All posts tagged rubber

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

Flexible Foams with Improved Thermal Comfort

Title: IN-SITU GELATINOUS TRIBLOCK COPOLYMER ELASTOMERS IN POLYURETHANE FLEXIBLE FOAMS

Number/Link:US2015/0166756

Applicant/Assignee: Peterson Chemical Technology

Publication date: 18-06-2015

“Gist”: Gelatinous styrenic block copolymers are incorporated in flexible foams to increase thermal conductivity.

Why it is interesting: High viscosity styrenic triblock copolymer resins (like SBS, SEBS, SIS etc), plasticized with mineral oils, are added to flexible foam-forming compositions. The heat of the foam-forming reaction is said to be sufficient to further polymerize the resins and melt the styrene-block such that the block copolymers get integrated into the polyurethane matrix. The resulting foams show increased load bearing and improved thermal conductivity. These systems could improve the thermal comfort properties of cushioning materials, especially those of viscoelastic foams.

Poly(styrene-butadiene-styrene) or SBS.

Polyols from Epoxies and Cardanol

Title: CARDANOL MODIFIED EPOXY POLYOL

Number/Link: WO2015/077944 WO2015/077945 WO2015/078178

Applicant/Assignee: Dow

Publication date: 4-06-2015

“Gist”: Polyols are prepared by reacting an epoxy resin with cashew nutshell liquid.

Why it is interesting: Cardanol is the main component of cashew nutshell liquid which is a by-product of cashew nut processing. It is a “surfactant-like” phenolic compound which, when reacted with a polyepoxide, will result in a polyol with sec-OH groups. When used in polyurethane formulations these polyols will (unsurprisingly) be slow-reacting, highly hydrophobic and show compatibilizing properties vs apolar compounds. Dow have therefore filed three patent applications on PU systems containing these polyols: one on slowly-reacting PU systems for filament winding, one on highly hydrophobic PU elastomers and one on asphalt-PU compositions.
These are interesting polyols but they could be hard to process in my opinion.

Cardanol is reacted with bisphenol-A diglycidylether resulting in a diol according to the invention

Innovation in Polyurethanes

All posts tagged rubber

Carbon-Black Reinforced Polyurethane Tires

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Flexible Foams with Improved Thermal Comfort

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Polyols from Epoxies and Cardanol

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