US4550131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous slurry process for preparing reinforced polymeric composites
Assignee: Dow Chemical Co
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Filing: 1984-10-30
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Granted: 1985-10-29
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Expires: 2004-10-30
Abstract
Abstract An improved aqueous slurry process for preparing reinforced polymeric composites in the absence of a flocculant comprising the steps of forming an alkaline aqueous slurry comprising a reinforcing material, a heat fusible organic polymer and a binder comprising a salt of an ethylene acrylic acid copolymer having an acrylic acid content from about 12 to about 30 percent by weight copolymer solids and adjusting the pH value of the slurry such that the binder is destabilized to coagulate the slurry. A product formed by the improved process is also provided.
Inventors
- 👤 Larry D. Yats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:37
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J5/00; C08J5/04; D21H13/36; D21H13/38; D21H13/40; D21H17/00; D21H17/20; D21H17/33; D21H17/34; B; B29; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
An improved process for preparing a reinforced polymeric composite in the absence of a flocculant comprising the steps of (a) forming an alkaline aqueous slurry comprising (i) a reinforcing material, (ii) a heat fusible organic polymer, and (iii) a binder comprising a salt of an ethylene acrylic acid copolymer having an acrylic acid content from about 12 to about 30 percent by weight copolymer solids; and (b) adjusting the pH value of said slurry such that said binder is destabilized to coagulate said slurry.
Claim 2
Dependent Claim
84 words
An improved process for preparing a reinforced polymeric composite in the absence of a flocculant comprising the steps of (a) forming an alkaline aqueous slurry comprising (i) a reinforcing material, (ii) a heat fusible organic polymer, and (iii) a binder comprising a salt of an ethylene acrylic acid copolymer having an acrylic acid content from about 12 to about 30 percent by weight copolymer solids; and (b) adjusting the pH value of said slurry such that said binder is destabilized to coagulate said slurry.
Claim 3
Dependent Claim
27 words
The process of claim 1 which includes the additional steps of: (c) collecting said destabilized slurry in the form of a mat; (d) dewatering; and (e) drying.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said alkaline aqueous slurry is formed in thickened water.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said thickened water is formed by adding sufficient thickener to form a water having a viscosity of from about 1.5 to about 10 centipoises.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein said alkaline aqueous slurry includes a synthetic polymeric fiber or polyolefin pulp from about 1 to about 10 percent by weight total solids.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein said synthetic polymer fiber or polyolefin pulp is polyethylene and/or polypropylene fibers.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said reinforcing material is glass fibers.
Claim 9
Dependent Claim
29 words
The process of claim 1 wherein said binder is an ethylene acrylic acid copolymer wherein the acrylic acid content of the copolymer is 20 percent by weight copolymer solids.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the pH of said alkaline aqueous slurry is adjusted by adding an acid in an amount sufficient to destabilize said binder.
Claim 11
Dependent Claim
11 words
The process of claim 9 wherein said acid is acetic acid.
Claim 12
Dependent Claim
9 words
A product formed by the process of claim 1.
References Cited (Backward Citations)
US4426470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |