Patent US4528345A successfully refreshed from Google Patents.
US4528345A
Expired / Lapsed
US
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Weather-resistant epoxy coatings
Assignee: Huntsman Corp
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Filing: 1983-03-04
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Granted: 1985-07-09
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Expires: 2003-03-04
Abstract
Abstract A method for making weather-resistant epoxy coatings using cycloaliphatic diepoxy resins is disclosed. The method comprises pre-reacting these cycloaliphatic diepoxy resins with aminoethylpiperazine and then combining the reaction product with a curing amount of polyoxyalkylene polyamine and an accelerator.
Inventors
- 👤 Harold G. Waddill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:20
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G59/40; C08G59/50; C08G59/504; C08G59/5046; C08G59/5053; C08G59/5073
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A method for making weather-resistant epoxy coatings comprising (a) reacting aminoethylpiperazine with a cycloaliphatic diepoxy resin at room temperature to about 150° C. wherein the amount of aminoethylpiperazine reacted is the amount which will ensure a maximum level of primary amine reaction but give a reaction product which is not too viscous to handle and then (b) combining the reaction product of (a) with a curing amount of polyoxyalkylene polyamine and an accelerator which contributes little or no yellowing during the weathering process.
Claim 2
Independent Claim
83 words
A method for making weather-resistant epoxy coatings comprising (a) reacting aminoethylpiperazine with a cycloaliphatic diepoxy resin at room temperature to about 150° C. wherein the amount of aminoethylpiperazine reacted is the amount which will ensure a maximum level of primary amine reaction but give a reaction product which is not too viscous to handle and then (b) combining the reaction product of (a) with a curing amount of polyoxyalkylene polyamine and an accelerator which contributes little or no yellowing during the weathering process.
Claim 3
Dependent Claim
21 words
A method as in claim 1 wherein the reaction in (a) takes place at from about 80° C. to 125° C.
Claim 4
Dependent Claim
18 words
A method as in claim 1 wherein the polyoxyalkylene polyamine is a triamine of about 400 molecular weight.
Claim 5
Dependent Claim
18 words
A method as in claim 1 wherein the polyoxyalkylene polyamine is a diamine of about 230 molecular weight.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |