Moldable shrunken thermoplastic polymer foam beads

Details Moldable shrunken thermoplastic polymer foam beads Moldable shrunken thermoplastic polymer foam beads

1989-01-10

1991-06-25

Foelak, Morton

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

Synthetic resins

From carbohydrate or derivative as a reactant

521 56, 521 58, 521 59, 521182, 521184, 521189, C08J 9224, C08J 9232

Patent

active

050267361

ABSTRACT:
Moldable shrunken foam beads comprising a foamable thermoplastic polymer, preferably a silane-crosslinked polyolefin foam, are produced by mixing a composition comprising a silane-modified polyolefin (such as a silane-grafted polyethylene) and a silanol condensation catalyst in an extruder to produce a melt, then projecting a blowing agent into the melt at a rate effective to produce a desired foam density in the extrudate; extruding and cutting the melt to form foam beads; allowing the beads to shrink; and exposing the foam beads to moisture to produce silane crosslinking of the polyolefin foam. In certain other embodiments the crosslinking of the thermoplastic polymer can be omitted, and/or shrinkage of the beads produced by vacuum treatment.

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