- Preparation method of organosilicon monomer compound
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The invention relates to a preparation method of an organosilicon monomer compound. According to the preparation method, allyl glycidyl ether is used as a raw material and subjected to epoxy ring-opening substitution, hydrosilylation and a substitution esterification reaction to obtain the target compound. The method comprises the following steps: (1) subjecting an initial raw material to reacting with an alkali metal halide under the condition of a phase transfer catalyst to obtain an intermediate beta-halohydrin; (2) carrying out addition on the intermediate beta-halohydrin and bis(trimethylsiloxy)methylsilane under the catalysis of chloroplatinic acid to obtain an intermediate II; and (3) substituting the intermediate II with methacrylate to obtain a final compound. According to the above reaction synthesis route, generation of a large number of isomers in an existing method can be avoided, production of impurities is avoided in the aspect of reaction route design, and then, high-purity monomer is obtained.
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Paragraph 0046; 0051-0053; 0056
(2021/04/28)
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- METHOD FOR PRODUCING SILICONE MONOMER
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To provide a method for purifying a polymerizable group-containing silicone monomer which can obtain a high-purity silicone monomer without causing gellation and increasing viscosity in concentrating and distilling a polymerizable group-containing silicone monomer.SOLUTION: There is provided a method for purifying a silicone monomer which comprises (A) a step of concentrating a solution containing a silicone monomer represented by the following formulas (1-a) or (1-b) (R1 is H or a methyl group; and A is a monovalent organo(poly)siloxanyl group-containing organic group), and (B) a step of subjecting the concentrated liquid obtained in (A) to reduced-pressure distillation, wherein a specific polymerization inhibitor is added before any one of the steps (A) and (B).SELECTED DRAWING: None
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Paragraph 0037
(2021/03/03)
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- SILICONE COMPOUND PRODUCTION METHOD
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PROBLEM TO BE SOLVED: To provide a polymerizable group-containing silicone monomer production method for realizing a high-purity silicone monomer by inhibiting generation of silylation products of impurities in a reaction stage of synthesis. SOLUTION: The production method comprises reacting an epoxy-containing organopolysiloxane represented by the general formula (1) in the figure (n is an integer from 1 to 10, and A is a siloxanyl group) with an acrylic or methacrylic acid in the presence of a transition metal Lewis acid. SELECTED DRAWING: None COPYRIGHT: (C)2022,JPOandINPIT
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Paragraph 0035-0040
(2021/10/13)
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- METHOD FOR PRODUCING SILOXANE
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PROBLEM TO BE SOLVED: To provide a method for producing a siloxane compound suitable for a medical material. SOLUTION: There is produced a siloxane of the following formula (1) by reacting an epoxy compound represented by the following formula (5) and a (meth)acrylic acid. A is a group represented by the following formula (2) or the like. SELECTED DRAWING: None COPYRIGHT: (C)2021,JPOandINPIT
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Paragraph 0050; 0052; 0054-0056
(2021/01/21)
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- METHODS FOR PURIFYING SILOXANYL MONOMERS
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Disclosed are reduced pressure distillation methods for purifying siloxanyl monomers in the presence of at least one polymerization inhibitor. In further aspects, the polymerization inhibitor can be an alkylhydroguinone or a hydroxynaphthalene. Also disclosed are compounds purified by the disclosed methods and polymers produced therefrom.
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Page/Page column 26-27
(2008/12/06)
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- HYDROLYSIS-RESISTANT SILICONE COMPOUNDS
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In one aspect, the invention relates to hydrolysis-resistant silicone compounds. In particular, disclosed are sterically hindered hydrolysis-resistant silicone compounds and improved purity hydrolysis-resistant silicone compounds. Also disclosed are processes for making hydrolysis-resistant silicone compounds; the products of the disclosed processes; compositions and polymers comprising the disclosed compounds and products of the disclosed processes; and ophthalmic lenses, for example contact lenses, intraocular lenses, artificial cornea, and spectacle lenses, comprising the disclosed compositions, disclosed polymers, disclosed compounds, and products of the disclosed processes. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
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Page/Page column 56
(2008/06/13)
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- Process for the production of (trimethylsilyloxy)silylalkylglycerol methacrylates
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The present invention relates to a process comprising the steps of reacting in the presence of a hydrosilylation catalyst, a first reaction mixture comprising a free radical reactive compound and a silicon containing compound to form a silicon substituted glyceryl (meth)acrylate.
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Page/Page column 6
(2010/10/20)
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- SILICONE COMPOUND AND PROCESS FOR PRODUCING THE SAME
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This invention provides a process for producing of a silicone compound which includes a synthesis reaction of a silicone compound represented by the following formulas (a) and/or (a'), by reacting a carboxylic acid represented by the following formula (a2) to an epoxy silane represented by the following formula (a1) in presence of a metal salt of the carboxylic acid represented by the general formula (a2), characterized in that the reaction is carried out in presence of 0.05 wt% or more water in said reaction system. (Here, A denotes siloxanyl group. R1 denotes a substituent with 1 to 20 carbons having a polymerizable group. R2 to R4 respectively and independently denote hydrogen, a substituted or unsubstituted substituent with 1 to 20 carbons, or -X-A. X denotes a substituted or unsubstituted divalent substituent with 1 to 20 carbons.)
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Page/Page column 10-11
(2008/06/13)
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- PROCESS FOR THE PRODUCTION OF BIS(TRIMETHYLSILOXY)SILYLALKYLGLYCEROL METHACRYLATES
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The present invention relates to a process comprising the steps of reacting a substituted epoxide, and preferably a silicone containing substituted epoxide with at least one lithium acrylic acid salt, at least one acrylic acid and optionally at least one inhibitor at a temperature above about 60°C to form a substituted hydroxy acrylate.
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Page/Page column 9
(2008/06/13)
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- PROCESS FOR THE PRODUCTION OF BIS(TRIMETHYLSILYLOXY)SILYLALKYLGLYCEROL METHACRYLATES
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The present invention relates to a process for producing substituted glycerol acrylates from substituted epoxides. More specifically, the present invention relates to a process comprising the steps of (a) reacting a first reaction mixture comprising substituted epoxide with at least one epoxide opening catalyst and at least one acrylic acid to form a first reaction product comprising between about 60 and about 85 mole % substituted glycerol acrylate and said substituted epoxide; (b) treating said first reaction mixture with a nucleophilic compound to form a second reaction product which is substantially free of said substituted epoxide and which comprises said substituted glycerol acrylate and a nucleophile derivative of said substituted epoxide; and (c) treating said second reaction product to remove said nucleophile derivative and produce substituted glycerol acrylate having less than about 5 weight % difunctional impurities.
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