TPU with Crystalline Chain Ends

Title: ARTICLES MADE FROM THERMOPLASTIC POLYURETHANES WITH CRYSTALLINE CHAIN ENDS

 Number/Link: WO2014/189993

Applicant/Assignee: Lubrizol

Publication date: 27-11-2014

Gist”: TPU with improved processability by using crystallizing chain stoppers.

Why it is interesting: While thermoplastic polyurethanes are very interesting engineering materials with an attractive combination of properties, their main drawback is the often very narrow processing window. Especially soft TPUs are both difficult to produce and process. According to this invention TPUs, including soft TPUs, with greatly improved processing properties can be produced by incorporating crystallizing chain stoppers. In the examples straight chain hydrocarbon monols with 33 and 63 carbons are used as chain stoppers in an amount of about 1 to 10% w/w on the total composition.

TPU pellets

TPU pellets

A New Type of Ultra-Soft Thermoplastic Polyurethanes

Title: THERMOPLASTIC POLYURETHANES WITH CRYSTALLINE CHAIN ENDS

 Number/Link: WO2014/070426

Applicant/Assignee: Lubrizol

Publication date: 8-05-2014

Gist”: Easily processable, plasticizer-free ultra-soft TPU can be produced by incorporating a crystallizing polyolefin chain stopper.

Why it is interesting: It is well known that TPU with a shore hardness below about 65A is hard to produce and process because of its stickiness and low solidification/crystallization rate. According to the invention this problem can be solved by using a crystalline chain stopper in addition to the polyol, chain extender and di-isocyanate. The chain stopper is (preferably) a c20 to c70 polyolefin mono-alcohol. Apart from improving processability at low hardness, the incoproration of the olefin chain stopper also improves compatibility of the TPU with olefin thermoplastics.  The chain stopper can also be grafted with e.g. a vinyl alkoxysilane to make a hybrid crosslinkable TPU.  An interesting idea with many potential advantages and interesting effects.

Lubrizol logo

Lubrizol logo

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