Process for producing vinyl chloride polymer

Details Process for producing vinyl chloride polymer Process for producing vinyl chloride polymer

1991-10-04

1995-09-05

Zitomer, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526321, 526340, 5263401, 526344, 5263442, 526345, C08F 220, C08F21406

Patent

active

054480043

ABSTRACT:
A process for producing a vinyl chloride polymer for matted moldings which comprises performing the suspension polymerization of vinyl chloride monomer or a mixture of vinyl monomers composed mainly of vinyl chloride in an aqueous medium, said suspension polymerization being performed after the addition of a dispersion obtained by dispersing a polyfunctional monomer having 2 or more ethylenic double bonds in the molecule into a solution containing a partially saponified polyvinyl alcohol having a degree of saponification of 25 to 65 mole % and an average degree of polymerization of 150 to 1000, thereby yielding a vinyl chloride resin composed of 5 to 90 wt % tetrahydrofuran-insoluble gel fraction, with the remainder being tetrahyrofuran-solubles.

REFERENCES:
patent: 3166534 (1965-01-01), Perrins
patent: 3763123 (1973-10-01), Waterman
patent: 4816539 (1989-03-01), Watanabe
patent: 4910273 (1990-03-01), Amano

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