US 2003/0216511 A1 · Bimodal block copolymer, process for manufacturing method and its usage

Abstract

The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hexa-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator, and a tri-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4). The bimodal linear block copolymer is prepared by adding more than one charge of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Claims16

Dependent claims

A bimodal linear block copolymer comprising a hexa-block copolymer of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block-conjugated diene block-vinyl aromatic block, and a tri-block copolymer of vinyl aromatic block-conjugated diene block-vinyl aromatic block, wherein the bimodal linear block copolymer containing a tapered block and comprising 55 to 95 wt. % of at least one vinyl aromatic monomer having 8 to 12 carbon atoms and 5 to 45 wt. % of at least one conjugated diene monomer having 4 to 6 carbon atoms.

A method for preparing a bimodal linear block copolymer, comprising:

(1) adding an initiator and a vinyl aromatic monomer to form a polyvinyl aromatic living polymer chain;
(2) adding both a conjugated diene monomer and a vinyl aromatic monomer to the polyvinyl aromatic living polymer chain to form a living polymer chain of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block;
(3) further adding an initiator and a vinyl aromatic monomer to the living polymer chain obtained in the step (2) to continuously grow a vinyl aromatic block of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block and form another living polymer of vinyl aromatic block;
(4) adding a conjugated diene monomer to the product of the step (3) to form a living polymer of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block-conjugated diene block and living polymer of vinyl aromatic block-conjugated diene block;
(5) adding a vinyl aromatic monomer to the product of the step (4) to form a living polymer of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block-conjugated diene block-vinyl aromatic block and a living polymer of vinyl aromatic block-conjugated diene block-vinyl aromatic block;
and
(6) adding a polymerization terminator to terminate polymerization and performing polymer isolation to prepare a bimodal linear block copolymer comprising a hexa-block copolymer of vinyl aromatic block-conjugated diene block-tapered block-vinyl aromatic block-conjugated diene block-vinyl aromatic block and a tri-block copolymer of vinyl aromatic block-conjugated diene block-vinyl aromatic block,
wherein the bimodal linear block copolymer containing a tapered block and comprising 55 to 95 wt. % of at least one vinyl aromatic monomer having 8 to 12 carbon atoms and 5 to 45 wt. % of at least one conjugated diene monomer having 4 to 6 carbon atoms.

5 more elements

Dependencies are inferred from the claim text.

Bimodal block copolymer, process for manufacturing method and its usage

Life of this patent

Bimodal block copolymer, process for manufacturing method and its usage

Life of this patent

Abstract

Claims16