US3915935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane adhesive comprising a polyester and a prepolymer of the same polyester
Assignee: USM Corp
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Filing: 1974-02-28
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Granted: 1975-10-28
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Expires: 1994-02-28
Abstract
Abstract A two-part adhesive composition curable to tough solid state by mixture and reaction of its components in which the components are two normally liquid parts, the first part including a polyester polyol having -OH functionality of from about two to about three and an equivalent weight of from about 100 to about 500 and the second part including a prepolymer of a similar polyester polyol and an organic polyisocyanate, the prepolymer having a reactive -NCO functionality from about two to three. The parts are compounded such that mixture in generally equal parts by volume will give a cure index of from about 100 to about 400. This invention is concerned with improvements in or relating to adhesive compositions.
Inventors
- 👤 Denzil S Abraham
- 👤 Austin T Carpenter
- 👤 Alan Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:46
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C09J175/06; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4219; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
A LIQUID SUBSTANTIALLY SOLVENT-FREE AND WATER-FREE ADHESIVE COMPOSITION CURABLE TO TOUGH SOLID STATE RESULTING FROM ADMIXTURE AND REACTION OF (1) A NORMALLY LIQUID SATURATED BRANCHED POLYESTER POLYOL HAVING AN -OH FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND AN EQUIVALENT WEIGHT OF FROM 100 TO 500 AND (2) A NORMALLY LIQUID PREPOLYMER HAVING A REACTIVE -NCO FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND CONTAINING FROM ABOUT 15% TO ABOUT 28% REACTIVE -NCO GROUPS BY WEIGHT OF SAID PREPOLYMER, SAID PREPOLYMER BEING THE PRODUCT OF REACTING A POLYESTER POLYOL HAVING AN -OH FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND AN EQUIVALENT WEIGHT OF FROM 100 TO 500 AND AN ORGANIC POLYISOCYANATE IN AMOUNT IN EXCESS OVER THE STIOCHIOMETRIC AMOUNT OF THE POLYESTER POYOL, SAID ADHESIVE COMPRISING FROM ABOUT 80% TO ABOUT 125% BY VOLUME OF SAID SATURATED BRANCHED CHAIN POLYESTER POLYOL RELATIVE TO THE VOLUME OF SAID NORMALLY LIQUID PREPOLYMER, THE POLYESTER POLYOL AND PREPOLYMER, BEING COMPOUNDED TO PROVIDE THAT A VOLUME OF SAID PREPOLYMER WILL CONTAIN A QUANTITY OF REACTIVE -NCO GROUPS RELATIVE TO THE QUANTITY OF REACTIVE -OH GROUPS IN THE SAME VOLUME OF SAID POLYESTERPOLYOL TO PRODUCE A CURE INDEX OF FROM ABOUT 100 TO ABOUT 140.
Claim 2
Dependent Claim
204 words
A LIQUID SUBSTANTIALLY SOLVENT-FREE AND WATER-FREE ADHESIVE COMPOSITION CURABLE TO TOUGH SOLID STATE RESULTING FROM ADMIXTURE AND REACTION OF (1) A NORMALLY LIQUID SATURATED BRANCHED POLYESTER POLYOL HAVING AN -OH FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND AN EQUIVALENT WEIGHT OF FROM 100 TO 500 AND (2) A NORMALLY LIQUID PREPOLYMER HAVING A REACTIVE -NCO FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND CONTAINING FROM ABOUT 15% TO ABOUT 28% REACTIVE -NCO GROUPS BY WEIGHT OF SAID PREPOLYMER, SAID PREPOLYMER BEING THE PRODUCT OF REACTING A POLYESTER POLYOL HAVING AN -OH FUNCTIONALITY OF FROM ABOUT TWO TO ABOUT THREE AND AN EQUIVALENT WEIGHT OF FROM 100 TO 500 AND AN ORGANIC POLYISOCYANATE IN AMOUNT IN EXCESS OVER THE STIOCHIOMETRIC AMOUNT OF THE POLYESTER POYOL, SAID ADHESIVE COMPRISING FROM ABOUT 80% TO ABOUT 125% BY VOLUME OF SAID SATURATED BRANCHED CHAIN POLYESTER POLYOL RELATIVE TO THE VOLUME OF SAID NORMALLY LIQUID PREPOLYMER, THE POLYESTER POLYOL AND PREPOLYMER, BEING COMPOUNDED TO PROVIDE THAT A VOLUME OF SAID PREPOLYMER WILL CONTAIN A QUANTITY OF REACTIVE -NCO GROUPS RELATIVE TO THE QUANTITY OF REACTIVE -OH GROUPS IN THE SAME VOLUME OF SAID POLYESTERPOLYOL TO PRODUCE A CURE INDEX OF FROM ABOUT 100 TO ABOUT 140.
Claim 3
Dependent Claim
37 words
A liquid adhesive composition as defined in claim 1 in which said polyester polyol is a saturated, branched polyester polyol formed from mixed aliphatic and aromatic dicarboxylic acids, at least one diol and at least one triol.
Claim 4
Dependent Claim
52 words
A liquid adhesive composition as defined in claim 2 in which said first part includes a triol to the extent of from about 1% to about 10% by weight based on the weight of said polyol and a catalyst for the reaction between the isocyanate and active hydrogens of the -OH functionality.
Claim 5
Dependent Claim
103 words
A liquid adhesive composition as defined in claim 3 in which said polyester polyol of the first part has an equivalent weight of from about 200 to about 300 and is formed by reaction of mixed acids including phthalic and at least one aliphatic acid from the group consistinG of adipic acid, succinic acid and glutaric acid, at least one diol from the group consisting of propylene glycol, diethylene glycol, 2 ethyl, 1,3 hexane diol, and triethylene glycol and at least one triol from the group consisting of 1,2,6 hexane triol, 1,1,1 trimethylol ethane, pentaerythritol, tris (2 hydroxy ethyl) isocyanurate and trimethylol propane.
Claim 6
Dependent Claim
85 words
A liquid adhesive composition as defined in claim 4 in which said prepolymer is the reaction product of a polyester polyol as defined in claim 4 and an organic polyisocyanate from the group consisting of carbodiimide of 4,4'' diphenyl methane diisocyanate containing additional 4,4'' diphenyl methane diisocyanate to give a liquid product, polymethylene polyphenylene isocyanate and a normally liquid 4,4'' diphenyl methane diisocyanate containing higher functionality dimers and trimers, said prepolymer having from about 18% to about 22% isocyanate groups by weight of the prepolymer.
References Cited (Backward Citations)
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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 |