Method for preparing vinyl halide homopolymers having improved p

Details Method for preparing vinyl halide homopolymers having improved p Method for preparing vinyl halide homopolymers having improved p

1970-06-19

1976-05-11

Henderson, Christopher A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260897C, 526 79, 526344, 526 82, 526 86, C08F 111, C08F 180, C08F 330

Patent

active

039562514

ABSTRACT:
Vinyl halide homopolymers, particularly polyvinyl chloride, which exhibit improved processing characteristics without sacrificing physical properties are prepared by partially polymerizing a vinyl halide monomer at an initial temperature level whereupon the reaction temperature is then raised and the polymerization is continued at this increased temperature level preferably while in the presence of a chain transfer agent so as to obtain a polymer having an average molecular weight range different from that obtainable at the first reaction temperature. The resulting polyvinyl chloride provides the physical characteristics of polymer blends but can be processed much more readily than a mechanical blend of homopolymers of varying molecular weights, fusing more easily and without the undesirable formation of fish eyes.

REFERENCES:
patent: 2868762 (1959-01-01), Oukes
patent: 3022282 (1962-02-01), Marous
patent: 3033839 (1962-05-01), Heckmaier
patent: 3205204 (1965-09-01), Heckmaier
patent: 3287447 (1966-11-01), Faure
patent: 3468859 (1969-09-01), Davies

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