초록 ▼

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 or

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.

대표청구항 ▼

As an article of manufacture, a biaxially-oriented heat-shrinkable film or foam sheet having improved heat-shrink capability comprising a first thermoplastic polyolefin film-making base material in major amount and a different second thermoplastic polymeric material having superior infrared radiatio

As an article of manufacture, a biaxially-oriented heat-shrinkable film or foam sheet having improved heat-shrink capability comprising a first thermoplastic polyolefin film-making base material in major amount and a different second thermoplastic polymeric material having superior infrared radiation absorbing properties in minor amount, said biaxially-oriented film or foam sheet having improved heat-shrink capability, upon subjection to heating including a substantial portion of infrared radiation, said improvement including a reduction in the extent of time and the amount of heat required to heat-shrink said biaxially-oriented film or foam sheet which is less than that required to heat-shrink a biaxially-oriented film or foam sheet of said first polyolefin base material and which is free of said second polymeric material. The article of manufacture in accordance with claim 13 wherein said polyolefin base material comprises low density polyethylene.