US3919352A
Expired / Lapsed
US
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Powder coating compositions
Assignee: Kansai Paint Co Ltd
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Filing: 1973-05-29
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Granted: 1975-11-11
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Expires: 1993-05-29
Abstract
Abstract Powder coating composition comprising 4 to 20 percent by weight of a hexamethylolmelamine derivative and 96 to 80 percent by weight of an acrylic resin having a softening point of 65* to 130*C and an acid value of 5 to 20 and containing 0.4 to 2.0 mols of free hydroxyl group per kilogram of the resin, said hexamethylolmelamine derivative being at least one of etherified products of hexamethylolmelamine which have CH3O- and RO- groups substituted for the hydroxyl group in the methylol group of hexamethylolmelamine, the average total number of the CH3O- and RO- groups being 5.5 to 6.0 per melamine nucleus, the average number of the RO- group being 0.5 to 3.0 per melamine nucleus, wherein RO is group, R'' being an alkyl group having 1 to 4 carbon atoms and R'''' being hydrogen atom or methyl group.
Inventors
- 👤 Maozumi Iwasawa
- 👤 Minoru Shibata
- 👤 Tadashi Watanabe
- 👤 Ichiro Yoshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:36
CPC Classifications
C; C09; C09D; C09D133/00; Y; Y10; Y10S; Y10S525/00; Y10S525/934; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31862
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A COATING COMPOSITION COMPRISING 4 TO 20 PERCENT BY WEIGHT OF A HEXAMETHYLOLMELAMINE DERIVATIVE AND 96 TO 80 PERCENT BY WEIGHT OF AN ACRYLIC RESIN, SAID COMPOSITION BEING IN THE FORM OF POWDER HAVING A SOFTENING POINT OF 65 TO 130*C AND AN ACID VALUE OF 5 TO 20 AND CONTAINING 0.4 TO 2.0 MOLS OF FREE HYDROXYL GROUP PER KILOGRAM OF THE RESI, SAID HEXAMETHYLOLAMINE DERIVATIVE BEING AT LEAT ONE OF ETHERIFIED PRODUCT OF HEXAMETHYLOLAMINE WHICH HAVE CH2OAND RO- GROUPS SUBSTITUTED FOR THE HYDOXYL GROUP IN THE METHYLOL GROUP OF HEXAMETHYLOLMELAMINE, THE AVERAGE TOTAL NUMBER OF THE CH2O- AND RO- GROUPS BEING 5.5 TO 6.0 PER MELAMINE NUCLEUS, THE AVERAGE NUMBER OF THE RO- GROUP BEING 0.5 TO 3.0 PER MELAMINE NUCLEUS, WHEREIN
Claim 2
Dependent Claim
124 words
A COATING COMPOSITION COMPRISING 4 TO 20 PERCENT BY WEIGHT OF A HEXAMETHYLOLMELAMINE DERIVATIVE AND 96 TO 80 PERCENT BY WEIGHT OF AN ACRYLIC RESIN, SAID COMPOSITION BEING IN THE FORM OF POWDER HAVING A SOFTENING POINT OF 65 TO 130*C AND AN ACID VALUE OF 5 TO 20 AND CONTAINING 0.4 TO 2.0 MOLS OF FREE HYDROXYL GROUP PER KILOGRAM OF THE RESI, SAID HEXAMETHYLOLAMINE DERIVATIVE BEING AT LEAT ONE OF ETHERIFIED PRODUCT OF HEXAMETHYLOLAMINE WHICH HAVE CH2OAND RO- GROUPS SUBSTITUTED FOR THE HYDOXYL GROUP IN THE METHYLOL GROUP OF HEXAMETHYLOLMELAMINE, THE AVERAGE TOTAL NUMBER OF THE CH2O- AND RO- GROUPS BEING 5.5 TO 6.0 PER MELAMINE NUCLEUS, THE AVERAGE NUMBER OF THE RO- GROUP BEING 0.5 TO 3.0 PER MELAMINE NUCLEUS, WHEREIN
Claim 3
Dependent Claim
14 words
The powder coating composition according to claim 1, in which said RO- group is
Claim 4
Dependent Claim
11 words
The powder coating composition according to claim 2, in which said
Claim 5
Dependent Claim
16 words
The powder coating composition according to claim 3, in which said R''OCH2CH2O- group is CH3OCH2CH2O- group.
Claim 6
Dependent Claim
14 words
The powder coating composition according to claim 1, in which said RO- group is
Claim 7
Dependent Claim
24 words
The powder coating composition according to claim 1, in which said average number of the RO- group is 1.0 to 3.0 per melamine nucleus.
Claim 8
Dependent Claim
44 words
The powder coating composition according to claim 1, in which said acrylic resin has a softening point of 70* to 115*C and an acid value of 7 to 19, and contains 0.4 to 2.0 mols of free hydroxyl group per kilogram of the resin.
Claim 9
Dependent Claim
34 words
The powder coating composition according to claim 1, in which said composition comprises 5 to 15 percent by weight of the hexamethylolmelamine derivative and 95 to 85 percent by weight of the acrylic resin.
Claim 10
Dependent Claim
16 words
The powder coating composition according to claim 1, in which said composition Further contains a pigment.
Claim 11
Dependent Claim
16 words
An article coated with a coating film obtained from the powder coating composition in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |