Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Reexamination Certificate
2003-12-03
2004-09-28
Dixon, Merrick (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
C428S213000, C428S332000, C428S364000, C428S388000
Reexamination Certificate
active
06797363
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fiber/resin composite and a molded article obtained by molding the same. In particular, the present invention relates to a fiber reinforced molded resin article having a high impact strength and to a fiber/resin composite which is suitable as a raw material of the fiber reinforced molded resin article.
2. Description of the Related Art
Fiber-reinforced resin is an industrial material excellent in stiffness and heat resistance. Techniques for improving the impact resistance of the fiber reinforced resin are known. For example, JP-A-2002-241557 discloses a long fiber-reinforced propylene polymer composition, as a material which is capable of yielding molded articles of excellent mechanical strength, stiffness, impact resistance and endurance, that is composed of a composition made up of a modified propylene polymer which results from a modification of a propylene homopolymer with an unsaturated carboxylic acid or its anhydride and which has a melt flow rate of from 100 to 500 g/10 min, at least one substance selected from single substances, hydroxides and oxides of alkaline earth metals and glass fibers having a length of from 2 to 50 mm, a crystalline propylene-ethylene copolymer and a nucleating agent. However, there is a demand for further improvement in impact strength.
SUMMARY OF THE INVENTION
The object of the present invention is to provide fiber-reinforced molded resin articles having an impact strength higher than that of conventional fiber-reinforced molded resin articles and fiber/resin composites which are suitable as a raw material of the molded articles.
In view of such situations, the present inventors made investigations earnestly and they found that the above-mentioned object can be attained by the invention described below.
Specifically, the present invention is directed to a fiber/resin composite comprising fibers (A), a polypropylene resin (B) and a modified polyolefin resin (C), the weight ratio of the polypropylene resin (B) to the modified polyolefin resin (C), (B)/(C), being from 99.9/0.1 to 60/40, the modified polyolefin resin (C) having a melt flow rate of from 30 to 150 g/10 min, the fibers (A) being arranged parallel to each other in one direction, the composite having a length of from 2 to 100 mm along the direction in which the fibers (A) are arranged, the fibers (A) contained in the composite having a weight average length equal to the length of the composite, wherein the polypropylene resin (B) is composed of a propylene homopolymer segment (B-
1
) and a propylene-ethylene copolymer segment (B-
2
), the propylene homopolymer segment (B-
1
) having an isotactic pentad fraction of at least 0.980 and the content of the propylene-ethylene copolymer segment (B-
2
) in the polypropylene resin (B) being from 10 to 40% by weight. The invention is directed also to a molded article obtained by molding the fiber/resin composite.
REFERENCES:
patent: 5571356 (1996-11-01), Skaletz et al.
patent: 6-240070 (1994-08-01), None
patent: 8-3396 (1996-01-01), None
patent: 2000-239437 (2001-06-01), None
patent: 2001-171010 (2001-06-01), None
patent: 2002-241557 (2002-08-01), None
Atarashi Kenji
Kitano Katsuhisa
Dixon Merrick
Sumitomo Chemical Company Limited
LandOfFree
Fiber/resin composite and molded article formed from the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fiber/resin composite and molded article formed from the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber/resin composite and molded article formed from the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3241830