US4797464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diepoxide reacted with a half ester from a dicarboxyic acid anhydride and polyalkylene glycol
Assignee: Bayer Corp
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Filing: 1987-08-07
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Granted: 1989-01-10
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Expires: 2007-08-07
Abstract
Abstract A polyester polyol having the idealized structure: <IMAGE> where R represents the residue of a polyepoxide after ring opening with a carboxylic acid group, R' represents the residue of a cyclic anhydride, n is a number of from 4 to 25, m represents the number of epoxy groups of the polyepoxide ring opened with carboxylic acid groups, and R'' represents -H or -CH3.
Inventors
- 👤 Neil H. Nodelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:10
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4244; C08G18/4247; C08G18/4252; C08G18/4294; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A polyester polyol having the idealized structure: ##STR5## where R represents the residue of a polyepoxide after ring opening with a carboxylic acid group, R' represents the residue of a cyclic anhydride, n is a number of from 4 to 25, m represents the number of epoxy groups of the polyepoxide ring opened with carboxylic acid groups, and R" represents --H or --CH 3 .
Claim 2
Dependent Claim
65 words
A polyester polyol having the idealized structure: ##STR5## where R represents the residue of a polyepoxide after ring opening with a carboxylic acid group, R' represents the residue of a cyclic anhydride, n is a number of from 4 to 25, m represents the number of epoxy groups of the polyepoxide ring opened with carboxylic acid groups, and R" represents --H or --CH 3 .
Claim 3
Dependent Claim
11 words
The polyester of claim 1 wherein m is 2 or 3.
Claim 4
Dependent Claim
9 words
The polyester of claim 2 wherein m is 2.
Claim 5
Dependent Claim
9 words
The polyester of claim 2 wherein R" is --H.
Claim 6
Dependent Claim
11 words
The polyester of claim 2 wherein R" is --CH 3 .
References Cited (Backward Citations)
US4403093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |