Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1991-10-15
1993-08-31
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 50, 264 54, 264 55, 264DIG5, 264DIG9, B29C 6722
Patent
active
052406571
ABSTRACT:
A method for making low density (0.8-2 lb/cu.ft.) expanded polymeric products uses blowing agent in an amount of only from 2 to 4.4 weight percent, the process emitting blowing agent during processing in an amount of from only about 0.3 to about 2.5 weight percent. The process uses 2 to 5 expansion steps together with a polymer having a particular polydispersity, weight average molecular weight and M.sub.z :M.sub.n, this polymer having a greater expandability than conventional polymers. The process requires only about half of the amount of blowing agent currently being used in commercially viable processes for making expanded polystyrene products. The process can be used with or without a molding step.
REFERENCES:
patent: 2958905 (1960-11-01), Newberg et al.
patent: 3042973 (1962-07-01), Brockhues et al.
patent: 3054146 (1962-09-01), Griffin
patent: 3056753 (1962-10-01), Fronko
patent: 3126432 (1964-03-01), Schuur
patent: 3192169 (1965-06-01), Doak
patent: 3631133 (1971-12-01), Battigelli
patent: 3696060 (1972-10-01), Burt
patent: 4418156 (1983-11-01), Rigler et al.
patent: 4419458 (1983-12-01), Rigler et al.
patent: 4430449 (1984-02-01), Digiulio
patent: 4485193 (1984-11-01), Rubens et al.
patent: 4497911 (1985-02-01), Rigler et al.
patent: 4513105 (1985-04-01), Hahn et al.
patent: 4585605 (1986-04-01), Kadota et al.
patent: 4777000 (1988-10-01), Kuwabara et al.
patent: 4925606 (1990-05-01), Francis et al.
patent: 5010111 (1991-04-01), Hahn et al.
patent: 5086078 (1992-02-01), Harclerode et al.
patent: 5110524 (1992-05-01), Harclerode et al.
patent: 5110836 (1992-05-01), Harclerode et al.
patent: 5110837 (1992-05-01), Harclerode et al.
patent: 5112875 (1992-05-01), Zimmermann et al.
patent: 5114640 (1992-05-01), Harclerode et al.
patent: 5115066 (1992-05-01), Zimmermann et al.
Tock, "Expandable Polystyrene Beads: Preexpansion Processing," Advances in Polymer Technology, pp. 241-254 (1984).
Frisch, et al., "Plastic Foams," Part II Marcel Decker, Inc., New York 1973 pp. 538-551.
Harclerode William H.
Knutsen John C.
Pekich Barry J.
Voss John C.
Wiman John V.
BASF Corporation
Carmen Dennis V.
Kuhns Allan R.
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