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US 4,228,264 AGranted
Suspension polymerization of vinyl chloride using hydroxyacrylic polymers
AssigneeNissan Chemical Industries, Ltd.
InventorsAkira Yamamoto, Masaru Iida, Satoru Miyake, Hideo Yamaura, Takeshi Inoue
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Abstract
A method of suspension polymerization is carried out by dispersing vinyl chloride in an aqueous medium in the presence of an oil soluble catalyst for polymerization and a polymerization improver having units ##STR1## wherein M represents hydrogen atom or an alkali metal; R represents --H, --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7 or --C.sub.4 H.sub.9 and n represents an integer of 10 to 1500.
Claims6
A method of suspension polymerization of vinyl chloride or vinyl chloride with a comonomer, which comprises:
- polymerizing said vinyl chloride or vinyl chloride with a comonomer in an aqueous medium in the presence of a combination of a polymerization improver having units of the formula:
- ##STR4## wherein M represents an alkali metal;
- R represents hydrogen, methyl, ethyl, propyl or butyl and
- n represents an integer of 10 to 1500, and a suspending agent selected from the group consisting of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, partially hydrolyzed polyvinyl acetate, styrene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, partially hydrolyzed polyacrylic acid ester, polymethacrylic acid ester, gelatin, and starch, the amount of said polymerization improver ranging from 0.00005 to 0.1 parts by wt. per 100 parts by wt. of total monomer and from 0.05 to 100 parts by wt. per 100 parts by wt of the suspending agent.
1 more element
Dependencies are inferred from the claim text.