| abstract |
NEW MATERIAL: A compd. of formula I [X is an alkyl, HO-R [R is O, S, SO, CO, etc., an alkenylene, an alkinylene, CH 2 -Z-CH 2 (Z is a bivalent alicyclic, arom. or heterocyclic)]; Y is OH, formula II (Ar 1 , Ar 2 are phenyl); (n) is 12 to 30]. n EXAMPLE: A compd. of formula III. n USE: A photoinitiator. The compd. has low migration tendency and low extraction property, is odorless and is capable of preventing the yellowing of a photopolymerized base material. n PROCESS: The compd. of the formula I is obtd. by subjecting a benzyldialkyketal of formula IV and a diol of formula V to ketal conversion within a range of molar ratio 0.5 to 2. n COPYRIGHT: (C)1989,JPO |