Patent US4087727A successfully refreshed from Google Patents.
US4234445A
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US
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Polyurethane spray composition containing lactone viscosity modifier
Assignee: Uniroyal Chemical Co Inc
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Filing: 1979-01-25
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Granted: 1980-11-18
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Expires: 1999-01-25
Abstract
Abstract A method for preparing polyurethane by spraying a mixture of (a) polyurethane prepolymer, and (b) curative which gives a tack-free time of 15 seconds to 5 minutes, wherein (a) and/or (b) contain a lactone as viscosity modifier.
Inventors
- 👤 Edward L. Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A composition comprising a mixture of: (b) curative for a polyurethane prepolymer which gives a tack-free time of 15 seconds to 5 minutes; and (c) a lactone having the formula: ##STR2## wherein R represents an alkylene radical having from 4 to 6 carbon atoms, the curative (b) being dissolved in the lactone (c) and the ratio of curative (b) to lactone (c) being from 1:10 to 100:1, by weight.
Claim 2
Dependent Claim
69 words
A composition comprising a mixture of: (b) curative for a polyurethane prepolymer which gives a tack-free time of 15 seconds to 5 minutes; and (c) a lactone having the formula: ##STR2## wherein R represents an alkylene radical having from 4 to 6 carbon atoms, the curative (b) being dissolved in the lactone (c) and the ratio of curative (b) to lactone (c) being from 1:10 to 100:1, by weight.
Claim 3
Dependent Claim
104 words
A composition comprising a mixture of: (b) curative for a polyurethane prepolymer which gives a tack-free time of 15 seconds to 5 minutes and which is at least one substance selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, thiodiethanol, methylene-dianiline, trimethylene glycol di-p-aminobenzoate, bis(o-aminophenylthio) ethane, 4,4'-methylenebis(dimethyl anthranilate), ethylenediamine, and hexamethylene-diamine; and (c) a lactone having the formula: ##STR3## wherein R represents an alkylene radical having from 4 to 6 carbon atoms, the curative (b) being dissolved in the lactone (c) and the ratio of curative (b) to lactone (c) being from 1:10 to 100:1, by weight.
Claim 4
Dependent Claim
104 words
A composition comprising a mixture of: (b) curative for a polyurethane prepolymer which gives a tack-free time of 15 seconds to 5 minutes and which is at least one substance selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, thiodiethanol, methylene-dianiline, trimethylene glycol di-p-aminobenzoate, bis(o-aminophenylthio) ethane, 4,4'-methylenebis(dimethyl anthranilate), ethylenediamine, and hexamethylene-diamine; and (c) a lactone having the formula: ##STR3## wherein R represents an alkylene radical having from 4 to 6 carbon atoms, the curative (b) being dissolved in the lactone (c) and the ratio of curative (b) to lactone (c) being from 1:10 to 100:1, by weight.
Claim 5
Dependent Claim
14 words
A composition as in claim 2 in which the curative (b) is methylene dianiline.
Claim 6
Dependent Claim
13 words
A composition as in claim 2 in which the lactone (c) is gamma-butyrolactone.
References Cited (Backward Citations)
US3075998A
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US2598803A
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US3440086A
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US3553175A
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US3679636A
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US3931115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |