C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/64, 18/672
C08J 9/00 (2006.01) C08J 9/06 (2006.01)
Patent
CA 1068463
Abstract of the Disclosure The process for the production of closed-cell, extra soft polyvinylchloride foam plastics having improved volume stability at elevated temperatures. The process includes heating a plastisol or plastigel comprised of a plasticizer and foaming agent containing polyvinyl chloride or vinyl chloride copolymerizate in a pressure mold at a pressure of up to 300 atm. to a temperature of 150° to 180°C. The plastigel or plastisol is cooled, at an unchanged closing force of the press of said pressure mold, to a temperature of 20° to 70°C. The cooled plastigel or plastisol is removed from the pressure mold, as a crude foam plastic preform. The crude foam plastic preform is heated under a gas pressure of 2 to 10 atm. to a temperature of 140 to 170°C. The crude foam plastic preform is cooled at said pressure of 2 to 10 atm. to a temperature of 100° to 130°C. The pressure is lowered to atmospheric pressure, the foam plastic simultaneously expanding. The resultant foam plastic will not shrink or expand more than 5 percent after storage for one week at 60°C.
236984
Brunner Emil
Huber Alfred
Lonza Ltd.
Na
LandOfFree
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