US4983683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycyanate esters of polyhydric phenols blended with thermoplastic polymers
Assignee: Novartis Corp
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Filing: 1989-11-06
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Granted: 1991-01-08
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Expires: 2009-11-06
Abstract
Abstract Curable compositions are made from blends of polycyanate ester of polyhydric phenols and amorphous, aromatic thermoplastic resins which are initially soluble in the polycyanate ester but which phase separate during curing of the polycyanate ester.
Inventors
- 👤 David A. Shimp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:28
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L63/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A process for preparing a cured composition which comprises: (A) forming a solution of (a) a polycyanate ester of a polyhydric phenol and (b) an amorphous, aromatic thermoplastic rein, (B) adding a curing catalyst; (C) heating the solution at a temperature of about 200° F. to about 350° F. for a time sufficient for phase separation of (a) and (b) to occur and to gel the polycyanate ester, and (D) curing the gel at a temperature of about 350° F. to about 500° F. for about 30 minutes to about 8 hours, wherein said cured composition has strain energy release rate values in the crack opening mode, G IC , in excess of 1.5 inch-pounds/inch 2 .
Claim 2
Dependent Claim
117 words
A process for preparing a cured composition which comprises: (A) forming a solution of (a) a polycyanate ester of a polyhydric phenol and (b) an amorphous, aromatic thermoplastic rein, (B) adding a curing catalyst; (C) heating the solution at a temperature of about 200° F. to about 350° F. for a time sufficient for phase separation of (a) and (b) to occur and to gel the polycyanate ester, and (D) curing the gel at a temperature of about 350° F. to about 500° F. for about 30 minutes to about 8 hours, wherein said cured composition has strain energy release rate values in the crack opening mode, G IC , in excess of 1.5 inch-pounds/inch 2 .
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein (b), the amorphous, aromatic thermoplastic resin, is present in the amount of about 5 to about 25 weight percent based on the weight of (a) and (b).
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein (b), the thermoplastic resin, has a heat defection temperature of at least 150° C.
Claim 5
Dependent Claim
34 words
The process of claim 3 wherein the thermoplastic resin is selected from the group consisting of polysulfones, polyetherimides, wholly aromatic polyesters, polyether sulfones, wholly imidized polymers of dianhydrides and asymmetric diamines, polyarylethers and polyarylformals.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the thermoplastic resins are terminated with hydroxyl groups, amine groups, or epoxy groups.
Claim 7
Dependent Claim
31 words
The process of claim 1 wherein the polycyanate ester is a polycyanate ester of a dihydric phenol selected from the group consisting of 4,4'-dihydroxy-diphenyl propane, 4,4'-dihydroxydiphenyl oxide, 4,4'-methylene bis(2,6-dimethylphenol) and bis(4-hydroxyphenyl-1,1-ethane.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the catalyst is an active hydrogen class catalyst, a metal coordination class catlayst, or a mixture thereof.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the strain release values in the crack opening mode are about 3 to about 6 inch pounds/inch 2 .
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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |