Patent ID: 7166737

Claim:
An allyiphosphonate ester expressed by general formula (VI): R 11 R 12 CH—CR 13 ═CR 14 —CR 15 R 16 [P(O)X] (VI) wherein each of R 11 through R 16 individually represents a hydrogen atom, alkyl group, cycloalkyl group, aryl group or aralkyl group, wherein R 11 and R 16 may be combined to form an alkylene group and to form a cyclo alkylene group having 5–10 carbon atoms with adjacent carbon atoms, and X shows a divalent group of —OC(R 17 R 18 )—C(R 19 R 20 )O—, wherein each of R 17 through R 20 individually represents a hydrogen atom, alkyl group, cycloalkyl group, or aryl group, provided that when R 14 is a hydrogen atom, R 11 and R 16 may be combined to form an alkylene group and to form a cyclo alkylene group having 5–10 carbon atoms with adjacent carbon atoms.