US4247666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating comprising blocked isocyanate
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1979-05-29
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Granted: 1981-01-27
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Expires: 1999-05-29
Abstract
Abstract Substantially pure crystals of ε-caprolactam-diblocked ω,ω'-diisocyanato-1,3-dimethylbenzene melting at 110° C. or higher are advantageously used as a hardener of powder coating composition.
Inventors
- 👤 Kazutaka Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7628; C08G18/7642; C08G18/80; C08G18/8061; C08G18/807; C08G18/8074; C09; C09D; C09D175/00; C09D175/04; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
A blocked isocyanate powder coating composition which contains, as a predominant component, substantially pure crystals of ε-caprolactam-diblocked ω,ω'-diisocyanato-1,3-dimethylbenzene, said crystals melting at 110° C. or higher.
Claim 2
Dependent Claim
26 words
A blocked isocyanate powder coating composition which contains, as a predominant component, substantially pure crystals of ε-caprolactam-diblocked ω,ω'-diisocyanato-1,3-dimethylbenzene, said crystals melting at 110° C. or higher.
Claim 3
Dependent Claim
46 words
A blocked isocyanate powder coating composition as claimed in claim 1, wherein the composition comprises not less than 70 weight % of substantially pure crystals of ε-caprolactam-diblocked ω,ω'-diisocyanato-1,3-dimethylbenzene, melting at 110° c. or higher and not more than 30 weight % of crystals of ε-caprolactam-diblocked ω,ω'-diisocyanato-1,4-dimethylbenzene.
Claim 4
Dependent Claim
45 words
In a powder coating composition comprising a blocked polyisocyanate and a polyol resin having a melting point not less than 40° C., the improvement which comprises using as a blocked polyisocyanate substantially pure crystals of ε-caprolactamdiblocked ω,ω'-diisocyanato-1,3-dimethylbenzene, said crystals melting at 110° C. or higher.
Claim 5
Dependent Claim
45 words
In a powder coating composition comprising a blocked polyisocyanate and a polyol resin having a melting point not less than 40° C., the improvement which comprises using as a blocked polyisocyanate substantially pure crystals of ε-caprolactamdiblocked ω,ω'-diisocyanato-1,3-dimethylbenzene, said crystals melting at 110° C. or higher.
Claim 6
Dependent Claim
20 words
A powder coating composition as claimed in claim 3, wherein the polyol resin is a hydrolyzed ethylene vinyl ester copolymer.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |