All posts tagged polyester polyol

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/

Polyurethane Rigid Foam Containing Lignin

Title: COMPOSITIONS OF PHENOLIC BIOPOLYMERS

 Number/Link:WO2015/055662

Applicant/Assignee: Solvay

Publication date: 23-04-2015

“Gist”: Lignin is emulsified in a halogenated polyol and then used to prepare rigid foams.

Why it is interesting: This case is about yet another attempt to incorporate lignin into polyurethane materials. In this invention lignin is dispersed in a halogenated polyol using a suitable milling process. The polyol is preferably a brominated ‘rigid’ polyether.  The dispersed lignin (pref.) has a (d90) mean particle size of less than 100μm and is used in an amount of up to about 50% on the brominated polyether.  The lignin dispersion can then be used together with other polyols in rigid foam formulations.  The resulting foams should have improved flammability properties and the lignin is said to have no negative effect on thermal insulation properties.

Part of a typical lignin structure

Part of a typical lignin structure

 

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by Gerhard Bleys on April 24, 2015  •  Permalink
Posted in Polyols, Rigid Foams
Tagged , , , , , , , , , , ,

Posted by Gerhard Bleys on April 24, 2015

https://purpatents.com/2015/04/24/polyurethane-rigid-foam-containing-lignin/

Cross-Linked Melt-Spun Polyurethane Fibers

Title: ISOCYANATE PREPOLYMER COMPOSITION AND CROSSLINKED POLYURETHANE PREPARED THEREFROM

 Number/Link: WO2015/007731

Applicant/Assignee: BASF

Publication date: 22-01-2015

“Gist”: Melt spinning a TPU – prepolymer blend.

Why it is interesting: Crosslinked polyurethane fibers are produced by melt-spinning a thermoplastic polyurethane which is melt-blended with a specific isocyanate prepolymer composition.  The prepolymer composition is a mixture of a polymeric MDI and the reaction product of a polyester polyol and an excess of 4.4′-MDI. The polyester polyol is prepared from adipic acid together with 2-methyl-1,3-propanediol (MPdiol) and/or trimethylolpropane. The prepolymer composition is characterized by its low viscosity (probably due to the use of the branched polyester).  The crosslinked fibers show an improved tensile set and temperature resistance.

Polymeric MDI

Polymeric MDI

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by Gerhard Bleys on January 23, 2015  •  Permalink
Posted in Adhesives-Coatings, Elastomers, Isocyanates and Prepolymers, Thermoplastics
Tagged , , , , , , ,

Posted by Gerhard Bleys on January 23, 2015

https://purpatents.com/2015/01/23/cross-linked-melt-spun-polyurethane-fibers/

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