US3725341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of high molecular weight polyepoxides from polyepoxides and polyhydroxyl-containing compounds
Assignee: Dow Chemical Co
•
Filing: 1971-06-23
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Granted: 1973-04-03
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Expires: 1991-06-23
Abstract
Abstract The invention concerns a process for preparing epoxy resins of increased molecular weight by reacting a polyepoxide such as the diglycidyl ether of bisphenol-A with a polyhydroxyl-containing compound, such as bisphenol-A in the presence of an organometallic compound of tin, germanium, silicon and lead, such as trimethyltin chloride.
Inventors
- 👤 M Rogers
- 👤 J Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:10
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/02; C08G59/04; C08G59/06; C08G59/066
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the catalyst is an organotin compound.
Claim 2
Dependent Claim
22 words
The process of claim 2 wherein the polyepoxide is the diglycidyl ether of bisphenol A and the polyhydroxyl-containing compound is bisphenol A.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is an organosilicon compound.
Claim 4
Dependent Claim
22 words
The process of claim 4 wherein the polyepoxide is the diglycidyl ether of bisphenol A and the polyhydroxyl-containing compound is bisphenol A.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the catalyst is an organo lead compound.
Claim 6
Dependent Claim
22 words
The process of claim 6 wherein the polyepoxide is the diglycidyl ether of bisphenol A and the polyhydroxyl-containing compound is bisphenol A.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is an organogermanium compound.
Claim 8
Dependent Claim
22 words
The process of claim 8 wherein the polyepoxide is the diglycidyl ether of bisphenol A and the polyhydroxyl-containing compound is bisphenol A.
References Cited (Backward Citations)
US3150116A
Cited
US3398211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |