| abstract |
PURPOSE: To obtain an optical resin being free from the problem of a pot life and having a high refractive index and sufficient heat resistance by using a polymerizable prepolymer prepared by reacting divinylbenzene or a specified compound with an aliphatic polythiol compound. n CONSTITUTION: This optical resin contains a polymeriable component comprising at least a polymerizable prepolymer obtained by the addition reaction of divinylbenzene and/or a compound of formula I (wherein X is H or CH 3 ) with an aliphatic polythiol compound of formula II [wherein (n) is 1-3; and R is a group formed by bonding at least one kind of a residue selected from among residues of formulas III, IV and V with an S residue within the scope in which the number of carbon atoms, α, is 3-10, the number of sulfur atoms, β, is 2-9, and α<β (provided that an S-S 0residue is excluded)] in such amounts that the functional group equivalent ratio of the vinyl groups to the thiol groups is 1.8-10. An optical resin having a high refractive index and excellent optical properties can be obtained, and it is especially desirable as a crosslinked plastic lens. n COPYRIGHT: (C)1990,JPO&Japio |