US 7,608,669 B2 · Preparation of impact-resistant thermoplastic materials on the basis of styrene/butadiene copolymers with polydisperse blocks

Abstract

This invention describes the obtainment of impact-resistant materials from a block copolymer that comprises as monomers an alkadiene (conjugated diene) and a vinyl aromatic compound, which is used as impact modifier to obtain such materials and in which, at least, one of the blocks of the vinyl aromatic compound is polydisperse. The invention allows obtaining morphologies such as rods, points or capsules by incorporating such copolymer into a polymeric matrix derived from vinyl aromatic monomers independently from other agents such as chain transfer agents, and achieving increases, in the impact values up to 50% through the use of the copolymer of this invention.

Claims18

Dependent claims

A composition for producing impact-resistant thermoplastic materials consisting of a block copolymer that comprises as monomers an alkadiene and a vinyl aromatic monomer,

wherein the block copolymer being selected from the group consisting of linear, radial, perfect and partially randomized blocks having the formula (I):
[(B—(B/S)i—S)j]k-Z (I),
wherein i, j and k are an integer equal to or greater than 1;
Z is a residue of a coupling or a termination agent;
S is the vinyl aromatic monomer;
and
B is the alkadiene, which may optionally be totally or partially hydrogenated;
wherein the block copolymer has a B/S ratio from 70/30 to 60/40;
and at least one block of the vinyl aromatic monomer in the block copolymer is polydispersed having a polydispersity from 1.01 to 4.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/537,738Filed 8 Nov 2002

Published

US 2006/0194915 A131 Aug 2006

Granted

27 Oct 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C08F 297/04
Using a catalyst of the anionic type: polymerising vinyl aromatic monomers and conjugated dienes
Y10S 525/94
Synthetic resins or natural rubbers -- part of the class 520 series: hydrogenation of a polymer
C08F
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Y10S
Technical subjects covered by former uspc cross-reference art collections [xracs] and digests

Preparation of impact-resistant thermoplastic materials on the basis of styrene/butadiene copolymers with polydisperse blocks

Life of this patent

Preparation of impact-resistant thermoplastic materials on the basis of styrene/butadiene copolymers with polydisperse blocks

Life of this patent

Abstract

Claims18