from 0 to 6, and the sum of m and n is an integer from 2 to 6. In one embodiment, the polymerizable component is a compound or a mixture of compounds selected from those having the following Formulas (3) to (5) and mixtures thereof, provided that none of the compounds of the Formulas (3) and (4) are present, in Formula (5) n represents integers from 1 to 6 and the sum of m and n is an integer from 2 to 6. The polymer component (A) may also include an aliphatic compound that includes two or more allyloxycarbonyl groups, such as the compound of Formula (5) above where in Formula (5) n = 0. Preferably, the amount total of the aliphatic compound is equal to or less than 30% by weight referred to the weight of the polymer component (A). In one embodiment, the polymerizable component is a mixture comprising: - at least one allyl ester compound of Formulas (3) or (4), and / or a compound having an allyl ester group and an allyl carbonate group of Formula (5); - at least one allyl carbonate compound of the formula (II) QAacnn / zznz / E / YiAi L -in (n) where, in formula (II), n is equal to or greater than 1 and equal to or less than 10. Specific examples of the polyol-forming ,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl-1,5pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1, 3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, and 1,4dimethylolcyclohexane; glycerol and trimethylolpropane triols; and polyols of tris(hydroxyethyl) isocyanurate, pentaerythritol, diglycerol, ditrimethylol propane, and dipentaerythritol. It is possible for the compounds of Formula (4) and Formula (5) to include oligomers thereof. The oligomer in Formula (4) is produced by the transesterification reaction of an allyl ester compound produced in a production step and a polyol. The oligomer in Formula (5) is produced by transesterification reaction of the allyl ester compound or an allyl carbonate compound produced in the production step and the polyol. Accordingly, the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) includes at least one class selected from, for example, a diallyl phthalate compound selected from diallyl isophthalate, diallyl terephthalate, and diallyl orthophthalate. diallyl; diallyl ester compounds and oligomers thereof obtained by transesterification reaction between the diallyl phthalate compound and a mixture of at least one kind of diol selected from ethylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanodyl, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,4-dimethylolcyclohexane, and the like; a pollolyl ester compound and an oligomer thereof obtained by transesterification reaction between diallyl phthalate and a mixture of at least one kind of polyol selected from glycerol triol and trimethylolpropane, tris(hydroxyethyl) isocyanurate, pentaerythritol, diglycerol, ditrimethylol propane, dipentaerythritol, and the like; and an allyl ester compound, an allyl carbonate compound, a compound having an allyl carbonate group and an allyl ester group, and oligomers thereof, obtained by transesterification reaction of a mixture of at least one kind of dialkyl phthalate having 1 to 3 carbon atoms selected from dimethyl isophthalate, dimethyl terephthalate, dimethyl orthophthalate, diethyl isophthalate, diethyl terephthalate, diethyl orthophthalate, dipropyl isophthalate, dipropyl terephthalate, and dipropyl orthophthalate, an allyl alcohol, diallyl carbonate, and the diol or polyol described above. More specifically, the ayl ester polymerizable compound (A2) or the polymerizable compound (A3) preferably includes at least one class selected from: (i) a mixture of diallyl terephthalate and a diethylene glycol bis compound (alyl carbonate ) at 30% by weight with respect to diallyl terephthalate and an oligomer thereof; (i) an ayl ester compound obtained by transesterification reaction of a mixture of diallyl terephthalate and propylene glycol; (iii) a mixture of the allyl ester compound of (i) and a diethylene glycol bis(allyl carbonate) compound at 20% by weight with respect to the allyl ester compound and an oligomer thereof; (iv) a mixture of an allyl ester compound, an allyl carbonate compound, and a compound having an allyl ester group and an allyl carbonate group, obtained by transesterification reaction of a mixture of dimethyl terephthalate, alcohol allyl, diallyl carbonate, and diethylene glycol, and (v) a mixture of the mixture obtained in (iv) and a diethylene glycol bis(allyl carbonate) compound at 10% by weight with respect to the mixture and an oligomer thereof . The following are preferable examples of the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) suitable for the purposes of the present invention: a mixture of an allyl ester compound, an allyl carbonate compound, and a compound having an allyl ester group and an allyl carbonate group, obtained by transesterification reaction of a mixture of dimethyl terephthalate, allyl alcohol, diallyl carbonate, and diethylene glycol. It is possible for the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) described above to be defined by Formulas (III) and (V), the diallyl terephthalate of Formula (III) is the main component thereof, and each one includes an oligomer obtained by transesterification reaction with a polyol. The allyl ester polymerizable compound (A2) or the polymerizable compound (A3) described above may also include a compound of Formula (IV). According to the present invention, it is possible to select an aromatic ester compound (A) that includes two or more allyloxycarbonyl groups as a mixture of the polymerizable allyl ester compound (A2) and / or the polymerizable compound (A3) and oligomers of the same with the polymerizable compound allyl carbonate (A1) and an oligomer thereof. (B) - Coloring component According to the present invention, the whitening agent comprises a coloring component (B) comprising at least particles of a blue pigment (b1). According to the present invention, the blue pigment incorporated in the optical material functions to achromatize the initial coloration and prevent yellowing, in particular the yellowing caused by the UV absorbing compound, thus improving the lack of color and transparency of the product. cured. The blue pigment is preferably a pigment that is not degraded by a radical initiator used as a curing agent for the polymerizable composition. The blue pigment can be selected, for example, from: ultramarine, which is composed of sulfur-containing sodium aluminosilicate; Prussian blue, which is composed primarily of ferric ferrocyanide; cobalt blue, which is composed of cobalt oxide and alumina; phthalocyanine blue, which is composed of copper phthalocyanine; and mixture thereof. Among these examples, ultramarine is particularly preferred for its low tendency to decompose when organic peroxide radical initiators are used as a curing agent. Ultramarine has cobalt and violet colors. Ultramarine pigments are sodium aluminum silicates of the sodalite structure containing sulfur species. Sodalite of the formula Na6(AI6S¡6024) is formed from juxtaposed sodalite cages (truncated cubehedrals). The chromophores of ultramarine pigment are polysulfide radicals S3(blue) and S2(yellow). These chromophores are housed in the sodalite cages in the salt forms NaS3 and NaS2. The tone of the pigments is related to the concentration of these chromophores. The whitening agent may optionally contain pigments other than the blue pigment in order to adjust the color tones in the final product. The type and content of the other pigments can be appropriately selected depending on the purpose. In a preferred embodiment, the coloring component (B) includes particles of one or more additional pigments (b2) other than the blue pigment (b1). Preferably, the one or more pigments (b2) are selected from organic pigments, preferably azo pigments. More preferably the pigment (b2) is selected from: quinacridone red (e.g. Hostaperm Pink E by Clariant Produkte, Germany), perylene red, pigment red based on pyrrolo[3,4-c]pyrrole compounds (e.g. Hostaperm Red D3G70 by and Clariant Produkte, Germany), dioxazine violet and mixtures thereof. The pigment particles of the coloring component (B) suspended in the bleaching agent or polymerizable composition have a z-average size equal to or less than 300 nanometers (nm), preferably equal to or less than 280 nm, more preferably equal to or less 250 nm, even more preferably equal to or less than 200 nm. Preferably, the pigment particles suspended in the bleaching agent or polymerizable composition have a z-average size equal to or greater than 20 nm, more preferably equal to or greater than 50 nm, even more preferably equal to or greater than 100 nm. . The pigment particles can also have an average size z in any range which is a QAacnn / zznz / E / YiAi combination of any of the z-average size values ​​above. Preferably, the whitening agent composition comprises pigment particles in a total amount within the range of 0.1% to 5.0% by weight, more preferably 1.0% to 3.0% by weight, even more preferably 1.5% at 3% by weight, based on the weight of the polymerizable component (A) of the bleaching agent composition. Preferably, the blue pigment particles (b1) are present in the coloring component (B) in an amount within the range of 1% to 4% by weight, preferably 1.5% to 2.5%, based on weight. of the polymerizable component (A) of the whitening agent composition. Preferably, the weight ratio of the pigment particles (b1) and the pigment particles (b2) in the bleaching agent and the polymerizable composition is within the range 5:1, more preferably 15:1. Preferably, the whitening agent is added to the polymerizable composition in such an amount that the total amount of pigment particles of the pigmentation component (B) in the polymerizable composition is within the range of 0.1 ppm to 300 ppm by weight, so more preferably from 1.0 ppm to 200 ppm by weight, based on the total weight of the polymerizable component of the polymerizable composition. As used herein, unless explicitly stated otherwise or obviously intended otherwise, the term “total weight of the polymerizable component of the polymerizable composition” means the total amount of the polymerizable component (AA) introduced in the polymerizable composition as a monomer or oligomer and the polymerizable component (A) forming the bleaching agent or possibly used as a vehicle to introduce any other ingredient into the polymerizable composition that is emptied (for example radical polymerization initiators, UV absorbers , etc.). Preferably, the whitening agent is added to the polymerizable composition in such an amount that the blue pigment particles (b1) of component (B) are present in an amount within the range of 0.05 ppm to 250 ppm by weight, preferably from 1.0 ppm to 180 ppm, based on the weight of the polymerizable component of the polymerizable composition. (C) Polymeric dispersing agents The polymerizable composition according to the present invention contains at least one polymeric dispersing agent to assist the dispersion of the pigment particles in the polymerizable component (A), thus preventing their flocculation, aggregation and sedimentation in the whitening agent and in the polymerizable composition in which the whitening agent is incorporated. Typically, polymeric dispersing agents comprise a polymer moiety and one or more related pigment groups. Frequently, dispersants are constructed as comb polymers having one or more polymer chains and one or more related pigment groups. In general, a polymeric dispersant with a single polymer chain has a cognate pigment group at a terminal position. Other types of polymeric dispersants may have a backbone with related pigment groups and have polymeric tails that are soluble in the polymer into which they are incorporated. QAacnn / zznz / E / YiAi In general, related pigment groups are groups with high polarity, for example ionic groups, such as carboxylic groups, sulfate, sulfonate, amine salts, phosphate or phosphonates. Nonionic groups, such as carbamate, urea, amide or amine group, may also be suitable cognate pigment groups. The polymeric part can be selected from: copolymers of vinyl or amine monomers with carboxylic acid monomers (for example acrylic acids), copolymers of carboxylic acid monomers and amide monomers, such as poly(acrylic acid-co-acrylamide) and / or you leave them. A preferred polymeric dispersing agent is poly(acrylic acid-co-acrylamide) and salts thereof (PAA-PAM), which preferably has a molar ratio of acrylic acid to acrylamide monomer of 60:40, and a Mw of at least 50,000 g / mol, more preferably at least 200,000 g / mol. Another preferred polymeric dispersing agent is a polymer, preferably a poly(acrylic acid-co-acrylamide), carrying amine and carboxylic acid functional groups, such as the polymeric dispersing agent sold under the trade name DISPERBYK 191 (BYK- Chemie GmbH; Wesel, Germany), and which reportedly has an acid number of 30 mg KOH / g (ASTM D974) and an amine value of 20 mg KOH / g (ASTM D2073-92). The polymeric dispersing agent (C) is different from the polymerizable component (A) of the bleaching agent, that is, the polymeric dispersing agent (C) excludes from its definition any compound that is used as a polymerizable component (A). Suitable dispersants are, for example, Disperbyk dispersants from Byk Chemie, Solsperse, Solplus and Ircosperse dispersants, available from Lubrizol Advanced Materials, Efka dispersants from Giba, Tego dispersants from Degussa, and Nuosperse dispersants from Elementis Specialies. In one embodiment, the dispersant is derived from an acrylic polymer and / or polycaprolactone, such as the commercial product SOLSPERSE 32500. An alternative suitable acrylic polymeric dispersant can be prepared from glycidyl methacrylate, n-butyl methacrylate. Nbutyl acrylate, and hydroxypropyl methacrylate. The above polymeric dispersing agents may be used alone, or two or more of these may be used as a mixture. The bleaching agent comprises the polymeric dispersing agent (C) in an amount within the range of 0.5% to 10.0% by weight, preferably 1.0% to 5.0%, even more preferably 1.0% to 3.0%, based in the weight of the polymerizable component (A) of the whitening agent. Preferably, the bleaching agent is added to the polymerizable composition in such an amount that the polymeric dispersing agent (C) in the polymerizable composition is within the range of 0.1 to 300 ppm by weight, preferably 1 to 200 ppm, based on the weight of the polymerizable component of the polymerizable composition. Polymerizable compositions (AA) Polymerizable compound that includes two or more allyloxycarbonyl groups. One aspect of the present invention relates to the polymerizable composition for a material. QAacnn / zznz / E / YiAi optical comprising: (AA) a polymerizable component comprising a compound that includes two or more allyloxycarbonyl groups; (BB) a bleaching agent according to the present description; (D) an ultraviolet absorption agent; (E) a radical polymerization initiator, preferably an organic peroxide radical polymerization initiator. The polymerizable component (AA) can be selected from a wide variety of polymerizable compounds, which may include monomers, oligomers and / or prepolymers, having at least two allyl groups as polymerizable functional groups. The polymerizable component (AA) may comprise, for example, polymer compounds containing two or more ethylenically unsaturated groups, such as diallyl ester, diallyl carbonate, diallyl phthalate, allyl (meth)acrylate, allyl meth(acrylate). vinyl. In one embodiment, it is possible to represent the polymerizable component (AA) by the following formula (1). QAcicnn / zznz / E / YiAi where, in the formula, n is an integer from 2 to 6, R i indicates a hydrogen atom or a methyl group, a plurality of R / s present may be the same or different, X is a divalent organic group to Hexavalent to derived from an aliphatic or linear or branched polyol that has 3 to 12 carbon atoms that can have an oxygen atom, an organic group divalent to Hexavalente derived from a alicyclic polyol that has 5 to 16 carbon atoms that an oxygen atom may have, or a divalent to hexavalent organic group derived from an aromatic compound having 6 to 12 carbon atoms, and the organic group a or the organic group b forms an allyl carbonate group by joining to an allyloxycarbonyl group through an oxygen atom derived from a hydroxyl group. These polyols typically include 2 to 6 hydroxyl groups in the molecule, and it is possible for these polyols to include 2 to 4 hydroxyl groups in the molecule, which is preferable. Examples of the aliphatic polyol a1 include diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, 1,3-propanediol, f,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, glycerol, trimethylolpropane, tris( hydroxyethyl) isocyanurate, pentaerythritol, dipentaerythritol, and the like. Examples of the alicyclic polyol b1 include 1,4-dimethylolcyclohexane, 4,8-bis(hydroxymethyl)-[5.2.1.02'6]triclodecane, and the like. Examples of the aromatic compound c1 include benzene, toluene, xylene, naphthalene, and the like. Specific examples of the compound that include two or more allyloxycarbonyl groups include an allyl carbonate polymerizable compound (A1), a polymerizable allyl ester compound (A2), and a polymerizable compound (A3) that includes at least one of an allyloxycarbonyl group. allyl and an allyl ester group. It is possible for compound (A) to include two or more allyloxycarbonyl groups to include an oligomer thereof. A compound including two or more allyloxycarbonyl groups is a liquid product at room temperature, the viscosity measured at 25°C is 10 to 1000 cSt, and it is possible to change the oligomer content in a wide range, for example, 0 to about 80% by weight. Allyl Carbonate Polymerizable Compound (A1) The polymerizable allyl carbonate compound (A1) can be represented by Formula (2) QAacnn / zznz / E / YiAi where, in Formula (2), X represents a divalent to hexavalent group derived from an aliphatic or linear or branched polyol having 3 to 12 carbon atoms or a divalent to hexavalent group derived from a alicyclic polyol having 5 to 16 carbon atoms, and n represents an integer from 2 to 6. The polymerizable compound allyl carbonate (A1) of Formula (II) may include an oligomer thereof. The oligomer is a poly(allyl carbonate) in which two or more molecules of a polyol are linked through a carbonate group produced by transesterification reaction of the allyl carbonate produced in the production step and a polyol. The polymerizable allyl carbonate compound is a poly(allyl carbonate) compound of a linear or branched aliphatic polyol having 3 to 12 carbon atoms. A poly(allyl carbonate) compound of an alicyclic polyol having 5 to 16 carbon atoms in the molecule is also suitable for this purpose. These polyols usually have 2 to 6 hydroxyl groups in the molecule and it is possible for these polyols to have 2 to 4 hydroxyl groups in the molecule, which is preferable. It is also possible to use a blended poly(allyl carbonate) compound, i.e. a compound that is derived from at least two kinds of polyols and that can be obtained by mechanical mixing of the respective poly(allyl carbonate) polyol compounds. , or a compound obtained directly by a chemical reaction starting from a mixture of polyols and diallyl carbonate. Finally, it is possible for all of these poly(allyl carbonate) compounds to be in the form of monomers or mixtures of monomers and oligomers. In general, the polymerizable allyl carbonate compound is a liquid product at room temperature, the viscosity measured at 25°C is 10 to 1000 cSt, and it is possible to change the oligomer content in a wide range, for example, 0 to about 80% by weight. Specific examples of the polyols that form methyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2diethyl-1,3-propanediol, 2,2,4-trim ethyl-1,3-pentanediol, 1,4 -dimethylolcyclohexane, 4,8-bis(hydroxy¡m ethyl)[5.2.1.02,6j tricyclodecane, glycerol, trimethylolpropane, tris(hydroxy¡ethyl) isocyanurate, pentaerythritol, diglycerol, ditrimethylolpropane, dipentaerythritol, and the like. Accordingly, examples of allyl carbonate compounds include at least one class selected of bis(allyl carbonate) compounds of at least one class of diol selected from diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2diethyl-1,3 -propanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,4-dimethylolcyclohexane, and 4,8-bis(hydroxymethyl)[5.2.1.02,6]tricyclodecane; tris(allyl carbonate) compounds of at least one kind of triol selected from glycerol, trimethylolpropane, and tris(hydroxyethyl isocyanurate); tetra(allyl carbonate) compounds of at least one kind of tetraol selected from pentaerythritol, diglycerol, and ditrimethylol propane; dipentaerythritol hexa (allyl carbonate) compounds; and a mixed poly(allyl carbonate) compound of at least two classes of compounds selected from diols, triols, tetraols, and dipentaerythritol. The “bis(allyl carbonate) of a mixture of at least two kinds of diols” is, for example, obtained as a mixture of the following monomer components and oligomer components in a case where the diols are diethylene glycol and neopentyl glycol: Monomer component: (1) diethylene glycol bis(allyl carbonate); (2) neopentyl glycol bis(allyl carbonate); Components of oligomers: (3) oligomer including only hydrocarbons (and ethers) derived from diethylene glycol (a compound having a structure in which two hydroxyl groups of a compound in which diethylene glycol is linearly oligomerized through a carbonate linkage are replaced with groups allyl carbonate); (4) oligomer including only hydrocarbons derived from neopentyl glycol (a compound having a structure in which two hydroxyl groups of a compound in which neopentyl glycol linearly oligomerizes through a carbonate linkage are replaced with allyl carbonate groups) ; (5) complex oligomer that includes both hydrocarbons (and ethers) derived from diethylene glycol and a hydrocarbon derived from neopentyl glycol in the same molecule (a compound that has a structure in which two hydroxyl groups of a compound in which the diethylene glycol and the Neopentyl glycol linearly oligomerize in an arbitrary sequence in the same molecule via a carbonate linkage (replaced with allyl carbonate groups). The following are preferable examples of the polymerizable allyl carbonate compound (A1) suitable for the purposes of the present invention: (i) Mixture with diethylene glycol bis(allyl carbonate) and oligomers thereof, wherein diethylene glycol bis(allyl carbonate) can be defined by Formula (I) QAacnn / zznz / E / YiAi QAacnn / zznz / E / YiAi Furthermore it is possible to define a diethylene glycol bis(aryl carbonate) oligomer by Formula (II). L(H) where, in formula (II), n is equal to one or more than 1 and equal to or less than 10. It is possible to manufacture compound (I) by reacting diethylene glycol bis(chloroformate) with allyl alcohol as described in, for example, "Encyclopedia of Chemical Technology", Kirk-Othmer, Third Edition, Volume 2, pages 111-112. It is possible to easily produce mixtures of bis(aryl carbonate) of diethylene glycol (Formula (I)) and an oligomer (Formula (II)) thereof by replacing it between diallyl carbonate and diethylene glycol in the presence of a basic catalyst, for example For example, as described in EP 35304. These mixtures usually include up to about 80% by weight of oligomers; (i) Mixture of the bis(allyl carbonate) compound of a mixture of diethylene glycol and neopentyl glycol with oligomers thereof. This bis(allyl carbonate) compound is the same as the bis(allyl carbonate) compound of point (i) above except that the diethylene glycol is replaced with a mixture of diethylene glycol and neopentyl glycol; (iii) Mixture of the poly(allyl carbonate) compound of a mixture of diethylene glycol and tris(hydroxyethyl) isocyanurate with oligomers thereof. It is possible to obtain the poly(allyl carbonate) compound by ester replacement of a diallyl carbonate from a mixture of diethylene glycol and tris(hydroxyethyl) isocyanurate, for example, as described in US 4,812,545. (iv) Mixture of the poly(allyl carbonate) compound of a mixture of diethylene glycol and trimethylolpropane with oligomers thereof. This poly(allyl carbonate) compound is the same as the poly(allyl carbonate) compound of point (i) above, except that the tris(hydroxyethyl) isocyanurate is replaced with trimethylol propane. (v) Mixture of the poly(allyl carbonate) compound of a mixture of diethylene glycol and pentaerythritol with oligomers thereof. This poly(allyl carbonate) compound is the same as the poly(allyl carbonate) compound of point (iii) above, except that the tris(hydroxyethyl) isocyanurate is replaced with pentaerythritol. (vi) Mixture of the poly(allyl carbonate) compound of a mixture of diethylene glycol, neopentyl glycol, and pentaerythritol with oligomers thereof. This poly(allyl carbonate) compound is the same as the poly(allyl carbonate) compound of point (v) above, except that the diethylene glycol is replaced with two kinds of diols of diethylene glycol and neopentyl glycol. (vii) Poly(allyl carbonate) mixture including a mixture of the poly(allyl carbonate) compound of a mixture of diethylene glycol, neopentyl glycol, and pentaerythritol with oligomers thereof and a mixture of bis(allyl carbonate) compound ) of diethylene glycol with oligomers thereof. Allyl Ester Polymerizable Compound (A2), Polymerizable Compound (A3) Examples of the polymerizable allyl ester compound (A2) include diallyl phthalate represented by General Formula (3) and oligomers thereof, and allyl ester compounds represented by General Formula (4) and oligomers thereof obtained by transesterification reaction of a mixture of diallyl phthalate and a polyol. Examples of the polymerizable compound (A3) include a polymerizable compound represented by General Formula (5) that includes at least one of an allyl ester group and an allyl carbonate group and oligomers thereof. The polymerizable compounds represented by General Formula (5) include a mixture of an allyl ester compound, an allyl carbonate compound, and compounds having an allyl ester group and an allyl carbonate group, obtained by reaction of transesterification of a mixture of dialkyl phthalate, allyl alcohol, diallyl carbonate, and a polyol. In the present embodiment, the compounds of General Formulas (3) to (5) include regioisomers. The diallyl phthalate represented by General Formula (3) is at least one class selected from diallyl isophthalate, diallyl terephthalate, and diallyl orthophthalate. In Formula (4), carbon and having 3 to 6 hydroxyl groups, and n is an integer from 2 to 6. (5) In Formula (5), carbon and having 3 to 6 hydroxyl groups, m and n represent integers from 0 to 6, and the sum of m and n is an integer from 2 to 6. Specific examples of the polyol (aliphatic diol, aliphatic polyol) forming , 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2-diet l-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, and 1,4-dimethylolcyclohexane; glycerol and trimethylolpropane triols; and polyols of tris(hydroxyethyl)isocyanurate, pentaerythritol, diglycerol, ditrimethylol propane, and dipentaerythritol. It is possible for compounds of Formula (4) and Formula (5) including oligomers thereof. The oligomer in Formula (4) is produced by transesterification reaction of an allyl ester compound produced in a production step and a polyol. The oligomer in Formula (5) is produced by transesterification reaction of the allyl ester compound or the allyl carbonate compound produced in the production step and the polyol. Accordingly, the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) includes at least one class selected from, for example, a diallyl phthalate compound selected from diallyl, diallyl terephthalate, and diallyl orthophthalate; diallyl ester compounds and oligomers thereof obtained by transesterification reaction between the diallyl phthalate compound and a mixture of at least one kind of diol selected from ethylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 2, 2-diethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, 1,4-dimethylolcyclohexane, and the like; a polyallyl ester compound and an oligomer thereof obtained by transesterification reaction between diallyl phthalate and a mixture of at least one kind of polyol selected from glycerol and trimethylolpropane triols, tris(hydroxyethyl) isocyanurate, pentaerythritol, diglycerol, ditrimethylol propane, dipentaerythritol, and the like; and an allyl ester compound, an allyl carbonate compound, a compound having an allyl carbonate group and an allyl ester group, and oligomers thereof, obtained by transesterification reaction of a mixture of at least one kind of dialkyl phthalate having 1 to 3 carbon atoms selected from dimethyl isophthalate, dimethyl terephthalate, dimethyl orthophthalate, diethyl isophthalate, diethyl terephthalate, diethyl orthophthalate, dipropyl isophthalate, dipropyl terephthalate, and dipropyl orthophthalate, an allyl alcohol, diallyl carbonate, and the diol or polyol described above. More specifically, the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) preferably includes at least one class selected from (i) a mixture of diallyl terephthalate and a bis (allyl carbonate) compound diethylene glycol at 30% by weight with respect to diallyl terephthalate and an oligomer thereof; (i) an allyl ester compound obtained by transesterification reaction of a mixture of diallyl terephthalate and propylene glycol; (iii) a mixture of the allyl ester compound of (ii) and a diethylene glycol bis(allyl carbonate) compound at 20% by weight with respect to the allyl ester compound and an oligomer thereof; (iv) a mixture of an allyl ester compound, an allyl carbonate compound, and a compound having an allyl ester group and an allyl carbonate group, obtained by transesterification reaction of a mixture of dimethyl terephthalate, alcohol allyl, diallyl carbonate, and diethylene glycol, and (v) a mixture of the mixture QAacnn / zznz / E / YiAi obtained in (v) and a diethylene glycol bis (allyl carbonate) compound at 10% by weight with respect to the mixture and an oligomer thereof. The following are preferred examples of the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) suitable for the purposes of the present invention: a mixture of an allyl ester compound, an allyl carbonate compound, and a compound having an allyl ester group and an allyl carbonate group, obtained by transesterification reaction of a mixture of dimethyl terephthalate, allyl alcohol, diallyl carbonate, and diethylene glycol. It is possible for the allyl ester polymerizable compound (A2) or the polymerizable compound (A3) described above to be defined by Formulas (III) to (V), the diallyl terephthalate of Formula (III) is the main component thereof, and each one includes an oligomer obtained by transesterification reaction with a polyol. QAcicnn / zznz / E / YiAi (IV) According to the present invention, it is possible to select the compound (A) including two or more allyloxycarbonyl groups as a mixture of the allyl ester polymerizable compound (A2) and / or the polymerizable compound (A3) and oligomers thereof with the polymerizable allyl carbonate compound (A1) and an oligomer thereof. (D) Ultraviolet absorption agent (UV absorber) Preferably the UV absorption agent is a compound represented by General Formula (i): wherein, R 1 indicates a hydrogen atom, or a linear or branched alkyl group having 1 to 20 carbon atoms, a plurality of R / s present may be the same or different; m is an integer from 1 to 5, preferably an integer from 1 to 3, n is an integer from 1 to 5, preferably an integer from 1 to 3, and the sum of m and n is an integer 2 to 10, preferably an integer from 3 to 6. In Formula (i), R is preferably a linear or branched alkyl group having 1 to 20 carbon atoms such as a hydrogen atom, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a 2-ethyl-hexyl group, a nonyl group, and a said, and particularly preferably a hydrogen atom, a methyl group, an ethyl group, and a propyl group. Examples of this ultraviolet absorption agent (B) include: 2,2',4-trihydroxybenzophenone, 2,2'dlhldroxl-4-methoxybenzophenone, 2,2'-dihydroxy-4-ethoxybenzophenone, 2,2'-dihydroxl -4-n-propoxybenzophenone, 2,2'-dihydroxy-4-isopropoxybenzophenone, 2,2'-dihydroxy-4-n-butoxybenzophenone, 2,2'-dihydroxy-4-tbutoxybenzophenone, 2-hydroxy-4, 4'-dimethoxybenzophenone, 2-hydroxy-4,4'-diethoxy¡benzophenone, 2-hydroxy¡-4,4' QAacnn / zznz / E / YiAi di-n-propoxybenzophenone, 2-hydroxy-4,4'-diisopropoxybenzophenone, 2-hydroxy-4,4'-di-n-butoxybenzophenone, 2-hydroxy-4,4'- di-t-butoxybenzophenone, 2-hydroxy-4-methoxy-4'-ethoxybenzophenone, 2-hydroxy-4-methoxy-4'-n propoxybenzophenone, 2-hydroxy-4-methoxy-4'-isopropoxybenzophenone, 2-hydroxy- 4-methoxy-4'-nbutoxybenzophenone, 2-hydroxy-4-methoxy¡-4'-t-butoxybenzophenone, 2-hydroxy-4-ethoxy-4'-methoxybenzophenone, 2hydroxy-4-ethoxy-n-propoxybenzophenone, 2-hydroxy-4-ethoxy-4'-isopropoxybenzophenone, 2-hydroxy-4-ethoxy-4'-nbutoxybenzophenone, 2-hydroxy-4-ethoxy-4'-t-butoxybenzophenone, 2-hydroxy-4-n -propoxy-4'-methoxybenzophenone, 2-hydroxy-4-n-propoxy-4'-ethoxybenzophenone, 2-hydroxy-4-n-propoxy-4'-isopropoxybenzophenone, 2-hydroxy-4-npropoxy-4' -n-butoxybenzophenone, 2-hydroxy-4-n-propoxy-4'-t-butoxybenzophenone, 2-hydroxy-4-isopropoxy-4'methoxybenzophenone, 2-hydroxy-4-isopropoxy-4'-ethoxybenzophenone, 2-hydroxy-4-isopropoxy-4'-npropoxybenzophenone, 2-hydroxy-4-isopropoxy-4'-n-butoxybenzophenone, 2-hydroxy-isopropoxy-4'-tbutoxybenzophenone, 2-hydroxy-4-n-butoxy-4 '-methoxybenzophenone, 2-hydroxy-4-n-butoxy-4'-ethoxybenzophenone, 2-hydroxy¡-4-n-butoxy-4'-n-propoxybenzophenone, 2-hydroxy¡-4-n-butoxy-4'-isopropoxy¡benzophenone, 2-hydroxy¡-4n-butoxy-4'-t- butoxybenzophenone, 2-hydroxy¡-4-t-butoxy¡-4'-methoxybenzophenone, 2-hydroxy-4-t-butoxy¡-4'ethoxybenzophenone, 2-hydroxy¡-4-t-butoxy¡-4'-n -propoxybenzophenone, 2-hydroxy-4-t-butoxy¡-4'isopropoxybenzophenone, 2-hydroxy¡-4-t-butox¡-4'-n-butoxy¡benzophenone, 2,2',4,4'-tetrahydroxybenzophenone , 2,2'-dihydrox¡-4,4'-dimethoxybenzophenone, 2,2'-dihydrox¡-4,4'-diethoxy¡benzophenone, 2,2'-dihydrox¡-4,4 '-d¡-n propoxybenzophenone, butoxybenzophenone, 2,2'-dihydroxy-4,4'-di-isopropoxybenzophenone, 2,2'-dihydroxy-4,4'-di-t-butoxybenzophenone, 2,2'-dihydrox¡-4,4'-d¡-n2,2'-dihydroxy-4-methoxy-4'diethoxybenzophenone, isopropoxybenzophenone, butoxybenzophenone, isopropoxybenzophenone, 2,2'-dihydroxy-4-methoxy¡-4'-n-propoxybenzophenone, 2,2'-dihydroxy-4-methoxy-4'-n-butoxybenzophenone, 2,2'-dihydroxy-4-ethoxy-4'-n-propoxybenzophenone, 2,2'-dihydroxy-4-ethoxy-4'-n-butoxybenzophenone, 2,2'-dihydroxy-4-methoxy-4'2,2'-dihydroxy-4-methoxy-4'-t2,2'-dihydroxy-4-ethoxy-4'2,2'-dihydroxy -4-ethoxy-4'-tbutoxybenzophenone, 2,2'-dihydroxy-4-n-propoxy-4'-isopropoxybenzophenone, butoxybenzophenone, butoxybenzophenone, butoxybenzophenone, propoxybenzophenone, triethoxybenzophenone, trimethoxybenzophenone, 2,2'-dihydroxy-4-n-propoxy-4'-t-butoxybenzophenone, 2,2'-dihydrox¡-4-isopropoxy-4'-t-butoxybenzophenone, 2,2',4-trimethoxybenzophenone, 2,2',4-triisopropoxybenzophenone, 2,2',5-tri-n-propoxybenzophenone, 2,4,4'-triethoxybenzophenone, triisopropoxybenzophenone, 3,4',5-trimethoxybenzophenone, 2,2'-dihydroxy-4-n-propoxy-4'-n2,2'-dihydrox¡-4-ísopropoxy¡-4'-n2,2'-dihydroxy-4-n-butoxy-4'-t2 ,2',4-triethoxybenzophenone, 2,2',5-trimethoxybenzophenone, 2,2',5-triisopropoxybenzophenone, 2,4,4'-tri-n-propoxybenzophenone, 3,4',5-triethoxybenzophenone, 2,2',4-tri-n2,2',52,4,4'2,4,4'3,4',5-tri-n23 propoxybenzophenone, 3,4',5-trüsopropoxybenzophenone, 2,4 -dimethoxy-4'-hydroxybenzophenone, 2,4-diethoxy¡-4'hydroxybenzophenone, 2,4-di-n-propoxy-4'-hydroxy¡benzophenone, 2,4-di¡sopropoxy¡-4'- hydroxybenzophenone, 2,2',4,4'-tetramethoxybenzophenone, 2,2',4,4'-tetraethoxybenzophenone, 3,3',4,4'-tetramethoxybenzophenone, 3,3',4,4'-tetraethoxybenzophenone , 2,3,3',4'-tetramethoxybenzophenone, 2,3,3',4'-tetraethoxybenzophenone, and the like. Among these, 2,2'-dihydrox¡-4-methoxy¡benzophenone, 2,2'-dihydroxy-4,4'-dimethoxy¡benzophenone, and 2,2',4,4'-tetrahydroxybenzophenone are particularly preferable. It is possible to use the ultraviolet absorption agent (D) in an amount of 0.05% to 5% by weight, preferably 0.5% to 3% by weight, with respect to the total weight of the polymerizable component (AA) of the polymerizable composition. Within this range, it is possible to more effectively show the effect of light blocking between harmful ultraviolet light and blue light around 420 nm. Radical Polymerization Initiator of Compound (E) According to the present invention, the polymerizable composition includes at least one radical polymerization initiator for either thermal or photoinitiation. Preferably, the radical initiator is an organic peroxide compound. The radical initiator is preferably selected from: - peroxymonocarbonate esters (for example tere-butyl peroxyisopropyl carbonate); - peroxydicarbonate esters (for example di(2-ethylhexyl) peroxydicarbonate, cyclohexyl peroxydicarbonate, di(cyclohexyl peroxydicarbonate), di(sec-butyl) peroxydicarbonate and diisopropyl peroxydicarbonate, - diacylperoxides (for example 2,4-dichlorobenzoyl peroxide, isobutyryl peroxide, decanoyl peroxide, lauroyl peroxide, propionyl peroxide, acetyl peroxide, benzoyl peroxide, p-chlorobenzoyl peroxide); - peroxyesters (for example t-butylperoxy pivalate, t-butylperoxy octylate and t-butylperoxy butyrate); and mixtures thereof. The initiator is more preferably selected from: peroxymonocarbonate esters, peroxydicarbonate esters, diacyl peroxides and mixtures thereof. Preferred peroxymonocarbonate esters and peroxy-dicarbonate esters are those having the following formulas (F1) and (F2) EITHER II Rl—O-O—c —O—R2(Fl) Oo IIII Rl—O-C —O—O—C —O—R2 (F2) where Ri and R2, the same or different, are selected from: C1-C20 alkyl, Cr C2o alkenyl or CrC cycloalkyl^. Ri and R2 preferably have 2 to 16 carbon atoms, so QAacnn / zznz / E / YiAi more preferably 3 to 7 carbon atoms. FL and R2 may be linear or branched, and possibly substituted (for example with at least one halogen atom (for example C1 or Br) or a NO2 group). Examples of Ri and R2 groups are: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, and hexyl. The use amount of the radical polymerization initiator (E) varies depending on the polymerization conditions, the kind of initiator, the purity of the initiator, the diluent used, and the composition of the compound (A) and is not generally limited; However, the amount to be used is 0.1% to 5.0% by weight, preferably 0.5% to 3.5% by weight, with respect to the total weight of the polymerizable component (A) of the polymerizable composition and it is also possible to use a combination of two or more kinds of radical polymerization initiator. In one embodiment, the radical polymerization initiator is used in the form of a masterbatch composition, i.e. it is pre-dispersed in a polymerizable monomer such as any of the ayl-based polymerizable compounds of or component (A). comprising two allyloxy groups described in the present description, before being incorporated into the polymerizable composition. Furthermore, when the polymerizable composition for an optical material of the present embodiment is polymerized, among the polymerization conditions, the temperature particularly affects the properties of the cured product obtained. Since this temperature condition is influenced by the type and amount of the radical polymerization initiator (E) and the type of monomer (i.e. the polymerizable component (A)), it is generally not possible to limit the condition; However, in general, it is preferable that the polymerization is started at a relatively low temperature, that the temperature is raised slowly, and that the curing is carried out at a high temperature when the polymerization is completed. Since the polymerization time also varies depending on various factors in the same way as temperature, the optimal time is appropriately determined in advance according to these conditions, but it is generally preferable that you choose the conditions such that the polymerization is completed in 12 to 24 hours. Furthermore, the polymerizable composition for an optical material of the present embodiment has a high performance range since it does not require strict control at 35°C or lower and is curable even at a starting pattern of 60°C or higher. high. Other components The bleaching agent and the polymerizable composition may also include additional additive compounds such as an internal release agent, a resin modifier (for example, a chain extender, a cross-linking agent, a light stabilizer), an antioxidant, filler, adhesion improver, and the like. As the internal release agent, for example, it is possible to use an acid phosphate ester or a non-reactive silicone oil. Examples of acidic phosphate esters include phosphoric monoesters and phosphoric diesters and it is possible to use the former alone or in a mixture of two or more kinds. Examples of resin modifiers include an olefin compound including an episulfide compound, an alcohol compound, an amine compound, an epoxy compound, an acid Organic QAacnn / zznz / E / YiAi and an anhydride thereof, a (meth)acrylate compound, and the like. Use of whitening agent The amount of the whitening agent composition that is added to the polymerizable composition depends on the desired cut-off value for the molded product, and thus on the concentration of the UV absorber in the polymerizable composition. The bleaching agent composition is preferably added to the polymerizable composition in an amount within the range of 0.01% to 5.0% by weight, more preferably 0.02% to 1.5% by weight, based on the weight of the polymerizable component ( A) of the polymerizable composition (which does not include the amount of polymerizable component (A) of the whitening agent). Method for producing the bleaching agent In one embodiment, the preparation of the whitening agent includes at least one step of mixing the component (A), the pigment particles of the coloring component (B) and the polymeric dispersing agent (C) to obtain a liquid premix, followed by a step of homogenizing the premix to obtain a whitening agent wherein the dispersed pigment particles (b1) and optionally (b2) have an average particle size equal to or less than 400 nm. In the preparation of the whitening agent, the premix homogenization step allows achieving either or both of: (a) reduction in the size of the average pigment particles; (b) a more uniform distribution of the pigment particle size within the polymer component (A), particularly a relatively narrow distribution of the pigment particle size around its average value. Homogenization can be achieved by the action of shear forces, which can be applied to the premix by a variety of techniques, such as: mechanical agitation; by forcing the premix to flow at a very high velocity through a reduced passage; applying shear forces to the premix between two surfaces that move relative to each other or by ultrasonic vibrations. In a preferred embodiment, homogenization is achieved using a high pressure homogenizer. High pressure homogenization (HPH) is a grinding technique that allows solid particles dispersed in a fluid to be crushed. HPH is widely used in a variety of technical fields, such as food industry and biotechnology, for example for the production of fine emulsions or the alteration of microorganisms, targeting either their inactivation or the release of intracellular products. A high-pressure homogenizer works by forcing the suspension to be homogenized, that is, the premix containing the pigment particles, through a very narrow channel or orifice under pressure. In general, the suitable homogenizer comprises a high pressure pump and a homogenization head. The pump may be a positive displacement (piston) reciprocating pump. The high pressure applied is preferably a pressure within the range of 20 to 70 MPa. The homogenizing head may house a reduced gap assembly (homogenizing valve) which may come in different shapes, depending on the design. The head may contain, for example, one valve (single stage homogenization) or two valves in series. QAacnn / zznz / E / YiAi (two-stage homogenization). Subsequently, and depending on the type of high-pressure homogenizing device, the suspension may or may not impact at high speed into a hard impact ring or against another high-speed stream of the same dispersion coming from the opposite direction. The grinding of the pigment particles is achieved by collisions of the particles with each other and with the homogenizer, respectively, and by cavitation. In another preferred embodiment, homogenization of the premix is ​​achieved by means of an ultrasonic homogenizer. Ultrasonic homogenizers exploit acoustic waves in the frequency range of 2030 kHz to grind the pigment particles suspended in the allyl resin. Mechanisms of action include compression-expansion cycles and cavitation. The vibrations are applied to the liquid premix by a submerged probe (or cone). Suitable ultrasonic dispersion equipment typically includes: an ultrasonic generator, an ultrasonic transducer (converter) and a sonotrode (also referred to as a probe or cone). The ultrasonic generator (power supply) generates electrical oscillations of ultrasonic frequency. The ultrasonic transducer converts the electrical oscillations generated by the generator into mechanical vibrations, which are then transmitted to the material to which sound waves (i.e. the bleaching agent) are applied through the sonotrode. At the surface of the sonotrode, mechanical vibrations couple to the bleaching agent (i.e. the liquid premix) resulting in the formation of microscopic bubbles (cavities) within the liquid that expand during low pressure cycles and float violently during cycles. high pressure. This phenomenon, which is called cavitation, generates high shear forces at the tip of the sonotrode and causes the exposed liquid to agitate intensely. In one embodiment, the sonotrode can be immersed directly into the container holding the bleaching agent mixture. In another embodiment, a recirculation system may be used, in which the bleaching agent mixture is continuously recirculated, by means of a pump, through a flow cell where the sonotrode is immersed within the flowing liquid. . It has been found that the level of dispersibility of the pigment particles in the polymerizable component (A), as measurable for example by the PDI value of the pigment in the whitening agent or the polymerizable composition influences the whitening performance of the whitening agent. In one embodiment, the maximum PDI value of the pigment component (B) in the bleaching agent or polymerizable composition is equal to or less than 0.25, preferably equal to or less than 0.20, even more preferably equal to or less than 0.15. In one embodiment, the minimum PDI value of the pigment component (B) in the bleaching agent or polymerizable composition is preferably equal to or greater than 0.05, more preferably equal to or greater than 0.10. The PDI value can also be within any range that is a combination of any of the above PDI values. QAacnn / zznz / E / YiAi Method for producing the polymerizable composition for an optical material It is possible to prepare the polymerizable composition for an optical material according to the present invention by mixing the following as a batch: a component (AA) comprising a compound including two or more allyloxycarbonyl groups, an ultraviolet absorption agent (D), a radical polymerization initiator (E), and at least one bleaching agent that includes a pigmentation component (B) comprising particles of a blue pigment (b1) and optionally of a pigment (b2) as described above. Mixing of the above components to prepare a polymerizable composition is usually carried out at a temperature of 25°C or lower. From the point of view of the shelf life of the polymerizable composition, it may be preferable to further reduce the temperature. However, in a case where the solubility of a catalyst, an internal release agent, and an additive in the monomer (i.e. polymerizable component) is not good, it is also possible to heat and pre-dissolve the above in the monomer and the modifier. resin. In the present embodiment, the method of producing the resin molded article is not particularly limited, but examples of preferable production methods include casting polymerization. First, a polymerizable composition is injected into a space between two molds held by a gasket, tape, or the like. At this time, depending on the physical properties required for the plastic lens to be obtained, in many cases, it is preferable to carry out degassing treatment under reduced pressure, filtration treatment such as pressurization and depressurization, and the like as may be. necessary. Since the polymerization conditions vary greatly depending on the composition of the polymerizable composition, the type and amount of the peroxide initiator used, the shape of the mold, and the like, the conditions are not limited, but the above are carried out for about 1 to 50 hours at a temperature of 0 to 150°C. In some cases, it is preferable to carry out curing while maintaining a temperature range of 20 to 130°C, or gradually raising the temperature, for 1 to 48 hours. The resin molded article may be subjected to treatment such as annealing as necessary. The treatment temperature is usually carried out at 50 to 150°C, but is preferably carried out at 90 to 140°C, and more preferably is carried out at 100 to 130°C. In the present embodiment, when the resin is molded, in addition to the “other components” mentioned above, according to the purpose, in the same way as the known molding methods, various additives such as a chain extender, a cross-linking agent, a light stabilizer, an antioxidant, oil-soluble dye, filler, adhesion improver, and the like. Use It is possible to produce the poly(allyl carbonate) and poly(allyl ester) resins, obtained from the polymerizable composition for an optical material of the present disclosure, as molded articles of various shapes by changing the type of mold during the polymerization of emptied. QAacnn / zznz / E / YiAi The molded article of the present invention has a superior light blocking effect between harmful ultraviolet light and blue light, has an excellent colorless, transparent, external appearance, and is capable of being used by various optical materials such as plastic lenses. In particular, it is possible to suitably use the resin molded article as a lens for plastic spectacles. In particular, articles molded in accordance with the present invention may have a light cutoff at a wavelength of 413 nm or lower, such as a wavelength of 410 nm, 405 nm or 400 nm. Preferably, articles molded in accordance with the present invention have a haze value, measured in accordance with ASTM D 1003, equal to or less than 1.5%, more preferably equal to less than 1%. Preferably, resin molded articles according to the present invention have a refractive index, measured in accordance with ASTM D542, equal to or less than 1,600, preferably within the range of 1,560 to 1,500. Plastic Eyeglass Lenses Plastic eyeglass lenses using the lens base material including the molded article of the present invention may be used after application of a coating layer on one surface or both surfaces thereof, as necessary. The plastic spectacle lenses of the present embodiment include a lens base material including the polymerizable composition described above and a coating layer. Specific examples of the coating layer include a primer layer, a hardcoat layer, an anti-reflection layer, an anti-fog coating layer, an anti-fouling layer, a water repellent layer, and the like. It is also possible to use each of these coating layers alone, or to use a plurality of coating layers in multiple layers. In case of applying coating layers on both surfaces, the same coating layer can be applied to each side or different coating layers can be applied to each side. In each of these coating layers, an infrared absorber for the purpose of protecting the eyes from infrared rays, a light stabilizer, an antioxidant, and a photochromic compound for the purpose of improving the water resistance of the lens, and a dye or pigment for the purpose of improving lens refinement, an antistatic agent, and other additives known to improve lens performance may be used in combination. Various leveling agents for the purpose of improving applicability can be used for the layers to be coated per application. The primer layer is usually formed between a hard coating layer described below and a lens. The primer layer is a coating layer for the purpose of improving the adhesion between the hard coating layer formed therein and the lens, and in some cases, it is also possible to improve the resistance up to Impacts. It is possible to use any material as the primer layer as long as the material has high adhesion to the lens obtained, but in general, a primer composition formed primarily of a urethane-based resin, a QAacnn / zznz / E / YiAi epoxy-based resin, a polyester-based resin, a melanin-based resin, a polyvinyl acetal, or the like is used. The primer composition can be used with an appropriate solvent that does not affect the lens, for the purpose of adjusting the viscosity of the composition. Naturally, the primer composition can be used without a solvent. It is possible to form the primer layer either by a coating method or a drying method. In case of using a coating method, a primer layer is formed by applying the primer composition to a lens by a known coating method such as spin coating, dip coating, or the like and then solidifying the primer composition. In a case where the drying method is used, the primer layer is formed by a known drying method such as a CVD method or a vacuum deposition method. When the primer layer is formed, the surface of the lens can be subjected to pretreatment such as alkaline treatment, plasma treatment, ultraviolet treatment, and the like as necessary for the purpose of improving adhesion. The hard coating layer is a coating layer for the purpose of imparting functions such as scratch resistance, abrasion resistance, moisture resistance, hot water resistance, heat resistance, weather resistance, and the like. lens surface. In general, for the hard coating layer, a hard coating composition that includes an organosilicon compound having curing capacity and one or more kinds of fine oxide particles of elements selected from the group of elements of Si, Al, Sn, Sb, Ta, Ce, La, Fe, Zn, W, Zr, In, and Ti and / or one class or more of fine particles formed from oxides composed of two or more classes of elements selected from this group of elements are uses. In addition to the above components, it is preferable for the hard coating composition to include at least one of amines, amino acids, complexes of metal acetylacetonates, metal salts of organic acids, pardon acids, salts of pardon acids, acids, metal chlorides, and polyfunctional epoxy compounds. The hard coating composition can be used with an appropriate solvent that does not affect the lens or can be used without a solvent. The hardcoat layer is usually formed by applying a hardcoat composition by a known coating method such as spin coating or dip coating and then curing the composition. Examples of curing methods include heat curing and a method of curing by irradiating energy rays such as ultraviolet rays or visible light. In order to suppress the occurrence of interference fringes, it is preferable that the difference in the refractive index of the hard coating layer and the lens be within a range of ± 0.1. The anti-reflection layer is usually formed on the hardfacing layer as necessary. There are organic type and inorganic type anti-reflection layers and, in case of inorganic type, inorganic oxides such as SiO2, TiO2, and the like are used, and the anti-reflection layer is formed by a drying method such as a drying method. vacuum deposition, a sputtering method, an ion plating method, an ion beam assisted method, a CVD method or the like. In the case of an organic type, the anti-reflection layer is formed by a wet process using a composition that QAcicnn / zznz / E / YiAi includes a composite of organosilicon and silica-based fine particles that have an internal cavity. There are single-layer and multi-layer anti-reflection layers, and in the case of use as a single layer, it is preferable that the refractive index is lower than the refractive index of the hard coating layer by at least 0.1. In order to effectively display the anti-reflection function, it is preferable to form a multi-layer anti-reflection film, in which case a low refractive index film and a high refractive index film are laminated alternatively. Also in this case, the refractive index difference between the low refractive index film and the high refractive index film is preferably 0.1 or more. Examples of high refractive index films include films of ZnO, TIO, CeO2, Sb2O5, SnO2, ZrO2, Ta2O5, and the like, and examples of low refractive index films include SIO2 films, and the like. In the anti-reflection layer, anti-fog layer, anti-fouling layer, water-repellent layer can be formed, as required. The method of forming the anti-fog layer, the anti-fouling layer, and the water-repellent layer is not particularly limited as long as there is no adverse effect on the anti-reflection function, the processing method, the processing material, and the like are not particularly limited and it is possible to use known anti-fog treatment methods, anti-fouling treatment methods, water repellent treatment methods, and materials. Examples of anti-fog treatment methods and anti-fouling treatment methods include a method of covering the surface with a surfactant, a method of adding a hydrophilic film to the surface to impart absorbance to water, a method of covering the surface with fine irregularities to increase water absorbency, a method of using photocatalytic activity to impart water absorbency, a method of carrying out a super water repellent treatment to prevent the adhesion of water droplets, and the like. Furthermore, examples of water-repellent treatment methods include a method of forming a water-repellent treated layer by vapor deposition or spraying of a fluorine-containing silane compound or the like, a method of dissolving the fluorine-containing silane compound in a solvent, followed by coating to form a water repellent treated layer, and the like. EXAMPLES A specific description of the present invention based on the examples will now be given, but the present invention is not limited to these examples. CHARACTERIZATION METHODS The molded articles comprising the cured resin were evaluated by the following methods. Resin Yellowing Index (Yl) (ASTM D-1925): Yl was determined with a GretagMacbeth 1500 Plus spectrophotometer. The Yl is defined as: Yl = 100 / Y (1.277X - 1.06Z). Light cutoff ratio at a given wavelength: The transmittance at a given wavelength (e.g. 400 nm, 405 nm, 410 nm) of the article molded in the form of a flat plate having a thickness of 2 mm is measured with a Hewlett-Packard 8453 UV Visible spectrophotometer. The light cutoff ratio at a given wavelength, for example 400 nm, is defined by the following QAacnn / zznz / E / YiAi formula: Cutoff Ratio(40o)% = 100(%) = Transmittance (%) at 400 nm Turbidity value: The molded article obtained in the form of a flat plate having a thickness of 2 mm is tested for haze in accordance with ASTM D 1003 with a hazegard plus digital turbidity meter manufactured by BYK-Gardner. Total light transmittance: The molded article obtained in the form of a flat plate having a thickness of 2 mm was measured for total light transmittance in accordance with ASTM D 1003 with a haze-gard plus digital turbidity meter manufactured by BYK- Gardner. Particle size and polydispersity index (PDI): The particle size and PDI of the pigments dispersed in the whitening agent were measured by the DLS technique according to ISO 22412:2017 using a Zetasizer Nano ZS instrument manufactured by Malvern Panalytical. For measurement, the bleaching agent was diluted 1 / 250 (vol / vol) in RAV 755-T monomer. The temperature of the measurement chamber was maintained at 60°C. Mechanical properties The following parameters were evaluated on an article molded in the form of a flat plate having a thickness of 2 mm: The following parameters were evaluated in a 2 mm thick planar lens: (a) Indentation hardness (ASTM D-785) using a Rockwell durometer, scale M; (b) Staining ability. The ability of the polymerized product to superficially adsorb a coloring agent was determined by immersing a neutral lens in an aqueous bath in which the commercial gray dye BPI, diluted to 10% by weight in demineralized water, was dispersed. The lens was immersed in the staining bath for 20 minutes at a temperature of 90°C. After rinsing with demineralized water, the % Transmittance of the lens was determined under the terms of ASTM D1003; (c) Abrasion resistance with Bayer Scratch Test (ASTM F-735). The surface abrasion resistance capacity of the polymerized product was determined with a Taber oscillation abrasimeter, according to the ASTM F-735 method. This method involves simultaneously subjecting the sample lens and a reference lens made of diethylene glycol bis(allyl carbonate) (CR39) to 600 cycles of oscillation with the abrasive material Alundum ZF-12. The relationship between the increase in Turbidity measured with the Haze-gard plus instrument according to ASTM D-1003 after the abrasion cycles in the sample lens and in the reference lens represents the Bayer abrasion resistance value ( BA). AOpacity (reference lenses) Bayer Abrasion = ---------------------------------AOpacity (sample lenses) BA index values ​​higher than 1 indicate a higher abrasion resistance than that of the reference material; BA index values ​​lower than 1 indicate a lower abrasion resistance than that of the reference material. QAacnn / zznz / E / YiAi Chemicals used in the examples In the Examples, the following components were used. Polymerizable component - RAV 755-T, a mixture of an allyl ester compound, an allyl carbonate compound, and compounds having an allyl ester group and an allyl carbonate group, obtained by ester replacement of a mixture of allyl terephthalate dimethyl, allyl alcohol, diallyl carbonate, and diethylene glycol, manufactured by Acomon; - RAV 7AT, composed of aliphatic poly(allyl carbonate) of diethylene glycol and pentaerythritol, and oligomers thereof, manufactured by Acomon; - RAV 7AX, composed of aliphatic poly(allyl carbonate) of diethylene glycol and pentaerythritol, with higher oligomeric content compared to RAV 7AT, manufactured by Acomon. Pigments - Ultramarine Blue (Pigment Blue 29: 77007 ex Venator); average particle size: 1050 nm; - Hostaperm Blue BT-627-D (Pigment Blue 15:2 manufactured by Clariant); average particle size: 60 nm; - Hostaperm Violet RL-NF (Pigment Violet 23 manufactured by Clariant); average particle size: 45 nm; - Hostaperm Violet ER-02 (Pigment Violet 19 manufactured by Clariant); average particle size: 65 nm; - Hostaperm Red E3B (Pigment Violet 19 (73900) manufactured by Clariant); average particle size: 195 nm: - Rosa Hostaperm EB Transp. (Pigment Red 122 manufactured by Clariant); Average particle size: 55 nm. The average particle sizes above are those reported in the technical data sheets of the respective commercial products. Polymeric dispersing agent - Disperbyk 191 manufactured by BYK-Chemie GmbH; Wessel, Germany. UV absorber - BP6 (2,2'-dihydroxy-4,4'-dimethoxybenzophenone, manufactured by MFCI). Peroxide Radical Polymerization Initiator - Trigonox ADC-NS30 by Akzo Nobel; This product contains about 70% by weight of diethylene glycol bis(allyl carbonate) and 30% by weight of a mixture of isopropyl, sec-butyl and isopropyl / sec-butyl peroxydicarbonates. Preparation of bleaching agents A to I Bleaching agents having the chemical compositions A through I listed in Table 1 were prepared. Each bleaching agent was prepared by weighing the required amount for each component into an HDPE bottle with a wide mouth and which can be sealed with a cap to form a mixture. previous. QAacnn / zznz / E / YiAi After being manually stirred, the premixes were then subjected to one of the following types of homogenization treatment. Yo. Indirect sound wave application (IS): The tightly capped bottle was placed in a multi-frequency ultrasonic bath manufactured by Sonorex, model DT1028H. The total exposure time to ultrasonic treatment (at a temperature of 45 - 55°C) was 4 hours, with manual agitation for 1 minute every hour; ii. Direct application of sound waves (DS): sound waves were applied to the mixture by means of a sound wave application equipment manufactured by Hielscher, model Hl UP400ST, equipped with a titanium sonotrode cone, diameter 14 mm, and a flow cell (model FC 22K, volume 13 ml) and was fed with a diaphragm pump model KNF N300KT.18. The application of sound waves was carried out in continuous mode by making the bleaching agent flow continuously through the flow cell at about 70°C (flow cell speed = 3.0 l / min, residence time of mixing in cell TRT = 0.26 seconds, amplitude 80% to 100%, sonotrode oscillation = 150 microns). The total exposure time of the bleaching agent to the ultrasonic treatment was 4 hours at the maximum sonotrode amplitude; Yo. High Pressure Homogenization (HPH): The bleaching agent prepared according to i was further subjected to high pressure homogenization by means of a Microfluidizer processor, model LM20 manufactured by IDEX Corporation under the following operating conditions: 30,000 psi pressure, temperature of 10°C, total number of 5 cycles (10 minutes). It is noted, however, that a pre-homogenization step according to i, before treatment with HPH, is not mandatory since whitening agents having the same characteristics in terms of average pigment particle size and PDI can be obtained by homogenizing the previous mixtures directly with the HPH device. Preparation of bleaching agents K and L (comparative samples) For comparison purposes, the whitening agents having the chemical compositions K and L listed in Table 2 were prepared according to the same procedure as samples A through I. The premixes were subjected to direct sound wave application under the conditions described under i. The stability of the bleaching agents Η, K, and L was evaluated by visually inspecting the sample for the occurrence of flocculated or settled pigment particles at different times after preparation (1 week, 2 weeks, and 1 month). The samples were evaluated according to the following scale: 0= absent; 1= traces; 2= ​​visible; 3= severe, accompanied by a different color of the liquid phase in the upper meniscus. Preparation and pouring of polymerizable compositions The polymerizable compositions tested herein were prepared by adding the UV absorber, in powder form or as a master bath, and the polymerization initiator to the polymerizable compound under vigorous stirring. The master bath containing the UV absorber was prepared by adding the UV absorber in powder form to the polymerizable compound A (RAV 755-T) at a concentration of 1.0% or 2.0% by weight based on the weight of the master bath. This mixture is then QAacnn / zznz / E / YiAi heated at 70-80°C with stirring until a clear solution was obtained, and then allowed to cool to room temperature. The bleaching agent was then added to the polymerizable mixture containing the UV absorber and the radical initiator to form the polymerizable composition. Before pouring, the polymerizable composition was mixed vigorously with a magnetic stirrer and degassed for 30 minutes at a pressure between 100-300 mbar. Unless otherwise described, the degassed mixture was filtered on a 5 micrometer (47 mm diameter) PTFE membrane before filling the molds. Alternative filtration media include polypropylene cartridges, in particular: - HDCII - DFA cartridges supplied by PALL, which have a pleated membrane filtration bed with absolute filtration pore size ranging from 6 to 10 microns; - Profile Star cartridges supplied by Pall, deep filters with absolute filtration pore size of 5 microns. The polymerizable compositions were poured and polymerized into the form of lenses having a thickness of 2 mm by pouring them into glass molds. The molds were made of two glass half-molds joined together by means of a spade joint made of low-density polyethylene (LDPE) to form a cavity suitable for containing the polymerizable composition. As an alternative to gaskets, adhesive sealing tapes can be used. Polymerization was carried out by means of heat treatment in a forced air circulation oven, with a gradual increase in temperature as indicated below. At the end of the heat treatment, the molds were opened and the lenses were kept at 110°C for 1 hour in order to decompose possible residual amounts of the peroxide initiator. The polymerizable compositions listed in Tables 3 and 4 that have a cutoff (i.e., transmittance T is 1% or less at the indicated wavelength) at the UV wavelengths of 355 nm and 365 nm (UV cutoff) and HEV wavelengths of 400 nm, 405 nm, and 410 nm (HEV cutoff) were prepared. Table 1 - Bleaching agents A - I QAacnn / zznz / E / YiAi Component {%*) A B E F G H I RAV 755-T 96.0 96.0 94.3 96.0 96.1 95.9 95.9 Ultramarine Blue 1.9 1.9 1.9 1.9 1.9 1.9 1.9 Hostaperm Blue BT627D - - - - - - - Hostaperm Violet RL-NF - - - - - - - Violet Hostaperm ER-02 - - 1.9 - - - - Red Hostaperm E3B 0.2 - 0.2 0.1 - - Pink Hostaperm EB T. - 0.2 - - - 0.3 0.3 Disperbyk 191 1.9 1.9 1.9 1.9 1.9 1.9 1.9 Homogenization IS IS IS DS DS DS HPH Average particle size z (nm)b 440 420 420 280 280 200 160 PDIb 0.29 0.28 0.28 0.24 0.24 0.21 0.23 QAacnn / zznz / E / YiAi a: weight percentage of the component based on the weight of the bleaching agent; b: z-average particle size and PDI measured in the bleaching agent composition. Table 2 - Bleaching agents K and L (comparative) Component (%)a H K* L* RAV 755-T 95.9 - 97.8 RAV 7AX 95.9 - Disperbyk 191 1.9 1.9 - Ultramarine blue 1.9 1.9 1.9 Pink Hostaperm EB T. 0.3 0.3 0.3 Average particle size z (nm)b 200 220 500 PDI1U 0.21 0.21 0.15 Dispersion stability0 H K L 1 week 0 2 1 2 weeks 0 3 3 1 month 1 3 3 *: comparative samples a: percentage by weight of the component based on the weight of the bleaching agent; b: z-average particle size and PDI measured in the bleaching agent composition; c: occurrence of pigment precipitation determined by visual inspection (0 = absent; 1 = traces; 2 = visible; 3 = severe, accompanied by a different liquid color in the upper meniscus). Table 3 - Molded articles cured in the absence of the bleaching agent3 % of component6 UV compositions HEV compositions REF1 REF2 1 2 3 3bis 4 5 5bis Cut (nm) 355 365 400 400 400 400 405 410 410 RAV 7AT 88.96 - 88.82 - - - - - - RAV 7AX - - - 71.0 - - - - - RAV 755-T - 89.4 - - 89.85 82.5 89.7 89.4 60 ADC NS30 11.0 10.0 11.00 11.0 10.0 10.0 10.0 10.0 10 BP6C 0.04 0.06 0.18 - 0.15 - 0.3 0 .6 - RAV 7AX MBUVAd - - - 18.0 - - - - - RAV 755- T MBUVAd - - - - - 7.5 - - 30 Yl 0.50 3.15 4.00 4.05 5.10 5.05 6.80 10.40 40.50 % of Turbidity 0.28 0.30 0.31 0.28 0.34 0.33 0.34 0.30 0.28 % of total T 93.4 93.6 93.4 93.6 93.5 93.5 92.8 92.4 92.4 % of T 400nm 90.2 68.7 0.9 0.9 0.6 0.6 <0.1 <0.1 <0.1 405nm 91.7 75.9 13.2 12.1 6.0 6.0 0.8 <0.1 <0.1 410nm 93.3 80.3 35.0 34.1 21.9 21.9 8 .4 0.7 0.7 a: curing program (°C) 40 - 40(3h) - 50(7h) - 80(9h) - 80(1h) Annealing = 1 h @ 110°C b: weight percentage of component based on weight of the polymerizable composition c: added component in powder form d: RAV 7AX MBUVA = master bath containing 1% by weight of BP6 UV absorber in the RAV 7AX monomer e: RAV 755-T MBUVA = master bath containing 2% by weight of BP6 UV absorber in RAV 755-T monomer Table 4 - Molded articles cured in the presence of the bleaching agents (A) Η, K and La Composition no. Component (%b) 16 17 18 Cut (nm) 400 400 400 RAV 7AX 88.82 88.82 88.82 ADC NS30 11.00 11.0 11.0 BP6C 0.18 0.18 0.18 BA Hd 0.07 - - BA K° - 0.07 - BA La - - 0.07 YI 2.50 2.82 2.90 % turbidity 0.40 0.66 0.86 % total T 92.0 92.0 92.0 % T 400nm 0.9 0.9 0.9 QAacnn / zznz / E / YiAi a: curing program (°C) 40 - 40(3h) - 50(7h) - 80(9h) - 80(1 h) Annealing = 1 h @ 110°C b: percentage in weight of component based on weight of polymerizable composition c: component added in powder form d: bleaching agent added to the mixture after appropriate re-dispersion; pouring the solution into molds without filtration. The results reported in Table 2 show that the use of the aromatic component (A) in combination with a polymeric dispersing agent allows to obtain whitening agents containing pigment particles that have a very small z-average particle size and good stability up to 1 month (sample H). Differently, when an aliphatic component A is used (sample K) or the polymer dispersion is absent (sample L) the pigment particles tend to aggregate and flocculate after a short time (1 week) and their average particle size z increases substantially. The results reported in Table 1, in particular the significant lower z-average particle size and PDI of samples F through I (160 nm - 280 nm) compared to samples A, B and E (420 nm - 440 nm) , show that the direct sound wave application (DS) and high pressure homogenization (HPH) treatments significantly improve the dispersions of the pigment particles compared to the indirect sound wave application (IS) treatment. The characterization results reported in Table 3 confirm that compositions containing no bleaching agent and including insufficient amounts of UV absorbers do not achieve complete protection towards HEV radiations (i.e. 400 nm or higher) and show, however, a low yellowing index (YI), especially when aliphatic allyl resins such as RAV 7AT are used. Compositions such as samples REF1 and REF2 of Table 3 are commonly used for the production of transparent, colorless lenses. The results in Table 3 also show that by increasing the content of UV absorber in the polymerizable composition it is possible to achieve cuts in the wavelengths in the blue light region, but at the cost of a significant increase in the YI (see the samples 1 to 5 bis of HEV). The performance of the whitening agents Η, K and L in a polymerizable composition containing an aliphatic polymerizable component AA were compared in the Table. The aliphatic polymerizable component AA corresponded to composition HEV 1 of Table 3. The bleaching agents were redispersed by manual shaking followed by indirect sound wave application (30 minutes), added to the pouring mixture and shaken. The casting mixture was poured directly into the molds without any prior filtration in order to evaluate the performance of the bleaching agent under the worst operating conditions. Polymer test results indicate that: - Composition 16 that incorporates the whitening agent H shows the best general optical characteristics in terms of both Yl and final haze of the lens; - Composition 17 incorporating bleaching agent K shows optical parameters similar to those of sample 16, but due to the tendency of the dispersion to flocculate and aggregate, the final Yl and turbidity are worse than those of compositions 16; - The effect of the broader particle size distribution can be inferred from sample 18 incorporating bleaching agent L, where increased yellowing and turbidity were observed. The performance of the whitening agents listed in Table 1 when incorporated with sample 4 of the polymerizable composition of Table 3 (cutoff at the HEV wavelength of 405 nm) was further evaluated. For this purpose, samples of 6 to 15 having the composition listed in Table 5 were cast and cured and the obtained lenses were characterized. The results of this characterization are reported in Table 5 and were compared to unbleached sample 1 in Table 3. QAacnn / zznz / E / YiAi Table 5 - Polymerizable compositions with 405nm cut-off (with bleaching agent)3 Component (%b) Composition n. 0.3 0.3 0.3 ADC NS30 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 BA (homogenization) A (IS ) 0.6 B (IS) 0.6 E (IS) 0.6 F (IS) 0.6 G (DS) 0.6 H (DS) 0.3 H (DS) 0.25 I (HPH) 0.3 Yl 6.80 5.16 5.88 5.22 5.03 3.49 4.70 4.77 5.30 % Turbidity 0.34 0.95 0.45 0.70 1.32 1.25 0.51 0.49 0.52 % of total T 92.8 90.6 91.1 90.6 90.6 89.0 89.3 90.3 89.4 % of 400nm <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 T 405nm 0.8 0.7 0.6 0.8 0.5 0.7 0.8 0.6 0.6 a: Curing program (°C) = 40 - 40(3h) - 50(7h) - 80(9h) - 80(1h), Annealing = 1 h @ 110°C b: component weight percentages based on the weight of the polymerizable composition Whitening agents A, B and E (samples 6, 7 and 10, respectively) were prepared by indirect sound wave application using an ultramarine blue pigment in combination with an additional pigment selected from red pigment, pink pigment or violet pigment, respectively. to adjust the color tone. The characterization of the lenses obtained by using whitening agents A, B and E showed the following results: - compared to sample 1, the incorporation of whitening agents A, B and E led to a decrease in Yl, which indicates that the final lens appears less yellow to the human eye; - compared to sample 1, the incorporation of bleaching agents A, B and E also led to an increase in turbidity, whose value however remains lower than 1%, which is a very good value; - incorporation of bleaching agents B and E led to a lower volume value compared to bleaching agent A; this could be due to the smaller average particle size of the red and violet pigments used (i.e., the average particle size of the commercial pigment used as a starting material); The use of pigments having a smaller particle size as starting material, however, does not facilitate their dispersion in the whitening agents as shown by the PDI values ​​of samples A, B and E which are very similar; - the incorporation of whitening agents A, B and E reduced the total transmittance (% T) of the lens, which however remains at values ​​higher than 88%, that is, a very good result for the colorless lens that represents a cut to 405nm. From the results in Table 5 it is evident that the use of direct sound wave application or high pressure homogenization in the preparation of the whitening agent allows to effectively correct the yellowing of the lens (i.e., decreases the Yl) carried around of by the UV absorber necessary to achieve HEV cutoff (samples 11 to 15), while maintaining the other optical properties at the desired levels, particularly maintaining high levels of light transmission and acceptable levels of haze. On the other hand, the high level of dispersion of the pigment particles exhibited by the bleaching agents F to I provides the advantage of preventing or at least reducing the formation of pigment particles that are susceptible to being retained by the filters used for filtration. of the polymerizable composition before pouring. Whitening agents in this manner are more efficient than those produced according to the known art, since lower amounts of pigments are sufficient to achieve the same whitening effect. The improved effectiveness of these bleaching agents is confirmed by experimental tests carried out on samples 6, 11 and 12, where bleaching agents A, F and G having the same or almost the same chemical composition have been used. Samples 11 and 12, which were obtained using whitening agents F and G, respectively, which had been homogenized by direct sound wave application, both led to molded articles having a lower Yl compared to the lens prepared with the whitening agent. A (sample 6) that was homogenized by application of indirect sound waves in an ultrasonic bath. In sample 12, however, a significant reduction in Yl was achieved with a lower dosage of the red pigment compared to test 11 and especially to test 6. Similar conclusions can be drawn from samples 13 and 14 incorporating bleaching agent H, which has substantially the same composition as bleaching agent B, the latter having been treated by indirect sound wave application instead of direct sound wave application. The application of direct sound waves allowed us to obtain a lower pigment particle size (200 nm) and a higher level of dispersions (PDI = 0.21), which in turn allows us to obtain an effective reduction of Yl, good levels of light transmittance. total using a reduced dosage of QAacnn / zznz / E / YiAi bluing agent (0.30% and 0.25% for samples 13 and 14, respectively). Results comparable to those of sample 14 have been obtained using bleaching agent I, which has the same composition as bleaching agent H, bleaching agent I having been homogenized by means of a high-pressure homogenizer. Whitening agent I is characterized by a lower average pigment particle size than that of H and by a slightly higher PDI value than that of whitening agent H. Comparison of molded articles showing UV and HEV cuts cured in the presence and absence of the bleaching agent. The whitening agent H was incorporated into the polymerizable compositions 1, 3, 4 and 5 having the compositions listed in Table 3 in order to evaluate its effectiveness in the manufacture of lenses based on different types of allyl resins and having different cuts. . The results are reported in Tables 6 and 7 together with those of the corresponding molded articles obtained starting from the same composition but in the absence of any bleaching agent. QAacnn / zznz / E / YiAi Table 6 - UV400 Package Evaluation Component (%b) Composition n. 1 1-BA 1-BA 3 3-BA RAV 7AT 88.82 88.68 - - - RAV 7AX - - 88.68 - - RAV 755-T - - - 89.85 89.65 ADC NS30 11.0 11.0 11.0 10.0 10.0 BP6 0.18 0.18 0.1 8 0.15 0.15 BA - 0.14 0.14 - 0.20 Yl 4.00 2.72 2.62 5.10 3.17 % of Turbidity 0.31 0.38 0.32 0.34 0.35 % of total T 93.4 91.9 92.5 93.5 91.4 % of T 400nm 0.9 0.9 0.9 0.6 0.6 a: Curing program (°C) = 40 - 40(3h) - 50(7h) - 80(9h) - 80(1h), Annealing = 1 h @ 110°C b: component weight percentages based on the weight of the polymerizable composition Table 7- Evaluation of HEVa packages Component (%b) Composition n. 4 4-BA 5 5-BA RAV 755-T 89.7 89.4 89.4 89.0 ADC NS30 10.0 10.0 10.0 10.0 BP6 0.3 0.3 0.6 0.6 BA % - 0.3 - 0.4 Yl 6.80 4.70 10.40 7.05 % of Turbidity 0.34 0.51 0.30 0.70 % of total T 92.8 89.3 92.4 88.02 % of T 400 <0.1 <0.1 <0.1 <0.1 405 0.8 0.8 <0.1 <0.1 410 8 .4 8.4 0.7 0.7 QAacnn / zznz / E / YiAi a: Curing program (°C) = 40 - 40(3h) - 50(7h) - 80(9h) - 80(1h), Annealing = 1h @ 110°C b: percentages by weight of the component based on the weight of the polymerizable composition The results of Tables 6 and 7 show that the incorporation of the whitening agent H allows to effectively obtain colorless and transparent lenses that show UV or HEV cutoff as well as a level acceptable turbidity when different allyl resins are used as an AA polymerizable component. Evaluation of Mechanical Properties and Stainability of Molded Articles Showing Cured UV and HEV Cuts in the Presence and Absence of the Whitening Agent The mechanical properties of some UV and HEV compositions have been evaluated in the presence or absence of the bleaching agent H from Table 3. Table 8 - Molded articles cured in the absence of the bleaching agent3 Component %b Composition no. 1 1-BA 3 3-BA 4 4-BA 5 5-BA RAV 7AT 88.82 88.68 - - - - - - RAV 755-T - - 89.85 89.65 89.7 89.4 89.4 89.0 ADC NS30 11.0 11.0 10.0 10.0 10.0 10 .0 10.0 10.0 BP6 0.18 0.18 0.15 0.15 0.3 0.3 0.6 0.6 % BA - 0.14 - 0.20 - 0.3 - 0.4 HRM, num 87 87 93 93 92 92 92 92 Bayer test 1.1 1.1 0.8 0.8 0.7 0.7 0.7 0.7 Capacity staining % of total T 29 29 22 22 21 20 20 20 Color homogeneity Yes Yes Yes Yes Yes Yes Yes Yes Yes a: Curing program (°C) = 40 - 40(3h) - 50(7h) - 80(9h) - 80(1h), Annealing = 1 h @ 110°C b: component weight percentages based on the weight of the polymerizable composition The results in Table 8 show that the incorporation of the bleaching agent H allows effective UV and HEV protection to be achieved without any substantial problem to the mechanical properties and stainability of the polymerized compositions.

Claims

1. A bleaching agent comprising: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a coloring component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A), wherein the particles of the coloring component (B) have an average size z equal to or less than 400 nm, as measured by the Dynamic Light Scattering technique according to ISO 22412:2017.

2. The bleaching agent according to claim 1, wherein the coloring component (B) is contained in the range of 0.1% to 5.0% by weight with respect to component (A).

3. The bleaching agent according to claim 1 or 2, wherein the polymeric dispersing agent (C) is contained in the range of 0.1% to 10% by weight with respect to component (A).

4. The bleaching agent according to any of claims 1 to 3, wherein the polymerizable component (A) is a compound having the following Formula 1. wherein in Formula (1): - n is an integer from 2 to 6, - Ri denotes a hydrogen atom or a methyl group, a plurality of R / s present may be the same or different, - X is a divalent to hexavalent organic group derived from an aromatic compound having 6 to 12 carbon atoms.

5. The bleaching agent according to claim 4, wherein the polymerizable component (A) is a compound or a mixture of compounds selected from those having the following Formulas (3), (4) and (5): wherein in Formula (4) X represents a divalent group derived from a linear or branched aliphatic diol having 2 to 8 carbon atoms or a trivalent to hexavalent group derived from a linear or branched aliphatic polyol having 3 to 10 carbon atoms and having 3 to 6 hydroxyl groups, and n is an integer from 2 to 6; wherein in Formula (5) X represents a divalent group derived from a linear or branched aliphatic diol having 2 to 8 carbon atoms or a trivalent to hexavalent group derived from a linear or branched aliphatic polyol having 3 to 10 carbon atoms and having 3 to 6 hydroxyl groups, myn represent integers from 0 to 6, and the sum of myn is an integer from 2 to 6;with the condition that none of the compounds of Formulas (3) and (4) are present, in Formula (5) n represents integers from 1 to 6 and the sum of m and n is an integer from 2 to 6.; 6. The bleaching agent according to any of claims 1 to 5, wherein the coloring component (B) includes particles of one or more additional pigments (b2), different from the blue pigment (b1).

7. The bleaching agent according to claim 6, wherein the weight ratio between the pigment particles (b1) and the pigment particles (b2) is within the range of 5:1 to 15:

1.

8. The bleaching agent according to any of claims 1 to 7, wherein the particles of the coloring component (B) have an average size z equal to or less than 280 nm, measured by the Dynamic Light Scattering technique according to ISO 22412:2017.

9. The bleaching agent according to any of claims 1 to 8, wherein the particles of the coloring component (B) have an average size z equal to or greater than 20 nm as measured by the Dynamic Light Scattering technique according to ISO 22412:2017.

10. The process for preparing the bleaching agent according to claim 1, comprising the following steps in sequence: - providing a premix by mixing: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a coloring component comprising particles of a blue pigment (b1), (C) a polymeric dispersing agent for dispersing the particles of the coloring component (B) in the polymerizable component (A), - homogenizing the premix to obtain a bleaching agent wherein the particles of the coloring component (B) have an average size z equal to or less than 400 nm, as measured by the Dynamic Light Scattering technique according to ISO 22412:2017.

11. The process according to claim 10, wherein, in the step of providing a premix, the coloring component (B) is mixed in the range of 0.1% to 5.0% by weight with respect to component (A).

12. The process according to claim 10 or 11, wherein, in the step of providing a premix, the polymeric dispersing agent (C) is mixed in the range of 0.1% to 10% by weight with respect to component (A).

13. The process in accordance with any of claims 10 to 12, wherein the step of homogenizing the previous mixture is carried out by sonication using a sonotrode.

14. The process in accordance with any of claims 10 to 12, wherein the step of homogenizing the previous mixture is a high-pressure homogenization (HPH) step.

15. A polymerizable composition for an optical material comprising: (A) a polymerizable component comprising an aromatic ester compound including two or more allyloxycarbonyl groups, (B) a colorant component comprising particles of a blue pigment (b1); (C) a polymeric dispersing agent for dispersing the particles of the colorant component (B) in the polymerizable component (A); (D) an ultraviolet absorption agent; and (E) a radical polymerization initiator, wherein the particles of the coloring component (B) have an average size z equal to or less than 400 nm, measured by the Dynamic Light Scattering technique according to ISO 22412:2017, and the polymeric dispersing agent (O) comprises a polymeric part and one or more pigment-loving groups: carboxylic group, sulfate group, sulfonate group, amine salts, phosphate group, phosphonate group, carbamate group, urea group, amide group or amine group.

16. The polymerizable composition according to any of claim 15, further comprising a polymerizable component comprising an aliphatic or cycloaliphatic compound including two or more allyloxycarbonyl groups.

17. The process for preparing a polymerizable composition for an optical material comprising the following steps in sequence: - providing a bleaching agent according to any of claims 10 to 14 - mixing the bleaching agent with (AA) a polymerizable component comprising a compound including two or more allyloxycarbonyl groups and (D) an ultraviolet absorption agent and (E) a radical polymerization initiator.

18. The process according to claim 17, wherein, in the step of providing a premix, the coloring component (B) is mixed in the range of 0.1% to 5.0% by weight with respect to component (A).

19. The process according to claim 17 or 18, wherein, in the step of providing a premix, the polymeric dispersing agent (C) is mixed in the range of 0.1% to 10% by weight with respect to component (A). QAacnn / zznz / E / YiAi 20. A molded article, obtained by curing a polymerizable composition in accordance with claim 15 or 16.

21. An optical material comprising the molded article according to claim 20.

22. A plastic lens comprising the molded article according to claim 20.

23. A method for manufacturing a plastic lens comprising the following steps in sequence: i) providing a polymerizable composition for an optical material according to claim 15 or 16; ii) pouring the polymerizable composition into at least one mold; iii) curing the polymerizable composition to obtain a plastic lens.