All posts in category Elastomers

Sulfur Containing Polyurethane Elastomers for Tires and “Tweels”

Title: Polyurethane

 Number/Link: US2013/0287982

Applicant/Assignee: Michelin

Publication date: 31-10-2013  (priority PCT/FR)

“Gist”: Use of dithiodiols or dithiodiamines in polyurethane elastomer formulations for improved adhesion to metal.

Why it is interesting: The current invention relates to polyurethane elastomers containing a chain extender mixture consisting of a conventional chain extender (e.g. butandiol) and 1-30% (of the total chain extender) of an S-S bridge containing diol or diamine like 2,2′-dithiodiethanol or 4,4′-dithiodianiline. The resulting polyurethane reportedly shows an increased bonding strength  to metal, which can be even more enhanced by adding elemental sulfur and conventional sulfur-containing rubber-curing accelerators like dithiocarbamates, thiurams, thiazoles etc. (as well known in the art of rubber vulcanization). The resulting polyurethanes are useful for the production of metal strand-reinforced composites like tires and ‘tweels’ (tweel=tire+wheel  see http://michelintweel.com/index.html).

Michelin "tweel"

Michelin “tweel”

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by Gerhard Bleys on November 5, 2013  •  Permalink
Posted in Elastomers
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Posted by Gerhard Bleys on November 5, 2013

https://purpatents.com/2013/11/05/sulfur-containing-polyurethane-elastomers-for-tires-and-tweels/

Very Tough Polyurethane Elastomers Based on a Novel Type of Polyester Polyol

Title: POLYESTER POLYOL FOR USE IN POLYURETHANE

 Number/Link: WO2013/156450

Applicant/Assignee: Purac Biochem

Publication date: 24-10-2013

“Gist”: Tough polyurethane elastomers can be prepared from polyester polyols based on dimer acid and lactide oligomers.

Why it is interesting: The invention claims a new type of ABA polyester polyol where A is a hydrophilic lactide oligomer and B is a hydrophobic dimer diacid initiator. The lactide ologimers can be produced by ring-opening polymerization of cyclic lactide and preferably contain between 4 and 16 lactoyl units.  The dimer diacid is prepared by dimerizing unsaturated C12 to C22 fatty acids, preferably linoleic or linolenic acid. The molecular weight of the polyester polyol is preferably between 1000 and 3500 dalton. Solid polyurethane elastomers prepared from this type of polyols reportedly have much improved toughness and other mechanical properties.

Example of a Dimer Acid

Example of a Dimer Acid

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by Gerhard Bleys on October 29, 2013  •  Permalink
Posted in Elastomers
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Posted by Gerhard Bleys on October 29, 2013

https://purpatents.com/2013/10/29/very-tough-polyurethane-elastomers-based-on-a-novel-type-of-polyester-polyol/

Polyurethane Elastomers with High Abrasion Resistance

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

 Number/Link: US2013/0274365

Applicant/Assignee: Bayer

Publication date: 17-10-2013 (priority PCT/DE)

“Gist”: Small amounts of polyisoprene improve abrasion resistance of elastomers

Why it is interesting: It is known that polyether polyols have advantages over polyester polyols for the production of polyurethane elastomers: the resulting elastomers have better low temperature properties, better hydroslysis resistance and antimicrobial properties, however the mechanical properties as well as the abrasion resistance are lower. According to this invention the abrasion resistance of polyether elastomers can be greatly improved by incorporating a small amount of polyisoprene in the formulation. In the examples 2% polyisoprene with a MW of 28,000 or 45,000 is used in a formulation of polyether polyol, butanediol, water and catalyst together with a non-disclosed isocyanate. The resulting elastomers have a density of 600 kg/m3 and show a markedly improved abrasion resistance.

Structural units present in polyisoprene

Structural units present in polyisoprene

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

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

https://purpatents.com/2013/10/22/polyurethane-elastomers-with-high-abrasion-resistance/

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