IMPROVED MONOMER CONVERSION IN EMULSION POLYMERISATION Russian patent published in 2015 - IPC C08F2/22 C08F4/40 C08F236/10 

FIELD: chemistry.

SUBSTANCE: present invention relates to an improved method for redox-initiated emulsion polymerisation, which increases monomer conversion. Described is a method of increasing monomer conversion in redox-initiated emulsion polymerisation, wherein said method includes adding a composition containing an effective amount of substituted phenol to a polymerisation medium, wherein the substituted phenol is selected from a group consisting of 2,6-di-tert-butyl-para-cresol, 2,6-bis-(1,1-dimethylethyl)-4-methylphenol, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 3,5-bis-(1,1-dimethylethyl)-4-hydroxyphenyl-C₁₃-C₁₅-alkyl ether of benzenepropionic acid, Irganox 1520 (2,4-bis-[(octylthio)methyl]-ortho-cresol), Irganox 1010 (pentaerythritol-tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]) and mixtures thereof, wherein the effective amount of the substituted phenol ranges from 0.01 to 5 parts per 100 parts monomer. Also described is a method of producing emulsified rubber, which comprises: (1) reacting styrene and butadiene in the presence of soap, water, a modifier and an activator and (2) optionally stopping said reaction by a short-stopping agent, wherein the effective amount of substituted phenol is added to the reaction mixture at step (1) to form an emulsified butadiene-styrene polymer having low gel content and high monomer conversion, and wherein the substituted phenol is selected from a group consisting of 2,6-di-tert-butyl-para-cresol, 2,6-bis-(1,1-dimethylethyl)-4-methylphenol, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate, 3, 5-bis-(1,1-dimethylethyl)-4-hydroxyphenyl-C₁₃-C₁₅-alkyl ether of benzenepropionic acid, Irganox 1520 (2,4-bis-[(octylthio)methyl]-ortho-cresol), Irganox 1010 (pentaerythritol-tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate]), Irganox 1076 (octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and mixtures thereof, and wherein the effective amount of substituted phenol ranges from 0.01 to 5 parts per 100 parts monomer.

EFFECT: achieving high monomer conversion.

13 cl, 4 tbl, 3 ex