All posts in category Elastomers

Toughened Thermoplastic Polyurethane

Title: Method Of Toughening Thermoplastic Polyurethane And Articles Comprising Toughened Thermoplastic Polyurethane

 Number/Link: US2013/0323512

Applicant/Assignee: Nike

Publication date: 5-12-2013

“Gist”: TPU is interpenetrated with a thermosetting PU using a solvent

Why it is interesting: According to this invention a conventional TPU can be “toughened” by dipping and  swelling it in a solution containing (about) 20% of a PU-forming composition comprising a polyester polyol, a chain extender, a mixture of pure and polymeric MDI and DBTDL as a catalyst.  The solvent is preferably acetone. The swollen TPU is dried and the PU is cured by heating. It is believed that a TPU-PU interpenetrating polymer network (IPN) is formed.  The invention is targeted at improving the scuff resistance of golf balls. (scuff resistance=resistance against failure of the coating by shear stress).

Nike golf ball.

Nike golf ball.

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by Gerhard Bleys on December 10, 2013  •  Permalink
Posted in Elastomers, Thermoplastics
Tagged , , , , ,

Posted by Gerhard Bleys on December 10, 2013

https://purpatents.com/2013/12/10/toughened-thermoplastic-polyurethane/

Solid Cast Polyurethane Elastomers Produced with a Highly Specific “Switchable” Catalyst

Title: POLYISOCYANATE POLYADDITION PRODUCTS, A PROCESS FOR PREPARATION THEREOF AND USE THEREOF

 Number/Link: US2013/303720

Applicant/Assignee: Bayer

Publication date: 14-11-2013 (priority PCT/DE)

“Gist”: Use of specific acid-bocked amidines as thermo-latent catalysts for cast elastomers.

Why it is interesting: For the production of solid (non-foamed) cast elastomers it is advantageous to use catalysts which specifically promote the NCO – OH reaction and as little as possible side reactions such as NCO – water, dimerization, trimerization, allophanatization etc. It is also advantageous that the catalyst can be ‘switched on’ at a certain temperature so that elastomer systems with a long open time and short cure time can be formulated. According to the current invention this can be accomplished by using an acid blocked amidine, pref. 1,8-diazabicyclo[5.4.0]undec-7ene (DBU) blocked with (pref.) isocrotonic acid (Z-2-butenoic acid), together with a zeolite as water scavenger. The system has the added advantage that no heavy metals are used.

1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)

1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)

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by Gerhard Bleys on November 22, 2013  •  Permalink
Posted in Elastomers
Tagged , , , ,

Posted by Gerhard Bleys on November 22, 2013

https://purpatents.com/2013/11/22/solid-cast-polyurethane-elastomers-produced-with-a-highly-specific-switchable-catalyst/

Flexible Foams containing Polyurethane Phase Change Gels

Title: Polyurethane Gel-Like Polymers, Methods and Use in Flexible Foams  

 Number/Link: US2013/0296449

Applicant/Assignee: PETERSON CHEMICAL TECHNOLOGY

Publication date: 07-11-2013

“Gist”:   “Polyurethane phase change gels” prepared from polyurethane gels and conventional PCMs are incorporated into polyurethane or latex flexible foams to improve thermal comfort.

Why it is interesting: This application is closely related to the application discussed in the previous post but instead of a plasticized styrenic triblock copolymer, now a polyurethane gel is used. The PU gel is produced from conventional raw materials at low NCO-index (about 60%) together with plasticizers.

A Polyurethane Gel

A Polyurethane Gel

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by Gerhard Bleys on November 14, 2013  •  Permalink
Posted in Elastomers, Flexible Foams
Tagged , , , , , , , , , , , , , , , , , , , ,

Posted by Gerhard Bleys on November 14, 2013

https://purpatents.com/2013/11/14/flexible-foams-containing-polyurethane-phase-change-gels/

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