US4621115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber reinforced polypropylene compositions comprising crystalline e-p block copolymer graft modified with itaconic anhydride
Assignee: Nissan Motor Co Ltd
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Filing: 1985-04-22
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Granted: 1986-11-04
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Expires: 2005-04-22
Abstract
Abstract A glass fiber reinforced polypropylene composition comprising 50 to 85% by weight of a crystalline ethylene-propylene block copolymer which has been graft-modified with itaconic anhydride, 5 to 45% by weight of a glass fiber and 3 to 20% by weight of a polyolefin rubber which has been graft-modified with an unsaturated carboxylic acid (100% by weight in total).
Inventors
- 👤 Hideyo Morita
- 👤 Tomohiko Akagawa
- 👤 Yasuo Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:34
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
A glass fiber reinforced polypropylene composition comprising 50 to 85% by weight of a crystalline ethylene-propylene block copolymer which has been graft-modified with itaconic anhydride, 5 to 45% by weight of a glass fiber and 3 to 20% by weight of a polyolefin rubber which has been graft-modified with an unsaturated carboxylic acid (100% by weight in total).
Claim 2
Dependent Claim
58 words
A glass fiber reinforced polypropylene composition comprising 50 to 85% by weight of a crystalline ethylene-propylene block copolymer which has been graft-modified with itaconic anhydride, 5 to 45% by weight of a glass fiber and 3 to 20% by weight of a polyolefin rubber which has been graft-modified with an unsaturated carboxylic acid (100% by weight in total).
Claim 3
Dependent Claim
39 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein said crystalline ethylene-propylene block copolymer has an ethylene content of 2 to 15% by weight and an MFR (Melt Flow Rate Index) of 0.05 to 30 g/10 min.
Claim 4
Dependent Claim
56 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein said crystalline ethylene-propylene block copolymer is graft-modified with itaconic anhydride by mixing while heating 100 parts by weight of a crystalline ethylene-propylene block copolymer, 0.1 to 3 parts by weight of an itaconic anhydride and 0.05 to 1 part by weight of an organic peroxide.
Claim 5
Dependent Claim
47 words
The glass fiber reinforced polypropylene composition according to claim 3, wherein said organic peroxide is an organic peroxide whose decomposition temperature to obtain one minute half-life is not lower than the melting point of the crystalline ethylene-propylene block copolymer to be used but not exceeding 200° C.
Claim 6
Dependent Claim
42 words
The glass fiber reinforced polypropylene composition according to claim 4, wherein said organic peroxide is t-butyl peroxybenzoate, t-butyl peroxymaleic acid, t-butyl peroxylaurate, cyclohexanone peroxide, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, t-butyl peroxyacetate, t-butyl peroxybenzoate, methylethylketone peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, t-butyl cumyl peroxide, di-t-butyl peroxide or 2,5-dimethyl-2,5-di(t-butyl peroxy)hexine(3).
Claim 7
Dependent Claim
17 words
The glass fiber reinforced polypropylene composition according to claim 5, wherein said organic peroxide is t-butyl peroxybenzoate.
Claim 8
Dependent Claim
33 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein said glass fiber is in the form of chopped strand or of roving which is cut into 2 to 10 mm lengths.
Claim 9
Dependent Claim
33 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein the proportion of said glass fiber is 20 to 30% by weight of the total amount of the crystalline ethylene-propylene block copolymer.
Claim 10
Dependent Claim
37 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein said polyolefin rubber is ethylene-propylene copolymer rubber (EPR), ethylene-propylene-unconjugated-diene copolymer rubber (EPDM) or ethylene-butene-1 copolymer rubber, each having an ethylene content of about 30 to 80%.
Claim 11
Dependent Claim
23 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein said unsaturated carboxylic acid is maleic anhydride, itaconic anhydride or acrylic acid.
Claim 12
Dependent Claim
28 words
The glass fiber reinforced polypropylene composition according to claim 1, wherein the MFR (230° C., 2160 g) of the said graft-modified polyolefin rubber is 0.1 to 10 g/min.
Claim 13
Dependent Claim
34 words
The glass fiber reinforced polypropylene composition according to claim 11, wherein the proportion of said graft-modified polyolefin rubber is 5 to 15% by weight of the total amount of the crystalline ethylene-propylene block copolymer.
Claim 14
Dependent Claim
72 words
The glass fiber reinforced polypropylene composition according to claim 2, wherein said glass fiber is in the form of chopped strand or of roving which is cut into 2 to 10 mm lengths, said polyolefin rubber is ethylene-propylene copolymer rubber (EPR), ethylene-propylene-unconjugated-diene copolymer rubber (EPDM) or ethylene-butene-1 copolymer rubber, each having an ethylene content of about 30 to 80%, and said unsaturated carboxylic acid is maleic anhydride, itaconic anhydride or acrylic acid.
Claim 15
Dependent Claim
110 words
The glass fiber reinforced polypropylene composition according to claim 13, wherein said crystalline ethylene-propylene block copolymer is graft-modified with itaconic anhydride by mixing while heating 100 parts by weight of a crystalline ethylene-propylene block copolymer, 0.1 to 3 parts by weight of an itaconic anhydride and 0.05 to 1 part by weight of an organic peroxide, said organic peroxide is an organic peroxide whose decomposition temperature to obtain one minute half-life is not lower than the melting point of the crystalline ethylene-propylene block copolymer to be used but not exceeding 200° C., and the MFR (230° C., 2160 g) of the said graft-modified polyolefin rubber is 0.1 to 10 g/min.
Claim 16
Dependent Claim
57 words
The glass fiber reinforced polypropylene composition according to claim 14, wherein the proportion of said glass fiber is 20 to 30% by weight of the total amount of the crystalline ethylene-propylene block copolymer, and the proportion of said graft-modified polyolefin rubber is 5 to 15% by weight of the total amount of the crystalline ethylene-propylene block copolymer.
Claim 17
Dependent Claim
42 words
The glass fiber reinforced polypropylene composition according to claim 15, wherein said organic peroxide is t-butyl peroxybenzoate, t-butyl peroxymaleic acid, t-butyl peroxylaurate, cyclohexanone peroxide, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, t-butyl peroxyacetate, t-butyl peroxybenzoate, methylethylketone peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, t-butyl cumyl peroxide, di-t-butyl peroxide or 2,5-dimethyl-2,5-di(t-butyl peroxy)hexine(3).
Claim 18
Dependent Claim
17 words
The glass fiber reinforced polypropylene composition according to claim 15, wherein said organic peroxide is t-butyl peroxybenzoate.
Claim 19
Dependent Claim
57 words
The glass fiber reinforced polypropylene composition according to claim 3, wherein the proportion of said glass fiber is 20 to 30% by weight of the total amount of the crystalline ethylene-propylene block copolymer, and the proportion of said graft-modified polyolefin rubber is 5 to 15% by weight of the total amount of the crystalline ethylene-propylene block copolymer.
Claim 20
Dependent Claim
65 words
The glass fiber reinforced polypropylene composition according to claim 18, wherein said organic peroxide is an organic peroxide whose decomposition temperature to obtain one minute half-life is not lower than the melting point of the crystalline ethylene-propylene block copolymer to be used but not exceeding 200° C., and the MFR (230° C., 2160 g) of the said graft-modified polyolefin rubber is 0.1 to 10 g/min.
Claim 21
Dependent Claim
69 words
The glass fiber reinforced polypropylene composition according to claim 19, wherein said crystalline ethylene-propylene block copolymer has an ethylene content of 2 to 15% by weight and an MFR (Melt Flow Rate Index) of 0.05 to 30 g/10 min., the proportion of said graft-modified polyolefin rubber is 5 to 15% by weight of the total amount of the crystalline ethylene-propylene block copolymer, and said organic peroxide is t-butyl peroxybenzoate.
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JPS5837036A
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US4480065A
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US4477617A
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US4412616A
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
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