US4130549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing epoxy resins from hydroxy benzoic acid and bisphenol
Assignee: VENOSEIYAKU OYO KENKYUSO KK
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Filing: 1978-02-21
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Granted: 1978-12-19
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Expires: 1998-02-21
Abstract
Abstract A process for preparing an epoxy resin, which comprises reacting p-hydroxybenzoic acid and bisphenol A with an epihalohydrin in the presence of a base using a quaternary ammonium salt as a catalyst, the amount of the p-hydroxybenzoic acid being 10 to 90 mole% and the amount of the bisphenol A being 90 to 10 mole%, both based on the total amount of the hydroxybenzoic acid and bisphenol A.
Inventors
- 👤 Ryuzo Ueno
- 👤 Hiroyasu Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:54
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/063
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A process for preparing an epoxy resin, which comprises reacting p-hydroxybenzoic acid and bisphenol A with an epihalohydrin in the presence of a base using a quaternary ammonium salt as a catalyst, the amount of the p-hydroxybenzoic acid being 10 to 90 mole% and the amount of the bisphenol A being 90 to 10 mole%, both based on the total amount of the hydroxybenzoic acid and bisphenol A.
Claim 2
Dependent Claim
68 words
A process for preparing an epoxy resin, which comprises reacting p-hydroxybenzoic acid and bisphenol A with an epihalohydrin in the presence of a base using a quaternary ammonium salt as a catalyst, the amount of the p-hydroxybenzoic acid being 10 to 90 mole% and the amount of the bisphenol A being 90 to 10 mole%, both based on the total amount of the hydroxybenzoic acid and bisphenol A.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the quaternary ammonium salt is a benzyl trialkyl-type compound or a tetra-alkyl-type compound.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the epihalohydrin is epichlorohydrin.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the base is an alkali hydroxide.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the reaction is carried out at 50° to 120° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |