US4492789A
Expired / Lapsed
US
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Epoxy resin composition
Assignee: Resonac Corp
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Filing: 1983-04-01
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Granted: 1985-01-08
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Expires: 2003-04-01
Abstract
Abstract An epoxy resin composition comprising (a) an epoxy resin, (b) a lactone obtained by decarboxylation condensation reaction of a saturated alicyclic 1,2-dicarboxylic acid anhydride, and if necessary (c) a curing agent for the epoxy resin and (d) a curing accelerator gives a cured article showing almost no or very slight curing shrinkage.
Inventors
- 👤 Kazuhide Nakashima
- 👤 Takayuki Saito
- 👤 Takeshi Nakahara
- 👤 Shigeo Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:20
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/625; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
An epoxy resin composition comprising (a) an epoxy resin, and (b) a lactone represented by the formula: ##STR9## wherein the group represented by R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 and R 13 are independently hydrogen or an alkyl group having 1 to 5 carbon atoms, at least one of said group being an alkyl group.
Claim 2
Dependent Claim
69 words
An epoxy resin composition comprising (a) an epoxy resin, and (b) a lactone represented by the formula: ##STR9## wherein the group represented by R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 and R 13 are independently hydrogen or an alkyl group having 1 to 5 carbon atoms, at least one of said group being an alkyl group.
Claim 3
Dependent Claim
19 words
An epoxy resin composition according to claim 1, which further comprises (c) a curing agent for the epoxy resin.
Claim 4
Dependent Claim
24 words
An epoxy resin composition according to claim 1, which further comprises: (c) a curing agent for the epoxy resin, and (d) a curing accelerator.
Claim 5
Dependent Claim
38 words
An epoxy resin composition according to claim 1, 2 or 3, wherein the lactone (b) is represented by the formula: ##STR10## wherein R 14 and R 15 are independently an alkyl group having 1 to 5 carbon atoms.
Claim 6
Dependent Claim
17 words
An epoxy resin composition according to claim 1, 2 or 3 wherein the lactone (b) is ##STR11##
Claim 7
Dependent Claim
17 words
An epoxy resin composition according to claim 1, 2 or 3, wherein the lactone (b) is ##STR12##
Claim 8
Dependent Claim
34 words
An epoxy resin composition accoding to claim 1, wherein the lactone (b) is used in an amount of 0.01 to 1 mole per equivalent amount of the epoxy group in the epoxy resin (a).
Claim 9
Dependent Claim
61 words
An epoxy resin composition according to claim 2, wherein the lactone (b) is used in an amount of 0.01 to 1 mole, the curing agent (c) is used in an amount of upto 1.5 moles, and the total of the compounds (b) and (c) is 0.01 to 1.51 moles per equivalent amount of the epoxy group in the epoxy resin (a).
Claim 10
Dependent Claim
53 words
An epoxy resin composition according to claim 3, wherein the components (b) and (c) are used in a total amount of 0.01 to 1.51 moles and the component (d) is used in an amount of 0.01 to 10 party by weight, per equivalent amount of the epoxy group in the epoxy resin (a).
Claim 11
Dependent Claim
35 words
A composition according to claim 2 or 3, wherein the curing agent (c) is phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 3,6-endomethylene-tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl-3,6-endomethylenetetrahydrophthalic anhydride, dodecenylsuccinic anhydride, trimellitic anhydride, or pyromellitic anhydride.
Claim 12
Dependent Claim
36 words
A composition according to claim 3, wherein the curing accelerator (d) is a tertiary amine, a salt of tertiary amine, a quaternary ammonium compound, an alkali metal alcoholate, or a metal salt of a fatty acid.
References Cited (Backward Citations)
DE1142863B
Cited
US3203920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |