Polymer compositions and cast films

Details Polymer compositions and cast films Polymer compositions and cast films

1995-05-08

1997-10-07

Clark, W. Robinson H.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428524, 525240, 525322, 525324, C08L 2304, C08L 2316

Patent

active

056746300

ABSTRACT:
Polypropylene impact copolymer compositions are provided which contain a homopolymer phase of predominantly homopolymeric polypropylene, a copolymer phase of copolymerized ethylene and propylene, and a nucleating agent. The inventive compositions have a rubber content (Fc) in the range of 25 to 45% by weight, a crystallization temperature in the range of 122.degree. to 132.degree. C., a melt flow in the range of about 7 to about 60 dg/min, and a ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase of 1.4 to about 1.9. The polypropylene impact copolymer compositions may be used to form cast films which preferably are soft, quiet, and suitable for use in products to be used next to the skin, such as diapers, adult incontinence pads and feminine hygiene products.

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