US3853808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced polypropylene composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1972-04-20
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Granted: 1974-12-10
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Expires: 1992-04-20
Abstract
Abstract A reinforced polypropylene composition, having improved mechanical strength and heat resistance as well as high rigidity, comprising polypropylene, a bismaleimide, and glass fibers is disclosed.
Inventors
- 👤 H Kishikawa
- 👤 H Katsuki
- 👤 T Terazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A PEROXIDE FREE-REINFORCED POLYPROPYLENE COMPOSITION COMPRISING POLYPROPYLENE, GLASS FIBERS AND A BISMALEIMIDE, THE PROPORTION OF THE SAID GLASS FIBERS RANGING FROM ABOUT 10 TO 40 PERCENT BY WEIGHT OF SAID COMPOSITION AND THE PROPORTION OF SAID BISMALEIMIDE RANGING FROM ABOUT 0.01 TO 3 PERCENT BY WEIGHT OF SAID COMPOSITION.
Claim 2
Dependent Claim
49 words
A PEROXIDE FREE-REINFORCED POLYPROPYLENE COMPOSITION COMPRISING POLYPROPYLENE, GLASS FIBERS AND A BISMALEIMIDE, THE PROPORTION OF THE SAID GLASS FIBERS RANGING FROM ABOUT 10 TO 40 PERCENT BY WEIGHT OF SAID COMPOSITION AND THE PROPORTION OF SAID BISMALEIMIDE RANGING FROM ABOUT 0.01 TO 3 PERCENT BY WEIGHT OF SAID COMPOSITION.
Claim 3
Dependent Claim
28 words
The reinforced polypropylene composition as claimed in claim 1, wherein said polypropylene is selected from the group consisting of a crystalline propylene homopolymer and a crystalline propylene-ethylene copolymer.
Claim 4
Dependent Claim
30 words
The reinforced polypropylene composition as claimed in claim 1, wherein the proportion of said bismaleimide in the composition ranges from about 0.05 to 1 percent by weight of said composition.
Claim 5
Dependent Claim
38 words
The reinforced polypropylene composition as claimed in claim 1, wherein said bismaleimide is N,N''-4,4''-diphenylmethane bismaleimide, N,N''-m-phenylene bismaleimide, N,N''-4-methyl-m-phenylene bismaleimide, N,N''-4,4''-diphenylethane bismaleimide, N, N''-p-phenylene bismaleimide, N,N''-4,4''-diphenylsulfone bismaleimide, N,N''-2,2''-dithiodiphenylene bismaleimide, N,N''-4, 4''-dioxyphenylethane bismaleimide, N,N''-3,3''-dichloro-4,4''-biphenylene bismaleimide, N,N''-o-phenylene bismaleimide, or N,N''-hexamethylene bismaleimide.
Claim 6
Dependent Claim
49 words
A reinforced polypropylene composition consisting essentially of polypropylene, glass fibers and a bismaleimide, the proportion of said glass fibers ranging from about 10 to 40 percent by weight of said composition and the proportion of said bismaleimide ranging from about 0.01 to 3 percent by weight of said composition.
Claim 7
Dependent Claim
49 words
A reinforced polypropylene composition consisting essentially of polypropylene, glass fibers and a bismaleimide, the proportion of said glass fibers ranging from about 10 to 40 percent by weight of said composition and the proportion of said bismaleimide ranging from about 0.01 to 3 percent by weight of said composition.
Claim 8
Dependent Claim
15 words
The reinforced polypropylene composition as claimed in claim 1, which consists essentially of said components.
Claim 9
Dependent Claim
17 words
The reinforced polypropylene composition as claimed in claim 1, wherein said polypropylene is a crystalline propylene homopolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |