Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1985-09-20
1987-07-21
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG5, 264DIG18, 521 79, 521 81, 521 91, 521146, 521154, 521918, C08V 914
Patent
active
046817158
ABSTRACT:
A steam expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms, the secondary blowing agent having a normal atmospherpic boiling point of from about 0.degree. to about 100.degree. C. The composition may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with volatile blowing agent.
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patent: 4452751 (1984-06-01), McCullough et al.
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Garcia Gerald A.
Park Chung P.
Foelak Morton
Kanuch B. M.
The Dow Chemical Company
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