Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1975-10-06
1978-03-14
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 54, 264 55, 264DIG60, B29D 2700
Patent
active
040791076
ABSTRACT:
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.degree. to 180.degree. C. for 1 to 2 hours. The plastigel or plastisol is cooled, at an unchanged closing force of the press of said pressure mold, to a temperature of 20.degree. to 70.degree. C. The plastigel or plastisol is removed from the pressure mold, a crude foam plastic forming. The crude foam plastic is heated under a gas pressure of 2 to 10 atm. to a temperature of 140.degree. to 170.degree. C. The crude foam plastic is cooled at said pressure of 2 to 10 atm. to a temperature of 100.degree. to 130.degree. C. The pressure is lowered to atmospheric pressure, the foam plastic simultaneous expanding. The resultant foam plastic will not shrink or expand more than 5 percent after storage for one week at 60.degree. C.
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patent: 2525965 (1950-10-01), Smith
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patent: 2751627 (1956-06-01), Lindemann
patent: 2768407 (1956-10-01), Lindemann
Platzer, Norbert A. J. "Plasticization and Plasticizer Processes," Norbert A. J. Platzer, Symposium Chairman, Washington, D. C., American Chemical Society, 1965, pp. 146-152.
Brunner Emil
Huber Alfred
Anderson Philip
Lonza Ltd.
Marsh Virgil H.
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