Patent ID: 7750062

Claim:
A method of producing a polymeric material, said method including the step of subjecting a starting material which includes a group of sub-formula (XIII) where R 16 is selected from hydrogen, halo, nitro, hydrocarbyl, optionally substituted or interposed with functional groups, or R 2 and R 3 are independently selected from (CR 6 R 7 ) n or a group CR 8 R 9 , CR 6 R 7 CR 8 R 9 or CR 8 R 9 CR 6 R 7 where n is 0, 1 or 2, R 6 and R 7 are independently selected from hydrogen or alkyl, and either one of R 8 or R 9 is hydrogen and the other is an electron withdrawing group, or R 8 or R 9 together form an electron withdrawing group; and R 4 and R 5 are independently selected from CH or CR 10 where CR 10 is an electron withdrawing group, the dotted lines indicate the presence or absence of a bond, X 1 is a group where CX 2 X 3 where the dotted line bond to which it is attached is absent and a group CX 2 where the dotted line bond to which it is attached is present, Y 1 is a group CY 2 Y 3 where the dotted line bond to which it is attached is absent and a group CY 2 where the dotted line bond to which it is attached is present, and X 2 and X 3 , and, if present, Y 2 and Y 3 , are each a C 1 to C 4 alkyl group; to conditions under which polymerisation of the starting material occurs.