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US 3,940,456 AGranted
Thermoplastic composition comprising PVC and chlorinated polyethylene
AssigneeHoechst Aktiengesellschaft
InventorsHans-Helmut Frey, Helmut Klug
Life of this patent
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Abstract
Blends of vinyl chloride polymers and chlorination products of polyolefins well suitable for dry blend technique are obtained by using a chlorinated low pressure polyethylene prepared by chlorinating in water in the presence of silicic acid and a siloxane oil.
Claims6
Thermoplastic composition essentially consisting of
- a. 98 to 50% by weight of a vinyl chloride polymer and
- b. 2 to 50% by weight of a chlorinated low pressure polyethylene having a chlorine content of 25 to 42% by weight, a reduced specific viscosity of 1 to 5 dl/g, a residue value of 2 to 40%, measured by extraction in a 1 :
- 1 mixture of toluene and acetone, and a swelling value of 10 to 70%, measured in methylcyclohexane, the chloro-polyethylene being prepared by chlorination of low pressure polyethylene in water in the presence of 0.1 to 2% by weight of silicic acid and 0.01 to 1.0% by weight of siloxane oil consisting of the recurring unit ##EQU2## in which R.sub.1 and R.sub.2 each represent an alkyl radical, an aryl radical or an aralkyl radical, and x is an integer of from 10 to 10,000 the percentages being calculated on the polyethylene, at a chlorination temperature of from 50.degree.C to 130.degree.C, at least 10% by weight of the chlorine being incorporated at a temperature of from 120.degree. to 130.degree.C.
Process for the manufacture of a thermoplastic composition by mixing
- a. 98 to 50% by weight of a vinyl chloride polymer and
- b. 2 to 50% by weight of a chlorinated low pressure polyethylene wherein the low pressure polyethylene has a chlorine content of 25 to 42% by weight, a reduced specific viscosity of 1 to 5 dl/g, a residue value of 2 to 40%, measured by extraction in a 1 :
- 1 mixture of toluene and acetone, and a swelling value of 10 to 70%, measured in methylcyclohexane, and is prepared by chlorination in water in the presence of 0.1 to 2% by weight of silicic acid and 0.01 to 1.0% by weight of siloxane oil consisting of the recurring unit ##EQU3## in which R.sub.1 and R.sub.2 each represent an alkyl radical, an aryl radical or an aralkyl radical, and x is an integer of from 10 to 10,000, the percentages being calculated on the polyethylene used, at a chlorination temperature of from 50.degree. to 130.degree.C, at least 10% by weight of the chlorine being incorporated at a temperature of from 120.degree. to 130.degree.C.
Dependencies are inferred from the claim text.