Patent US4340562A successfully refreshed from Google Patents.
US4340562A
Expired / Lapsed
US
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Process for producing a molded article
Assignee: Union Carbide Corp
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Filing: 1981-02-18
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Granted: 1982-07-20
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Expires: 2001-02-18
Abstract
Abstract This invention concerns a process for fabricating fiber reinforced thermoset resin articles. The process comprises the steps of (a) providing in a distributing zone, an intimate mixture of one or more fibers with a melting point or a glass transition temperature above about 130° C. and a fiber length greater than about 0.5 centimeters, and a liquid resin, said resin having a viscosity of less than about 3000 centipoise at 25° C., (b) injecting said mixture into the cavity of a closed matched metal die mold, thereby filling said cavity with said mixture, (c) heating said mixture so as to cause an exothermic reaction to occur in said mold, and (d) opening said mold and recovering a thermoset fiber reinforced molded article therefrom.
Inventors
- 👤 Laurence H. Gross
- 👤 Marvin E. Sauers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:31
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; B29C33/00; B29C33/0077; B29C45/00; B29C45/0005; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/48; B29K; B29K2063/00; B29K2067/00; B29K2067/06; B29K2105/00; B29K2105/06; B29K2105/12; B29K2277/00; B29K2277/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A process for producing a fiber reinforced thermoset resin article which comprises the steps of (a) providing in a distributing zone, an intimate mixture of one or more fibers with a melting point or a glass transition temperature above about 130° C., having a fiber length greater than about 0.5 centimeters, and a liquid resin having a viscosity of less than about 3000 centipoise at 25° C., (b) injecting said mixture into the cavity of a closed matched metal die mold, thereby filling said cavity with said mixture; (c) heating said mixture so as to cause an exothermic reaction to occur in said mold, and (d) opening said mold and recovering a thermoset molded article therefrom.
Claim 2
Dependent Claim
116 words
A process for producing a fiber reinforced thermoset resin article which comprises the steps of (a) providing in a distributing zone, an intimate mixture of one or more fibers with a melting point or a glass transition temperature above about 130° C., having a fiber length greater than about 0.5 centimeters, and a liquid resin having a viscosity of less than about 3000 centipoise at 25° C., (b) injecting said mixture into the cavity of a closed matched metal die mold, thereby filling said cavity with said mixture; (c) heating said mixture so as to cause an exothermic reaction to occur in said mold, and (d) opening said mold and recovering a thermoset molded article therefrom.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein the amount of fibers supplied to the distributing zone is sufficient to provide from about 15 to about 70 weight percent of the weight of the molded article.
Claim 4
Dependent Claim
34 words
The process of claim 2, wherein the amount of fibers supplied to the distributing zone is sufficient to provide from about 40 to about 60 weight percent of the weight of the molded article.
Claim 5
Dependent Claim
21 words
The process of claim 1, wherein the fibers have lengths which range from greater than about 0.5 to about 5 centimeters.
Claim 6
Dependent Claim
15 words
The process of claim 4, wherein the fiber length is greater than about 1.00 centimeters.
Claim 7
Dependent Claim
15 words
The process of claim 1, 2, 3, 4, or 5 wherein the fiber is glass.
Claim 8
Dependent Claim
20 words
The process of claim 1, wherein the fiber and the resin are fed by air suspension into the distributing zone.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the mixture in the distributing zone is maturated.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein the mixture of fibers and liquid resin in the distributing zone is subjected to sufficient pressure to cause intimate contact between them.
Claim 11
Dependent Claim
13 words
The process of claim 9, wherein air is vented from the distributing zone.
Claim 12
Dependent Claim
26 words
The process of claim 1, wherein the value of the height to width ratio of the volume of the distributing zone is less than about 1.
Claim 13
Dependent Claim
13 words
The process of claim 11, wherein said ratio is less than about 0.6.
Claim 14
Dependent Claim
44 words
The process of claim 1, wherein a pre-compressed mass of the fiber is contacted with the resin, the resin is allowed to penetrate the fiber mass and then the fiber mass containing the resin is compressed again, thereby further distributing resin within the mass.
Claim 15
Dependent Claim
28 words
The process of claim 13, wherein a portion of the fiber is pre-compressed and contacted with the resin, followed by addition of such fiber to the distributing zone.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |