US3676397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxazolidinone-containing epoxy resins and process for their preparation
Assignee: Dow Chemical Co
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Filing: 1970-10-12
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Granted: 1972-07-11
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Expires: 1990-10-12
Abstract
Abstract Novel oxazolidinone-modified epoxy resins are prepared by reacting a polyglycidyl ether of a polyhydric compound such as the diglycidyl ether of bisphenol A with cyanuric acid or thiocyanuric acid at a temperature in the range of 130* to 180* C. The oxazolidinone-modified epoxy resins prepared in this manner have a different structure and exhibit greater Izod impact strengths as compared to the oxazolidinone-modified epoxy resins prepared from polyisocyanates and polyglycidyl ethers.
Inventors
- 👤 James A Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:58
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
32 words
The oxazolidinone modified epoxy resin of claim 1 wherein Z is the residue of a diglycidyl ether of an aromatic polyhydric compound and n has a value of from 1 to 3.
Claim 2
Dependent Claim
19 words
The oxazolidinone-modified epoxy resin of claim 2 wherein Z is the residue of the diglycidyl ether of p,p''-isopropylidine diphenol.
Claim 3
Dependent Claim
20 words
The oxazolidinone-modified epoxy resin of claim 1 wherein Z is the residue of the diglycidyl ether of hydrogenated p,p''-isopropylidine diphenol.
Claim 4
Dependent Claim
20 words
The oxazolidinone-modified epoxy resin of claim 1 wherein Z is the residue of the diglycidyl ether of a polyoxyalkylene glycol.
Claim 5
Dependent Claim
17 words
The oxazolidinone-modified epoxy resin of claim 5 wherein Z is the diglycidyl ether of a polyoxypropylene glycol.
Claim 6
Dependent Claim
18 words
The oxazolidinone-modified epoxy resin of claim 6 wherein the polyoxypropylene glycol has a molecular weight of about 400.
Claim 7
Dependent Claim
22 words
The oxazolidinone-modified epoxy resin of claim 1 wherein Z is the residue of a polyglycidyl ether having more than two epoxy groups.
Claim 8
Dependent Claim
20 words
The oxazolidinone-modified epoxy resin of claim 8 wherein Z is the residue of the polyglycidyl ether of a novolac resin.
Claim 9
Dependent Claim
26 words
The oxazolidinone-modified epoxy resin of claim 9 wherein Z is the residue of the polyglycidyl ether of a novolac resin having a functionality of about 3.5.
Claim 10
Dependent Claim
19 words
The oxazolidinone modified epoxy resin of claim 1 wherein Z is the residue of the diglycidyl ether of neopentylglycol.
Claim 11
Dependent Claim
20 words
The oxazolidinone modified epoxy resin of claim 11 wherein n has a value of from about 4 to about 10.
Claim 12
Dependent Claim
32 words
A thermoset table composition comprising an oxazolidinone-modified polyglycidyl ether of a polyhydric compound of claim 1 and a catalytic amount of a catalyst or a curing amount of a curing agent therefor.
Claim 13
Dependent Claim
20 words
The thermoset table composition of claim 13 wherein the polyhydric compound is p,p''-isopropylidene diphenol and the curing agent is methylenedianiline.
Claim 14
Dependent Claim
20 words
The thermoset table composition of claim 14 wherein the polyhydric compound is neopentyl glycol and the curing agent is dicyandiamide.
Claim 15
Dependent Claim
10 words
The product resulting from curing the composition of claim 13.
Claim 16
Dependent Claim
10 words
The product resulting from curing the composition of claim 14.
Claim 17
Dependent Claim
10 words
The product resulting from curing the composition of claim 15.
References Cited (Backward Citations)
US2947726A
Cited
US3194810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |