Method for the preparation of a vinyl chloride-based polymer

Details Method for the preparation of a vinyl chloride-based polymer Method for the preparation of a vinyl chloride-based polymer

C - Chemistry, Metallurgy

08

F

C08F 2/20 (2006.01) C08F 14/06 (2006.01)

Patent

CA 2054865

-26- ABSTRACT OF THE DISCLOSURE An improvement is proposed for the method of suspension polymerization of vinyl chloride monomer or a monomer mixture mainly composed thereof to produce a polyvinyl chloride resin powder having excellent absorptivity of plasticizers and contain- ing a greatly decreased amount of fish eyes. The improvement con- sists in the use of a specific suspending agent which is a combina- tion of (a) a modified, partially saponified polyvinyl alcohol, of which the modifying monomeric unit is an ethylene unit having a pyrrolidone group, caprolatam group, oxazolidinone group or 5- methyloxazolidinone group as the modifying group and (b) a hydr- oxypropyl methyl cellulose of specified degrees of substitution of the methoxyl and hydroxypropoxyl groups and a specified viscosity of a 2% aqueous solution thereof. The improvement can be further enhanced by using, in addition to the above mentioned two, a third polymeric suspending agent which is a partially saponified polyvi- nyl alcohol of a low degree of saponifilcation and a low average degree of polymerization.

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