Long-fiber-reinforced polypropylene compositions and door...

Details Long-fiber-reinforced polypropylene compositions and door... Long-fiber-reinforced polypropylene compositions and door...

2005-12-15

2008-10-28

Salvatore, Lynda (Department: 1794)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

C428S299100, C428S299400, C524S494000, C524S504000, C524S505000

Reexamination Certificate

active

07442435

ABSTRACT:
The present invention provides long-fiber reinforced polypropylene compositions comprising: (a) about 29-77 wt % of a crystalline polypropylene resin comprising about 50-100 wt % of a propylene homopolymer; (b) about 20-50 wt % of a long-fiber reinforcing material having an average fiber length of about 3-50 mm and an average diameter of about 4-30 μm; (c) about 2-20 wt % of an elastomer, a plastomer, or a mixture thereof having a melt index as measured at 190° C. of about 20-150 g/10 min, wherein said elastomer, plastomer, or mixture thereof was polymerized by a metallocene-based catalyst; and (d) about 0.01-3 wt % of a radical initiator, wherein the ratio of the melt index as measured at 230° C. of the crystalline polypropylene resin to the melt index as measured at 190° C. of the elastomer, the plastomer, or the mixture thereof is in the range of about 0.5 to about 10.

REFERENCES:
patent: 5985971 (1999-11-01), Srinivasan et al.
patent: 6627692 (2003-09-01), Saito et al.
patent: 6747094 (2004-06-01), Kinoshita et al.
patent: 2006/0135699 (2006-06-01), Li et al.
patent: 2003-147159 (2003-05-01), None

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