Impact modifiers for polyvinyl chloride

Details Impact modifiers for polyvinyl chloride Impact modifiers for polyvinyl chloride

1976-03-30

1978-09-05

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 4575W, 260876R, 260881, 260898, 260899, 526 80, 526 87, 526328, 526342, 526347, C08L 2512, C08L 2706, C08L 2514, C08L 3506

Patent

active

041118766

ABSTRACT:
A poly(vinyl chloride) resin composition comprised of an admixture of poly(vinyl chloride) resin and a clear or translucent polymeric material comprised of a non-uniform copolymer comprised of acrylonitrile, styrene and acrylate ester. The clear polymeric ASA material is a good impact modifier for PVC. The admixture contains from 3 to 15 percent by weight, based on the admixture, of the clear polymeric material. The clear polymeric material has a weight ratio of acrylonitrile and styrene acrylonitrile, styrene and acrylate ester which is between about 40 to 60 and about 60 to 40. The PVC resin combination, in dry form, can be conventionally hot processed or fabricated.
The non-uniform polymer is prepared by the process which comprises introducing at least one primary polymerizable feed composition, selected from the group of monomers consisting of styrene, acrylonitrile, acrylate ester, and a mixture of two or more of such monomers, from at least one primary feed source to a polymerization zone, the primary polymerizable feed composition continually varying in compositional content of the polymerizable reactants therein during the continuous introduction; simultaneously adding to the primary feed source at least one different secondary polymerizable feed composition, selected from the group of monomers consisting of styrene, acrylonitrile, acrylate ester and a mixture of two or more of such monomers, from at least one secondary feed source so as to continually change the compositional content of the polymerizable reactants of the primary polymerizable feed composition in the primary feed source; and continuously polymerizing the primary polymerization feed composition introduced to the polymerization zone until the desired polymerizable has been achieved, the primary polymerizable feed composition being different from the secondary polymerizable feed composition.

REFERENCES:
patent: 2420330 (1947-05-01), Shriver et al.
patent: 3448175 (1969-06-01), Doak et al.
patent: 3678133 (1972-07-01), Ryan
patent: 3681475 (1972-08-01), Spilner
patent: 3804881 (1974-04-01), Bassett et al.

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