Longitudinal shrink films

Details Longitudinal shrink films Longitudinal shrink films

2005-05-24

2005-05-24

Nutter, Nathan M. (Department: 1711)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S241000

Reexamination Certificate

active

06897260

ABSTRACT:
A heat-shrinkable film and a method of its manufacture are provided. In an exemplary embodiment, a polystyrene film exhibits heat-induced growth in the cross direction of great than or equal to 5% with greater than or equal to 30% concomitant shrinkage in the machine direction. The films may comprise crystal polystyrene, high impact polystyrene, and/or elastomers. A method of manufacture is disclosed which includes a post-extrusion temperature conditioning step.

REFERENCES:
patent: 4463861 (1984-08-01), Tsubone et al.
patent: 5466499 (1995-11-01), Takagi et al.
patent: 5753326 (1998-05-01), Blackwelder
patent: 5756577 (1998-05-01), Gutierrez-Villarreal

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