US4444977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable oxirane formulations
Assignee: Dow Chemical Co
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Filing: 1983-03-07
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Granted: 1984-04-24
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Expires: 2003-03-07
Abstract
Abstract This invention is an aqueous-dispersible oxirane formulation comprising an oxirane and a cross-linking amount of 3-hydroxythiophane and an organic acid having at least 2 acid moieties that have a dissociation constant, pK a , less than 4.75.
Inventors
- 👤 Kiyoshi I. Aikawa
- 👤 Ritchie A. Wessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:12
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C07; C07C; C07C45/00; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/30; C07D333/32; C08G59/42; C08G59/4284; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
An oxirane formulation comprising the reaction product of an oxirane and a cross-linking amount of 3-hydroxythiophane and an organic acid having at least 2 acid moieties that have a dissociation constant, pK a , less than 4.75.
Claim 2
Dependent Claim
37 words
An oxirane formulation comprising the reaction product of an oxirane and a cross-linking amount of 3-hydroxythiophane and an organic acid having at least 2 acid moieties that have a dissociation constant, pK a , less than 4.75.
Claim 3
Dependent Claim
30 words
The formulation of claim 1 wherein the oxirane is an epoxy resin having more than one oxirane moiety per molecule and a minimum molecular weight (M w ) of 300.
Claim 4
Dependent Claim
12 words
The formulation of claim 1 wherein the acid is a carboxylic acid.
Claim 5
Dependent Claim
26 words
The formulation of claim 3 wherein the acid has one carboxylic acid moiety having a pK a in the range from about 1 to about 4.
Claim 6
Dependent Claim
19 words
The formulation of claim 1 wherein the acid is trimesic, terephthalic, phthalic, isophthalic, trimelletic, pyromelletic, formic, maleic and hydroxyacetic.
Claim 7
Dependent Claim
10 words
The formulation of claim 1 wherein the acid is trimesic.
Claim 8
Dependent Claim
37 words
A process for curing the formulation of claim 1 which comprises subjecting the formulation to conditions sufficient to form a sulfonium salt and then heating the salt to dryness to cure the salt to a water-insoluble solid.
Claim 9
Dependent Claim
22 words
The formulation of claim 1 wherein the oxirane and acid are employed in an excess to the 3-hydroxythiophane on an equivalent basis.
References Cited (Backward Citations)
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US3793278A
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US4020030A
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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 |