Terminal-functionalized polymer, rubber composition containing same and related processes
AssigneeBridgestone Corporation
InventorYuan-Yong Yan
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Abstract
Disclosed herein are a terminal-functionalized polymer, rubber compositions containing the polymer, and related processes for preparing the polymer. The functionalizing compound used to prepare the terminal-functionalized polymer has a specified formula which includes a silicon atom and a moiety containing at least two carbon-carbon double bonds in a conjugated configuration.
Claims20
A terminal-functionalized polymer having a structure according to formula I
- (P)nSi(R)k(OR)m—SP—U (I)
- wherein P is a polymer chain comprising at least one type of conjugated diene monomer and optionally at least one type of vinyl aromatic monomer,
- n is an integer of 1-3, m is an integer of 0-2, k is an integer of 0 or 1, m+n+k=3,
- each R is independently selected from:
- (i) an alkyl group having 1 to 20 carbons, (ii) a cycloalkyl group having 3 to 20 carbons, (iii) an aryl group having 6 to 20 carbons, (iv) an alkylaryl group having 7 to 20 carbons, or (v) SiR1R2R3 where each of R1, R2
- and R3 is independently selected from H, (i), (ii), (iii), or (iv)
- SP is a spacer group having at least two carbon atoms and is optionally substituted with at least one heteroatom selected from S, O, or NR, and
- U is a moiety containing at least two carbon-carbon double bonds in a conjugated configuration.
A process for preparing a terminal-functionalized polymer, the process comprising reacting the live end of a polymer chain with a functionalizing compound having formula II, wherein the polymer chain comprises at least one type of conjugated diene monomer and optionally at least one type of vinyl aromatic monomer,
- (OR)oSi(R)p—SP—U (II)
- wherein o is an integer of 2-3, p is an integer of 0-1, o+p=3,
- each R is independently selected from:
- (i) an alkyl group having 1 to 20 carbons, (ii) a cycloalkyl group having 3 to 20 carbons, (iii) an aryl group having 6 to 20 carbons, (iv) an alkylaryl group having 7 to 20 carbons, or (v) SiR1R2R3 where each of R1, R2 and R3 is independently selected from H, (i), (ii), (iii), or (iv),
- SP is a spacer group having at least two carbon atoms and is optionally substituted with at least one heteroatom selected from S, O, or NR, and
- U is a moiety containing at least two carbon-carbon double bonds in a conjugated configuration.
Dependencies are inferred from the claim text.