US4904751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N,N'-dialkyl substituted polyoxyalklene amines as curing agents for blocked isocyanates
Assignee: Huntsman Corp
•
Filing: 1987-12-21
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Granted: 1990-02-27
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Expires: 2007-12-21
Abstract
Abstract A polyurethane coating composition is disclosed which may be heat cured under relatively mild conditions. The composition comprises a chemically blocked isocyanate and a curing agent comprising an N,N'-dialkyl substituted polyoxyalkylene amine.
Inventors
- 👤 George P. Speranza
- 👤 Jiang-Jen Lin
- 👤 Michael Cuscurida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3228; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A heat curable polyurethane coating comprising a blocked isocyanate and a curing agent comprising an N,N'-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
Claim 2
Dependent Claim
31 words
A heat curable polyurethane coating comprising a blocked isocyanate and a curing agent comprising an N,N'-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
Claim 3
Dependent Claim
46 words
A heat curable polyurethane coating as in claim 1 wherein the curing agent comprises an N,N'-dialkyl substituted polyoxyalkylene amine of about 200 to 400 molecular weight with a functionality of about 2 to 3 having 50 to 100% of its amine groups substituted to secondary amines.
Claim 4
Dependent Claim
65 words
A heat curable polyurethane coating as in claim 1 wherein the curing agent comprises an N,N'-dialkyl substituted polyoxyalkylene amine of the general formula: ##STR6## R 1 =CH 3 , C 2 H 5 ; R 2 =CH 3 , C 2 H 5 ; R 3 =H, CH 3 ; x=1-35 and wherein 50 to 100% of the amine groups are substituted to secondary amines.
Claim 5
Independent Claim
35 words
A method for curing a blocked isocyanate which comprises mixing the blocked isocyanate with a curing agent comprising an N,N-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
Claim 6
Independent Claim
35 words
A method for curing a blocked isocyanate which comprises mixing the blocked isocyanate with a curing agent comprising an N,N-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
Claim 7
Independent Claim
45 words
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of about 200 to 400 molecular with a functionality of about 2 to 3 having 50 to 100% of its amine groups substituted to secondary amines.
Claim 8
Independent Claim
45 words
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of about 200 to 400 molecular with a functionality of about 2 to 3 having 50 to 100% of its amine groups substituted to secondary amines.
Claim 9
Independent Claim
65 words
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of the general formula: ##STR7## R 1 =CH 3 , C 2 H 5 ; R 2 =CH 3 , C 2 H 5 ; R 3 =H, CH 3 ; x=1-35 and wherein 50 to 100% of the amine groups are substituted to secondary amines.
Claim 10
Independent Claim
65 words
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of the general formula: ##STR7## R 1 =CH 3 , C 2 H 5 ; R 2 =CH 3 , C 2 H 5 ; R 3 =H, CH 3 ; x=1-35 and wherein 50 to 100% of the amine groups are substituted to secondary amines.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |