DETAILED DESCRIPTION The organic polyepoxides can be a monomeric or polymeric compound or a mixture of compounds having a 1,2-epoxy equivalency greater than 1.
0, that is, in which the average number of 1,2-epoxy groups per molecule is greater than 1.
It is preferred that the organic polyepoxide by polymeric or resinous.
The polyepoxide can be any of the well-known epoxides.
Examples of these polyepoxides have, for example, been described in U.
S.
Pat.
Nos.
2,467,171; 2,615,007; 2,716,123; 3,030,336; 3,053,855; and 3,075,999.
A useful class of polyepoxides are the polyglycidyl ethers of polyphenols, such as Bisphenol A.
These may be prepared, for example, by etherification of a polyphenol with epichlorohydrin or dichlorohydrin in the presence of an alkali.
The phenolic compound may be bis(4-hydroxy-phenyl)2,2-propane; 4,4'-dihydroxybenzophenone; bis(4-hydroxy-phenyl)1,1-ethane; bis(4-hydroxyphenyl)1,1-isobutane; bis(4-hydroxy-tertiarybutyl-phenyl)2,2-propane; bis(2-hydroxy-naphthyl)methane; 1,5-hydroxy-naphthalene; or the like.
Another quite useful class of polyepoxides are produced similarly from novolak resins or similar polyphenol resins.
Also suitable are the similar polyglycidyl ethers of polyhydric alcohols which may be derived from such polyhydric alcohols as ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,4-butylene glycol, 1,5-pentanediol, 1,2,6-hexanetriol, glycerol, bis-(4-hydroxy-cyclohexyl)2,2-propane, and the like.
There can also be employed polyglycidyl ethers of polycarboxylic acids which are produced by the reaction of epichlorohydrin or a similar epoxy compound with an aliphatic or aromatic polycarboxylic acid, such as oxalic acid, succinic acid, glutaric acid, terephthalic acid, 2,6-naphthalene dicarboxylic acid, dimerized linoleic acid and the like.
Examples are diglycidyl adipate and diglycidyl phthalate.
Also useful are polyepoxides derived from the epoxidation of an olefinically unsaturated alicyclid compound.
Included are diepoxides comprising, in part one or more monoepoxides
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