US3883473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber reinforced polyvinyl chloride
Assignee: North Carolina National Bank NCNB
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Filing: 1973-08-03
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Granted: 1975-05-13
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Expires: 1993-08-03
Abstract
Abstract A glass fiber reinforced thermoplastic composition particularly suitable for use in forming high strength articles by injection molding. The resin composition includes about 100 parts by weight of a vinyl chloride polymer and from about 8 to about 15 parts by weight of a coumarone-indene resin. The resin glass composition comprises by weight about 5-50 percent glass fiber and about 9550 percent of the resin composition.
Inventors
- 👤 Michael E Kucsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:22
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L45/00; C08L45/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A RIGID THERMOPLASTIC COMPOSITION CONSISTING ESSENTIALLY OF A RESIN COMPOSITION COMPRISING ABOUT 100 PARTS BY WEIGHT OF A RIGID VINYL CHLORIDE HOMOPOLYMER, ABOUT 8 TO ABOUT 15 PARTS BY WEIGHT OF A COUMARONE-INDENE RESIN HAVING A RING AND BALL SOFTENING POINT ABOVE ABOUT 100*C, AND ABOUT 5 PERCENT TO ABOUT 55 PERCENT GLASS FIBERS BY WEIGHT OF RESIN COMPOSITION.
Claim 2
Dependent Claim
59 words
A RIGID THERMOPLASTIC COMPOSITION CONSISTING ESSENTIALLY OF A RESIN COMPOSITION COMPRISING ABOUT 100 PARTS BY WEIGHT OF A RIGID VINYL CHLORIDE HOMOPOLYMER, ABOUT 8 TO ABOUT 15 PARTS BY WEIGHT OF A COUMARONE-INDENE RESIN HAVING A RING AND BALL SOFTENING POINT ABOVE ABOUT 100*C, AND ABOUT 5 PERCENT TO ABOUT 55 PERCENT GLASS FIBERS BY WEIGHT OF RESIN COMPOSITION.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said coumarone-indene resin has a ball and ring softening point between about 126*C and about 155*C.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein said glass fibers are from about 1/8 inch to about 1 inch in length.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein said glass fibers are about 1/4 inch in length.
Claim 6
Dependent Claim
45 words
The composition of claim 1 wherein said vinyl chloride homopolymer has a bulk density of about 0.53 and a relative viscosity of about 1.75 + or - 0.2 determined using 1 gram of resin per 100 grams of cyclohexyl and measuring the viscosity at 25*C.
Claim 7
Dependent Claim
22 words
A product formed from the composition of claim 1, wherein said product has a flexural strength of at least about 20,000 psi.
Claim 8
Dependent Claim
22 words
A product formed from the composition of claim 1, wherein said product has a flexural-elastic modulus of at least about 980,000 psi.
Claim 9
Dependent Claim
38 words
A product formed from the composition of claim 1, wherein said product has a heat distortion temperature at 264 psi of at least about 80*C and a heat distortion temperature at 66 psi of at least about 83.5*C.
Claim 10
Dependent Claim
22 words
A product formed from the composition of claim 1, wherein said product has an Izod impact strength of at least about 0.78.
Claim 11
Dependent Claim
65 words
The product formed from the composition of claim 1, wherein said product has a flexural strength of at least about 20,000 psi, a flexural-elastic modulus of at least about 980,000 psi, an Izod impact strength of at least about 0.78, a heat distortion temperature at 264 psi of at least about 80*C, and a heat distortion temperature at 66 psi of at least about 83.5*C.
References Cited (Backward Citations)
US2773851A
Cited
US3022210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |