US 2026/0286034 A1Published application

Hydrogenated block copolymers as compatibilizers

AssigneesRegents of the University of Minnesota, Kraton Corporation

InventorsChristopher J. Ellison, Frank S. Bates, Shuquan Cui, Aparajita Bhattacharya, Robert Bening

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Abstract

A hydrogenated block copolymer is disclosed represented by a structure (EB-EB′)nX, X is a residue of a coupling agent, and n is an integer from 2 to 20. Each block EB and block EB′ independently consists of ethylene (“E”) units and butylene (“B”) units. The block EB has a butylene (“B”) unit content of 12 to 25 wt. %, and the block EB′ has a butylene (“B”) unit content of at least 70 wt. %. The hydrogenated block copolymer has a number average molecular weight (Mn) of >200 kg/mol, a melting temperature (Tm) of <100° C., and a dissolution temperature (Ts) of <70° C. The hydrogenated block copolymer can be used as a compatibilizer for polyolefin blends, exhibiting improved mechanical properties and processability.

Claims20

Dependent claims

A hydrogenated block copolymer having a structure of (EB-EB′)nX,

wherein:
X is a residue of a coupling agent,
n is an integer from 2 to 20, and
each block EB and EB′ independently consists essentially of ethylene units and butylene units;
wherein
block EB contains 1-10 ethyl branches derived from hydrogenated 1,2-addition units of butadiene per 100 backbone carbon atoms,
block EB has a butylene unit content of 10 to 30 wt. %, and
block EB′ has a butylene unit content of at least 70 wt. %;
wherein the hydrogenated block copolymer has:
a number average molecular weight (Mn) of 150-400 kg/mol, as determined by gel permeation chromatography (GPC) calibrated with polybutadiene standards;
a melting temperature (Tm) of <110° C., in accordance with ASTM D3418;
and
a dissolution temperature (Ts) of <70° C.

10 more elements

Dependencies are inferred from the claim text.