Propylene-ethylene block copolymer

Details Propylene-ethylene block copolymer Propylene-ethylene block copolymer

2005-06-14

2005-06-14

Seidleck, James J. (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...

C525S323000

Reexamination Certificate

active

06906143

ABSTRACT:
Disclosed is a propylene-ethylene block copolymer which is superior in stiffness, hardness and moldability and also in balance between toughness and low-temperature impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene random copolymer portion, wherein the propylene-ethylene block copolymer has a melt flow rate (MFR) of from 5 to 120 g/10 min.

REFERENCES:
patent: 5856400 (1999-01-01), Matsumura et al.
patent: 07-157626 (1995-06-01), None
patent: 07-157627 (1995-06-01), None
patent: 09-048831 (1997-02-01), None
patent: 09-067501 (1997-03-01), None

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