Method of molding a styrenic foam by extrusion

Details Method of molding a styrenic foam by extrusion Method of molding a styrenic foam by extrusion

1992-03-17

1994-06-28

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 405, 264 51, 264 53, 264 461, 264DIG5, B29C 6722

Patent

active

053244583

ABSTRACT:
The invention includes a blowing agent composition useful in the production of insulating styrenic foams comprising ethylchloride, propane and a halogenated ethane selected from the group consisting of 1,1,1-trifluoro-2-fluoroethane, 1-chloro-1,1-difluoro-2,2,2-trifluoroethane 1-chloro-1,1-difluoroethane (FC-142b) and mixtures thereof. The invention further includes a method to produce dimensionally stable insulating styrenic foams using the blowing agent composition by confining operating temperatures within a narrow range. The blowing agent composition has a significantly reduced ozone reactivity potential compared to previous commercial styrenic foam blowing agents.

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