31results about How to "Reduced coloration" patented technology

A subject for the invention relates to processes for producing a polycarbonate containing a plant-derived starting material and to molded articles thereof, the polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, low birefringence, and excellent transparency. The invention relates to a process for producing a polycarbonate which includes a step in which one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof are reacted with a carbonic acid diester in the presence of a polymerization catalyst, wherein the dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof has a formic acid content lower than 20 ppm. The invention further relates to a molded article constituted of a polycarbonate or a composition of the polycarbonate, the polycarbonate being a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one linking group —CH₂—O— in the molecule thereof and has an Abbe number of 50 or larger and a 5% weight loss temperature of 340° C. or higher.

A method for preparing an optical film, which comprises applying and developing an application liquid mixture containing a liquid crystal monomer, a chiral agent and a polymerization initiator on an orientation substrate, subjecting the resultant developed layer to a heat treatment, to orient the monomer to a cholesteric structure, and then subjecting the developed layer to a poltmerization treatment, to polymerize the oriented liquid crystal monomer, thereby forming an optical film exhibiting a selective reflection wave length of 100 to 320 nm. An optical film prepared by the above method is reduced in the coloring due to selective reflection.

The present invention provides a process for producing a titanium-containing metal oxide the coloration of which is decreased; a hologram recording material suitable for holographic memory recording using a blue laser, wherein a titanium-containing metal oxide the coloration of which is decreased is used as a metal oxide matrix; a process for producing the same; and a hologram recording medium. A process for producing a metal oxide comprising at least Ti as a metal element, the process comprising: providing an alkoxide compound of Ti to which a glycol other than any geminal diol and any vicinal diol is coordinated; hydrolyzing the alkoxide compound of Ti to which the glycol is coordinated, thereby yielding a precursor of a metal oxide; and advancing polycondensation reaction of the metal oxide precursor, thereby forming the metal oxide.

An optical element of the invention comprises at least two laminated circular-polarization-type-reflection polarizers (a) whose wavelength bands for selective reflection of polarized light overlap one another, wherein the at least two circular-polarization-type-reflection polarizers (a) each have a side capable of selectively reflecting a relatively short wavelength in the wavelength bands for selective reflection, and the sides of said at least two circular-polarization-type-reflection polarizers (a) capable of selectively reflecting the relatively short wavelength are arranged opposite to each other. The optical element condenses or collimates incident light from a light source and can control transmission of light at large incident angles relative to the normal direction, increase front brightness and reduce coloration.

A process for producing a cellulose ester film that is produced by a melt casting method using no solvent at film formation, and that attains reduction of bright spot foreign matter, excelling in planarity, and that attains reduction of staining, excelling in dimensional stability. It is also intended to provide such a cellulose ester film, a polarizing plate and a liquid crystal display unit. There is provided a process for producing a cellulose ester film, characterized by forming into a film a material containing a cellulose ester and an ester compound of 1 to 7.5 distribution coefficient obtained by condensation of a polyhydric alcohol and an organic acid of the general formula: (1) according to a melt casting method.

Using at least one compound selected from the group consisting of a zirconyl compound and a zirconium alcoholate as an allophanation catalyst, an allophanate group-containing polyisocyanate composition is produced from a starting material of at least one isocyanate compound selected from the group consisting of an aliphatic diisocyanate, an alicyclic diisocyanate and an isocyanate pre-polymer obtained therefrom, and another starting material of a hydroxyl group-containing compound.

The invention discloses an organic network preparation method of ferrozirconium red zirconia nano-composite ceramic powder. The organic network preparation method comprises the following steps: mixing polyvinyl alcohol with water, heating, stirring, standing, and cooling to the room temperature, so as to obtain an organic network precursor solution; sequentially adding zirconium oxychloride, iron nitrate nonahydrate, silica sol and glutaraldehyde while stirring so as to generate Zr<4+> and coloration ion/organic network gel; after standing, soaking in ammonia water, washing with deionized water until the mixture is neutral, and drying and crushing to generate dry gel powder; calcining so as to obtain the ferrozirconium red zirconia nano-composite ceramic powder. According to the organic network preparation method, ceramic colorant pigments and zirconia ceramic powder are mixed at nano scale, the uniform degree of the mixture of the pigments and the ceramic raw material powder is greatly increased, the sintering temperature of composite powder is decreased, sintered red zirconia ceramic is high in strength and good in color generation, and the influences of carbon residues generated after the combustion of organic matters on the purity of the ferrozirconium red zirconia powder are reduced.

A phenol-modified polyorganosiloxane suitable as a modifier for an organic resin, in which a platinum metal content is reduced, and the yellowing is reduced, a method for preparing the same, and a modifier for an organic resin containing the same are provided. The phenol-modified polyorganosiloxane is a compound of formula (I), having a platinum metal content of 0.9 ppm or less. The phenol-modified polyorganosiloxane can be prepared by subjecting a phenol compound substituted with an alkenyl group of formula (IV) and a polyorganohydrogen siloxane of formula (V) to a hydrosilation reaction in the presence of a platinum-based catalyst applicable to a homogenous system, and subsequently, reducing the platinum metal content of the resulting product to 0.9 ppm or less by conducting one or more filtration procedures selected from the group consisting of filtration conducted where activated carbon is added, filtration conducted by using a filter comprising activated carbon, and filtration conducted by using a filter capable of adsorbing cations, alone or in combination.

The present invention provides an innovative N-vinylamide polymer with decreased contents of impurities and suppressed coloration, a higher K-value, and preferably usable in a variety of fields such as cosmetic and pharmaceutical products, and to provide a production method of the polymer. An N-vinylamide polymer comprising an N-vinylamide monomer unit, wherein the N-vinylamide polymer has K-value of 60 or higher, a content of hydrolysis products of N-vinylamide monomer of 0.02% by weight or less, a content of ashes of 0.1% by weight or less, and hue of 10% aqueous solution of 10 or less measured according to JIS K0071.

The method for producing a polythiol compound includes reacting 2-mercaptoethanol having a water content of 3000 ppm or less on a mass basis, with epihalohydrin to obtain a halide represented by the formula (1), wherein X represents a halogen atom; and obtaining at least one polythiol compound selected from the group consisting of a polythiol compound represented by the formula (4), a polythiol compound represented by the formula (5), a polythiol compound represented by the formula (6), and a polythiol compound represented by the formula (7).

Deboned meat is subjected to processing in a surimi-type procedure in order to substantially reduce the heme content and thus the color intensity of the deboned meat, with bone marrow components and fat also being removed. When desired, the washed meat is subjected to dewatering, such as by pressing, in order to provide a color and fat reduced deboned meat. Multiple-stage separation is practiced, and the protein yield of the washed meat is advantageously elevated.

Organosilicon compounds having at least one ≡SiH unit per molecule are functionalized via heterogeneous catalysis into, for example, epoxidized POS by hydrosilylation between an ethylenically unsaturated epoxide such as VCMX and a hydrogenated POS of the MDD′M type with M=R₃SiO_1/2, D=R₂—SiO_2/2, D′═RH═SiO_2/2, in which R=alkyl, and wherein the viscosity of the final product is controlled, i.e., to limit the parasitic reactions of cationic polymerization by opening of heterocycles, resulting in partial or total gelling of the reaction mixture, said hydrosilylation characteristically being carried out in the presence of at least one inorganic non-nucleophilic base and, optionally, water.

Provided is a novel gel-like food composition. The gel-like food composition contains 0.1 to 10 wt % of a free branched-chain amino acid, 1 to 12 wt % of a protein, and 10⁴/g to 10¹⁴/g of a probiotic.

The invention relates to the use of an amorphous thermoplastic polyester for the production of optical articles, said thermoplastic polyester having at least one 1,4:3,6-dianhydrohexitol unit (A), at least one alicyclic diol unit (B) other than the 1,4:3,6-dianhydrohexitol units (A), at least one terephthalic acid unit (C), the molar ratio (A)/[(A)+(B)] being at least 0.32 and at most 0.90, said polyester being free of non-cyclic aliphatic diol units or comprising a molar amount of non-cyclic aliphatic diol units, relative to the total monomeric units in the polyester, of less than 5%, and with a reduced viscosity in solution (25° C.; phenol (50 wt. %): ortho-dichlorobenzene (50 wt. %); 5 g/L of polyester) greater than 50 mL/g.

The present invention aims to provide a polymeric material having reduced coloration in the visible light region, a high refractive index, and low optical dispersion. The present invention relates to a polymeric material having a sulfoxide structure in a main chain.

An industrially advantageous process for producing adamantane by which high-purity adamantane reduced in coloration is efficiently produced while minimizing the loss. The process, which is for producing adamantane by isomerizing trimethylenenorbornane, includes (A) a reaction step of isomerizing the starting material, (B) a concentration step of concentrating the adamantane contained in the resultant liquid reaction mixture, (C) a crystallization step of precipitating the concentrated adamantane, (D) a solid-liquid separation step of separating the adamantane crystals from the slurry resulting from the crystallization, (E) a washing step of washing the isolated adamantane crystals, and (F) a drying step of drying the adamantane crystals washed, characterized in that the mass ratio of the endo-trimethylenenorbornane to the adamantane each contained in the materials to be subjected to the crystallization step (C) (endo-trimethylenenorbornane/adamantane) is 0.25 or lower.