Patent US4379327A successfully refreshed from Google Patents.
US4444924A
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High strength carbonate containing resin composition and its method of manufacture
Assignee: Siemens AG
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Filing: 1982-09-28
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Granted: 1984-04-24
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Expires: 2002-09-28
Abstract
Abstract The invention relates to a filled, resin composition and a method for the manufacture therefor. The composition is a matrix of an epoxy resin, a carbonate-containing filler, particularly calcium-magnesium carbonate or calcium carbonate, an anhydride hardener and an adhesive at 0.1 to 3.0 percent by weight, relative to the weight of the filler. The adhesive is a multibasic organic acid, an organic hydroxy acid such as malic acid or an amino acid. In the process, the adhesive can first be added to the hardener or to the filler containing resin before hardener is added.
Inventors
- 👤 Rudolf Grimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/14; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08K; C08K9/00; C08K9/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
59 words
A filled resin composition comprising an epoxy resin interbonded with an anhydride hardener, a multibasic hydroxyorganic, organic or inorganic acid adhesive, and a carbonate salt filler wherein the hardened resin and the filler are interbonded by the adhesive and the adhesive is present in an amount of about 0.1 to 3 percent by weight relative to the filler weight.
Claim 2
Dependent Claim
59 words
A filled resin composition comprising an epoxy resin interbonded with an anhydride hardener, a multibasic hydroxyorganic, organic or inorganic acid adhesive, and a carbonate salt filler wherein the hardened resin and the filler are interbonded by the adhesive and the adhesive is present in an amount of about 0.1 to 3 percent by weight relative to the filler weight.
Claim 3
Dependent Claim
40 words
A composition according to claim 1 wherein the epoxy resin is a bisphenol methane epoxy resin, an epoxy hydantoin resin, an epoxy formaldehyde resin, a phenol-formaldehyde epoxy resin, an epoxy glycidyl ester resin or a cycloaliphatic dicarboxylic acid epoxy resin.
Claim 4
Dependent Claim
20 words
A composition according to claim 1 wherein the anhydride hardener is phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride or diglycidic anhydride.
Claim 5
Dependent Claim
14 words
A composition according to claim 1 wherein the filler is calcium or magnesium carbonate.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein the filler is dolomite or calcite.
Claim 7
Dependent Claim
19 words
A composition according to claim 1, 2, 3, 4 or 5 wherein the adhesive is a multibasic organic acid.
Claim 8
Dependent Claim
19 words
A composition according to claim 1, 2, 3, 4 or 5 wherein the adhesive is a multibasic inorganic acid.
Claim 9
Dependent Claim
20 words
A composition according to claim 1, 2, 3, 4 or 5 wherein the adhesive is a multibasic hydroxy organic acid.
Claim 10
Dependent Claim
32 words
A composition according to claim 1, 2, 3, 4 or 5 wherein the adhesive is malic acid, citric acid, tartaric acid, tartronic acid, succinic acid, fumaric acid, glutamine, asparagine or adipic acid.
Claim 11
Dependent Claim
126 words
A process for the preparation of a composition according to claim 1, which comprises: heating the epoxy resin to a temperature where it is fluid; mixing the filler with the resin to form a substantially dispersed slurry of filler in the resin; adding warmed adhesive followed by adding warmed anhydride hardener to the slurry, or adding a warmed solution of adhesive and anhydride hardener to the slurry, to form a reactive mixture, the adhesive and hardener or solution being warmed to about the same temperature as the slurry, and the adhesive being about 0.1 to 3 percent by weight of the weight of the filler; and heating the reactive mixture at a temperature of from about 60° C. to about 150° C. until it has set.
Claim 12
Dependent Claim
17 words
A process according to claim 10 comprising adding the solution of adhesive and hardener to the slurry.
Claim 13
Dependent Claim
18 words
A process according to claim 10 comprising adding sequentially the adhesive and then the hardener to the slurry.
Claim 14
Dependent Claim
20 words
A process according to claim 10, 11 or 12 comprising allowing the reactive mixture to thermoset in a molded form.
Claim 15
Dependent Claim
24 words
A process according to claim 10 wherein the resin is an epoxy resin, an epoxy-hydantoin resin, an epoxy-formaldehyde resin or an epoxy-glycidyl ester resin.
Claim 16
Dependent Claim
16 words
A process according to claim 10 wherein the adhesive is a multibasic organic or inorganic acid.
Claim 17
Dependent Claim
27 words
A process according to claim 10 wherein the adhesive is malic acid, citric acid, adipic acid, tartaric acid, tartronic acid, succinic acid, fumaric acid, glutamine or asparagine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |