Method for producing polyester foam

Details Method for producing polyester foam Method for producing polyester foam

1996-11-05

1997-10-28

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 98, 521182, C08J 914

Patent

active

056818653

ABSTRACT:
Low density PET foam is extruded by heating PET resin above the crystalline melt point to melt the resin, combining Heptane as the blowing agent with the PET resin to create a mixture, cooling the mixture to a temperature of less than 538.degree. K., and extruding the foam through a die. The Heptane is about 0.5-5% by weight of the mixture, and preferably about 1-3%.

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