Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1990-10-15
1992-05-19
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521134, 521139, 521140, C08J 910
Patent
active
051149877
ABSTRACT:
A process for preparing foamed polymer blends of thermoplastic polymers with elastomeric polymers comprises mixing the elastomeric polymers with a chemical blowing agent and compounding additives. The mixture is then combined with a thermoplastic polymer to form a blend, and thereafter mixed with a curing system and a blowing agent activator. The curable composition thus prepared can subsequently be blown in either a one or two-step process. The two-step process entails partially curing the elastomer in the composition at a lower temperature, and then blowing the composition at a higher temperature. The one-step process involves (a) heating the composition to the higher temperature initially, thereby initiating curing, and after an activating induction period of the blowing agent, producing blowing; or (b) curing and blowing the composition by extruding it through an extruder. In both processes, the elastomer present in the blend is sufficiently cured prior to blowing to prevent the escape of the blowing bubbles, but not to the extent that bubble formation is prevented.
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Cakmak Mukerrem
Dutta Anit
Edison Polymer Innovation Corp.
Foelak Morton
Hochberg D. Peter
Kusner Mark
Weisz Louis J.
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