US5312887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicyanate prepolymers, use and preparation thereof
Assignee: International Business Machines Corp
•
Filing: 1992-12-09
•
Granted: 1994-05-17
•
Expires: 2012-12-09
Abstract
Abstract Amorphous prepolymers from composition containing bisphenol P dicyanate and bisphenol M dicyanate as well as the cured polymers therefrom are prepared. The prepolymers are especially useful for circuit boards and structural composites.
Inventors
- 👤 Konstantinos I. Papathomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:15
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31547; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
19 words
An amorphous prepolymer from a composition containing (a) 1,4-bis (p-hydroxy cumyl) benzene); and (b) 1,3-bis (para hydroxy cumyl) benzene.
Claim 2
Dependent Claim
19 words
An amorphous prepolymer from a composition containing (a) 1,4-bis (p-hydroxy cumyl) benzene); and (b) 1,3-bis (para hydroxy cumyl) benzene.
Claim 3
Dependent Claim
45 words
The prepolymer of claim 1 wherein said composition contains about 10 to about 60 weight % of (a) and corresponding about 40 to about 90 weight % of (b) wherein the weight % are based upon the total of (a) and (b) in the prepolymer.
Claim 4
Dependent Claim
22 words
The prepolymer of claim 2 wherein about 5 to about 45 percent of the --OCN functional groups in the composition are trimerized.
Claim 5
Dependent Claim
12 words
A composition containing the prepolymer of claim 1 and an organic solvent.
Claim 6
Dependent Claim
11 words
The composition of claim 4 wherein said solvent is a ketone.
Claim 7
Dependent Claim
12 words
The composition of claim 4 wherein said solvent is methyl ethyl ketone.
Claim 8
Dependent Claim
54 words
The composition of claim 6 wherein said prepolymer is from about 10 to about 60 weight % of 1,4-bis (p-hydroxy cumyl) benzene and correspondingly, about 40 to about 90 weight of 1,3-bis (p-hydroxy cumyl) benzene, wherein the weight percents are based upon the total of 1,4-bis (p-hydroxy cumyl) benzene) and 1,3-bis (p-hydroxy cumyl) benzene.
Claim 9
Dependent Claim
16 words
The composition of claim 7 which is substantially free from solvents other than methyl ethyl ketone.
Claim 10
Dependent Claim
52 words
A process for preparing the amorphous prepolymer of claim 1 which comprises: obtaining a composition containing (a) 1,4-bis (p-hydroxy cumyl) benzene and (b) 1,3 (p-hydroxy cumyl) benzene; heating said compositions at a temperature and for a time sufficient to trimerize about 5 to about 45% of the cyanate groups in the composition.
Claim 11
Dependent Claim
45 words
The process of claim 9 wherein said composition contains about 10 to about 60 weight percent of (a) and correspondingly about 40 to about 90 weight percent of (b) wherein the weight percents are based upon the total of (a) and (b) in the composition.
Claim 12
Dependent Claim
14 words
The process of claim 10 wherein the temperature is about 150° to 180° C.
Claim 13
Dependent Claim
17 words
The process of claim 11 wherein the heating is carried out in the absence of a catalyst.
Claim 14
Dependent Claim
10 words
A crosslinked polymer from curing the prepolymer of claim 1.
Claim 15
Dependent Claim
56 words
The crosslinked polymer of claim 13 wherein the prepolymer contains about 10 to about 60 weight percent of 1,4-bis(p-hydroxy cumyl) benzene and correspondingly about 40 to 90 weight percent of 1,3-bis (p-hydroxy cumyl) benzene, wherein the weight percents are based upon the total of 1,4-bis (p-hydroxy cumyl) benzene and 1,3-bis (p-hydroxy cumyl) benzene in the polymer.
Claim 16
Dependent Claim
16 words
A product comprising a fibrous substrate impregnated with a composition containing the prepolymer of claim 1.
Claim 17
Dependent Claim
14 words
The product of claim 15 wherein said prepolymer is cured to a crosslinked polymer.
Claim 18
Dependent Claim
55 words
The product of claim 15 wherein the prepolymer contains about 10 to about 60 weight percent of 1,4-bis(p-hydroxy cumyl) benzene and correspondingly about 40 to 90 weight percent of 1,3-bis (p-hydroxy cumyl) benzene, wherein the weight percents are based upon the total of 1,4-bis (p-hydroxy cumyl) benzene and 1,3-bis (p-hydroxy cumyl) benzene in the polymer.
Claim 19
Dependent Claim
22 words
The product of claim 17 wherein about 5 to about 45 percent of the --OCN functional groups in the composition are trimerized.
Claim 20
Dependent Claim
11 words
The product of claim 15 wherein said composition contains a catalyst.
Claim 21
Dependent Claim
21 words
The product of claim 15 wherein said prepolymer when cured has a glass transition temperature of at least about 170° C.
References Cited (Backward Citations)
US4518761A
Cited
US4740584A
Cited
US4839442A
Cited
US4745215A
Cited
US4987272A
Cited
US4999699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-16 | 1997-11-15 | 1998-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-16 | 2001-11-15 | 2002-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-16 | 2005-11-15 | 2006-05-17 | $7700.00 | Window Closed / Lapsed |