Patent ID: 7943809
Filing Date: 2011-05-17
Classification: C08F,C09K,Y10S

Abstract:
1. A method for inhibiting polymer growth of a polymer present in ethylenically unsaturated monomers, said monomers selected from the group consisting of styrene, α-methylstyrene, styrene sulfonic acid, divinylbenzene, polyvinylbenzene, alkylated styrene, butadiene and isoprene monomers, said process comprising (A) providing the polymer to the ethylenically unsaturated monomers; and (B) adding to the ethylenically unsaturated monomers, an inhibitor composition consisting of: (i) at least one first inhibitor consisting of a hydrogen donor of the structure wherein R 104 , R 105 , R 106 , R 107 , R 108 , and R 109 are independently selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, heterocyclic, substituted alkyl, substituted aryl, OR 110 , —SR 110 , NO, NO 2 , CN, COR 112 , halogen, and/or any two adjacent groups can be taken together to form ring structure(s), respectively of five to seven members, provided that at least one of R 104 , R 105 , R 106 , R 107 , R 108 , and R 109 is OH; R R R (ii) at least one second inhibitor having the following structural formula: wherein R R X (1) are independently selected from the group consisting of halogen, cyano, amido, —S—C (2) taken together, form a ring structure with the nitrogen; and (iii) N-phenyl-N′-(1,4-dimethylpentyl)-para-phenylenediamine and wherein the polymer's growth is decreased by the presence of the inhibitor composition.