US4017456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions comprising stabilized reaction product of hydroxyl-terminated urethane and melamine resin
Assignee: Wyeth Holdings LLC
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Filing: 1975-03-20
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Granted: 1977-04-12
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Expires: 1995-03-20
Abstract
Abstract Compositions of matter consisting of (A) urethane prepolymers having terminal hydroxy groups produced from (1) a polyol of 200-3,000 molecular weight, (2) an organic polyisocyanate and (3) a polyhydric alcohol which are admixed with (B) a polyalkylether of a polymethylol and (C) an acid catalyst are rendered more adherent to polymeric substrates by incorporating therein various ultraviolet light absorbers.
Inventors
- 👤 Robert Jerome Tucker
- 👤 Ruth Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:33
CPC Classifications
C; C09; C09D; C09D175/00; C09D175/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/3154; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31935; Y10T428/31938; Y10T428/31942
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A coating composition consisting essentially of a mixture of (1), (2), (3) and (4), in which 1. is a saturated urethane prepolymer having terminal hydroxy groups which is the reaction product of materials consisting essentially of a mixture of (a) and (b), at a molar ratio of 1:2, respectively, in which a. is an isocyanate-terminated urethane which is the reaction product of a mixture of (I) and (II), at a molar ratio of 1:2, respectively, in which I. is a saturated diol having a molecular weight of from about 200 to about 3000 and Ii. is a saturated organic diisocyanate and b. is a monomeric, sterically bulky, polyhydric alcohol containing 2-6 hydroxyl groups and being free of oxyalkylene units, 2.
Claim 2
Dependent Claim
120 words
A coating composition consisting essentially of a mixture of (1), (2), (3) and (4), in which 1. is a saturated urethane prepolymer having terminal hydroxy groups which is the reaction product of materials consisting essentially of a mixture of (a) and (b), at a molar ratio of 1:2, respectively, in which a. is an isocyanate-terminated urethane which is the reaction product of a mixture of (I) and (II), at a molar ratio of 1:2, respectively, in which I. is a saturated diol having a molecular weight of from about 200 to about 3000 and Ii. is a saturated organic diisocyanate and b. is a monomeric, sterically bulky, polyhydric alcohol containing 2-6 hydroxyl groups and being free of oxyalkylene units, 2.
Claim 3
Dependent Claim
24 words
is a polyalkyl ether of a polymethylol melamine, 3. is an acid catalyst and 4. is an ultraviolet light absorber comprising 2-[(2-hydroxy-5-t-octylphenol)] benzotriazole or
Claim 4
Dependent Claim
24 words
is a polyalkyl ether of a polymethylol melamine, 3. is an acid catalyst and 4. is an ultraviolet light absorber comprising 2-[(2-hydroxy-5-t-octylphenol)] benzotriazole or
Claim 5
Dependent Claim
15 words
2,2'-dihydroxy-4-methoxybenzophenone. 2. A composition according to claim 1 wherein said (I) is a polytetramethyleneether glycol.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein said (II) is methylene bis(cyclohexane isocyanate).
Claim 7
Dependent Claim
12 words
A composition according to claim 1 wherein said (b) is 1,4-cyclohexane dimethanol.
Claim 8
Dependent Claim
12 words
A composition according to claim 1 wherein said (2) is hexakismethoxymethyl melamine.
Claim 9
Dependent Claim
125 words
A process for the sequential production of the composition of claim 1 which consists of 1. first reacting a. a one-molar proportion of a saturated diol having a molecular weight of from about 200 to about 3,000 with b. about a two-molar proportion of a saturated organic diisocyanate to produce an isocyanate-terminated urethane prepolymer, 2. then reacting c. a one-molar proportion of said urethane prepolymer with d. about a two-molar proportion of a monomeric, sterically bulky, polyhydric alcohol containing 2-6 hydroxyl groups and being free of oxyalkylene groups, to produce a prepolymer having terminal hydroxy groups and 3. admixing said prepolymer with e. a polyalkyl ether of a polymethylol melamine, f. an acid catalyst and g. an ultraviolet light absorber comprising 2-[(2-hydroxy-5-t-octylphenyl] benzotriazole or 2,2'-dihydroxy-4-methoxybenzophenone.
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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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |