All posts in category Thermoplastics

Thermoplastic Polythiourethanes for 3D Printing

Patent Title: THIOURETHANE POLYMERS, METHOD OF SYNTHESIS THEREOF AND USE IN FUSED FILAMENT FABRICATION PRINTING

 Number/Link:  WO2018/035102

Applicant/Assignee:  University of Texas

Publication date: 22 February 2018

“Gist”: Polythiourethanes from diisocyanates and dithiols are used in FFF printing

Why it is interesting: Fused Filament Fabrication (FFF), which is actually the same thing as  Fused Deposition Modeling (FDM) is a popular and cheap additive manufacturing technology in which a thermoplastic filament is molten and ‘printed’ in layers. Many off-the-shelf thermoplastics can be used in FFF but these often do not have the correct melt characteristics resulting in printed objects of poor quality. According to this invention FFF-optimized thermoplastics can be prepared by reacting dithiols with diisocyanates into polythiourethanes.  The reaction is carried out in an aprotic solvent and catalysed by a non-nucleophilic base. In an example 2,2′-(ethylenedioxy)diethanethiol is reacted with HDI in DMF and catalysed by triethylamine. FFF printed parts of this polymer are said to show high toughness and less water uptake compared to TPU and polyamides.

polythiourethane

Polythiourethane according to the invention

 

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by Gerhard Bleys on February 23, 2018  •  Permalink
Posted in Thermoplastics
Tagged , , , , , ,

Posted by Gerhard Bleys on February 23, 2018

https://purpatents.com/2018/02/23/thermoplastic-polythiourethanes-for-3d-printing/

Polyurethanes from Alpha Glucan

Patent Title: POLYURETHANE POLYMERS COMPRISING POLYSACCHARIDES

 Number/Link: WO2018/017789

Applicant/Assignee:  Du Pont

Publication date: 25 january 2018

“Gist”: Polyurethanes containing poly alpha 1,3-glucan

Why it is interesting: The invention is related to the preparation of different types of polyurethanes comprising poly alpha 1,3-glucan, which is a polymeric D-glucose having alpha 1,3 glycosidic bonds (as opposed to most natural glucose polymers which show α or β 1,4 glycoside linkages). Alpha 1,3 glucan can be prepared by enzymatic polymerization using sucrose and a glycosyltransferase. The glucan can be mixed with polyols and reacted with isocyanates to prepare polyurethanes.  Many examples are given ranging from PUDs, films, flexible foams to TPUs.

glucan

Poly alpha 1,3-glucan

 

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by Gerhard Bleys on January 29, 2018  •  Permalink
Posted in Adhesives-Coatings, dispersions, Elastomers, Flexible Foams, Polyols, Thermoplastics
Tagged , , , , , ,

Posted by Gerhard Bleys on January 29, 2018

https://purpatents.com/2018/01/29/polyurethanes-from-alpha-glucan/

Fluorinated Thermoplastic Polyurethanes

Patent Title: SHOE UPPERS & CASE FOR PORTABLE DEVICES

 Number/Link: WO2018/007359  WO2018007360

Applicant/Assignee:  Solvay

Publication date:  11 January 2018

“Gist”:  F-TPUs are prepared by incorporating perfluoro diols

Why it is interesting: The current inventions are about fluorinated TPU and its applications. The F-TPUs are prepared by replacing part of the polyol with hydroxyl-ended fluorinated polyethers. In the examples fluorinated polyether diols are used in different ratios to conventional polyester-, PTMEG-, CAPA- and polycarbonate diols and reacted with MDI or HDI and BDO or HDO as chain extenders. The F-TPUs can be used as uppers for footwear and as cases for smartphones and are said to have improved stain resistance and – surprisingly- a soft feel to the touch.

case

F-TPU smartphone case

 

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by Gerhard Bleys on January 15, 2018  •  Permalink
Posted in Polyols, Thermoplastics
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Posted by Gerhard Bleys on January 15, 2018

https://purpatents.com/2018/01/15/fluorinated-thermoplastic-polyurethanes/

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