Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2006-01-12
2010-12-07
Seidleck, James (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
active
07847010
ABSTRACT:
Provided are a molding appearance modifier for resins capable of controlling appearance of large-sized molded parts only by small addition, and a polypropylene resin composition capable of providing good appearance to, for example, automobile exterior parts, and has excellent molding processability. The invention relates to a propylene block copolymer having a crystalline propylene polymer portion and a propylene•ethylene random copolymer portion, wherein the crystalline propylene polymer portion has an intrinsic viscosity [η]homoof 1.2 dl/g or less; the propylene•ethylene random copolymer portion has an ethylene content of 30 to 70 wt. %, has an intrinsic viscosity [η]copolyof 2.5 to 7.0 dl/g, and is added in an amount of 40 to 80 wt. % based on the whole propylene block copolymer; and the propylene block copolymer, in its entirety, has a melt flow rate of 0.1 to 10 g/10 min; and a [η]copoly/[η]homoratio falls within a range of 2.5 to 10; and a polypropylene resin composition using the propylene block copolymer as a molding appearance modifier.
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Mizukami Shigeo
Suzuki Akihiro
Zanka Yukihito
Japan Polypropylene Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Seidleck James
Valdez Deve
LandOfFree
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