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US4533727A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing a curable resin from cyanate ester compound and unsaturated 1,2-epoxy compound

Assignee: Mitsubishi Gas Chemical Co Inc
•
Filing: 1984-04-03
•
Granted: 1985-08-06
•
Expires: 2004-04-03
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Abstract

Abstract A process for producing a curable resin comprises reacting (a) at least one cyanate ester compound selected from the group consisting of polyfunctional cyanate esters having 2 or more cyanato groups per one molecule, prepolymers of the cyanate esters or mixtures thereof with (b) at least one compound having 1,2-epoxy group(s) and radical-polymerizable unsaturated double bond(s) in its molecule, the cyanate ester compound (a) and the compound (b) being used so that the ratio of the cyanato group to the 1,2-epoxy group is in the range of about 1:0.25 to about 1:2, in the presence of (c) a radical polymerization inhibitor at a temperature of about 90°--about 140° C. The curable resin produced according to the present invention is capable of giving cured products having excellent heat resistance and electrical properties.

Inventors

  • 👤 Morio Gaku
  • 👤 Hidenori Kimbara
  • 👤 Satoshi Ayano
  • 👤 Susumu Yoshimura

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 17:21
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; C08F20/36; C08F20/26; C08F20/32; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 102 words
A process for producing a curable resin which comprises reacting (a) at least one cyanate ester compound selected from the group consisting of polyfunctional cyanate esters having 2 or more cyanate groups per one molecule, prepolymers of the cyanate esters or mixtures thereof with (b) at least one compound having at least one 1,2-epoxy group and at least one radical-polymerizable unsaturated double bond, the ratio of the cyanate group of (a) to the 1,2-epoxy group of (b) being in the range of about 1:0.25 to about 1:2, in contact with (c) a radical polymerization inhibitor at a temperature of about 140° C.
Claim 2
Dependent Claim 102 words
A process for producing a curable resin which comprises reacting (a) at least one cyanate ester compound selected from the group consisting of polyfunctional cyanate esters having 2 or more cyanate groups per one molecule, prepolymers of the cyanate esters or mixtures thereof with (b) at least one compound having at least one 1,2-epoxy group and at least one radical-polymerizable unsaturated double bond, the ratio of the cyanate group of (a) to the 1,2-epoxy group of (b) being in the range of about 1:0.25 to about 1:2, in contact with (c) a radical polymerization inhibitor at a temperature of about 140° C.
Claim 3
Dependent Claim 18 words
The process as defined in claim 1 wherein compound (a) is 2,2-bis(4-cyanatophenyl)propane and compound (b) is glycidyl methacrylate.
Claim 4
Dependent Claim 19 words
The process as defined in claim 1 wherein compound (a) is 1,4-dicyanato benzene and compound (b) is glycidyl acrylate.
Claim 5
Dependent Claim 14 words
The process as defined in claim 1 wherein the radical polymerization inhibitor is phenothiazine.
Claim 6
Dependent Claim 13 words
The process as defined in claim 1 wherein air is sparged into mixture.
Claim 7
Dependent Claim 30 words
The process as defined in claim 1 wherein the ratio of the cyanate group of (a) to the 1,2-epoxy group of (b) is in the range of 1:0.5 to 1:1.5.
Claim 8
Dependent Claim 16 words
The process as defined in claim 1 the reaction temperature is between 95° and 130° C.
Claim 9
Dependent Claim 17 words
The process as defined in claim 7 wherein the reaction temperature is between 100° and 125° C.

References Cited (Backward Citations)

US4393195A Cited
US4383903A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-08-05 1989-02-04 1989-08-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-08-05 1993-02-04 1993-08-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-08-05 1997-02-04 1997-08-06 $7700.00 Window Closed / Lapsed

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