Internally stabilized vinyl chloride polymers comprising calcium

Details Internally stabilized vinyl chloride polymers comprising calcium Internally stabilized vinyl chloride polymers comprising calcium

1978-09-14

1979-12-11

Lilling, Herbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

260 23AR, 260 285D, 526 74, 526 75, 526200, 526214, 526218, 526221, 5262305, 526273, 526317, C08F 3004, C08F23004

Patent

active

041784235

ABSTRACT:
Polymerization of vinyl chloride monomer, by either suspension or emulsion polymerization, optionally in the presence of a monoethylenically unsaturated comonomer, is carried out in the presence of a mixture of calcium and zinc acrylate. The presence of the calcium and zinc acrylate yields a more thermally stable product and reduces the amount of polymer scale formation during polymerization. A further improvement in thermal stability is achieved by conducting the polymerization with the added presence of an epoxy compound containing a reactive vinyl or allyl group.

REFERENCES:
patent: 2147154 (1939-02-01), Fikenstscher et al.
patent: 3705137 (1972-12-01), Kuwahara et al.
patent: 3803267 (1974-04-01), Kuwahara
"Stabilization of Polymers & Stabilizers Processes," Norman A. J. Platzer, Adv. in Chem. Series #85 ACS, (1965), pp. 72 & 81.
C.A. (75) 22 130492W, Suzuki et al., Thermally Stable U. C. Resins.
C.A. 8314115388P, Kawasumi et al., "Vinyl Chloride Polymers".
C.A. 8310080261N, Kawasumi et al., "Heat-Stable VCl Copolymers".

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