318473-48-2Relevant academic research and scientific papers
METHOD FOR PRODUCING SILICONE MONOMER
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Paragraph 0037, (2021/03/03)
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
SILICONE COMPOUND PRODUCTION METHOD
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Paragraph 0035-0040, (2021/10/13)
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
METHODS FOR PURIFYING SILOXANYL MONOMERS
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Page/Page column 26-27, (2008/12/06)
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.
SILICONE COMPOUND AND PROCESS FOR PRODUCING THE SAME
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Page/Page column 10-11, (2008/06/13)
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.)
