Patent US4072804A successfully refreshed from Google Patents.
US4072804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linkable epoxy resin casting compounds
Assignee: Siemens AG
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Filing: 1975-09-26
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Granted: 1978-02-07
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Expires: 1995-09-26
Abstract
Abstract The invention provides epoxy resin casting compounds based on polyepoxides, polycarboxylic acids and/or polycarboxylic acid anhydrides with directly or latently present carboxyl functions, which can be converted by polyaddition and/or polymerization into insoluble and unmeltable cross-linked polymers. According to the invention, the carboxyl functions are replaced, at least partially, by maleic acid monoallyl ester and a polymerization-initiating radical former, the maleic acid monoallyl ester component being present in the reaction mixture in free form and/or in the form of adducts to the polyepoxide. The epoxy resin casting compounds constitute systems which can be processed in a wide temperature range and are cross-linked rapidly at elevated temperature.
Inventors
- 👤 Wolfgang Kleeberg
- 👤 Heinz Hacker
- 👤 Klaus-Robert Hauschildt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:10
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
An epoxy casting composition capable of being converted to insoluble and unmeltable crosslinked polymers by polyaddition and polymerization comprising a mixture of a polyepoxide, a polycarboxyl-containing compound selected from the group consisting of a polycarboxylic acid, a polycarboxylic acid anhydride and mixtures thereof, a polymerization-initiating radical former, and maleic acid monoallyl ester, said ester being present in said mixture as: (a) an adduct to said polyepoxide, said adduct containing free epoxy functions; or (b) free maleic acid monoallyl ester; or (c) a combination of (a) and (b).
Claim 2
Dependent Claim
87 words
An epoxy casting composition capable of being converted to insoluble and unmeltable crosslinked polymers by polyaddition and polymerization comprising a mixture of a polyepoxide, a polycarboxyl-containing compound selected from the group consisting of a polycarboxylic acid, a polycarboxylic acid anhydride and mixtures thereof, a polymerization-initiating radical former, and maleic acid monoallyl ester, said ester being present in said mixture as: (a) an adduct to said polyepoxide, said adduct containing free epoxy functions; or (b) free maleic acid monoallyl ester; or (c) a combination of (a) and (b).
Claim 3
Dependent Claim
13 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is triglycidylisocyanurate.
Claim 4
Dependent Claim
14 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is 1,3-bis-(1-glycidyl-hydantoin-3-yl)-propyl-2-glycidyl ether.
Claim 5
Dependent Claim
16 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is cyclohexane-dicarboxylic acid glycidyl ester.
Claim 6
Dependent Claim
14 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is bis-phenolA-biglycidyl ether.
Claim 7
Dependent Claim
14 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is 1-glycidyl-3-β-glycidyloxy propyl-5,5-dimethylhydantoin.
Claim 8
Dependent Claim
17 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is hexahydrophthalic acid bis glycidyl ester.
Claim 9
Dependent Claim
13 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is 1-glycidyl-3-β-glycidylpropyl-5,5-dimethylhydantoin.
Claim 10
Dependent Claim
14 words
The epoxy resin casting composition of claim 1 wherein said polyepoxide is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
Claim 11
Dependent Claim
17 words
The epoxy resin casting composition of claim 1 wherein said polycarboxylic acid anhydride is hexahydrophthalic acid anhydride.
Claim 12
Dependent Claim
17 words
The epoxy resin casting composition of claim 1 wherein said polycarboxylic acid anhydride is methylhexahydrophthalic acid anhydride.
Claim 13
Dependent Claim
17 words
The epoxy resin casting composition of claim 1 wherein said polycarboxylic acid anhydride is phthalic acid anhydride.
Claim 14
Dependent Claim
13 words
The epoxy resin casting composition of claim 1 which further contains a filler.
Claim 15
Dependent Claim
14 words
The epoxy resin casting composition of claim 1 wherein said radical former is dicumylperoxide.
References Cited (Backward Citations)
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |