Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1980-04-10
1982-07-13
Anderson, Philip
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 25, 264 51, 264230, 264321, 264DIG71, 521139, 525170, 525240, B29D 2700
Patent
active
043395511
ABSTRACT:
This invention relates to a thermoplastic, foam composition having enhanced heat-shrink capability by the physical intermixing therein of a minor amount of a second polymeric material having superior infrared absorbing properties. The intermixed composition is able to be foamed and formed into an oriented sheet adapted to fabricating heat-shrink tubular labels or sleeves, for example, having improved thermal contraction properties when subjected to infrared radiation. The subject composition is thus able to provide markedly improved heat shrinkage at lower temperatures than heretofore required for a variety of fabricated products. Polyethylene foam or polystyrene foam can be taken as the thermoplastic base material having a minor amount of a second polymeric material such as polyethylene terephthalate dispersed therein, the latter having a high absorbing capability for infrared energy. The present invention also includes the method of improving the heat-shrink capability of a heat-shrinkable thermoplastic polyolefin film and foam-making material.
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Anderson Philip
Click M. E.
Holler E. J.
Owens--Illinois, Inc.
Wilson D. H.
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