All posts in category Thermoplastics

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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by Gerhard Bleys on May 13, 2014  •  Permalink
Posted in Thermoplastics
Tagged , , , , , , , ,

Posted by Gerhard Bleys on May 13, 2014

https://purpatents.com/2014/05/13/a-new-type-of-ultra-soft-thermoplastic-polyurethanes/

Crosslinking TPU with Isocyanates.

Title: POLYURETHANE ON THE BASIS OF SOFT THERMOPLASTIC POLYURETHANE

 Number/Link: US2014/0094571

Applicant/Assignee: BASF

Publication date: 3-04-2014 (priority PCT/DE)

“Gist”: A soft TPU is crosslinked using isocyanate dissolved in another TPU.

Why it is interesting: Crosslinking thermoplastic polyurethane parts to improve certain mechanical- and creep properties is known. In this case the crosslinking agent is an isocyanate with a functionality larger than 2, preferably an MDI prepolymer.  The isocyanate is dissolved in another TPU by melt blending in a twin-screw extruder at a temperature below 160°C and pelletizing. Pellets of a soft, polyester-based, TPU with a hardblock content less than 5% are mixed with the isocyanate-containing pellets, injection moulded and post-cured to crosslink the moulded part.

A TPU phone case.

TPU phone case.

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by Gerhard Bleys on April 7, 2014  •  Permalink
Posted in Elastomers, Isocyanates and Prepolymers, Thermoplastics
Tagged , , , , , , ,

Posted by Gerhard Bleys on April 7, 2014

https://purpatents.com/2014/04/07/crosslinking-tpu-with-isocyanates/

Polyurethane “Combination Foam”: a TPU/PU Composite

Title: KOMBINATIONSSCHAUM

 Number/Link:  WO2014/023794   (German)

Applicant/Assignee: BASF

Publication date: 13-02-2014

“Gist”: Foamed TPU particles are embedded in a foamed elastomer of the same chemical composition to improve mechanical properties.

Why it is interesting: Foamed, closed-cell TPU particles are incorporated in a foamed, open-cell PU matrix which has a higher density and is produced from essentially the same chemicals, resulting in perfect compatibility and adhesion between the two components.  In the examples 30-40 % (w/w) of expanded TPU particles with a bulk density (“Shüttdichte”) of 89 kg/m³ are incorporated in an elastomer with a density of 200-300 kg/m³. Size of the TPU particles is not given but the preferred size range is 1mm to 2 cm.

Expanded TPU particles by BASF

Expanded TPU particles by BASF

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by Gerhard Bleys on February 18, 2014  •  Permalink
Posted in composites, Elastomers, Thermoplastics
Tagged , , , , , , , , , ,

Posted by Gerhard Bleys on February 18, 2014

https://purpatents.com/2014/02/18/polyurethane-combination-foam-a-tpupu-composite/

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