Process for the preparation of a block copolymer composition
First Claim
1. A Process for preparing a block copolymer composition comprising the following successive steps:
- (1) a step in which a vinyl aromatic monomer and organolithium initiator are introduced into a reactor in the presence of an inert hydrocarbon solvent and polymerized until depletion of the monomer;
(2) a step in which a conjugated diene monomer is added to the polymerization mixture and polymerized until depletion of the monomer;
(3) a step in which a polymerization terminator is added to the polymerization mixture to partially inactivate the living polymer;
(4) a step in which a conjugated diene monomer is added to the polymerization mixture and polymerized until depletion of the monomer;
(5) a step in which a vinyl aromatic monomer is added to the polymerization mixture and polymerized until depletion of the monomer;
(6) a step in which a polymerization terminator is added to the polymerization mixture so as to complete the reaction.
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Abstract
This invention relates to a process for preparing a block copolymer composition, wherein it comprises following successive steps:
a step in which a vinyl aromatic monomer is polymerized in a reactor in the presence of an inert hydrocarbon solvent and organolithium initiator until depletion of the monomer to generate a living polymer; a step in which a conjugated diene monomer is added to the above polymer to synthesize a living diblock copolymer; a step in which a portion of polymerization terminator is added to partially inactivate the living diblock copolymer; steps in which a conjugated diene monomer and aromatic vinyl monomer are sequentially added to generate a mixture of living triblock copolymer and inactivated diblock copolymer; a step in which a polymerization terminator is added to complete the reaction.
This invention has advantages of providing easy, wide-range and fine control of block copolymer compositions in a reactor via well-controlled termination reactions during the sequential block copolymerization.
160 Citations
12 Claims
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1. A Process for preparing a block copolymer composition comprising the following successive steps:
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(1) a step in which a vinyl aromatic monomer and organolithium initiator are introduced into a reactor in the presence of an inert hydrocarbon solvent and polymerized until depletion of the monomer; (2) a step in which a conjugated diene monomer is added to the polymerization mixture and polymerized until depletion of the monomer; (3) a step in which a polymerization terminator is added to the polymerization mixture to partially inactivate the living polymer; (4) a step in which a conjugated diene monomer is added to the polymerization mixture and polymerized until depletion of the monomer; (5) a step in which a vinyl aromatic monomer is added to the polymerization mixture and polymerized until depletion of the monomer; (6) a step in which a polymerization terminator is added to the polymerization mixture so as to complete the reaction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification