US4695509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide fiber reinforcement in thermoset polyurethane composites
Assignee: Honeywell International Inc
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Filing: 1985-12-23
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Granted: 1987-09-22
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Expires: 2005-12-23
Abstract
Abstract Fiber-reinforced thermoset polyurethane composites display enhanced impact strength when sufficient amounts of a high tenacity aliphatic polyamide fiber characterized by a drawn denier of 4 to 8 denier per filament; a thermal shrinkage of up to about 14 percent; an elongation of from less than 28 percent; and a tenacity of at least 5.5, preferably at least 7 grams per denier, are incorporated into the composite. The process of producing such composites, including reinforced reaction injection molding processes, resin transfer molding processes, and casting process are improved by a reduction in equipment wear resulting from the incorporation of the specified polyamide fiber.
Inventors
- 👤 Colleen W. Cordova
- 👤 Hugh H. Rowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:02
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/046; C08J2375/00; C08J2375/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T442/00; Y10T442/20; Y10T442/2008; Y10T442/2861; Y10T442/2893
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A fiber-reinforced thermoset polyurethane molded composite characterized by improved impact strength comprising molded thermoset polyurethane matrix reinforced with high tenacity polyamide fiber in an amount sufficient to provide said composite with said improved impact strength, said polyamide fiber characterized by a drawn denier of 4 to 8 denier per filament; a thermal shrinkage of up to about 14 percent; an elongation of less than 28 percent; and a tenacity of at least 5.5 grams per denier.
Claim 2
Dependent Claim
76 words
A fiber-reinforced thermoset polyurethane molded composite characterized by improved impact strength comprising molded thermoset polyurethane matrix reinforced with high tenacity polyamide fiber in an amount sufficient to provide said composite with said improved impact strength, said polyamide fiber characterized by a drawn denier of 4 to 8 denier per filament; a thermal shrinkage of up to about 14 percent; an elongation of less than 28 percent; and a tenacity of at least 5.5 grams per denier.
Claim 3
Dependent Claim
19 words
The composite of claim 1 wherein said polyamide fiber has a tenacity of at least 7 grams per denier.
Claim 4
Dependent Claim
20 words
The composite of claim 2 wherein said polyamide fiber is cut fiber having a length of at least 0.125 inch.
Claim 5
Dependent Claim
16 words
The composite of claim 2 wherein said polyamide fiber is in the form of nonwoven matt.
Claim 6
Dependent Claim
15 words
The composite of claim 2 wherein said polyamide fiber is in the form of fabric.
Claim 7
Dependent Claim
47 words
A process for the production of the composite of claim 1 comprising placing said polyamide fiber in the form of nonwoven mat or fabric into a mold; introducing a charge into the mold comprising a polymeric isocyanate, polyol, and curing agent; and curing to form said composite.
Claim 8
Dependent Claim
69 words
A process for the production of the composite of claim 1 comprising: (a) mixing said polyamide fiber in the form of cut fiber with at least one starting component for the production of thermoset polyurethane; (b) blending starting components for the production of thermoset polyurethane including the fiber-containing component of (a); (c) introducing said blend of starting components into a closed mold; (d) and curing to form said composite.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein said cut fiber has a length of at last 0.125 inch.
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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |