Process for producing vinyl chlorine resin with nonionic surfact

Details Process for producing vinyl chlorine resin with nonionic surfact Process for producing vinyl chlorine resin with nonionic surfact

1987-07-31

1988-09-13

Henderson, Christopher

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

Synthetic resins

Polymerizing in two or more physically distinct zones

526209, 5263442, C08F 230

Patent

active

047711140

ABSTRACT:
The present invention provides a process for producing vinyl chloride resin in suspension polymerization of vinyl chloride monomer by the use of a polymerization reactor equipped with a reflux condenser wherein a nonionic surface active agent having a HLB value of 6-14 is added upon initial charging of reactants, polymerization is started in a range of 0.8 to 1.0 of the water/monomer ratio, the polymerization temperature is raised 3.degree. to 10.degree. C. when polymer conversion is not more the 50 weight percent, with water being added in the course of polymerization to not more than make up for the volumetrical contraction resulting from the progress of polymerization so that upon completion of polymerization the water/monomer ratio is controlled in a range of 1.0 to 1.4. The polyvinyl chloride resin obtained by the present process is superior in quality such as high bulk density and little fish eye content with high productivity.

REFERENCES:
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patent: 4061848 (1977-12-01), Sistig et al.
patent: 4455413 (1984-06-01), Tomishima et al.
patent: 4487899 (1984-12-01), White
patent: 4588791 (1986-05-01), Bieringer

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