US 4,269,759 A · 3,3'-Tetraglycidylsulfonyldianiline thermosetting compositions and polybutadiene rubber modified thermosetting compositions prepared from the same

Abstract

The present invention is directed to (1) an epoxy compound identified as 3,3'-tetraglycidylsulfonyldianiline (referred to herein as 3,3'-TGDDS); (2) a thermosetting composition comprising 3,3'-TGDDS and a curing agent; (3) a thermosetting composition having improved resistance to moisture and to a reduction in the glass transition temperature at elevated temperatures when cured comprising (a) the above epoxy compound, i.e., 3,3'-TGDDS, (b) a polybutadiene rubber or mixture thereof, (c) an epoxy curing agent such as 4,4'-diaminodiphenylsulfone, (d) a free radical initiator and esterification catalyst for the polybutadiene rubber; and (4) a carbon fiber/rubber modified epoxy composite prepared from the thermosetting composition of (3). The 3,3'-TGDDS when melted and admixed with the polybutadiene rubber in a solventless system forms a homogeneous mixture which is stable for extended periods.

Claims8

Dependent claims

A thermosetting composition which when cured has improved resistance to moisture and improved resistance against reductions in the glass transition temperature when subjected to temperatures of about 140.degree. to about 180.degree. F. at a relative humidity of from about 50 to about 100% comprising (a) 3,3'-tetraglydidylsulfonyldianiline;

(b) an effective amount of a curing agent selected from at least one member of the group consisting of 4,4'-diaminodiphenylsulfone and 3,3'-diaminodiphenylsulfone;
(c) a carboxyl terminated polybutadiene rubber comprising from about 80 to about 100%, by weight, 1,2-polybutadiene and from about 20 to about 0%, by weight, 1,4-polybutadiene, wherein said polybutadiene rubber is present in said composition in an amount of from about 30 to about 40%, by weight based on the weight of (a) and rubber;
(d) an effective amount of a chromium octoate esterification catalyst;
and (e) an effective amount of at least one free radical initiator having a decomposition half life at 350.degree. F. of not greater than about 2 minutes.

1 more element

A carbon fiber reinforced composite which when cured has improved resistance to moisture and improved resistance to reductions in the glass transition temperature when subjected to temperatures of about 140.degree. to about 180.degree. F. at a relative humidity of about 50 to about 100% comprising (1) a carbonaceous fibrous ribbon containing at least about 90% carbon by weight in intimate association with (2) a thermosetting composition in the A through C stages of cure comprising (a) 3,3'-tetraglydidylsulfonyldianiline;

(b) an effective amount of a curing agent selected from at least one member of the group consisting of 4,4'-diaminodiphenylsulfone and 3,3'-diaminodiphenylsulfone;
(c) a carboxyl terminated polybutadiene rubber comprising from about 80 to about 100%, by weight, 1,2-polybutadiene and from about 20 to about 0%, by weight, 1,4-polybutadiene, wherein said polybutadiene rubber is present in said composition in an amount of from about 30 to about 40%, by weight based on the weight of (a) and rubber;
(d) an effective amount of chromium octoate esterification catalyst;
and (e) an effective amount of at least one free radical initiator having a decomposition half life at 350.degree. F. of not greater than about 2 minutes.

1 more element

Dependencies are inferred from the claim text.

3,3'-Tetraglycidylsulfonyldianiline thermosetting compositions and polybutadiene rubber modified thermosetting compositions prepared from the same

Life of this patent

3,3'-Tetraglycidylsulfonyldianiline thermosetting compositions and polybutadiene rubber modified thermosetting compositions prepared from the same

Life of this patent

Abstract

Claims8