Patent US3856716A successfully refreshed from Google Patents.
US3856716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density polyurethane foams
Assignee: Evonik LIL Ltd
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Filing: 1973-08-01
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Granted: 1974-12-24
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Expires: 1993-08-01
Abstract
Abstract Flexible high density polyurethane foam is produced by a quasiprepolymerisation technique in which a ''''prepolymer composition'''' which is obtained from a diisocyanate and a copolymer of an Epsilon -caprolactone, an epoxide and a monomeric diol chain initiator; is reacted with a ''''reactant mixture'''' which is a mixture of the copolymer and monomeric diol. The prepolymer composition and reactant mixture are stable, easily handled liquids which intermix easily and react quickly with each other, the presence of the diol in the reactant mixture facilitating mixing with the prepolymer composition to ensure good foam formation.
Inventors
- 👤 V Jenkins
- 👤 D Doherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:05
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; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A METHOD OF MAKING A FLEXIBLE HIGH DENSITY POLYURETHANE FOAM WHICH COMPRISES: A. TAKING A LIQUID POLYFUNCTIONAL COPOLYMER, OF MW BETWEEN 700 AND 4,000, OF AN E-CAPROLACTONE AND AN EPOXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE AND EPICHLOROHYDRIN; B. REACTING SAID COPOLYMER WITH A DIISOCYANATE COMPOUND THEREBY TO OBTAIN A STABLE, LIQUID ISOCYANATE-TERMINATED PREPOLYMER C. DISSOLVING A DIOL OF MOLECULAR WEIGHT BELOW 140 COPOLYMERS OF MW BETWEEN 700 AND 4,000 OF AN E-CAPROLACTONE AND AN EPOXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE AND EPICHLOROHYDRIN TO FROM A LIQUID REACTANT MIXTURE WHICH IS ALSO STABLE AND READILY MISCIBLE, WITH SAID LIQUID PREPOLYMER D. DISSOLVING A BLOWING AGENT IN AT LEAST ONE OF SAID PREPOLYMER AND SAID REACTANT MIXTURE; AND E. MIXING TOGETHER SAID REACTANT MIXTURE AND SAID PREPOLYMER TO CAUSE THEM TO REACT AND THE BLOWING AGENT TO GENERATE A BLOWING GAS THEREBY TO FORM A FLEXIBLE FOAM OF DENSITY GREATER THAN 0.3 GM/CC.
Claim 2
Independent Claim
161 words
A METHOD OF MAKING A FLEXIBLE HIGH DENSITY POLYURETHANE FOAM WHICH COMPRISES: A. TAKING A LIQUID POLYFUNCTIONAL COPOLYMER, OF MW BETWEEN 700 AND 4,000, OF AN E-CAPROLACTONE AND AN EPOXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE AND EPICHLOROHYDRIN; B. REACTING SAID COPOLYMER WITH A DIISOCYANATE COMPOUND THEREBY TO OBTAIN A STABLE, LIQUID ISOCYANATE-TERMINATED PREPOLYMER C. DISSOLVING A DIOL OF MOLECULAR WEIGHT BELOW 140 COPOLYMERS OF MW BETWEEN 700 AND 4,000 OF AN E-CAPROLACTONE AND AN EPOXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE AND EPICHLOROHYDRIN TO FROM A LIQUID REACTANT MIXTURE WHICH IS ALSO STABLE AND READILY MISCIBLE, WITH SAID LIQUID PREPOLYMER D. DISSOLVING A BLOWING AGENT IN AT LEAST ONE OF SAID PREPOLYMER AND SAID REACTANT MIXTURE; AND E. MIXING TOGETHER SAID REACTANT MIXTURE AND SAID PREPOLYMER TO CAUSE THEM TO REACT AND THE BLOWING AGENT TO GENERATE A BLOWING GAS THEREBY TO FORM A FLEXIBLE FOAM OF DENSITY GREATER THAN 0.3 GM/CC.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1 in which at least one liquid copolymer of epsilon -caprolactone and ethylene oxide is present which contains between 10 and 70% by weight of ethylene oxide.
Claim 4
Dependent Claim
16 words
A method as claimed in claim 1 in which the diisocyanate is 4,4'' diisocyanate diphenyl methane.
Claim 5
Dependent Claim
18 words
A method as claimed in claim 1 in which the low molecular weight diol is butane 1,4 diol.
References Cited (Backward Citations)
US2962455A
Cited
US3591561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |