Patent US4581441A successfully refreshed from Google Patents.
US4581441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of special cycloaliphatic 1,2-diepoxides and their use
Assignee: Bayer AG
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Filing: 1984-11-13
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Granted: 1986-04-08
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Expires: 2004-11-13
Abstract
Abstract This invention relates to a mixture of from 60 to 95% by weight of a diglycidyl ester of hexahydrophthalic acids and from 5 to 40% by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate. In combination with conventional polycarboxylic acid anhydrides as hardeners, this mixture is used for the production of molded bodies with excellent weathering resistance, good electrical properties and surprisingly good mechanical properties.
Inventors
- 👤 Frank Kleiner
- 👤 Rolf Kubens
- 👤 Heinrich Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:25
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/226
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
A mixture comprising: 60-95% by weight of at least one diglycidyl ester of hexahydrophthalic acid, and 5-40% by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
Claim 2
Dependent Claim
22 words
A mixture comprising: 60-95% by weight of at least one diglycidyl ester of hexahydrophthalic acid, and 5-40% by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
Claim 3
Dependent Claim
27 words
A mixture as claimed in claim 1, comprising: 70-95% by weight of at least one diglycidyl ester of hexahydrophthalic acid, and 5-30% by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
Claim 4
Dependent Claim
64 words
A process for the production of molded epoxide resin products, which comprises hardening a mixture as claimed in claim 1 with from 0.6 to 1.2 anhydride equivalents of a polycarboxylic acid anhydride per epoxide equivalent at a temperature of from 60° to 180° C., optionally under excess pressure and optionally in the presence of a conventional hardening accelerator, filler, dye, pigment or reinforcing material.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 3, wherein from 0.9 to 1.1 anhydride equivalents are used per epoxide equivalent.
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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |