IP Library Granted Patent US 6,867,252
Granted Patent B1
US 6,867,252 · App. 09/674,498 · Granted Mar 15, 2005

Propylene resin composition and interior automotive member comprising the same

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Quick Facts
Patent No.
US 6,867,252
App. No.
09/674,498
Granted
Mar 15, 2005
Kind
B1
Abstract

A propylene-based resin composition has good external appearance due to good weld appearance and low gloss and has excellent mechanical properties such as impact resistance and stiffness. The composition is well-balanced in the external appearance and mechanical properties. Automotive interior trims made of the composition are also described. The propylene-based resin composition comprises (A) 60 to 90% by weight of a propylene-based resin (1) comprising 78 to 88% by weight of 23° C. p-xylene insolubles (a) and 12 to 22% by weight of 23° C. p-xylene solubles (b), (2) the insolubles (a) having an isotactic pentad fraction of 95% or higher, a relaxation time (τ) of 0.01 to 0.35 second at an angular frequency (ω) of 10°/sec when measured by melt viscoelastometry and a molecular weight distribution index (PDI) of 1 to 18 which is expressed by ω 2 /10ω 1 wherein ω 1 is an angular frequency at which a storage modulus (G′) as measured by melt viscoelastometry is 2×10 2 Pa and ω 2 is an angular frequency at which a storage modulus (G′) as measured by melt viscoelastometry is 2×10 4 Pa, and (3) the solubles (b) having an intrinsic viscosity [η] (in decalin at 135° C.) of 3.3 dl/g or higher and an ethylene unit content of 43% by weight or smaller; (B) 0 to 10% by weight of a rubberlike elastomer; and (C) 10 to 30% by weight of tale. The automotive interior trims are produced by injection-molding the composition.

Claims (8)

1. A propylene-based resin composition comprising:

(A) 60 to 90% by weight of a propylene-based resin,

(1) comprising 78 to 88% by weight of 23° C. p-xylene insolubles (a) and 12 to 22% by weight of 23° C. p-xylene solubles (b),

(2) the insolubles (a) having an isotactic pentad fraction of 95% or higher, a relaxation time (τ) of 0.01 to 0.35 second at an angular frequency (ω) of 10°/sec when measured by melt viscoelastometry and a molecular weight distribution index (PDI) of 1 to 18 which is expressed by ω 2 /10ω 1 wherein ω 1 is an angular frequency at which a storage modulus (G′) as measured by melt viscoelastometry is 2×10 2 Pa and ω 2 is an angular frequency at which a storage modulus (G′) as measured by melt viscoelastometry is 2×10 4 Pa, and

(3) the solubles (b) having an intrinsic viscosity [η] (in decalin at 135° C.) of 3.3 dl/g or higher and an ethylene unit content of 43% by weight or smaller;

(B) 0 to 10% by weight of a rubber-like elastomer; and

(C) 10 to 30% by weight of talc.

2. An automotive interior trim produced by injection-molding the propylene-based resin composition of claim 1 .

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 27, 2007
From: IDEMITSU KOSAN CO., LTD.
To: PRIME POLYMER CO., LTD.
Reel/Frame 018934/0837 →
MERGER Recorded Dec 20, 2004
From: IDEMITSU PETROCHEMICAL CO. LTD.
To: IDEMITSU KOSAN CO. LTD.
Reel/Frame 015478/0140 →