US3915923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution process for making polyurethane
Assignee: Lyondell Chemical Technology LP
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Filing: 1970-10-26
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Granted: 1975-10-28
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Expires: 1990-10-26
Abstract
Abstract Multistep solution process for making high molecular weight, thermoplastic polycaprolactone polyurethane which involves (1) making an isocyanate end-blocked polycaprolactone, (2) chain extending with a stoichiometric excess of a diol, and (3) incrementally reacting diisocyanate with the product of (2) until the desired viscosity is reached. The product is an excellent coating vehicle and adhesive.
Inventors
- 👤 Robert J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4266; C08G18/4269; C08G18/4277; C08G18/08; C08G18/10; C08G18/12; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
THE SOLUTION PROCESS FOR MANFACTURING A THERMOPLASTIC. HIGH MOLECULIR WEIGHT POLY-EPSILON-CAPROLACTONE POLYESTER POLYURETHANE, WHICH COMPRISES THE STEPS OF: A. REACTING A DIHYDROXYL TERMINATED POLYCAPROLACTONE WITH A STOICHIOMETRIC EXCESS OF AN ORGANIC DIISOCYANATE TO PRODUCE A PREPOLYMER CONTAINING -NCO CHAIN TERMINATING GROUPS, B. REACTING AN AMOUNT OF THE PREPOLYMER OF (A) WITH A STOICHIOMETRIC EXCESS OF AN ORGANIC DIOL TO PRODUCE A SECOND STAGE PREPOLYMER CONTAINING FREE HYDROXYL GROUPS, AND C. INCREMENTALLY ADDING MORE ORGANIC DIISOCYANATE TO THE SECOND STAGE PREPOLYMER OF (B) UNTIL A POLYMER IS PRODUCED HAVING A REDUCED VISCOSITY DETERMINED FROM 2 GRAMS OF THE POLYMER DISSOLVEDIN 100 MILLILITERS OF N,NDIMETHYLFORMAMIDE OF AT LEAST ABOUT 0.1, SAID STEPS (A), (B) AND (C) BEING CARRIED OUT AS A LIQUID HOMOGENEOUS PHASE MIXTURE IN A POLAR SOLVENT FOR THE REACTANTS AND RESULTING POLYMER AND AT A TEMPERATURE OF ABOUT 35*C. TO ABOUT 140*C.
Claim 2
Dependent Claim
143 words
THE SOLUTION PROCESS FOR MANFACTURING A THERMOPLASTIC. HIGH MOLECULIR WEIGHT POLY-EPSILON-CAPROLACTONE POLYESTER POLYURETHANE, WHICH COMPRISES THE STEPS OF: A. REACTING A DIHYDROXYL TERMINATED POLYCAPROLACTONE WITH A STOICHIOMETRIC EXCESS OF AN ORGANIC DIISOCYANATE TO PRODUCE A PREPOLYMER CONTAINING -NCO CHAIN TERMINATING GROUPS, B. REACTING AN AMOUNT OF THE PREPOLYMER OF (A) WITH A STOICHIOMETRIC EXCESS OF AN ORGANIC DIOL TO PRODUCE A SECOND STAGE PREPOLYMER CONTAINING FREE HYDROXYL GROUPS, AND C. INCREMENTALLY ADDING MORE ORGANIC DIISOCYANATE TO THE SECOND STAGE PREPOLYMER OF (B) UNTIL A POLYMER IS PRODUCED HAVING A REDUCED VISCOSITY DETERMINED FROM 2 GRAMS OF THE POLYMER DISSOLVEDIN 100 MILLILITERS OF N,NDIMETHYLFORMAMIDE OF AT LEAST ABOUT 0.1, SAID STEPS (A), (B) AND (C) BEING CARRIED OUT AS A LIQUID HOMOGENEOUS PHASE MIXTURE IN A POLAR SOLVENT FOR THE REACTANTS AND RESULTING POLYMER AND AT A TEMPERATURE OF ABOUT 35*C. TO ABOUT 140*C.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the dihydroxyl terminated polycaprolactone is formed by reaction of epsilon-caprolactone with diethylene glycol and has a molecular weight of from about 500 to about 15,000.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the diisocyanate is toluene diisocyanate.
Claim 5
Dependent Claim
11 words
The process of claim 2 wherein the diisocyanate is p,p''-diphenylmethane diisocyanate.
Claim 6
Dependent Claim
16 words
The process of claim 2 wherein the reduced viscosity of the polymer is at least 0.4.
References Cited (Backward Citations)
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US3377308A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |