Epoxy resins containing thiadiazole and/or oxadiazole moieties
AssigneeThe Dow Chemical Company
InventorsRobert E. Hefner, Jr., Joseph A. Schomaker, Jimmy D. Earls
Life of this patent
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Abstract
Epoxy resins containing more than one vicinal epoxide group per molecule and at least one thiadiazole, oxadiazole or both thiadiazole and oxadiazole moiety per molecule are disclosed, as well as curable and cured compositions thereof. Certain of these epoxy resins possess enantiotropic liquid crystallinity. These enantiotropic epoxy resins are useful in preparing copolymers with high glass transition temperatures and liquid crystalline morphology, which can result in enhanced unidirectional mechanical properties. These epoxy resins are useful in coating, casting, encapsulation, electronic or structural laminate or composite, filament winding or molding applications.
Claims8
An advanced epoxy resin comprising the product of the advancement reaction of
- (A) at least one epoxy resin containing an average of more than one vicinal epoxide group per molecule and at least one thiadiazole, oxadiazole or both at least one thiadiazole and at least one oxadiazole moiety per molecule, said moieties comprising at least one --Ar--(X.sup.1).sub.n --N--(X.sup.1).sub.n --Ar-- group, where Ar is a divalent aromatic group, X.sup.1 is a divalent linking group selected from the group consisting of --O--, --S--, --SO--, --SO.sub.2 --, --CO--, --O--CO--, --CO--O--, --S--CO--, --CO--S--, --NH--CO--, --CO--NH--, --NR--CO--, --CO--NR--, --NH--CO--NH--, --NR--CO--NH--, --NH--CO--NR--, --NH--CO--O-- and --O--CO--NH--, N is thiadiazole or oxadiazole, each R is independently a hydrocarbyl group having from one to about 10 carbon atoms and n is 0 or 1;
- with
- (B) at least one compound containing an average of more than one hydrogen atom per molecule reactive with a vicinal epoxide group, wherein component (A) and component (B) are present in an amount which provides a mole ratio of epoxide reactive hydrogen atoms in component (B) to epoxide groups in component (A) of from about 0.01:1 to about 0.94:1.
A phenoxy resin comprising the product of the advancement reaction of
- (A) at least one epoxy resin containing an average of more than one vicinal epoxide group per molecule and at least one thiadiazole, oxadiazole or both thiadiazole and oxadiazole moiety per molecule, said moieties comprising at least one --Ar--(X.sup.1).sub.n --N--(X.sup.1).sub.n --Ar-- group where Ar is a divalent aromatic group, X1, is a divalent linking group selected from the group consisting of --O--, --S--, --SO--, --SO.sub.2 --, --CO--, --O--CO--, --CO--O--, --S--CO--, --CO--S--, --NH--CO--, --CO--NH--, --NR--CO--, --CO--NR--, --NH--CO--NH--, --NR--CO--NH--, --NH--CO--NR--, --NH--CO--O-- and --O--CONH--, where N is thiadiazole or oxadiazole, n is 0 or 1 and each R is independently a hydrocarbyl group having from one to about 10 carbon atoms, with
- (B) at least one compound containing an average of more than one hydrogen atom per molecule reactive with a vicinal epoxide group, wherein component (A) and component (B) are present in an amount which provides a mole ratio of epoxide reactive hydrogen atoms in component (B):epoxide groups in component (A) of from about 0.95:1 to about 1.05:1.
Dependencies are inferred from the claim text.