All posts tagged elastomers

Carbon-Black Reinforced Polyurethane Tires

Patent Title: TIRE WITH CARBON BLACK REINFORCED POLYURETHANE 

 Number/Link: US20160060420

Applicant/Assignee: Goodyear

Publication date: 3-03-2016

“Gist”: Dried, pulverized C-black is used in cast elastomer

Why it is interesting: According to this invention cast polyurethanes with properties useful for tire production can be made by incorporating 2-4% (w/w) of carbon black, pulverized to an average particle size of 5-10 μm. The carbon black is dispersed in the polyol component together with molecular sieves to absorb the water inherently present in carbon black.  It is said that removing the water allows the carbon black to react with an excess of isocyanate present, thereby greatly improving its reinforcing characteristics. Although not mentioned in the text I assume that the tires are intended for low-speed vehicles only.

GoodYear Tire

GoodYear Tire

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by Gerhard Bleys on March 4, 2016  •  Permalink
Posted in composites, dispersions, Elastomers
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on March 4, 2016

https://purpatents.com/2016/03/04/carbon-black-reinforced-polyurethane-tires/

Polyurethane Elastomers from Modified Polybutadienols

Patent Title: POLYESTER-MODIFIED POLYBUTADIENOLS FOR PRODUCING POLYURETHANE ELASTOMERS AND THERMOPLASTIC POLYURETHANES

 Number/Link: WO2016/026807  (German)

Applicant/Assignee: BASF

Publication date: 25-02-2016

“Gist”: Polybutadiene polyols are capped with caprolactone

Why it is interesting: Liquid hydroxy-terminated polybutadienes have been available for quite a while and their use in polyurethane elastomers and TPUs is known.  However, because of their immiscibility with isocyanates, polyols and most chain extenders they are notoriously difficult to process, resulting in elastomers that often show poor or inconsistent properties. According to this invention the problem can be solved by capping the polybutadienols with a few moles of cyclic ester, preferably with ε-caprolactone. The capped polyols are miscible with e.g. MDI and butanediol and the resulting elastomers show much improved properties compared to both polybutanedienol- and polycaprolactone- based elastomers.

Caprolactone

Epsilon-caprolactone

ε

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by Gerhard Bleys on February 26, 2016  •  Permalink
Posted in Elastomers, Polyols, Thermoplastics
Tagged , , , , ,

Posted by Gerhard Bleys on February 26, 2016

https://purpatents.com/2016/02/26/polyurethane-elastomers-from-modified-polybutadienols/

Spirocyclic Chain Extenders in TPU

Patent Title: THERMOPLASTIC POLYURETHANE WITH HIGH HEAT RESISTANCE

 Number/Link: W02016025421  WO2016025423

Applicant/Assignee: Lubrizol

Publication date: 18-02-2016

“Gist”: Use of spirocyclic chain extenders increases heat resistance of TPU

Why it is interesting: Both these patent applications are about the use of alkylene-substituted spirocyclic diols to improve the heat resistance of thermoplastic polyurethanes. In the WO..21 case the diol is used together with MDI and a polycarbonate diol resulting in high heat resistance TPU useful e.g for cable and wire coatings.  In the WO..23 case the spirocyclic diol is used together with MDI and a polyether polyol (PEGs) resulting in TPU with high heat resistance and moisture vapour transmission.  The spirocyclic diol used in the examples is 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane.

3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane

3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane

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by Gerhard Bleys on February 19, 2016  •  Permalink
Posted in Polyols, Thermoplastics
Tagged , , , , , , , , , , ,

Posted by Gerhard Bleys on February 19, 2016

https://purpatents.com/2016/02/19/spirocyclic-chain-extenders-in-tpu/

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