US4480065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene-base resin composition
Assignee: Mitsui Chemicals Inc
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Filing: 1983-05-17
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Granted: 1984-10-30
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Expires: 2003-05-17
Abstract
Abstract A polypropylene-base resin composition which comprises: (a) 80-60 wt. % of a crystalline ethylenepropylene block copolymer having an ethylene content of 11-30 wt. % and specific physical data; (b) 5-35 wt. % of an ethylene-propylene copolymer rubber having a propylene content of 20-50 wt. % and a specific Mooney viscosity; (c) 5-35 wt. % of an ethylene-propylene-a specific diene terpolymer having a propylene content of 20-50 wt. % and a specific Mooney viscosity; and (d) 2-5 wt. %, based on the total weight of the above resin components (a), (b) and (c), of an inorganic filler having a particle size of 3 mu m or smaller. The composition has excellent paintability and high stiffness, impact resistance and molding fluidity.
Inventors
- 👤 Yoichi Kawai
- 👤 Yoshihisa Gotoh
- 👤 Masami Maki
- 👤 Akio Yoshihara
- 👤 Minoru Hoshino
- 👤 Katsumi Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:01
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08L53/00; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A polypropylene resin composition which comprises: (a) 80-60 wt.% of a crystalline ethylene-propylene block copolymer having an ethylene content of 11-30 wt.%, polypropylene units insoluble in boiling n-heptane of 75 wt.% or more, an intrinsic viscosity of 1.2-2.0 as measured as a tetraline solution (135° C.) and a melt flow index of 8 or greater; (b) 5-35 wt.% of an ethylene-propylene copolymer rubber having a propylene content of 20-50 wt.% and a Mooney viscosity (ML 1+4 , 100° C.) of 20-100; (c) 5-35 wt.% of an ethylene-propylene-diene terpolymer having a propylene content of 20-50 wt.% and a Mooney viscosity (ML 1+4 , 100° C.) of 20-110, said diene being ethylidene norbornene, dicyclopentadiene or 1,4-hexadiene; and (d) 2-5 wt.% based on the total weight of the above resin components (a), (b) and (c) of an inorganic filler having a particle size of 3 μm or smaller.
Claim 2
Dependent Claim
145 words
A polypropylene resin composition which comprises: (a) 80-60 wt.% of a crystalline ethylene-propylene block copolymer having an ethylene content of 11-30 wt.%, polypropylene units insoluble in boiling n-heptane of 75 wt.% or more, an intrinsic viscosity of 1.2-2.0 as measured as a tetraline solution (135° C.) and a melt flow index of 8 or greater; (b) 5-35 wt.% of an ethylene-propylene copolymer rubber having a propylene content of 20-50 wt.% and a Mooney viscosity (ML 1+4 , 100° C.) of 20-100; (c) 5-35 wt.% of an ethylene-propylene-diene terpolymer having a propylene content of 20-50 wt.% and a Mooney viscosity (ML 1+4 , 100° C.) of 20-110, said diene being ethylidene norbornene, dicyclopentadiene or 1,4-hexadiene; and (d) 2-5 wt.% based on the total weight of the above resin components (a), (b) and (c) of an inorganic filler having a particle size of 3 μm or smaller.
Claim 3
Dependent Claim
34 words
The composition as claimed in claim 1, wherein the sum of the ethylene-propylene copolymer rubber and ethylene-propylene-diene terpolymer amounts to 20-40 wt.% of the total weight of the resin components (a), (b) and (c).
Claim 4
Dependent Claim
20 words
The composition as claimed in claim 1, wherein the particle size of the inorganic filler is 2 μm or smaller.
Claim 5
Dependent Claim
43 words
The composition as claimed in claim 1, wherein the inorganic filler is selected from the group consisting of calcium and magnesium oxides, hydroxides, carbonates and silicates; calcium and barium sulfates; aluminum hydroxide; basic magnesium carbonate; calcium sulfite; talc; clay; dolomite; pirssonite; and glass.
Claim 6
Dependent Claim
26 words
The composition as claimed in claim 1, wherein the inorganic filler is selected from the group consisting of calcium carbonate, barium sulfate, calcium silicate and talc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |