Title: POLYURETHANE WITH IMPROVED ABRASION RESISTANCE, THE METHOD FOR PREPARING THE SAME AND USE THEREOF

 Number/Link: US2013059935

Applicant/Assignee: Bayer

Publication date: 7-03-2013

“Gist”: Use of polybutadiene, high in 2,3-trans butene, to improve abrasion resistance of PU elastomers

Why it is interesting: A polybutadiene (not the diol!) with a molecular weight of about 10,000 and containing 10-20% 1,2-cis butene and about 50% of 2,3-trans butene is used in an amount of up to 5% on the total formulation, resulting in a much improved abrasion resistance. It is not clear why the 2,3 trans level has to be so high – it may have to do with crystallinity and/or compatibility with the PU matrix – but no comparative examples are given. While the idea is interesting, it is not new and only a slight variation on a Dow patent of 1996: US5510054.

2,3 cis-, 1,2- and 2,3-trans butene units