Patent ID: 6388153
Filing Date: 2002-05-14
Classification: C07C,C08F,C09D

Abstract:
A process of making alpha-methylstyrene dimer derivatives represented by the formula wherein R1, R2, R3, R4, R5 and R6 are each independently selected from group consisting of hydrogen, â€”CH(O), â€”CN, isocyanato, thioisocyanato, SO3H and salts and esters thereof, NR7R8, a silane, a halogen, â€”C(O)OR9, â€”C(O)NR10R11, â€”CR12(O), â€”C(O)OC(O)R13, â€”C(O)NR14COR15, â€”OC(O)R16, â€”OR17, substituted and unsubstituted alkyl, substituted and unsubstituted alkenyl, substituted and unsubstituted alkynyl, and substituted and unsubstituted aryl; R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 are each independently selected from the group consisting of H, alkyl, aryl, substituted alkyl or substituted aryl; R17 is selected from the group consisting of alkyl, aryl, substituted alkyl or substituted aryl; R1, R2, R3, R4, R5 and R6 cannot all simultaneously be hydrogen; and the alkyl and the substituted alkyls have a chain consisting of 1 to 12 carbons comprising the steps of:a) adding a cobalt chain transfer catalyst, a free-radical initiator and an alpha-methylstyrene monomer containing at least one functional group, in an inert atmosphere, to form a mixture; b) heating the mixture to a temperature in the range of 60Â° C. to 140Â° C.; and c) forming alpha-methylstyrene dimer derivatives containing intact functional groups and having less than 0.1% by weight of 2,4-diphenyl-4-methyl-2-pentene.