US4267299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of curing isocyanate-terminated polyurethane prepolymers for use in solventless spray applications
Assignee: METALWELD Inc A CORP OF PA
•
Filing: 1979-06-29
•
Granted: 1981-05-12
•
Expires: 1999-06-29
Abstract
Abstract Solventless compositions for preparing sprayable polyurethanes and poly(urea)urethanes by spraying a mixture of: (a) An isocyanate-terminated prepolymer or quasi-prepolymer; and (b) A curing agent comprising a relatively highly reactive polyol or polyamine or combination thereof and at least about 20% by weight of a reactive "filler" comprising a polyol having an equivalent weight in the range from about 300 to about 2,000.
Inventors
- 👤 Sixtus J. Oechsle, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/0895; C08G2150/00; C08G2150/50
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
162 words
A method for the solventless spray application of a polyurethane or poly(urea)urethane coating, comprising the steps of: (a) Delivering to a mixing chamber an isocyanate-terminated polyurethane prepolymer or quasi-prepolymer; (b) Delivering to said mixing chamber a curing agent comprising from about 10% to about 80% by weight of one or more relatively highly reactive polyols and/or polyamines in an amount sufficient almost completely to cure the prepolymer or quasi-prepolymer and from about 90% to about 20% by weight of a reactive polyol filler having an equivalent weight in the range from about 300 to about 2,000; (c) If necessary to effect fluid transfer and intimate admixing, heating said polymer and/or quasi-prepolymer and/or said curing agent to a temperature in the range from about 160° F. to about 200° F.; (d) Intimately admixing said prepolymer or quasi-prepolymer and said curing agent; and (e) Immediately after admixing, spraying said admixture through an atomizing nozzle onto a surface to produce a polyrethane or poly(urea)urethane coating.
Claim 2
Independent Claim
162 words
A method for the solventless spray application of a polyurethane or poly(urea)urethane coating, comprising the steps of: (a) Delivering to a mixing chamber an isocyanate-terminated polyurethane prepolymer or quasi-prepolymer; (b) Delivering to said mixing chamber a curing agent comprising from about 10% to about 80% by weight of one or more relatively highly reactive polyols and/or polyamines in an amount sufficient almost completely to cure the prepolymer or quasi-prepolymer and from about 90% to about 20% by weight of a reactive polyol filler having an equivalent weight in the range from about 300 to about 2,000; (c) If necessary to effect fluid transfer and intimate admixing, heating said polymer and/or quasi-prepolymer and/or said curing agent to a temperature in the range from about 160° F. to about 200° F.; (d) Intimately admixing said prepolymer or quasi-prepolymer and said curing agent; and (e) Immediately after admixing, spraying said admixture through an atomizing nozzle onto a surface to produce a polyrethane or poly(urea)urethane coating.
Claim 3
Dependent Claim
30 words
A method as set forth in claim 1, in which the filler is a polytetramethylene ether glycol having an equivalent weight in the range from about 300 to about 1,000.
Claim 4
Dependent Claim
33 words
A method as set forth in claim 1, wherein said filler includes one or more pigments dispersed in a polyol having an equivalent weight in the range from about 300 to about 1,000.
Claim 5
Dependent Claim
35 words
A method as set forth in claim 1, wherein said prepolymer and said curing agent include up to about 50% by weight of silica particles having a particle size of not more than ten microns.
Claim 6
Dependent Claim
34 words
A method as set forth in claim 1, wherein said isocyanate-terminated prepolymer is formed from the reaction of toluene diisocyanate and a polyether glycol and the highly reactive polyol and/or polyamine comprises menthane diamine.
Claim 7
Dependent Claim
51 words
A method as set forth in claim 1, wherein said prepolymer is formed by the reaction of toluene diisocyanate and a polyether glycol and said curing agent comprises crystalline methylene dianaline, gamma butyro lactone and a polyether glycol having an equivalent weight in the range from about 300 to about 1,000.
Claim 8
Dependent Claim
32 words
A method as set forth in claim 1, wherein said isocyanate-terminated prepolymer is formed from the reaction of hydroxyl terminated polybutadiene and diphenylmethane-4,4' diisocyanate and said relatively highly reactive compound is polybutadiene.
Claim 9
Dependent Claim
38 words
A method as set forth in claim 1, wherein said relatively highly reactive compound is methylene dianiline, which comprises about 33.3% by weight of the curing agent and a polyether glycol having an equivalent weight of about 500.
Claim 10
Dependent Claim
33 words
A method as set forth in claim 6, wherein said curing agent includes a pigment dispersed in a polyether glycol having an equivalent weight in the range from about 300 to about 1,000.
Claim 11
Dependent Claim
32 words
A method as set forth in claim 1, wherein the gel time of the reaction between the curing agent and the prepolymer or quasi-prepolymer is from about two to about five minutes.
Claim 12
Dependent Claim
51 words
A method as set forth in claim 1, wherein the prepolymer is a polyether based prepolymer of diphenylmethane 4,4'-diisocyanate, said curing compound is 1,4-butane diol and said filler is a polytetramethylene ether glycol having a molecular weight of about 1,000, the volume ratio of prepolymer to curing agent being about 3:1.
Claim 13
Dependent Claim
28 words
A method as set forth in claim 1, wherein said highly reactive polyols and/or polyamines comprise from about 10% to about 60% by weight of the curing agent.
Claim 14
Dependent Claim
19 words
A method as set forth in claim 1, wherein said curing agent includes dimethyl phthalate as a non-reactive filler.
Claim 15
Dependent Claim
15 words
A method as set forth in claim 1, wherein the curing agent comprises methylene bis(2,6-diisopropylaniline).
Claim 16
Dependent Claim
30 words
A method as set forth in claim 1, wherein the prepolymer is a reaction product of hexamethylene diisocyanate with a polytetramethylene ether glycol having a molecular weight of about 1,000.
Claim 17
Dependent Claim
16 words
A method as set forth in claim 1, wherein the curing agent comprises diethylated toluene diamine.
Claim 18
Dependent Claim
43 words
A method as set forth in claim 1, wherein the volume ratio of the compositions set forth in step (a) to the compositions set forth in step (b) is in the range from about 1:1 to about 4:1 and is a whole integer.
Claim 19
Dependent Claim
24 words
A method as set forth in claim 1, wherein said polyol has an equivalent weight in the range from about 500 to about 1,000.
Claim 20
Dependent Claim
20 words
A method as set forth in claim 14, wherein said reactive polyol filler has an equivalent weight of about 1,000.
Claim 21
Dependent Claim
13 words
The product of any of the methods set forth in claims 1-19 inclusive.
References Cited (Backward Citations)
US2929800A
Cited
US3427366A
Cited
US3471445A
Cited
US3718624A
Cited
US3725355A
Cited
US3892713A
Cited
US3897401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |