US4654100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing random-fiber thermoset composites
Assignee: Dow Chemical Co
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Filing: 1985-03-04
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Granted: 1987-03-31
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Expires: 2005-03-04
Abstract
Abstract Processes for the preparation of random-fiber thermoset composite sheets by employing a latent curing agent thermoset resin formulation or a coreactant thermoset system such that uncured thermoset composite sheets are formed which can be subsequently formed and cured into articles of manufacture.
Inventors
- 👤 Larry D. Yats
- 👤 Ritchie A. Wessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; C; C08; C08J; C08J5/00; C08J5/04; C08J5/24; C08J5/241; C08J5/244; C08J5/249; C08L; C08L63/00; D21H13/36; D21H13/38; D21H13/40; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H17/49; D21H17/52; C08J2363/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A process for preparing a random-fiber thermoset composite comprising the steps of: (a) preparing an aqueous slurry comprising (i) a reinforcing material, (ii) binder, and (iii) a thermoset resin formulation comprising a solid thermoset resin(s), a solid thermoset resin and a latent curing agent, or a solid thermoset resin portion of a coreactant thermoset system containing a solid and liquid or gaseous component; (b) destabilizing and dewatering said slurry; (c) collecting the solids in the form of a mat; (d) drying said mat under conditions such that said thermoset formulation remains in a heat formable state, forming said mat into a predetermined shape and, where the thermoset resin formulation is said coreactant thermoset system, saturating said mat with the liquid or gaseous component of said coreactant thermoset system; and (e) curing said mat.
Claim 2
Dependent Claim
133 words
A process for preparing a random-fiber thermoset composite comprising the steps of: (a) preparing an aqueous slurry comprising (i) a reinforcing material, (ii) binder, and (iii) a thermoset resin formulation comprising a solid thermoset resin(s), a solid thermoset resin and a latent curing agent, or a solid thermoset resin portion of a coreactant thermoset system containing a solid and liquid or gaseous component; (b) destabilizing and dewatering said slurry; (c) collecting the solids in the form of a mat; (d) drying said mat under conditions such that said thermoset formulation remains in a heat formable state, forming said mat into a predetermined shape and, where the thermoset resin formulation is said coreactant thermoset system, saturating said mat with the liquid or gaseous component of said coreactant thermoset system; and (e) curing said mat.
Claim 3
Dependent Claim
20 words
The process of claim 1 where said slurry is destabilized with a polymeric flocculant opposite in charge to said binder.
Claim 4
Dependent Claim
16 words
The process of claim 1 where prior to said curing step (e) said mat is lofted.
Claim 5
Dependent Claim
42 words
The process of claim 1 where the thermoset resin formulation in step (a) part (iii) is a coreactant thermoset system wherein said solid component is a vinyl terminated epoxy resin and in step (d) where said liquid component is a vinyl monomer.
Claim 6
Dependent Claim
11 words
The process of claim 4 where said vinyl monomer is styrene.
Claim 7
Dependent Claim
19 words
The process of claim 1 where said thermoset resin formulation is an epoxy resin and a latent curing agent.
Claim 8
Dependent Claim
14 words
The process of claim 6 where said epoxy resin is diglycidylether of bisphenol A.
Claim 9
Dependent Claim
15 words
The process of claim 6 where said latent curing agent is a diamine or anhydride.
Claim 10
Dependent Claim
19 words
The process of claim 1 where said thermoset resin formulation is a phenolic resin and a latent curing agent.
Claim 11
Dependent Claim
14 words
The process of claim 9 where said phenolic resin is a phenol formaldehyde type.
Claim 12
Dependent Claim
17 words
The process of claim 9 where said latent curing agent is urea formaldehyde, melamine formaldehyde or polyamines.
Claim 13
Dependent Claim
14 words
The process of claim 1 where said solid thermoset resin(s) is an aqueous dispersion.
References Cited (Backward Citations)
GB1263812A
Cited
US4056501A
Cited
US4295907A
Cited
EP0039292A1
Cited
US4431696A
Cited
FR2507123A1
Cited
US4426470A
Cited
US4518653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |