Thermoplastic composition comprising vinyl chloride polymer and two chlorinated polyethylenes

Claim 1

Thermoplastic composition consisting essentially of (A) 95-80% by weight of vinyl chloride polymer and (B) 5-20% by weight of chlorinated polyethylenes, each time calculated on the thermoplastic composition, wherein component (A) is a vinyl chloride polymer with a K value of from 55-65, and component B is a mixture of (B 1 ) 2.5-15 parts by weight of a chlorinated low pressure polyethylene, having a chlorine content of from 37-42% by weight, a residue value of from 0-30% (measured by extraction with toluene/acetone 1:1) and a swelling value of from 10-70% (measured in methyl cyclohexane) and which has been prepared by chlorination of a low pressure polyethylene of a density of from 0.940-0.955 g/cm 3 and a melt flow index MFI 190/5 of from 0.1-5 g/10 min in suspension in water or in 10-35% hydrochloric acid in the presence of 0-2% by weight of silicic acid and 0-1% by weight of silicone oil, relative, each time, to the polyethylene used, at temperatures between 50° and 130° C., with at least 10% of chlorine being introduced at temperatures between 120° and 130° C. and (B 2 ) 2.5-15 parts by weight of a chlorinated low pressure polyethylene with a chlorine content of from 37-42% by weight, a residue value of 50-70% and a swelling value below 1% and which has been prepared from a low pressure polyethylene with a density between 0.955 and 0.965 g/cm 3 and a melt flow index MFI 190/5 of from 20-65 g/10 min by chlorination in suspension in water or in 10-35% hydrochloric acid in the presence of 0-2% by weight of silicic acid and 0-1% by weight of silicone oil, each time calculated on the polyethylene used, at temperatures between 50° and 120° C., while introducing at least the last 10% of chlorine at a temperature of from 110° to 120° C.