Functionalized initiator, method of making initiator and functionalized elastomer
The present invention is directed to a functionalized polymerization initiator, comprising the reaction product of an alkyl lithium compound and a compound of formula 1 wherein R 1 =alkyl (C1-C8), aryl, substituted aryl, or —SiR 3 where R 3 are independently C1-C8 alkyl, preferably —SiMe 3 where Me is methyl, or —Si(CH 3 ) 2 C(CH 3 ) 3 ; R 2 =C1-C8 alkyl, aryl, or substituted aryl, or —SiR 3 , preferably —CH 3 ; and n=0-3. The invention is further directed to a method of making the functionalized inititiator, and a method of making a functionalized elastomer using the inititator.
1. A functionalized polymerization initiator, comprising the reaction product of an alkyl lithium compound and a compound of formula 1
wherein R 1 ═C1—C8 alkyl, aryl, substituted aryl, or —SiR 3 where R is independently C1—C8 alkyl,
wherein R 1 optionally is one of —SiMe 3 where Me is methyl, or —Si(CH 3 ) 2 C(CH 3 ) 3 ;
wherein R 2 =C1-C8 alkyl, aryl, or substituted aryl, or —SiR 3 ;
wherein R 2 optionally is —CH 3 ; and
n=0-3.
2. The functionalized polymerization initiator of claim 1 , wherein the compound of formula 1 is of formula 2
wherein R 1 is a C1 to C3 alkyl group, or a trimethylsilyl group.
3. The functionalized polymerization initiator of claim 1 , wherein the alkyl lithium compound is selected from the group consisting of n-butyllithium, sec-butyllithium, n-hexyllithium, n-octyllithium, tertoctyllithium, n-decyllithium, phenyllithium, 1-naphthyllithium, 4-butylphenyllithium, p-tolyllithium, 4-phenylbutyllithium, cyclohexyllithium, 4-butylcyclohexyllithium, and 4-cyclohexylbutyllithium.