Method for polymerizing vinyl chloride with controlled water add

Details Method for polymerizing vinyl chloride with controlled water add Method for polymerizing vinyl chloride with controlled water add

1992-04-21

1993-08-10

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525 81, 525202, C08F 220

Patent

active

052350126

ABSTRACT:
An improved method for the suspension polymerization is proposed which gives a PVC resin product having an increased plasticizer absorptivity and greatly decreased content of fish eyes. The invention can be achieved by additionally adding a limited volume of water into the polymerization mixture under proceeding of the polymerization reaction within a specified period of 30 to 70% monomer conversion and at such a controlled rate as not to unduly decrease the pressure inside of the reactor. The improvements are particularly remarkable when the dispersing agent added to the polymerization mixture is a ternary combination of (A) a water-soluble partially saponified polyvinyl alcohol of a high degree of polymerization and a high degree of saponification, (B) a hydroxypropyl methyl cellulose having specified degrees of substitution with methoxy and hydroxypropoxy groups and specified viscosity characteristics and (C) a monomer-soluble partially saponified polyvinyl alcohol of a low degree of polymerization and a low degree of saponification, each in a specified amount.

REFERENCES:
patent: 3485808 (1969-12-01), Wiesner
patent: 4845174 (1989-07-01), Amano
patent: 5089575 (1992-02-01), Arima

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