US3899467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes from 3,3-{40 dimethyl-diphenyl-4,4{40 -diisocyanate polyester diols and bis(hydroxyethyl ether) of hydroquinone
Assignee: Pharmacia and Upjohn Co
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Filing: 1974-05-14
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Granted: 1975-08-12
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Expires: 1994-05-14
Abstract
Abstract Polyurethane elastomers characterized by high thermostability and thermoplasticity are obtained by reaction of 3,3''dimethyldiphenyl-4,4''-diisocyanate with a polyester diol (polycaprolactone diol preferred) and the bis(2-hydroxyethyl ether) of hydroquinone. The elastomers are useful in gasketing, seals, o-rings, wire coatings and like applications in which service temperatures of 120*C or even higher are a requisite.
Inventors
- 👤 Henry W Bonk
- 👤 Tilak M Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7685; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; C08G18/4266; C08G18/4269; C08G18/4277; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
A HIGH TEMPERATURE RESISTANT, THEROMOPLASTIC POLYURETHANE ELASTOMER CHARACTERIZED BY THE PRESENCE THEREIN OF EACH OF THE RECURRING UNITS OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
22 words
A HIGH TEMPERATURE RESISTANT, THEROMOPLASTIC POLYURETHANE ELASTOMER CHARACTERIZED BY THE PRESENCE THEREIN OF EACH OF THE RECURRING UNITS OF THE FOLLOWING FORMULAE:
Claim 3
Dependent Claim
18 words
A polyurethane elastomer according to claim 1 wherein the group A is the residue of a polycaprolactone diol.
Claim 4
Dependent Claim
28 words
A polyurethane elastomer according to claim 1 wherein the overall proportion of units having the formula (I) to units having the formula (II) is about 1:1.5 to 1:5.
Claim 5
Dependent Claim
72 words
A polyurethane elastomer according to claim 1 which has been prepared by a one-shot reaction between 3,3''-dimethyldiphenyl-4, 4''-diisocyanate, hydroquinone bis(2-hydroxyethyl ether), and a polyester diol HO-A-OH, the proportion of equivalents of hydroquinone bis(2-hydroxyethyl ether) to polyester diol being within the range of about 1.5:1 to about 5:1 and the overall ratio of equivalents of isocyanate to combined equivalents of hydroxyl containing compounds being within the range of about 0.98:1 to about 1.10:1.
Claim 6
Dependent Claim
22 words
A polyurethane elastomer according to claim 4 wherein the polyester diol is a polycaprolactone diol have a molecular weight of about 2000.
Claim 7
Dependent Claim
44 words
A polyurethane elastomer according to claim 5 wherein the molar proportion of polycaprolactone diol to hydroquinone bis(2-hydroxyethyl ether) is approximately 1:2 and the overall ratio of equivalents of isocyanate to combined equivalents of hydroxyl containing compounds is within the range of 1.02:1 to 1.05:1.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |