The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2007
Filed:
Mar. 17, 2005
Kazuhiro Doi, Sodegaura, JP;
Ikunori Sakai, Sodegaura, JP;
Takayuki Nagai, Toyota, JP;
Takeshi Sekito, Susono, JP;
Susumu Kanzaki, Kisarazu, JP;
Mitsuji Tsuji, Ichihara, JP;
Kazuhiro Doi, Sodegaura, JP;
Ikunori Sakai, Sodegaura, JP;
Takayuki Nagai, Toyota, JP;
Takeshi Sekito, Susono, JP;
Susumu Kanzaki, Kisarazu, JP;
Mitsuji Tsuji, Ichihara, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
A polypropylene resin composition comprises (A) (a-1) a specific crystalline propylene/ethylene block copolymer or (a-3) a polymer mixture comprising the (a-1) and (a-2) a specific crystalline propylene-homopolymer in specific ratio, in an amount of 5 to 56% by weight, (B) a hydroxyl group-containing polypropylene having an intrinsic viscosity [η] of 0.8 to 2.0 dl/g and a melting point of 150 to 168° C., in an amount of 10 to 45% by weight, (C) a copolymer rubber of ethylene and an α-olefin having a melt flow rate (ASTM D-1238, 230° C., load of 2160 g) of 0.5 to 15 g/10 min, in an amount of 18 to 25% by weight, (D) a hydrogenation product of a block copolymer containing a polymer block of a monovinyl-substituted aromatic hydrocarbon compound and a polymer block of a conjugated diene compound, in an amount of 1 to 10% by weight, and (E) an inorganic filler in an amount of 15 to 25% by weight, the total amount of said components (A), (B), (C), (D) and (E) being 100% by weight, hydroxyl group-containing monomer units derived from the hydroxyl group-containing polypropylene (B) being contained in amounts of 1.3 to 4.0% by weight in 100% by weight of the polypropylene resin composition. The polypropylene resin composition exhibits excellent coating adhesion properties and has excellent processability and mechanical strength with a good balance.