US4839442A
Expired / Lapsed
US
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Low viscosity noncrystalline dicyanate ester blends with prepolymers of dicyanate esters
Assignee: Huntsman Advanced Materials Americas LLC
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Filing: 1988-06-20
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Granted: 1989-06-13
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Expires: 2008-06-20
Abstract
Abstract Low viscosity dicyanate esters are made from bisphenols wherein the bridging member between the phenyl groups is unsymmetrical. These dicyanate esters are blended with prepolymers of dicyanate esters to form low viscosity non-crystallizing resins useful in preparing composites.
Inventors
- 👤 Wallace M. Craig, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:12
CPC Classifications
C; C07; C07C; C07C261/00; C07C261/02; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; C08L; C08L79/00; C08L79/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
114 words
A curable composition comprising a blend of: (a) a dicyanate ester of a dihydric phenol having the formula: ##STR3## wherein R and R' are difference and wherein R is H or C 1 to C 3 alkyl and R' is C 1 to C 4 alkyl, and (b) a prepolymer of dicyanate esters of dihydric phenols different from the dicyanate ester of (a) wherein about 5 to about 50 percent of the cyanate functional groups are cyclotrimerized, wherein (a) and (b) are present in the amount of about 1 to about 99 parts by weight of (a) and about 99 to about 1 parts by weight of (b), the total weight being 100 parts.
Claim 2
Dependent Claim
114 words
A curable composition comprising a blend of: (a) a dicyanate ester of a dihydric phenol having the formula: ##STR3## wherein R and R' are difference and wherein R is H or C 1 to C 3 alkyl and R' is C 1 to C 4 alkyl, and (b) a prepolymer of dicyanate esters of dihydric phenols different from the dicyanate ester of (a) wherein about 5 to about 50 percent of the cyanate functional groups are cyclotrimerized, wherein (a) and (b) are present in the amount of about 1 to about 99 parts by weight of (a) and about 99 to about 1 parts by weight of (b), the total weight being 100 parts.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein R is hydrogen and R' is methyl.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein R is methyl and R' is ethyl.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein the prepolymer is a homopolymer of a dicyanate ester of dihydric phenol.
Claim 6
Dependent Claim
21 words
The composition of claim 1 wherein the prepolymer is a copolymer of at least two different dicyanate esters of dihydric phenols.
Claim 7
Dependent Claim
14 words
The composition of claim 4 wherein the prepolymer is a prepolymer of di(cyanatophenyl) ether.
Claim 8
Dependent Claim
13 words
The composition of claim 4 wherein the prepolymer is a prepolymer of bis(4-cyanatophenyl)-2,2-propane.
Claim 9
Dependent Claim
14 words
The composition of claim 4 wherein the prepolymer is a prepolymer of bis(4-cyanato-3,5-dimethylphenyl methane.
Claim 10
Dependent Claim
16 words
The composition of claim 5 wherein the prepolymer is a co-polymer of bis(4-cyanatophenyl)-2,2-propane and bis(4-cyanato-3,5-dimethylphenyl methane.
Claim 11
Dependent Claim
114 words
A curable composition comprising a blend of: (a) a dicyanate ester of a dihydric phenol having the formula: ##STR4## wherein R and R' are different and wherein R is H or C 1 to C 3 alkyl and R' is C 1 to C 4 alkyl, and (b) a prepolymer of dicyanate esters of dihydric phenols different from the dicyanate ester of (a) wherein about 5 to about 50 percent of the cyanate functional groups are cyclotrimerized, wherein (a) and (b) are present in the amount of about 5 to about 8 parts by weight of (a) and about 95 to about 20 parts by weight of (b), the total weight being 100 parts.
Claim 12
Dependent Claim
114 words
A curable composition comprising a blend of: (a) a dicyanate ester of a dihydric phenol having the formula: ##STR4## wherein R and R' are different and wherein R is H or C 1 to C 3 alkyl and R' is C 1 to C 4 alkyl, and (b) a prepolymer of dicyanate esters of dihydric phenols different from the dicyanate ester of (a) wherein about 5 to about 50 percent of the cyanate functional groups are cyclotrimerized, wherein (a) and (b) are present in the amount of about 5 to about 8 parts by weight of (a) and about 95 to about 20 parts by weight of (b), the total weight being 100 parts.
Claim 13
Dependent Claim
13 words
The composition of claim 10 wherein R is methyl and R' is ethyl.
Claim 14
Dependent Claim
13 words
The composition of claim 10 wherein R is H and R' is methyl.
Claim 15
Dependent Claim
19 words
The composition of claim 10 wherein about 15 to about 40 percent of the cyanate functional groups are cyclotrimerized.
Claim 16
Dependent Claim
19 words
The composition of claim 13 wherein the prepolymer is a homopolymer of a dicyanate ester of a dihydric phenol.
Claim 17
Dependent Claim
13 words
The composition of claim 14 wherein the prepolymer is a prepolymer of bis(4-cyanatophenyl)-2,2-propane.
Claim 18
Dependent Claim
14 words
The composition of claim 14 wherein the prepolymer is a prepolymer of bis(4-cyanato-3,5-dimethylphenyl) methane.
Claim 19
Dependent Claim
13 words
The composition of claim 14 wherein the prepolymer is a prepolymer of di(cyanatophenyl)ether.
Claim 20
Dependent Claim
21 words
The composition of claim 10 wherein the prepolymer is a copolymer of at least two different dicyanate esters of dihydric phenols.
Claim 21
Dependent Claim
16 words
The composition of claim 18 wherein the prepolymer is a co-prepolymer of bis(4-cyanatophenyl)-2,2-propane and bis(4-cyanato-3,5-dimethylphenyl) methane.
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |