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

PIPA Polyol Made From “Conventional” Polyol

Title: PROCESS FOR THE PREPARATION OF A POLYOL COMPOSITION

 Number/Link: WO2014/037558

Applicant/Assignee: SHELL

Publication date: 13-03-2014

Gist”: A PIPA polyol is made from TDI,  TELA and a high sec-OH polyol which is added in two stages.

Why it is interesting: PIPA polyols are a class of ‘filled’ polyols containing dispersed polyurethane particles and are often used in flexible foams to improve hardness and air flow. These polyols are usually produced by dispersing an olamine, like triethanolamine (TELA), in an EO-tipped EO/PO polyether polyol and reacting it with isocyanate under mixing.  Producing PIPA polyols from a high secondary-OH containing (“conventional”) polyol, i.e. an all- PO or EO/PO random polyol would have cost advantages but -according to SHELL- results in an unstable polyol which produces closed-celled flexible foam. The trick they invented to solve this problem is to produce the particle dispersion from TELA and TDI in about 50% of the total amount of polyol used and adding the remainder of the polyol in a second step.  Remarkably this simple trick appears to be new and patentable.

Triethanolamine

Triethanolamine

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