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US4495229A
Expired / Lapsed
US
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One-component, heat-curing polyurethane-coatings, stable in storage
Assignee: Huels AG
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Filing: 1983-05-31
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Granted: 1985-01-22
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Expires: 2003-05-31
Abstract
Abstract A polyurethane one-component heat-curing coating which is stable in storage and is hardened above a temperature of about 120° C., comprising a polyol compound having a low glass transition temperature, and a blocked polyisocyanate compound, wherein the blocked polyisocyanate compound is the reaction product of a polyisocyanate compound and a secondary amine compound having the formula: ##STR1## wherein R is selected from the group consisting of hydrogen atom, C 3 -C 9 alkyl radical, unsubstituted cycloalkyl radical, cycloalkyl radical substituted by C 1 -C 4 alkyl radicals, or heteroatom-containing cycloalkyl radical, wherein each R is identical to or different from each other; R 1 is selected from the group consisting of alkyl radical, or cycloalkyl radical, wherein each R 1 is identical to or different from each other; or R and R 1 are chemically bonded therebetween, thereby forming a ring structure.
Inventors
- 👤 Elmar Wolf
- 👤 Felix Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:36
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/02; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4219; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C08G18/808
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
A polyurethane one-component heat-curing coating which is stable in storage and is hardened above a temperature of about 120° C., comprising a polyol compound having a low glass transition temperature, and a blocked polyisocyanate compound, wherein said blocked polyisocyanate compound is the reaction product of a polyisocyanate compound and a sterically hindered secondary amine compound having the formula: ##STR4## wherein R is selected from the group consisting of a hydrogen atom, C 3 -C 9 alkyl radical, unsubstituted cycloalkyl radical, cycloalkyl radical substituted by C 1 -C 4 alkyl radicals, or heteroatom-containing cycloalkyl radical, wherein each R is identical to or different from each other; R 1 is selected from the group consisting of alkyl radical or cycloalkyl radical, wherein each R 1 is identical to or different from each other; or R and R 1 are chemically bonded therebetween, thereby forming a ring structure.
Claim 2
Dependent Claim
145 words
A polyurethane one-component heat-curing coating which is stable in storage and is hardened above a temperature of about 120° C., comprising a polyol compound having a low glass transition temperature, and a blocked polyisocyanate compound, wherein said blocked polyisocyanate compound is the reaction product of a polyisocyanate compound and a sterically hindered secondary amine compound having the formula: ##STR4## wherein R is selected from the group consisting of a hydrogen atom, C 3 -C 9 alkyl radical, unsubstituted cycloalkyl radical, cycloalkyl radical substituted by C 1 -C 4 alkyl radicals, or heteroatom-containing cycloalkyl radical, wherein each R is identical to or different from each other; R 1 is selected from the group consisting of alkyl radical or cycloalkyl radical, wherein each R 1 is identical to or different from each other; or R and R 1 are chemically bonded therebetween, thereby forming a ring structure.
Claim 3
Dependent Claim
20 words
The polyurethane one-component heat-curing coating of claim 1, wherein said polyisocyanate compound is a monomeric, dimeric or trimeric polyisocyanate compound.
Claim 4
Dependent Claim
17 words
The polyurethane one-component heat-curing coating of claim 1, wherein said polyisocyanate compound is a chain-extending polyisocyanate compound.
Claim 5
Dependent Claim
30 words
The polyurethane one-component heat-curing coating of claim 2, wherein said monomeric polyisocyanate is selected from the group consisting of aliphatic, cycloaliphatic, araliphatic, aryl-substituted aliphatic and aromatic diisocyanates and aromatic triisocyanates.
Claim 6
Dependent Claim
14 words
The polyurethane one-component heat-curing coating of claim 4, wherein said monomeric polyisocyanate is 3-isocyanato-methyl-3,5,5-trimethylcyclohexylisocyanate.
Claim 7
Dependent Claim
19 words
The polyurethane one-component heat-curing coating of claim 4, wherein said monomeric polyisocyanate is toluene diisocyanate and isomer mixtures thereof.
Claim 8
Dependent Claim
34 words
The polyurethane one-component heat-curing coating of claim 1, wherein said secondary amine compound is selected from the group consisting of diisopropylamine, isopropyl-tert-butylamine, dicyclohexylamine, di-(3,5,5-trimethylcyclohexyl)amine, 2,6-dimethylpiperidine, 2,5-dimethylpyrrolidine, 2,2,6,6-tetramethylpiperidine, 2,2,4,6-tetramethylpiperidine, and isopropylcyclohexylamine or a mixture thereof.
Claim 9
Dependent Claim
24 words
The polyurethane one-component heat-curing coating of claim 1, wherein said polyol compound is selected from the group of polyesters, polyethers, polyacetals, polyesteramides, and polyepoxides.
Claim 10
Dependent Claim
26 words
The polyurethane one-component heat-curing coating of claim 8, wherein said polyol has 2 to 6 hydroxyl groups and a molecular weight of about 400 to 2000.
Claim 11
Dependent Claim
98 words
The polyurethane one-component heat-curing coating of claim 1, wherein the reaction of said polyisocyanate compound and said secondary amine compound is effected by mixing said polyisocyanate compound with a high-boiling inert organic solvent, heating the mixture of said polyisocyanate compound and said organic solvent to a temperature of about 70° to 120° C., adding said secondary amine compound to the heated mixture such that the temperature of the reaction mixture does not exceed about 130° C., and heating said reaction mixture at about 100° to 120° C. for a period of about an hour, thereby completing said reaction.
Claim 12
Dependent Claim
46 words
The polyurethane one-component heat-curing coating of claim 1, wherein the reaction product of said polyisocyanate compound and said secondary amine comprises a compound having a molecular weight in the range of 300 to 2500 with a melting temperature in the range of 30° to 220° C.
Claim 13
Dependent Claim
66 words
A method of producing a high quality object made of metal, glass or plastic which comprises applying the polyurethane one-component heat-curing coating of claim 1 to a surface of said object, and heating said object coated with said coating above a temperature of about 120° C. for a period of about 30 minutes to 30 seconds, thereby hardening said coating on the surface of said object.
References Cited (Backward Citations)
US3115479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |