US4246380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdery polyurethane lacquers based on polyester resins and blocked isocyanates
Assignee: Huels AG
•
Filing: 1978-07-31
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Granted: 1981-01-20
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Expires: 1998-07-31
Abstract
Abstract A powdery polyurethane lacquer which comprises (a) a hydroxyl-group containing polyester resin with an OH number of 40-240 and (b) an epsilon -caprolactam-blocked polyisocyanate, selected from the group consisting of triisocyanatoisocyanurate of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate and mixtures of said triisocyanatoisocyanurate with monomeric or oligomeric 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate; wherein the epsilon -caprolactam-blocked triisocyanatoisocyanurate has at least two blocked isocyanate groups and wherein the epsilon -caprolactam-polyisocyanate is present in an amount sufficient to cause hardening of said mixture of (a) and (b). The lacquer is especially useful for electrostatic coating of substrates.
Inventors
- 👤 Rainer Gras
- 👤 Felix Schmitt
- 👤 Elmar Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/80; C08G18/8061; C08G18/807; C08G18/8074; C08G2150/00; C08G2150/20; Y; Y10; Y10S; Y10S528/00; Y10S528/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A powdery polyurethane lacquer which comprises: (A) a hydroxy-group containing polyester resin with an OH number of 40-240 and; (B) an ε-caprolactam-blocked polyisocyanate which is a mixture of the triisocyanatoisocyanurate of 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate with monomeric or oligomeric 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate; wherein said ε-caprolactam-blocked triisocyanatoisocyanurate has at least two blocked isocyanate groups, and wherein said ε-caprolactam-polyisocyanate is present in an amount sufficient to cause hardening of said mixture of (A) and (B), at temperatures higher than about 150° C.
Claim 2
Dependent Claim
75 words
A powdery polyurethane lacquer which comprises: (A) a hydroxy-group containing polyester resin with an OH number of 40-240 and; (B) an ε-caprolactam-blocked polyisocyanate which is a mixture of the triisocyanatoisocyanurate of 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate with monomeric or oligomeric 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate; wherein said ε-caprolactam-blocked triisocyanatoisocyanurate has at least two blocked isocyanate groups, and wherein said ε-caprolactam-polyisocyanate is present in an amount sufficient to cause hardening of said mixture of (A) and (B), at temperatures higher than about 150° C.
Claim 3
Dependent Claim
16 words
The lacquer of claim 1, wherein the amount of said ε-caprolactam-blocked polyisocyanate is 20-42% by weight.
Claim 4
Dependent Claim
19 words
The powdery lacquer of claim 1, wherein the weight ratio of isocyanaurate to monomeric diisocyanate is 80:20 to 30:70.
Claim 5
Dependent Claim
22 words
The lacquer of claim 1, wherein said hydroxy group-containing polyester resin is prepared from a cyclic polycarboxylic acid, its esters or anhydrides.
Claim 6
Dependent Claim
31 words
The lacquer of claim 4, wherein said polycarboxylic acid ester or anhydride is selected from the group consisting of phthalic acid, isophthalic acid, benzene-1,3,5-tricarboxylic acid, trimellitic acid anhydride, and dimethyl terephthalate.
Claim 7
Dependent Claim
19 words
The lacquer of claim 1, wherein said hydroxy group-containing polyester resin is prepared from a diol or a polyol.
Claim 8
Dependent Claim
29 words
The lacquer of claim 6, wherein said diol is selected from the group consisting of glycol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2,2-dimethyl propanediol, hexanediol-1,6, 4,4'-dihydroxydicyclohexlpropane-2,2,-cyclohexanediol, diethylene glycol and bis-ethyloxated-4,4'-dihydroxydiphenyl-2,2-propane, and 1,4-dihydroxymethylcyclohexane.
Claim 9
Dependent Claim
21 words
The lacquer of claim 6, wherein said polyol is selected from the group consisting of glycerine, hexanetriol, pentearythrol, trimethylolpropane and trimethylolethane.
Claim 10
Dependent Claim
24 words
The powdery lacquer of claim 1, wherein said lacquer is in the form of a free flowing powder with a particle size of 20-120μ.
Claim 11
Dependent Claim
16 words
The powdery lacquer of claim 1, wherein the OH number of said polyester is between 40-150.
References Cited (Backward Citations)
US3819586A
Cited
US3922253A
Cited
US3893977A
Cited
US4018744A
Cited
US3931117A
Cited
US3993849A
Cited
US3998768A
Cited
US4028309A
Cited
US4150211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |