Patent US4124572A successfully refreshed from Google Patents.
US4124572A
Expired / Lapsed
US
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Thermoplastic polyurethane elastomer
Assignee: Uniroyal Chemical Co Inc
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Filing: 1977-07-05
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Granted: 1978-11-07
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Expires: 1997-07-05
Abstract
Abstract Thermoplastic polyurethanes prepared from a reaction mixture comprising: (a) a poly(oxypropylene)-poly(oxyethylene) glycol of molecular weight from 1000 to about 3000 containing 25-60% by weight oxyethylene groups; (b) a polyester polyol of molecular weight from 1000 to about 3000; (c) a polyisocyanate; and (d) a low molecular weight polyol chain extender. The elastomers are useful in automotive product applications, cattle ear tags, coatings and coated fabrics.
Inventors
- 👤 Chung-Ling Mao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/40; C08G18/4009; C08G18/4018
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A thermoplastic polyurethane elastomer which is a reaction product of: (a) a poly(oxypropylene)-poly(oxyethylene) glycol of molecular weight from 1000 to 3000 containing 25-60% by weight oxyethylene groups; (b) a chain extended polyester polyol of molecular weight from 1000 to 3000; (c) a polyisocyanate selected from the group consisting of 2,4-tolylene diisocyanate, methylenebis (4-phenylisocyanate), 4,4'-diisocyanatodicyclohexylmethane and isophorone diisocyanate; and (d) a low molecular weight polyol chain extender, the ratio of (a) to (b) being from 10/90 to 90/10 by weight, the molar ratio of (d) to (a) plus (b) being from 3:1 to 10:1 and the NCO/OH equivalence ratio being from 0.95:1 to 1.10:1, said elastomer having a hardness of from 80 Shore A to 55 Shore D, an elongation of greater than 300%, an ultimate tensile length of at least 4,000 psi and a Die C tear Strength of at least 500 pli.
Claim 2
Dependent Claim
143 words
A thermoplastic polyurethane elastomer which is a reaction product of: (a) a poly(oxypropylene)-poly(oxyethylene) glycol of molecular weight from 1000 to 3000 containing 25-60% by weight oxyethylene groups; (b) a chain extended polyester polyol of molecular weight from 1000 to 3000; (c) a polyisocyanate selected from the group consisting of 2,4-tolylene diisocyanate, methylenebis (4-phenylisocyanate), 4,4'-diisocyanatodicyclohexylmethane and isophorone diisocyanate; and (d) a low molecular weight polyol chain extender, the ratio of (a) to (b) being from 10/90 to 90/10 by weight, the molar ratio of (d) to (a) plus (b) being from 3:1 to 10:1 and the NCO/OH equivalence ratio being from 0.95:1 to 1.10:1, said elastomer having a hardness of from 80 Shore A to 55 Shore D, an elongation of greater than 300%, an ultimate tensile length of at least 4,000 psi and a Die C tear Strength of at least 500 pli.
Claim 3
Dependent Claim
35 words
A thermoplastic polyurethane elastomer as in claim 1 in which the said polyester polyol (b) is selected from the group consisting of polycaprolactone diol and a reaction product of 1,6-hexanediol, adipic acid and isophthalic acid.
Claim 4
Dependent Claim
14 words
A thermoplastic polyurethane as in claim 2, having a hardness of 40-55 Shore D.
Claim 5
Dependent Claim
14 words
A thermoplastic polyurethane as in claim 2, having a hardness of 80-90 Shore A.
Claim 6
Dependent Claim
62 words
A thermoplastic polyurethane elastomer as in claim 2 in which the molecular weight of (a) is 2000 and the oxyethylene group content is 30-50%, (b) is polycaprolactonediol having a molecular weight of 2,000, (c) is methylenebis(4-phenylisocyanate), (d) is 1,4-butanediol, the ratio of (a) to (b) is from 80/20 to 40/60 by weight, and the NCO/OH equivalence ratio is from 1.00:1 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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |