Transparent styrol-butadiene block copolymer mixtures

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S338000

Reexamination Certificate

active

07064164

ABSTRACT:
The present invention relates to mixtures comprising linear block copolymers made from vinylaromatic monomers and from dienes of the structure (I) S1-B1-S2and (II) S3-B2-S4, where S1is a block made from vinylaromatic monomers with number-average molar mass Mnin the range from 40,000 to 100,000 g/mol, each of S2, S3and S4is a block made from vinylaromatic monomers with number-average molar mass Mnin the range from 5,000 to 20,000 g/mol, each of B1and B2is a block made from dienes or a copolymer block made from dienes and from vinylaromatic monomers with numberaverage molar mass Mnin the range from 15,000 to 40,000 g/mol, and the ratio of the block copolymers (I)/(II) is in the range from 0.6 to 2.

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