Blends of polypropylene impact copolymer with other polymers

Details Blends of polypropylene impact copolymer with other polymers Blends of polypropylene impact copolymer with other polymers

2007-03-21

2008-11-11

Nutter, Nathan M (Department: 1796)

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

Synthetic resins

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

C525S240000

Reexamination Certificate

active

07449522

ABSTRACT:
It has been discovered that the properties of sheet or film materials of broad molecular weight distribution ethylene/propylene rubber impact-modified heterophasic copolymer (ICP) can be improved by blending the ICP with a second polyolefin. The second polyolefin may be a syndiotactic polypropylene (sPP), a random copolymer (RCP) of propylene and comonomer (e.g. ethylene and/or butene) made using a Ziegler-Natta or metallocene catalyst, medium density polyethylene (MDPE), linear low density polyethylene (LLDPE), or low crystalline copolymer of propylene/α-olefin. Improvements include, but are not necessarily limited to, reduced motor amps, lower secant modulus, increased dart drop strength, increased gloss, reduced haze, increased elongation to yield, elimination of stress whitening, improved puncture resistance, and decreased seal initiation temperature. This sheet of film materials may be co-extruded with other resins or laminated with other materials after extrusion.

REFERENCES:
patent: 5641848 (1997-06-01), Giacobbe et al.
patent: 6072005 (2000-06-01), Kobylivker et al.
patent: 6599971 (2003-07-01), Dotson et al.
patent: 2005/0234172 (2005-10-01), Musgrave et al.
patent: 2006/0008666 (2006-01-01), Miller et al.

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