Vinyl chloride latex polymers with diter-butyl-p-cresol as polym

Details Vinyl chloride latex polymers with diter-butyl-p-cresol as polym Vinyl chloride latex polymers with diter-butyl-p-cresol as polym

1987-03-24

1989-09-19

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526225, C08F 226

Patent

active

048682586

ABSTRACT:
The improvement in a process for the preparation of latexes of homo- and co-polymers of vinyl chloride, with particles having a mean diameter between 0.2 and 0.8 .mu.m and containing at least one organosoluble polymerization initiator, by polymerization in microsuspension of the corresponding monomer or monomers, according to which a fine dispersion of the monomer or monomers is formed in an aqueous medium containing at least one anionic emulsifying agent or at least one anionic emulsifying agent and at least one nonionic emulsifying agent, in the presence of 0.004 to 0.16% by weight; in relation to the weight of the monomer or monomers, of said initiator expressed as active oxygen and then the thus formed reaction medium is subjected to polymerization at the desired polymerization temperature (.theta..sub.1); the improvement comprising adding to the aqueous medium 2,6-ditert.-butylpara-cresol prior to forming the dispersion of the monomer or monomers and during the course of the polymerization adding 2,6-ditert.-butyl-para-cresol, in continuous manner, to the reaction medium, when the temperature of the reaction medium (.theta..sub.2) is such that the temperature difference .theta..sub.2 -.theta..sub.1 is above a value selected in the interval going from 0.degree. to +5.degree. C. and preferably from 0.degree. to +2.degree. C.

REFERENCES:
patent: 2662867 (1953-12-01), Hoertz
patent: 4180634 (1979-12-01), Koyanagi
patent: 4401798 (1983-08-01), Ceprini
patent: 4478986 (1984-10-01), Reid
patent: 4482684 (1984-11-01), Gardner
patent: 4654392 (1987-03-01), Marshall

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