Method of preparation of copolymers of vinyl chloride at a low content of vinyl chloride free

摘要

P process for the preparation of vinyl chloride copolymers in aqueous emulsion with a low content of residual monomer, in the presence of 0,1 to 10% by weight of emulsifying agents and / or of 0,1 to 5% by weight of the protective colloids, and from 0,05 to 2% by weight of free radicals. / p & & p & is relaxed, the autoclave, after the pressure drop due to the post - polymerization, it sweeps the gaseous space surmounting the mixture of polymerization in order to eliminate the monomer, it cools the emulsion of 10 to 40 degrees c. at a temperature compnse between 10 and 40°C. and added to this temperature of the redox catalysts composed of oil-soluble peroxide compounds, in a proportion of 0,002 to 0,5% by weight, preferably of 0,01 to 0,1% with respect to the dispersion, as well as a reducer sulphide water-soluble, in a ratio as equivalents of the reducer to the peroxide compound of 0,5 to 3, and is allowed to stand for 2 hours at 2 days). / p