Vinyl chloride polymerization with carboxylic acid ester of poly

Details Vinyl chloride polymerization with carboxylic acid ester of poly Vinyl chloride polymerization with carboxylic acid ester of poly

1996-09-09

1999-03-16

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526202, 526213, 526215, C08F 220

Patent

active

058832092

ABSTRACT:
The production process includes starting suspension polymerization of vinyl chloride-based monomer in a polymerization vessel in the presence of a particular combination of suspending agents; and, at the time when a polymerization conversion has reached 5 to 60%, further adding to the reaction mixture a partially saponified polyvinyl alcohol having an average polymerization degree of 1,500 to 4,000 and a saponification degree of 75 to 98 mole %, wherein a carboxylic acid ester of polyhydric alcohol is further added to at least one one selected from a content inside the polymerization vessel prior to the start of the polymerization, a content inside the polymerization vessel during the polymerization, and the resulting polymer. According to the process, there is obtained a vinyl chloride polymer having a large bulk specific gravity and a fast gelation rate, and from the polymer, a formed part small in both the number of fish eyes and the amount of residual monomer can be obtained.

REFERENCES:
patent: 4169819 (1979-10-01), Shiohara
patent: 4336176 (1982-06-01), Lindner
patent: 4695616 (1987-09-01), Caporossi
patent: 4797458 (1989-01-01), Sharaby
patent: 4940759 (1990-07-01), Yang

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