All posts tagged polyester polyol

Ionic Liquids for Improved Hydrolysis Resistance of Polyester Polyurethanes

Title: HYDROLYSIS-RESISTANT POLYURETHANE MOULDED ARTICLES MADE OF POLYESTER POLYURETHANE

 Number/Link: WO2014/095438  (German)

Applicant/Assignee: BASF

Publication date: 26-06-2014

“Gist”: Polyester polyurethane elastomers containing carbodiimides, together with an ionic liquid and an amine catalyst in a specific ratio, show improved hydrolysis resistance.

Why it is interesting: Polyester PU elastomers show higher mechanical properties compared to polyether elastomers but have have a much worse hydrolysis resistance.  It is well known that the hydrolysis resistance can be improved by using sterically hindered carbodiimides (commercially known e.g. as Stabaxol®).  This invention shows that hydrolysis resistance can be even more improved by using a specific molecular ratio (pref. 0.5 : 1 to 2 : 1)  of  ionic liquid to amine catalyst in combination with the carbodiimides. The effect is apparent from the examples where 1-ethyl-3-methylimidazolium ethylsulfate was used as ionic liquid together with ethylenediamine as catalyst.  No theory or explanation for the effect is given and it is not immediately clear to me how this interesting synergy works.

Ionic liquid as used in the invention

Ionic liquid as used in the invention

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by Gerhard Bleys on June 30, 2014  •  Permalink
Posted in Elastomers
Tagged , , , , , , ,

Posted by Gerhard Bleys on June 30, 2014

https://purpatents.com/2014/06/30/ionic-liquids-for-improved-hydrolysis-resistance-of-polyester-polyurethanes/

Prepregs from Glass Fiber and Reactive Polyurethane Powder

Title: PREPREGS AND MOLDINGS PRODUCED THEREFROM

 Number/Link: US2014065911

Applicant/Assignee: Evonik

Publication date: 6-03-2014

“Gist”: A reactive polyurethane powder is prepared from a mixture of a  solid polyester polyol and a solid dimerised IPDI and subsequently used to make glass fiber prepregs.

Why it is interesting:  A polyurethane powder is made from (pref.) a mixture of  a solid (at room temperature) polyster polyol and a solid, blocked isocyanate.  The isocyanate is preferably an “internally” blocked IPDI.  Internally blocked meaning that the isocyanate contains uretidinedione groups.  The powder is scattered over a fibrous support and heated to over melting temperature but below curing temperature to make the prepreg.  Prepregs made with PU powder instead of the conventional resins have the advantage of being non-sticky, non-toxic and of having a very high storage stability (45 days in the examples).

Prepreg production with reactive PU powder

Prepreg production with reactive PU powder

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by Gerhard Bleys on March 11, 2014  •  Permalink
Posted in composites, Isocyanates and Prepolymers
Tagged , , , , , , , ,

Posted by Gerhard Bleys on March 11, 2014

https://purpatents.com/2014/03/11/prepregs-from-glass-fiber-and-reactive-polyurethane-powder/

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