FOERFARANDE Foer FRAMSTAELLNING I MICRO SUSPENSION AV Homosexuals and KOPOLYMERLATEXER AV vinylchloride SOM KAN ANVAENDAS SOM YMPNINGSMEDEL.

摘要

A process for the preparation of a vinyl chloride polymer latex having particles with a mean diameter between about 0.2 and 0.8 mu m and containing at least one organosoluble polymerization initiator comprising dispersing in an aqueous reaction medium also containing parabenzoquinone, at least one monomer, at least one anionic emulsifier and optionally at least one nonionic emulsifier, and from about 0.004 to 0.16% by weight, with respect to said at least one monomer, of said initiator expressed in terms of active oxygen, polymerizing said at least one monomer at a desired polymerization temperature, theta 1, and continuously adding parabenzoquinone to said aqueous reaction medium during the polymerization when the temperature theta 2 of the reaction medium is such that the difference theta 2- theta 1 exceeds a value from 0 DEG to +5 DEG C. The invention also includes the resultant products and their use in seeded microsuspensions for the preparation of vinyl chloride polymers.