Patent US4404320A successfully refreshed from Google Patents.
US4404320A
Expired / Lapsed
US
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Polyurethane composition for powder coating
Assignee: Mitsui Polychemicals Co Ltd
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Filing: 1981-08-12
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Granted: 1983-09-13
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Expires: 2001-08-12
Abstract
Abstract A polyurethane based composition for powder coating uses, which comprises a combination of an organic polyisocyanate compound and a hydroxyl-containing compound, the hydroxyl-containing compound being (A) A hydroxyl-containing polymer, or its carboxyl-modified product, obtained by hydrolyzing a copolymer of a vinyl ester of a saturated monocarboxylic acid and other polymerizable vinyl monomers, and (B) A polyester polyol of softening point of not lower than 40° C. containing not less than 30 weight % of cyclohexylene or cyclohexenylene group or spiro rings. The composition provides coating film exhibiting exceedingly improved hardness, heat resistance, toughness and transparency as compared with the conventional polyolefin based powder coatings.
Inventors
- 👤 Jugo Goto
- 👤 Kazutaka Mochizuki
- 👤 Tsutomu Kubota
- 👤 Reiji Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/4009; C08G18/4063; C08G18/42; C08G18/4205; C08G18/423; C08G18/62; C08G18/6212; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
A polyurethane based powder composition for powder coating uses, consisting essentially of a combination of a completely or partially blocked isocyanate compound or mixtures thereof and a hydroxyl-containing compound, the hydroxyl-containing compound being (A) A hydroxyl-containing polymer, or its carboxyl-modified product, obtained by hydrolyzing a copolymer of a vinyl ester of a saturated monocarboxylic acid and other polymerizable vinyl monomers, and (B) A polyester polyol of a softening point not lower than 40° C., containing not less than 30 weight % of cyclohexylene, cyclohexenylene groups or spiro rings.
Claim 2
Dependent Claim
88 words
A polyurethane based powder composition for powder coating uses, consisting essentially of a combination of a completely or partially blocked isocyanate compound or mixtures thereof and a hydroxyl-containing compound, the hydroxyl-containing compound being (A) A hydroxyl-containing polymer, or its carboxyl-modified product, obtained by hydrolyzing a copolymer of a vinyl ester of a saturated monocarboxylic acid and other polymerizable vinyl monomers, and (B) A polyester polyol of a softening point not lower than 40° C., containing not less than 30 weight % of cyclohexylene, cyclohexenylene groups or spiro rings.
Claim 3
Dependent Claim
42 words
A composition as claimed in claim 1, wherein the partially blocked isocyanate is reacted in advance with the component (B) and the reaction product of the partially blocked isocyanate compound and the component (B) is used in combination with the component (A).
Claim 4
Dependent Claim
25 words
A composition as claimed in claim 1, wherein and the partially blocked isocyanate compound is reacted with a mixture of the components (A) and (B).
Claim 5
Dependent Claim
52 words
A composition as claimed in claim 1, wherein a product obtained by reacting the component (B) with excess of the isocyanate compound to produce an adduct having free isocyanate groups at its terminals, followed by blocking the free isocyanate groups with a blocking agent, is used in combination with the component (A).
Claim 6
Dependent Claim
32 words
A composition as claimed in claim 1, wherein the copolymer of a vinyl ester of a saturated carboxylic acid and other polymerizable vinyl monomers is a copolymer of vinyl acetate and ethylene.
Claim 7
Dependent Claim
25 words
A composition as claimed in claim 1, wherein the hydroxyl number of the polyester polyol is in the range of about 5 to 300 mgKOH/g.
Claim 8
Dependent Claim
61 words
A composition as claimed in claim 1, wherein the mixing ratio of the hydroxyl-containing compound relative to the completely blocked isocyanate compound is in the range of about 30 to 1000 parts by weight of the component (A) and about 30 to 1000 parts by weight of the component (B) against 100 parts by weight of the completely blocked isocyanate compound.
Claim 9
Dependent Claim
23 words
A composition as claimed in claim 1, wherein the completely blocked isocyanate compound is a completely blocked product of 1,3-xylylene diisocyanate with ε-caprolactam.
Claim 10
Dependent Claim
55 words
A composition as claimed in claim 2, wherein the mixing ratio of the component (A) relative to the reaction product of the partially blocked isocyanate compound and the component (B) is in the range of about 5 to 2000 parts by weight of the component (A) against 100 parts by weight of the reaction product.
Claim 11
Dependent Claim
64 words
A composition as claimed in claim 2, wherein the partially blocked isocyanate compound is one obtained by the reaction of 1,3-bis(isocyanatomethyl)cyclohexane and ε-caprolactam, the component (B) is a polyester polyol obtained by the reaction of methylhexahydrophthalic acid, hydrogenated bisphenol A and trimethylolpropane and the component (A) is a carboxyl-modified product obtained by grafting acrylic acid onto a hydrolyzed product of an ethylene/vinyl acetate copolymer.
Claim 12
Dependent Claim
49 words
A composition as claimed in claim 4, wherein the mixing ratio of the adduct having free isocyanate groups blocked with a blocking agent relative to the component (A) is in the range of about 10 to 2000 parts by weight against 100 parts by weight of the blocked adduct.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |