Patent US4535150A successfully refreshed from Google Patents.
US4535150A
Expired / Lapsed
US
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Process for preparing epoxy resins having low hydrolyzable chlorine contents
Assignee: Resolution Performance Products LLC
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Filing: 1984-12-04
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Granted: 1985-08-13
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Expires: 2004-12-04
Abstract
Abstract Low hydrolyzable chlorine containing epoxy resins are obtained by conducting a second dehydrohalogenation of the resin in isopropanol or secondary butanol solvent using aqueous alkali metal hydroxide as the dehydrohalogenating agent. Low hydrolyzable chlorine containing epoxy resins when cured have excellent electrical resistance properties.
Inventors
- 👤 Joe M. Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:33
CPC Classifications
C; C08; C08G; C08G59/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A process for preparing epoxy resins having low hydrolyzable chlorine content which comprises (a) dissolving the epoxy resin in a solvent in the amount of about 50 to about 95 weight percent resin based on the total weight of resin and solvent wherein the epoxy resin is a derivative of epichlorohydrin and a polyhydric alcohol or polyhydric phenol and which has a hydrolyzable chlorine content of at least about 0.07 weight percent, and wherein the solvent is isopropanol or secondary butanol; (b) adding aqueous alkali metal hydroxide in the amount of about 1.2 to about 33 equivalents of hydroxide per hydrolyzable chlorine equivalent of the epoxy resin; and (c) heating the reactants at an elevated temperature for a time sufficient to reduce the hydrolyzable chlorine content to the desired level.
Claim 2
Dependent Claim
130 words
A process for preparing epoxy resins having low hydrolyzable chlorine content which comprises (a) dissolving the epoxy resin in a solvent in the amount of about 50 to about 95 weight percent resin based on the total weight of resin and solvent wherein the epoxy resin is a derivative of epichlorohydrin and a polyhydric alcohol or polyhydric phenol and which has a hydrolyzable chlorine content of at least about 0.07 weight percent, and wherein the solvent is isopropanol or secondary butanol; (b) adding aqueous alkali metal hydroxide in the amount of about 1.2 to about 33 equivalents of hydroxide per hydrolyzable chlorine equivalent of the epoxy resin; and (c) heating the reactants at an elevated temperature for a time sufficient to reduce the hydrolyzable chlorine content to the desired level.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the epoxy resin is a diglycidyl ether of Bisphenol A.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the epoxy resin is a diglycidyl ether of tetrabromo Bisphenol A.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the solvent is a mixture of liquid aromatic hydrocarbon and isopropanol.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the aromatic hydrocarbon is toluene.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the solvent is a mixture of liquid aromatic hydrocarbon and secondary butanol.
Claim 9
Dependent Claim
11 words
The process of claim 7 wherein the aromatic hydrocarbon is toluene.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein the solvent is a mixture of methylisobutyl ketone and isopropanol.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein the solvent is a mixture of methylisobutyl ketone and secondary butanol.
References Cited (Backward Citations)
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Cited
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Cited
US3309384A
Cited
US3417050A
Cited
US4017523A
Cited
JPS5824578A
Cited
GB2120659A
Cited
US4447598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |