All posts tagged TPU

Hydrophobic Thermoplastic Polyurethanes

Title: POLYURETHANE

 Number/Link: US2015/0119535

Applicant/Assignee: Nippon Soda

Publication date: 30-04-2015 (priority PCT/JP)

“Gist”: TPU based on a ‘hybrid’ polybutadiene-polyester polyol and an asymmetric isocyanate

Why it is interesting: According to this invention, TPUs with excellent water-resistance can be prepared from a polyol which is made by reacting a polybutadiene diol with a mole weight of a few 1000 with a cyclic ester monomer, up to a mole weight of about 5000 to 15000 (preferred).  The resulting ‘hybdrid’  (polyester-polybutadiene-polyester) polyol is then prepolymerized with a surplus of an assymetric di-isocyanate. Finally the prepolymer is reacted with a chain extender to make the TPU. In the examples polybutadiene diols are reacted with ε-caprolactone and then with IPDI or 2,4-TDI.  The chain extender used is 1,4-butanediol. Interesting materials and (but) relatively soft as would be expected.

Caprolactone

Caprolactone

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by Gerhard Bleys on May 1, 2015  •  Permalink
Posted in Thermoplastics
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on May 1, 2015

https://purpatents.com/2015/05/01/hydrophobic-thermoplastic-polyurethanes/

Particle-Reinforced Thermoplastic Polyurethane

Title: COMPOSITION AND ARTICLE COMPRISING THERMOPLASTIC POLYURETHANE AND PARTICULATE ENGINEERING POLYMER

 Number/Link: WO2015/031292

Applicant/Assignee: SABIC

Publication date: 5-03-2015

“Gist”: TPU is reinforced with ultrafine particles made from engineering thermoplastics having a melting point of over 200°C.

Why it is interesting: Particulate polyarylsulfone, polyimide, poly(phenylene sulfide) or polyamide, with a melting point or glass transition higher than 200°C and average particle size between 5 and 200 μm, is melt-blended with TPU at a temperature below 200°C and in an amount of 10-30% (w/w).  Alternatively the particles could be mixed (“slurried”) with the polyol and/or isocyanate used to produce the TPU.  The resulting composite is said to have increased hardness, tensile strength and heat resistance.
Sabic is becoming quite active in polyurethane innovation and is apparently looking for synergies with its engineering thermoplastics business.

Poly (1,4-phenylene sulfide) (PPS)

Poly (1,4-phenylene sulfide) (PPS)

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by Gerhard Bleys on March 6, 2015  •  Permalink
Posted in composites, dispersions, Thermoplastics
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on March 6, 2015

https://purpatents.com/2015/03/06/particle-reinforced-thermoplastic-polyurethane/

Supercritically Foamed Thermoplastic Polyurethane

Title: LOW DENSITY FOAM, MIDSOLE, FOOTWEAR, AND METHODS FOR MAKING LOW DENSITY FOAM

 Number/Link: WO2015/017088

Applicant/Assignee: Nike

Publication date: 5-02-2015

“Gist”: TPU blown with supercritical CO2 and/or N2

Why it is interesting: This case relates to foamed TPU (or EVA) with densities down to 150 kg/m³. The low density is accomplished by the combination of a conventional physical blowing agent and a supercritical fluid, specifically supercritical CO2 or N2 or a combination of these. The conventional blowing agent is incorporated into the polymer pellets before these are added to the extruder while the supercritical fluid is added to the molten polymer through a port in the extruder barrel.  The material is then extruded or injection moulded. Nike have filed two more patents on this technology: WO2015/017089 and WO2015/017090.

Nike shoe with EVA midsole

Nike shoe with foamed thermoplastic midsole

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by Gerhard Bleys on February 9, 2015  •  Permalink
Posted in Elastomers, Thermoplastics
Tagged , , , , , , ,

Posted by Gerhard Bleys on February 9, 2015

https://purpatents.com/2015/02/09/supercritically-foamed-thermoplastic-polyurethane/

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