Patent US4804740A successfully refreshed from Google Patents.
US4804740A
Expired / Lapsed
US
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Cyanate ester with urea latent cure accelerator
Assignee: BP Corp North America Inc
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Filing: 1987-07-08
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Granted: 1989-02-14
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Expires: 2007-07-08
Abstract
Abstract Urea compounds having a plurality of substituents selected from hydrogen, substituted hydrocarbyl radicals and unsubstituted hydrocarbyl radicals are good latent cure accelerators for thermosetting cyanate resin formulations. The resulting cyanate resin formulations are useful as coatings, adhesives and as impregnating resins, particularly in applications where extended storage at or near room temperature is desired.
Inventors
- 👤 Hugh C. Gardner
- 👤 Richard H. Newman-Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:23
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; C08G73/0661; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/68; C08G59/686; C08L; C08L63/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A thermosetting composition comprising a cyanate ester and a urea compound having the structural formula RR 1 NCONR 2 R 3 wherein R and R 2 are independently selected from the group consisting of hydrogen and organo radicals, and R 1 and R 3 are independently selected organo radicals.
Claim 2
Dependent Claim
49 words
A thermosetting composition comprising a cyanate ester and a urea compound having the structural formula RR 1 NCONR 2 R 3 wherein R and R 2 are independently selected from the group consisting of hydrogen and organo radicals, and R 1 and R 3 are independently selected organo radicals.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein said organo radicals are hydrocarbyl radicals selected from the group consisting of alkyl, aralkyl and aryl radicals.
Claim 4
Dependent Claim
25 words
A thermosetting composition comprising a cyanate ester and a urea compound selected from the group consisting of alkyl aryl ureas, aryl ureas and mixtures thereof.
Claim 5
Dependent Claim
25 words
A thermosetting composition comprising a cyanate ester and a urea compound selected from the group consisting of alkyl aryl ureas, aryl ureas and mixtures thereof.
Claim 6
Dependent Claim
31 words
The composition of claim 3 wherein the urea compound is an alkyl aryl urea selected from the group consisting of 1,1-dimethyl-3-phenyl urea, 1,1-dimethyl-3-(4-chlorophenyl) urea, 1,1-dimethyl-3-(3,4-dichlorophenyl) urea, 2,4-bis-(N,N-dimethylureido) toluene, and mixtures thereof.
Claim 7
Dependent Claim
25 words
The composition of claim 3 wherein the urea is a diaryl urea selected from the group consisting of 1,3-diphenyl urea, 1-(4-chlorophenyl)-3-(3,4-dichlorophenyl) urea and mixtures thereof.
Claim 8
Dependent Claim
34 words
A thermosetting composition comprising 100 pbw of a cyanate ester and from about 0.5 to about 12 pbw of a urea compound selected from the group consisting of alkyl aryl ureas and aryl ureas.
Claim 9
Dependent Claim
34 words
A thermosetting composition comprising 100 pbw of a cyanate ester and from about 0.5 to about 12 pbw of a urea compound selected from the group consisting of alkyl aryl ureas and aryl ureas.
Claim 10
Dependent Claim
22 words
The composition of claim 6, wherein said urea compound is selected from the group consisting of from 1,1-dialkyl-3-aryl ureas and 1,3-diaryl ureas.
Claim 11
Dependent Claim
31 words
The composition of claim 6 wherein said urea compound is selected from the group consisting of 1,1-dimethyl-3-phenyl urea, 1,1-dimethyl-3-(4-chlorophenyl) urea, 1,1-dimethyl-3-(3,4-dichlorophenyl) urea, 2,4-bis(N,N-dimethylureido) toluene, 1,3-diphenyl urea, 1-(4-chlorophenyl)-3-(3,4-dichlorophenyl) urea and mixtures thereof.
Claim 12
Dependent Claim
22 words
The composition of claim 8 wherein the cyanate ester is an aryl cyanate ester having a plurality of cyanate groups per molecule.
References Cited (Backward Citations)
US4142034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |