All posts in category Elastomers

Solid Polyurethane Electrolyte

Title: POLYURETHANE BASED MEMBRANES AND/OR SEPARATORS FOR ELECTROCHEMICAL CELLS

 Number/Link: WO2013/062990

Applicant/Assignee: Lubrizol

Publication date: 2/05/2013

“Gist”:  TPU prepared from a DEG-adipate polyester diol, HQEE and 4,4′-MDI can be used as Li ion-conducting electrolytes  in electrochemical cells.

Why it is interesting: Because of the rapidly increasing use of phones, tablets, electric cars etc. research into improved batteries is a very hot topic. Many modern batteries use Li+-conducting seperators or ‘membranes’ with specific conductivity, solvent swelling and heat-resistance properties.  According to this invention  improved separator membranes can be produced from (a surprisingly simple) thermoplastic polyurethane based on (preferably) 4,4′-MDI, hydroquinone bis (hydroxyethyl)ether as chain extender and a DEG-adipic polyester diol with a MW of 2000 to 3000.  Lithium conductivity can (optionally) be further improved by incorporating Li+-conducting solids like Li-Borates, Li- silicates, Li salts or complexes and the like.

Schematic Li-polymer battery.

Schematic Li-polymer battery.

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by Gerhard Bleys on May 7, 2013  •  Permalink
Posted in Elastomers
Tagged , , ,

Posted by Gerhard Bleys on May 7, 2013

https://purpatents.com/2013/05/07/solid-polyurethane-electrolyte/

Aqueous Polyurethane Dispersion with Integrated Nanoparticles

Title: AQUEOUS DISPERSIONS OF POLYURETHANE AND NANOPARTICLES

 Number/Link: WO2013/059106

Applicant/Assignee: Bayer

Publication date: 25-04-2013

“Gist”: Amino-functional inorganic nanoparticles are reacted with residual isocyanate groups of a PUD-forming polyurethane prepolymer and subsequently dispersed in water.

Why it is interesting: A water-dispersible polyurethane prepolymer is made from isocyanate, polyol and chain extender in which polyol and/or chain extender comprise ionic or potentially ionic groups.  The prepolymer is produced with a surplus of isocyanate which is subsequently reacted with amino-functional inorganic nanoparticles.  The nanoparticles consist of e.g. metal oxides which were reacted with a “bridging compound” comprising an isocyanate-reactive group (NH2 or OH) and a particle-reactive group e.g. a halogen or silane group. The polyurethane with covalently integrated nanoparticles can then be dispersed in water using a known process.  The resulting PUD has a high shelf-life and can be used in coatings, adhesives, films etc. with improved properties.

Polyurethane dispersion and film made from it. (Wikimedia)

Polyurethane dispersion and film made from it. (Wikimedia)

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by Gerhard Bleys on April 30, 2013  •  Permalink
Posted in Adhesives-Coatings, composites, dispersions, Elastomers
Tagged , ,

Posted by Gerhard Bleys on April 30, 2013

https://purpatents.com/2013/04/30/aqueous-polyurethane-dispersion-with-integrated-nanoparticles/

Polyurethane Elastomer with Greatly Improved Abrasion Resistance

Title: POLYURETHANE WITH IMPROVED ABRASION RESISTANCE, THE METHOD FOR PREPARING THE SAME AND USE THEREOF

 Number/Link: US2013059935

Applicant/Assignee: Bayer

Publication date: 7-03-2013

“Gist”: Use of polybutadiene, high in 2,3-trans butene, to improve abrasion resistance of PU elastomers

Why it is interesting: A polybutadiene (not the diol!) with a molecular weight of about 10,000 and containing 10-20% 1,2-cis butene and about 50% of 2,3-trans butene is used in an amount of up to 5% on the total formulation, resulting in a much improved abrasion resistance. It is not clear why the 2,3 trans level has to be so high – it may have to do with crystallinity and/or compatibility with the PU matrix – but no comparative examples are given. While the idea is interesting, it is not new and only a slight variation on a Dow patent of 1996: US5510054.

2,3 trans-, 1,2- and 2,3-cis butene units

2,3 cis-, 1,2- and 2,3-trans butene units

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by Gerhard Bleys on March 12, 2013  •  Permalink
Posted in Elastomers
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Posted by Gerhard Bleys on March 12, 2013

https://purpatents.com/2013/03/12/polyurethane-elastomer-with-greatly-improved-abrasion-resistance/

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