Preparation of branched polydienes and polydiene copolymers
OwnerSem Raj TAMANG, Madoka KIMURA +5inventors
InventorsSem Raj TAMANG, Madoka KIMURA, Bret J. CHISHOLM, Terrence E. HOGAN, Laura S. KOCSIS, Rita E. COOK, Vrushali BHAGAT
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Abstract
A method for preparing a branched polymer, the method comprising (i) preparing a multi-site initiator by reacting polyalkenyl compound with an alkyl lithium compound; (ii) introducing the multi-site initiator, monomer, and a potassium alkoxide to form a polymerization mixture, where the polymerization mixture includes a molar ratio of potassium to lithium of greater than 0.150:1; and (iii) allowing the monomer to polymerize and form a branched polymer.
Claims62
A method for preparing a branched polymer, the method comprising:
- (i) preparing a multi-site initiator by reacting polyalkenyl compound with an alkyl lithium compound;
- (ii) introducing the multi-site initiator, monomer, and a potassium alkoxide to form a polymerization mixture, where the polymerization mixture includes a molar ratio of potassium to lithium of greater than 0.150:1;
- and
- (iii) allowing the monomer to polymerize and form a branched polymer.
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A vulcanizable composition comprising:
- (i) a branched polymer prepared by
- (a) providing preparing a multi-site initiator by reacting polyalkenyl compound with an alkyl lithium compound;
- (b) introducing the multi-site initiator, monomer, and a potassium alkoxide to form a polymerization mixture, where the polymerization mixture includes a molar ratio of potassium to lithium of greater than 0.150:1;
- and
- (c) allowing the monomer to polymerize and form a branched polymer;
- (ii) silica;
- and
- (iii) a curative.
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Dependencies are inferred from the claim text.