1,4-cyclohexanedimethanol
September 8, 2017 14:34
Patent Title: ISOCYANATE-MODIFIED RIGID THERMOPLASTIC POLYMER COMPOSITIONS
Number/Link: WO2017/146948 WO2017/146949
Applicant/Assignee: Eastman Chemical
Publication date: 31 august 2017
“Gist”: A “rigid”, high Tg polyester diol is extended with 4,4′ MDI
Why it is interesting: Rigid, high modulus TPUs have been known for a long time – see e.g. Upjohn’s classic patent on ‘Isoplast’ from 1981. These materials are high hardblock TPUs made from diisocyanates, chain extenders with only a small amount of high molecular weight diol as an impact modifier. According to the current invention however, rigid TPUs can be made using less than 40% (w/w) of diisocyanate, a high Tg polyester diol and optionally some chain extender. The polyester is prepared from ‘rigid’ diols like isosorbide or 1,4-cyclohexanedimethanol together with a ‘rigid’ diacid like terephthalic acid, such that the diol has a MW of more than 400 Dalton and a Tg of more than 40°C. The diisocyanate is pref. 4,4-MDI. The rigid TPUs have a Tg of more than 145°C and a tensile modulus of 1 GPa or higher. They are said to be less moisture sensitive than conventional rigid TPUs.
1,4-cyclohexanedimethanol
Posted by Gerhard Bleys
Categories: Polyols, Thermoplastics
Tags: chain extender, glass transition, hardblock, isoplast, modulus, polyester polyol, Tg, TPE, TPU
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