Patent US4518749A successfully refreshed from Google Patents.
US4518749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin curatives
Assignee: Texaco Inc
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Filing: 1983-11-07
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Granted: 1985-05-21
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Expires: 2003-11-07
Abstract
Abstract An epoxy resin composition is disclosed. The composition comprises a polyepoxide and a curing amount of a bis(hydrogen maleate) derivative of a polyoxypropylenediamine. This composition when cured produces unexpectedly superior encapsulations which are more flexible and less brittle than those of the prior art.
Inventors
- 👤 Harold G. Waddill
- 👤 Heinz Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:48
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/331; C08G65/332; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/423; C08G59/44; C08G59/46; C08G59/48
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
An epoxy resin composition comprising: (A) a vicinal polyepoxide having an average of at least 1.8 reactive 1,2-epoxy groups per molecule and (B) a curing amount of the curing agent: ##STR3## wherein C is carbon, N is nitrogen, H is hydrogen, O is oxygen and R is the radical --CH(CH.sub.3)CH.sub.2 [OCH.sub.2 CH(CH.sub.3)].sub.x -- wherein x is an integer of from 2 to 35, and (C) anhydride in a weight ratio of curing agent to anhydride of 1:5 to 5:1.
Claim 2
Dependent Claim
79 words
An epoxy resin composition comprising: (A) a vicinal polyepoxide having an average of at least 1.8 reactive 1,2-epoxy groups per molecule and (B) a curing amount of the curing agent: ##STR3## wherein C is carbon, N is nitrogen, H is hydrogen, O is oxygen and R is the radical --CH(CH.sub.3)CH.sub.2 [OCH.sub.2 CH(CH.sub.3)].sub.x -- wherein x is an integer of from 2 to 35, and (C) anhydride in a weight ratio of curing agent to anhydride of 1:5 to 5:1.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein R has a molecular weight of from 200 to 2100.
Claim 4
Dependent Claim
16 words
The composition of claim 1 wherein R has a molecular weight of from 200 to 500.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein x averages from 2 to 6.
Claim 6
Dependent Claim
9 words
The composition of claim 1 wherein x averages 5.6.
Claim 7
Dependent Claim
9 words
The composition of claim 1 wherein x averages 2.6.
Claim 8
Dependent Claim
81 words
An epoxy resin composition comprising: (A) a vicinal polyepoxide having an average of at least 1.8 reactive 1,2-epoxy groups per molecule and (B) a curing amount of the curing agent: ##STR4## wherein C is carbon, N is nitrogen, H is hydrogen, O is oxygen and R is the radical --CH(CH.sub.3)CH.sub.2 [OCH.sub.2 CH(CH.sub.3)].sub.x -- wherein x is an integer of from 2 to 35, and (C) carboxylic acid in a weight ratio of curing agent to carboxylic acid of 1:5 to 5:1.
Claim 9
Dependent Claim
81 words
An epoxy resin composition comprising: (A) a vicinal polyepoxide having an average of at least 1.8 reactive 1,2-epoxy groups per molecule and (B) a curing amount of the curing agent: ##STR4## wherein C is carbon, N is nitrogen, H is hydrogen, O is oxygen and R is the radical --CH(CH.sub.3)CH.sub.2 [OCH.sub.2 CH(CH.sub.3)].sub.x -- wherein x is an integer of from 2 to 35, and (C) carboxylic acid in a weight ratio of curing agent to carboxylic acid of 1:5 to 5:1.
Claim 10
Dependent Claim
16 words
The composition of claim 7 wherein R has a molecular weight of from 200 to 2100.
Claim 11
Dependent Claim
16 words
The composition of claim 7 wherein R has a molecular weight of from 200 to 500.
Claim 12
Dependent Claim
12 words
The composition of claim 7 wherein x averages from 2 to 6.
Claim 13
Dependent Claim
9 words
The composition of claim 7 wherein x averages 5.6.
Claim 14
Dependent Claim
9 words
The composition of claim 7 wherein x averages 2.6.
Claim 15
Dependent Claim
11 words
The composition of claim 7 wherein the anhydride is 1-methyl-3,6-endomethylene-4-cyclohexene-1,2-dicarboxylic anhydride.
References Cited (Backward Citations)
US4113697A
Cited
US4115361A
Cited
US4115360A
Cited
US4147857A
Cited
US4169177A
Cited
US4304889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |