Patent ID: 8207367

Claim:
A method of producing a polymerizable phosphate comprising at least one compound selected from the group consisting of a polymerizable phosphate represented by the formula (II), (III), and (IV) by a batch reaction, the method comprising adding at least one compound represented by the formula (I) into a mixture of a polymerizable phosphate reaction product comprising the at least one compound selected from the group consisting of a polymerizable phosphate represented by the formula (II), (III) and (IV), wherein the polymerizable phosphate reaction product is obtained by a pre-batch reaction, and further by reacting with phosphoric acid anhydride, wherein the phosphoric acid anhydride is represented by the formula P 2 O 5 : wherein R 1 represents a hydrogen atom or a straight-chain or a branched alkyl group having from 1 to 4 carbon atoms, R 2 represents a straight-chain or a branched alkylene group having from 2 to 6 carbon atoms and n is an integer from 1 to 3.