34results about How to "Low yellowness" patented technology

Provided is a resin composition including a polyimide precursor that has exceptional adhesiveness to glass substrates and that does not generate particles during laser detachment. A resin composition containing (a) a polyimide precursor, (b) an organic solvent, and (d) an alkoxysilane compound, wherein the resin composition shows polyimide obtained by imidation of the (a) polyimide precursor after application of the resin composition to the surface of a support, the residual stress with the support is from -5 MPa to 10 MPa, and the 308 nm absorbance of the (d) alkoxysilane compound when made into a 0.001 mass% NMP solution is from 0.1 to 0.5 at a solution thickness of 1 cm.

The present invention relates to a polythiol compound for optical materials exhibiting desirable characteristics from a coloring perspective, a composition comprising same for optical materials, and a method for producing optical materials. The present invention provides a method for producing a polythiol compound for optical materials which reacts epichlorohydrin compound having total impurities content of less than 0.5 wt% and 2-Mercaptoethanol. The present invention allows obtaining a polythiol compound exhibiting suppressed coloration, and by using same, allows obtaining a urethane group exhibiting suppressed coloration, low yellowness and good coloring. The polythiol compound according to the present invention can be used in the production of a variety of optical materials such as a urethane group, and optical lenses having good coloring, obtained by means of the present invention, can replace existing lenses and be widely used in diverse fields, particularly as lenses for glasses, polarized lights and cameras.

A reducing and bleaching composition for decoloured waste pulp is prepared from sodium dithionite (5-15 wt.%), chelating agent (1.25-15), sodium carbonate or sodium hydroxide or their mixture (0.25-3) and water (79.5-93.5) through uniform mixing. Its bleaching method features that the stabilizer and said composition are cooperated, and the oil or solvent not dissolved in water is added to isolate air, so improving the stability of bleaching liquid, reducing consumption of sodium dithionite and improving bleaching effect. Its advantages include less damage to strength and opaqueness of paper fibres, less corrosion to pipeline, less pollution and low cost.

The invention proivdes an optical film being capable of reducing yellow degree. The optical film is described in such way: for a sunken part satisfying the following conditions (1) and (2), the number of the sunken parts is lower than 4 per 10000 [mu]m<2> on a single surface and a back surface of the optical film. (1) the depth of the sunken part is more than 200 nm; (2) the diameter of the part, which is higher than 200 nm in depth, of the sunken part is more than 0.7 [mu]m.

According to the present invention, an anti-glare film is prepared in which the ratio R / V of diffusion specular reflection intensity R to total diffusion reflection intensity V is 0.01-0.12, and the absolute value of the chromaticity b* of transmitted light is 3 or less. The anti-glare film comprises: a transparent substrate layer; and an anti-glare layer formed on at least one surface of the transparent substrate layer, wherein the anti-glare layer may be a cured product of a curable composition containing one or more polymer components and one or more curable resin precursor components, andin particular, at least two components selected from among the polymer components and the curable resin precursor components may be phase-separated by wet spinodal decomposition. This anti-glare filmcan have both non-coloring properties and anti-glare properties.

The invention relates to an apparatus and process for preparing high-molecular-weight polyester by ring-opening polymerization of a cyclic ester; the process comprises the steps of feeding raw cyclic ester (L101) into a preheating kettle, and melting to form first liquid (L102); dissolving a catalyst and a photoinitiator in a solvent to form second liquid (L103); adding both the first liquid (L102) and the second liquid (103) into static mixer (2), and mixing well to form third liquid (L104); feeding the third liquid to atomizing nozzle (6) at the top of a reaction boiling bed (3), atomizing, spraying into the reaction boiling bed (3), reacting under an inert carrier gas to obtain first solid (L105), feeding the first solid to solid tackifying boiling bed (4), performing tackifying reaction to obtain second solid (L106), feeding the second solid to a bag filter (5), and isolating to obtain the product, the high-molecular-weight polyester. Compared with the prior art, the apparatus and process can provide continuous production and high production efficiency, and the obtained product has high molecular weight and low yellow value.

The object of the present invention is to provide an optical film comprising a polyamide-imide resin, especially a polyamide-imide resin-containing optical film which can be suitably used as a front plate of a flexible display or the like, and which can improve surface hardness even under relatively low-temperature heating conditions. Optical film of imide resin. The present invention provides an optical film comprising a polyamide-imide resin having a peak of tan δ measured by DMA in a temperature range of 300 to 370° C. and having a YI value of 3 or less.

The invention provides a multifunctional screen protection film which sequentially comprises a release film layer, an optimal adhesive layer, a base material layer and a multifunctional layer, wherein the optical adhesive layer is arranged on the release film layer, the base material layer is arranged on the optical adhesive layer, and the multifunctional layer is arranged on the base material layer and comprises an anti-blue-light agent, an antistatic agent and anti-newton's-ring coating resin. The multifunctional screen protection film has antistatic, anti-blue-light and anti-newton's-ring functions and has better anti-blue-light performance and the lower yellowing degree, so that the comfort degree of the screen protection film in use is increased. Besides, the multifunctional screen protection film is high in hardness, large in adhesive force, simple in structure, easy to produce and low in cost.

A resin composition for optical stereolithography including a cation-polymerizable organic compound (A), a radical polymerizable organic compound (B), a cationic polymerization initiator (C) and a radical polymerization initiator (D), wherein the cationic polymerization initiator (C) is an aromatic sulfonium compound (C-1) represented by the following general formula (C-1):wherein R1, R2, and R3 represent a monovalent organic group, Rf represents a fluoroalkyl group, m is the same number as the cationic charge of the “cation [S+(R1)(R2)(R3)]”, and n is an integer in a range of 0 to 6. The resin composition also includes an aromatic thiol compound (E) represented by the following general formula (E):R4SH)p  (E)wherein, R4 represents a mono- or di-valent aromatic hydrocarbon which may optionally have a substituent, and p is an integer of 1 or 2.

The present invention addresses the problem of preparing a light-diffusing film that has a haze of at least 50%, an inner haze of at most 15%, and a total light transmittance of at least 90%. This light-diffusing film may be configured such that the light transmitted therethrough has a chromaticity b* of 10 or less and a chromaticity a* of 2 or less. The light-diffusing film includes a transparentfilm and a light-diffusing layer formed on at least one side of the transparent film, and the light-diffusing layer may have a 60 DEG-gloss value of 10% or less. The surface of the light-diffusing layer may have an arithmetic average surface roughness Ra of 0.3 mum or more. The average interval Sm between the irregularities on the surface of the light-diffusing layer may be 100 mum or less. The light-diffusing layer can be a cured material of a curable compound that contains at least one type of a polymer component and at least one type of a cured resin precursor component. This light-diffusing film exhibits high degrees of light diffuseness and luminance.