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Novel Aliphatic Polyester Polyols for TPU

Patent Title: POLYESTER POLYOLS AND POLYURETHANES

 Number/Link: WO2015/185744

Applicant/Assignee: DSM

Publication date: 10-12-2015

“Gist”: Polyester polyols from succinic- and sebacic acid mixtures

Why it is interesting: Aliphatic polyester polyols used in polyurethane elastomers, are usually based on adipic acid and diols like MEG, DEG, butanediol or mixtures of these. Since recently, succinic acid has become a commercially avaible renewable compound and it makes sense to use it in polyester polyol production. Replacing adipic acid by succinic acid however, results in polyesters with a reduced hydrolysis resistance (at the same polyol molecular weight).  According to this invention this can be solved by using blends of succinic acid with C8 to C36  diacids, most preferably with sebacic (C10) acid.
Not a spectacular innovation and probably not as such patentable but a solid, useful idea.

Sebacic acid

Sebacic acid

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by Gerhard Bleys on December 11, 2015  •  Permalink
Posted in Elastomers, Polyols, Thermoplastics
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on December 11, 2015

https://purpatents.com/2015/12/11/novel-aliphatic-polyester-polyols-for-tpu/

TPU from Asymmetric Chain Extenders

Patent Title: THERMOPLASTIC POLYURETHANE

 Number/Link: WO2015/173337

Applicant/Assignee: Henkel

Publication date: 19-11-2015

“Gist”: TPU is made using diols with 1 prim- and one sec-OH group

Why it is interesting: Thermoplastic polyurethanes (TPU) have many desirable properties but are notoriously difficult to process: they need a high processing temperature (>160°C ) and have a high melt viscosity requiring high shear processing equipment. According to the current invention the melt viscosity can be greatly reduced by using an asymmetric diol as chain extender (i.e. with one pimary and one secondary hydroxyl group) instead of a conventional symmetric diol. In the examples polyester-MDI TPUs extended with asymmetric diols (e.g. 1,3-butanediol or 2,2,4-trimethyl-1,3-pentanediol)  are shown to have a much lower melt viscosity compared to TPU extended with 1,4-butanediol. These TPUs are especially useful as hotmelt adhesives.

2,2,4,-trimethyl-1,3-pentanediol

2,2,4,-trimethyl-1,3-pentanediol

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by Gerhard Bleys on November 20, 2015  •  Permalink
Posted in Adhesives-Coatings, Polyols, Thermoplastics
Tagged , , , , , ,

Posted by Gerhard Bleys on November 20, 2015

https://purpatents.com/2015/11/20/tpu-from-asymmetric-chain-extenders/

UV Crosslinkable TPU

Title: BREATHABLE AND CROSSLINKABLE THERMOPLASTIC POLYURETHANE

 Number/Link:  WO2015/164695

Applicant/Assignee: Lubrizol

Publication date: 29-10-2015

“Gist”: TPU composition containing unsaturated polyester diol and long chain monol

Why it is interesting: A soft, plasticizer-free, TPU with low processing temperature and curable by UV light can be produced by incorporating an unsaturated polyester diol and a linear C20-C65 monol. The unsaturated polyester can e.g. be prepared from butanediol, adipic acid and some trimethylolpropane monallylether.  The TPU is said to be especially useful as UV curable adhesive for fabrics.

Trimethylolpropane monoallyl ether

Trimethylolpropane monoallyl ether


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by Gerhard Bleys on October 30, 2015  •  Permalink
Posted in Adhesives-Coatings, Polyols, Thermoplastics
Tagged , , , , , , , ,

Posted by Gerhard Bleys on October 30, 2015

https://purpatents.com/2015/10/30/uv-crosslinkable-tpu/

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