Claims
- 1. A thermoplastic resin composition consisting essentially of:
- 100 parts by weight of a resin composition (D) comprising:
- not less than 50% by weight of a crystalline polypropylene component (A),
- 10 to 25% by weight of an ethylene-butene-1-copolymer rubber (B), and
- 10 to 25% by weight of an ethylene-propylene copolymer rubber (C);
- 0.1 to 5.0 parts by weight of a modified polypropylene (E);
- 0.005 to 5 parts by weight of a saturated polyester resin (F); and
- 0.1 to 5.0 parts by weight of an epoxy group-containing copolymer (G),
- said crystalline polypropylene component (A) being selected from the group consisting of:
- (i) the product of a polymerization of propylene in the first step and a random copolymerization of propylene and ethylene in the second step, each of which have been polymerized in the presence of a Ziegler-Natta catalyst by sequentially passing propylene monomer, and then propylene/ethylene monomers over the catalyst consisting of:
- 30 to 90% by weight of propylene homopolymer portions as the first segment which have a molecular weight distribution of 5 or less as determined by gel permeation chromatography and an intrinsic viscosity of 0.85 to 0.95 dl/g as determined at 135.degree. C. using tetralin as a solvent, and 10 to 70% by weight of propylene-ethylene random copolymer portions as the second segment (A') which have a calculated viscosity parameter [.eta.].sub.EP of 4.5 to 5.5 dl/g as defined below,
- [.eta.].sub.EP =[.eta.].sub.T /X-(1/X-1)[.eta.].sub.P
- wherein
- [.eta.].sub.P : the intrinsic viscosity (dl/g) of the crystalline propylene homopolymer portion as determined at 135.degree. C. using tetralin as a solvent
- [.eta.].sub.T : the intrinsic viscosity (dl/g) of the whole block copolymer as determined at 135.degree. C. using tetralin as a solvent
- X=1-(.DELTA.Hf).sub.T /(.DELTA.Hf).sub.P
- wherein
- (.DELTA.Hf).sub.T : the quantity of fusion (cal/g) of the whole block copolymer,
- (.DELTA.Hf).sub.P : the quantity of fusion (cal/g) of the crystalline propylene homopolymer portion,
- and a weight ratio of the propylene units to the ethylene units of 75:25 to 60:40, and
- (ii) mixtures of the product of a polymerization of propylene in the first step and a random copolymerization of propylene and ethylene in the second step, each of which have been polymerized in the presence of Ziegler-Natta catalyst by sequentially passing propylene monomer, and then propylene/ethylene monomers over the catalyst consisting of:
- 30 to 90% by weight of propylene homopolymer portions as the first segment which have a molecular weight distribution of 5 or less as determined by gel permeation chromatography and an intrinsic viscosity of 0.85 to 0.95 dl/g as determined at 135.degree. C. using tetralin as a solvent, and 10 to 70% by weight of propylene-ethylene random copolymer portions as the second segment (A') which have a calculated viscosity parameter [.eta.].sub.EP of 4.5 to 5.5 dl/g as defined above, and a weight ratio of the propylene units to the ethylene units of 75:25 to 60:40, and
- a crystalline propylene homopolymer having a molecular weight distribution of 5 or less as determined by gel permeation chromatography and an intrinsic viscosity of 0.85 to 0.95 dl/g as determined at 135.degree. C. using tetraline as a solvent, and in said component (A), the second segment (A') being contained in an amount of 3.3% by weight or more and less than 25% by weight based on the resin composition (D),
- said ethylene-butene-1 copolymer rubber (B) having a molecular weight distribution of 2.7 or less as determined by gel permeation chromatography, a content of butene-1 unit of from 15 to 20% by weight, an intrinsic viscosity of from 1.1 to 2.1 dl/g as determined at 70.degree. C. using xylene as a solvent, and a Mooney viscosity at 100.degree. C., ML.sub.1+4 100, of from 7 to 90,
- said ethylene-propylene copolymer rubber (C) having a molecular weight distribution of 2.7 or less as determined by gel permeation chromatography, a content of propylene unit of from 20 to 30% by weight, an intrinsic viscosity of from 1.8 to 2.2 dl/g as determined at 70.degree. C. using xylene as a solvent, and a Mooney viscosity at 100.degree. C., ML.sub.1+4 100, of from 35 to 100,
- said resin composition (D) satisfying the following mathematical expressions (1) to (5):
- A+B+C=100 (1)
- B+C.ltoreq.30 (2)
- 0.3.ltoreq.(A'+B+C)/100<0.55 (3)
- 0.1.ltoreq.A'/(A'+B+C) (4)
- 0.4.ltoreq.B/(B+C).ltoreq.0.6 (5)
- wherein A, B and C are the weight percentages of the crystalline polypropylene component (A), the ethylene-butene-1 copolymer rubber (B) and the ethylene-propylene copolymer rubber (C) in the resin composition (D), respectively; and A' is the weight percentage, based on the resin composition (D), of the second segment of the crystalline polypropylene component (A),
- said modified polypropylene (E) being obtained by graft copolymerizing, onto a polypropylene, monomers consisting of 0.01 to 10 parts by weight of an unsaturated aromatic monomer and 0.01 to 10 parts by weight of either an unsaturated carboxylic acid or a derivative thereof per 100 parts by weight of the polypropylene,
- said epoxy group-containing copolymer (G) being selected from the group consisting of:
- (i) a copolymer of 99.9% to 50% by weight of an ethylenically unsaturated compound selected from the group consisting of:
- (a) ethylene,
- (b) vinyl acetate,
- (c) methyl acrylate,
- (d) ethyl acrylate,
- (e) methyl methacrylate,
- (f) vinyl chloride,
- (g) vinylidene chloride, and
- (h) isobutyl vinyl ether,
- and 0.1% to 50% by weight of at least one unsaturated epoxy compound selected from the group consisting of:
- (a) glycidyl acrylate,
- (b) glycidyl methacrylate,
- (c) glycidyl itaconate,
- (d) allyl glycidyl ether,
- (e) 2-methylallyl glycidyl ether, and
- (f) styrene p-glycidyl ether, and
- (ii) a terpolymer of 99.9% to 50% by weight of ethylene and at least one ethylenically unsaturated compound selected from the group consisting of (a) vinyl acetate and (b) methyl acrylate, and 0.1% to 50% by weight of at least one unsaturated epoxy compound as defined above,
- the mixture of the crystalline polypropylene component (A), the ethylene-butene-1 copolymer rubber (B), the ethylene-propylene copolymer rubber (C), the modified polypropylene (E), the saturated polyester resin (F) and the epoxy group-containing copolymer (G) having a melt flow rate, determined at 230.degree. C. under a load of 2.16 kg using an orifice having a diameter of 2.095 mm and a length of 8.000 mm, of from 15 to 25 g/10 min. and a flexural modulus at 23.degree. C. of from 3,000 to 25,000 kg/cm.sup.2.
- 2. The thermoplastic resin composition of claim 1, which further comprises 1 to 22 parts by weight of talc (H) having an average particle size corresponding to 50% weight (D.sub.50) in a cumulative size distribution curve of 4 .mu.m or less, and the mixture of the crystalline polypropylene component (A), the ethylene-butene-1 copolymer rubber (B), the ethylene-propylene copolymer rubber (C), the modified polypropylene (E), the saturated polyester resin (F), the epoxy group-containing copolymer (G) and the talc (E) has a melt flow rate, determined at 230.degree. C. under a load of 2.16 kg using an orifice having a diameter of 2.095 mm and a length of 8,000 mm, of from 15 to 25 g/10 min. and a flexural modulus at 23.degree. C. of from 3,000 to 25,000 kg/cm.sup.2.
- 3. An article obtained by injection molding the thermoplastic resin composition of claim 1.
- 4. An article obtained by injection molding the thermoplastic resin composition of claim 2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-188041 |
Jul 1992 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/092,449, filed Jul. 14, 1993, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (10)
Number |
Date |
Country |
0336320 |
Oct 1989 |
EPX |
0337214 |
Oct 1989 |
EPX |
0498907 |
Aug 1992 |
EPX |
51-136735 |
Nov 1976 |
JPX |
58-17140 |
Feb 1983 |
JPX |
59-98157 |
Jun 1984 |
JPX |
1204946 |
Aug 1989 |
JPX |
4153243 |
May 1992 |
JPX |
1557376 |
Dec 1979 |
GBX |
9001519 |
Feb 1990 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Catalogue of Ethylene/Alpha-Olefin Copolymer Tafmer A/P by Mitsui Petrochemical Industries, Ltd. |
Continuations (1)
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Number |
Date |
Country |
Parent |
92449 |
Jul 1993 |
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