EP0465317A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Injection-molded article
Assignee: Mitsubishi Chemical Corp
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Filing: 1991-06-27
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Granted: —
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Expires: 2011-06-27
Abstract
Abstract A large-sized exterior part of an automotive vehicle, injection-molded and formed of a polymer material comprising: (A) polypropylene in an amount ranging from 50 to 70 weight %, the polypropylene containing ethylene in an amount not more than 15 weight % relative to the polypropylene and having a MFR (at 230°C) ranging from 5 to 60 g/10 min.; (B) ethylene-propylene copolymer rubber polymerized in presence of a vanadium-based catalyst, in an amount ranging from 5 to 30 weight %, the copolymer containing propylene in an amount ranging from 20 to 40 weight % relative to the ethylene-propylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 80; (C) ethylene-propylene copolymer rubber polymerized in presence of a titanium-based catalyst, in an amount ranging from 5 to 45 weight %, the copolymer containing propylene in an amount ranging from 30 to 70 weight % relative to the ethylene-prolylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 75; and (D) polyethylene in an amount not more than 10 weight %, the polyethylene having a MFR (at 190°C) ranging from 5 to 50 g/10 min. The injection-molded article has an average thickness ranging from 2 to 6 mm, a flexural elastic modulus ranging from 3000 to 6000 kg/cm², and a coefficient of linear expansion not higher than 8 X 10⁻⁵/°C.
Inventors
- 👤 Masahiro Terada
- 👤 Nobuji Sugimoto
- 👤 Toshiro Watanabe
- 👤 Takashi Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/03; B29; B29C; B29C45/00; B29C45/0001; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L53/00; B29L; B29L2031/00; B29L2031/30; B29L2031/3044; C08L2205/00; C08L2205/02; C08L2205/03; C08L2205/035; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/12; C08L23/14; C08L23/142; C08L23/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
216 words
An injection-molded article, formed of a material comprising: (A) polypropylene in an amount ranging from 50 to 70 weight %, said polypropylene containing ethylene in an amount not more than 15 weight % relative to said polypropylene and having a MFR (at 230°C) ranging from 5 to 60 g/10 min.; (B) ethylene-propylene copolymer rubber polymerized in presence of a vanadium-based catalyst, in an amount ranging from 5 to 30 weight %, said copolymer containing propylene in an amount ranging from 20 to 40 weight % relative to said ethylene-propylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 80; (C) ethylene-propylene copolymer rubber polymerized in presence of a titanium-based catalyst, in an amount ranging from 5 to 45 weight %, said copolymer containing propylene in an amount ranging from 30 to 70 weight % relative to said ethylene-prolylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 75; and (D) polyethylene in an amount not more than 10 weight %, said polyethylene having a MFR (at 190°C) ranging from 5 to 50 g/10 min.; wherein said injection-molded article has an average thickness ranging from 2 to 6 mm, a flexural elastic modulus ranging from 3000 to 6000 kg/cm², and a coefficient of linear expansion not higher than 8 X 10⁻⁵/°C.
Claim 2
Dependent Claim
36 words
An injection-molded article as claimed in Claim 1, wherein said flexural elastic modulus is set by selecting proportions of said polypropylene (A), said ethylene-propylene copolymer rubber (B), said ethylene-propylene copolymer rubber (C) and said polyethylene (D).
Claim 3
Dependent Claim
21 words
An injection-molded article as claimed in Claim 1, wherein said vanadium-based catalyst includes a vanadium compound and an organic aluminum compound.
Claim 4
Dependent Claim
21 words
An injection-molded article as claimed in Claim 1, wherein said titanium compound includes a titanium compound and an organic aluminum compound.
Claim 5
Dependent Claim
23 words
An injection-molded article as claimed in Claim 1, wherein said polypropylene (A) is in an amount raning from 55 to 66 weight %.
Claim 6
Dependent Claim
24 words
An injection-molded article as claimed in Claim 1, wherein said polypropylene (A) contains ethylene in an amount ranging from 2 to 10 weight %.
Claim 7
Dependent Claim
25 words
An injection-molded article as claimed in Claim 1, wherein said ethylenepropylene copolymer rubber (B) is in an amount ranging from 10 to 25 weight %.
Claim 8
Dependent Claim
25 words
An injection-molded article as claimed in Claim 1, wherein said ethylenepropylene copolymer rubber (C) is in an amount ranging from 10 to 35 weight %.
Claim 9
Dependent Claim
25 words
An injection-molded article as claimed in Claim 1, wherein said ethylenepropylene copolymer rubber contains propylene in an amount ranging from 10 to 35 weight %.
Claim 10
Dependent Claim
23 words
An injection-molded article as claimed in Claim 1, wherein said polyethylene (D) is in an amount ranging from 3 to 7 weight %.
Claim 11
Dependent Claim
22 words
An injection-molded article as claimed in Claim 1, wherein said injection-molded article has an average thickness ranging from 2.5 to 5 mm.
Claim 12
Dependent Claim
22 words
An injection-molded article as claimed in Claim 1, wherein said injection-molded article has an elastic modulus ranging from 4000 to 5000 kg/cm².
Claim 13
Dependent Claim
225 words
An injection-molded large-sized exterior part of an automotive vehicle, said part being formed of a material comprising: (A) polypropylene in an amount ranging from 50 to 70 weight %, said polypropylene containing ethylene in an amount not more than 15 weight % relative to said polypropylene and having a MFR (at 230°C) ranging from 5 to 60 g/10 min.; (B) ethylene-propylene copolymer rubber polymerized in presence of a vanadium-based catalyst, in an amount ranging from 5 to 30 weight %, said copolymer containing propylene in an amount ranging from 20 to 40 weight % relative to said ethylene-propylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 80; (C) ethylene-propylene copolymer rubber polymerized in presence of a titanium-based catalyst, in an amount ranging from 5 to 45 weight %, said copolymer containing propylene in an amount ranging from 30 to 70 weight % relative to said ethylene-prolylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 75; and (D) polyethylene in an amount not more than 10 weight %, said polyethylene having a MFR (at 190°C) ranging from 5 to 50 g/10 min.; wherein said injection-molded article has an average thickness ranging from 2 to 6 mm, a flexural elastic modulus ranging from 3000 to 6000 kg/cm², and a coefficient of linear expansion not higher than 8 X 10⁻⁵/°C.
Claim 14
Dependent Claim
219 words
A bumper of an automotive vehicle, formed of a material comprising: (A) polypropylene in an amount ranging from 50 to 70 weight %, said polypropylene containing ethylene in an amount not more than 15 weight % relative to said polypropylene and having a MFR (at 230°C) ranging from 5 to 60 g/10 min.; (B) ethylene-propylene copolymer rubber polymerized in presence of a vanadium-based catalyst, in an amount ranging from 5 to 30 weight %, said copolymer containing propylene in an amount ranging from 20 to 40 weight % relative to said ethylene-propylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 80; (C) ethylene-propylene copolymer rubber polymerized in presence of a titanium-based catalyst, in an amount ranging from 5 to 45 weight %, said copolymer containing propylene in an amount ranging from 30 to 70 weight % relative to said ethylene-prolylene copolymer rubber and having a Mooney viscosity ML₁₊₄(100°C) ranging from 20 to 75; and (D) polyethylene in an amount not more than 10 weight %, said polyethylene having a MFR (at 190°C) ranging from 5 to 50 g/10 min.; wherein said injection-molded article has an average thickness ranging from 2 to 6 mm, a flexural elastic modulus ranging from 3000 to 6000 kg/cm², and a coefficient of linear expansion not higher than 8 X 10⁻⁵/°C.
References Cited (Backward Citations)
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