Epoxides and acrylonitrile react with spiroacetal diamines of the formula to form a viscous liquid which is a good hardener for epoxy resin intermediates, in the formula R being hydrogen, methyl, or ethyl, and R' being alkyl having one to six carbon atoms. Epoxy resins cured by means of the hardener are flexible, colorless and transparent.
Polymeric compositions are provided which are the reaction product of spiroorthocarbonates and epoxy resins and undergo reduced bulk polymerization shrinkage. The spiroorthocarbonates are of the general formula: ##STR1## wherein X=O or S; R.sub.1, and R.sub.2 are independently selected from the group consisting of H, alkyl, aryl, substituted alkyl, and substituted aryl; R.sub.3 and R.sub.4 =--(CH.sub.2).sub.n --O--R.sub.5 ; n=1 or 2; R.sub.5 =alkyl, aryl, substituted aryl, substituted alkyl, ##STR2## R.sub.6 =H, alkyl, aryl, substituted alkyl, or substituted aryl; and R.sub.7 =alkyl, aryl, substituted alkyl, or substituted aryl.
A desensitizer composition for desensitizing a color developer capable of reaction with a substantially colorless color former to form a color containing as a desensitizer at least one of (a) a spiroacetal diamine compound represented by the following general formula: ##EQU1## wherein R represents a hydrogen atom or an alkyl group, and R.sub.1 and R.sub.2 each represents a straight or branched chain alkylene residue, or (b) the reaction product of said spiroacetal diamine compound with a compound having at least one oxirane ring.
