Nippon Oil Fats Co., Ltd.

Mamoru Shimizu

Takeshi Komai

Shuji Suyama

Photopolymerization initiators of the general formula: ##STR1## wherein R.sub.1 and R.sub.1 ' independently stand for a tertiary alkyl group or a tertiary aralkyl group and R.sub.2 and R.sub.2 ' independently stand for a hydrogen atom, a tertiary alkoxy group, or a tertiary aralkyloxy group are disclosed. They are useful for effecting polymerization of radically polymerizable unsaturated compounds.

Photopolymerization initiator and method of photopolymerization by use

Photopolymerization initiators of the general formula: ##STR1## wherein R.sub.1 and R.sub.1 ' independently stand for a tertiary alkyl group or a tertiary aralkyl group and R.sub.2 and R.sub.2 ' independently stand for a hydrogen atom, a tertiary alkoxy group, or a tertiary aralkyloxy group are disclosed. They are useful for effecting polymerization of radically polymerizable unsaturated compounds. Tetra peroxy esters of benzophenone are preferred.

Two molecules of mono-substituted acetaldehyde having the following general formula (I) and one molecule of organic halide having the following general formula (II) are reacted in an alkaline aqueous solution in the presence of a phase transfer catalyst whereby a .beta.-.gamma.-unsaturated aldehyde having the general formula (III) as shown in the following reaction scheme (A) is obtained directly from the monosubstituted acetaldehyde without forming an .alpha.,.beta.-unsaturated aldehyde ##STR1## wherein R.sub.1 is straight chain or branched chain alkyl, alkenyl, cycloalkyl or aryl, R.sub.2 is allyl, substituted allyl, propargyl, substituted propargyl, benzyl or substituted benzyl, and X is halogen.

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Tokoname, Japan

Mamoru Shimizu