US4649067A
Expired / Lapsed
US
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One-component baking enamels
Assignee: Huels AG
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Filing: 1984-05-24
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Granted: 1987-03-10
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Expires: 2004-05-24
Abstract
Abstract One-component baking enamels of polyesters, containing hydroxyl groups, and polyisocyanates, wherein the polyisocyanate component consists of 2-methyl-1,5-diisocyanatopentane (MPDI) having the formula (I): ##STR1## which is blocked totally or partially by ε-caprolactam or acetoxime, or a mixture of the same with 2-ethyl-1,4-diisocyanatobutane (EBDI) having the formula (II): ##STR2## which is blocked totally or partially by ε-caprolactam or acetoxime, wherein the diisocyanate mixture of (I) and (II) has about 88 to 99% by weight of (I) and about 12 to 1% by weight of (II) and the free isocyanate (NCO) content is up to about 10% by weight. The one-component baking enamels are suitable for application to metal, glass and plastic objects and exhibit excellent flexibility and weather resistance.
Inventors
- 👤 Rainer Gras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:41
CPC Classifications
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; C08G18/73; C08G18/80; C08G18/8061; C08G18/807
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
One-component baking enamels comprising polyesters, containing hydroxyl groups, and polyisocyanates, wherein the polyisocyanate component consists of 2-methyl-1,5-diisocyanatopentane (MPDI) having the formula (I): ##STR5## which is blocked totally or partially by ε-caprolactam or acetoxime, or a mixture of the same with 2-ethyl-1,4-diisocyanatobutane (EBDI) having the formula (II): ##STR6## which is blocked totally or partially by ε-caprolactam or acetoxime, wherein the diisocyanate mixture of (I) and (II) has about 88 to 99% by weight of (I) and about 12 to 1% by weight of (II) and the free isocyanate (NCO) content is up to about 10% by weight; and a solvent having a lower limit of the boiling point of around 100° C.
Claim 2
Dependent Claim
111 words
One-component baking enamels comprising polyesters, containing hydroxyl groups, and polyisocyanates, wherein the polyisocyanate component consists of 2-methyl-1,5-diisocyanatopentane (MPDI) having the formula (I): ##STR5## which is blocked totally or partially by ε-caprolactam or acetoxime, or a mixture of the same with 2-ethyl-1,4-diisocyanatobutane (EBDI) having the formula (II): ##STR6## which is blocked totally or partially by ε-caprolactam or acetoxime, wherein the diisocyanate mixture of (I) and (II) has about 88 to 99% by weight of (I) and about 12 to 1% by weight of (II) and the free isocyanate (NCO) content is up to about 10% by weight; and a solvent having a lower limit of the boiling point of around 100° C.
Claim 3
Dependent Claim
24 words
The one-component baking enamels of claim 1, wherein said diisocyanate mixture has a free isocyanate (NCO) content of up to about 5% by weight.
Claim 4
Dependent Claim
43 words
The one-component baking enamels of claim 1, wherein the mixture consists of about 50 to 90% by weight of the polyester containing hydroxyl groups and about 50 to 10% by weight of a totally or partially blocked MPDI or MPDI and EBDI mixture.
Claim 5
Dependent Claim
22 words
The one-component baking enamels of claim 3, wherein the hydroxyl (OH)/isocyanate (NCO) ratio is in the range of 1:0.8 to 1:1.2, respectively.
Claim 6
Dependent Claim
22 words
The one-component baking enamels of claim 4, wherein the hydroxy (OH)/isocyanate (NCO) ratio is in the range of 1:0.95 to 1:1.1, respectively.
Claim 7
Dependent Claim
26 words
The one-component baking enamels of claim 1, wherein said polyesters containing hydroxyl groups comprise diols, polyols and aromatic dicarboxylic acids and the esters and anhydrides thereof.
Claim 8
Dependent Claim
31 words
The one-component baking enamels of claim 6, wherein said polyesters containing hydroxyl groups have a low second order transition temperature which is less than 20° C. and greater than -25° C.
Claim 9
Dependent Claim
29 words
The one-component baking enamels of claim 6, wherein said aromatic dicarboxylic acids, esters and anhydrides thereof comprises phthalic, isophthalic, terephthalic and benzene-tricarboxylic acids, trimellitic acid anhydride and dimethyl terephthalate.
Claim 10
Dependent Claim
39 words
The one-component baking enamels of claim 6, wherein said diols comprise ethylene glycol, 1,2-propylene glycol, 1,2- or 1,3- or 1,4-butylene glycol, 3-methyl-1,5-pentanediol, hexamethylene glycol, cyclohexanediol, 4,4'-dihydroxy-2,2-dicyclohexylpropane, 1,4-dihydroxymethylcyclohexane, diethylene glycol, triethylene glycol, hydroxypivalic acid neopentyl glycol ester or neopentyl glycol.
Claim 11
Dependent Claim
16 words
The one-component baking enamels claim 6, wherein said polyols comprise glycerin, hexanetriol, pentaerythritol, trimethylolpropane and trimethylolethane.
Claim 12
Dependent Claim
33 words
The one-component baking enamels of claim 6, wherein said polyesters further comprise the monofunctional carboxylic acid benzoic acid, and the polycarboxylic acids adipic acid, 2,2,4- and 2,4,4-trimethyladipic acid, sebacic acid and dodecanedicarboxylic acid.
Claim 13
Dependent Claim
58 words
The one-component baking enamels of claim 1, wherein said solvent is a hydrocarbon selected from the group of toluene or xylene, an ester selected from the group of butyl acetate, n-hexyl acetate, ethylene glycol acetate or butyl glycol acetate, and a ketone selected from the group of methyl isobutyl ketone, diisobutyl ketone or isophorone or a mixture thereof.
Claim 14
Dependent Claim
27 words
The one-component baking enamels of claim 1, wherein the concentration of the polyester and the polyisocyanate in the solvent is between about 40 and 80% by weight.
Claim 15
Dependent Claim
23 words
The one-component baking enamels of claim 1 which further comprise pigments, fillers, leveling agents, gloss improvers, defoaming agents, wetting agents and stabiliting agents.
Claim 16
Dependent Claim
58 words
A method of imparting weather resistance to a metal, glass or plastic object which comprises applying the one-component baking enamel of claim 1 to the surface of said object, and heating said coated object to a temperature in the range of 120° to 350° C. for a period of 30 minutes to 30 seconds, thereby hardening said enamel.
Claim 17
Dependent Claim
31 words
The method of claim 15, wherein said coated object is heated to a temperature in the range of 140° to 300° C. for a period of 30 munites to 30 seconds.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |