Propylene block copolymer

Details Propylene block copolymer Propylene block copolymer

1998-07-28

2000-09-12

Seidleck, James J.

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

Synthetic resins

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

525240, 525247, 525322, 525268, C08L 2316

Patent

active

061179469

ABSTRACT:
A propylene block copolymer having a specified composition and consisting of a xylene soluble portion at 20.degree. C. in an amount of 5 wt % or more and a portion excluding the CXS portion, the melting temperature of the CXIS portion measured by a differential scanning caloriemeter being 130 to 155.degree. C., wherein the difference in transparency in terms of haze between prior to and posterior to the 1-hour treatment at 110.degree. C of a 150 .mu.m thick film obtained by forming said copolymer into a film by extrusion is 8% or less.
According to the present invention, a block copolymer having a good transparency and improved impact resistance at a low temperature, and further exhibiting less bleeding at high-temperature heat treatment, can be provided.

REFERENCES:
patent: 5654372 (1997-08-01), Sadatoshi et al.
patent: 5780168 (1998-07-01), Satoh et al.

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