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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Polyurethane Elastomers containing Polyrotaxanes

Title: CAST-MOLDED HEAT-CURABLE POLYURETHANE ELASTOMER

 Number/Link:  WO2015/159875  (Japanese)

Applicant/Assignee: UBE

Publication date: 22-10-2015

Gist”: 1-10% of a polyrotaxane is incorporated in a hot cast PU elastomer system

Why it is interesting: Polyrotaxanes are molecular systems consisting of a linear polymer which is “threated” through a number of ring-shaped molecules. The rings are prevented from ‘sliding off’ by blocking-molecules at both ends of the “thread”. In this invention polyrotaxanes based on a polycaprolactone thread and cyclodextrin rings (pref.) are incorporated in hot cast elastomer systems in amounts of 1-10% (w/w). Because cyclodextrin rings contain hydroxyl groups they react with the isocyanate incorporating the polyrotaxane in the PU polymer. The systems are said to have processing and property advantages for specific elastomer applications, in this case printer rollers – if I understand the machine translation correctly.

Schematic presentation of a polyrotaxane

Schematic presentation of a polyrotaxane

Flexible Polyurethane Foams with Improved ‘Feel’

Title: EXPANDABLE POLYURETHANE COMPOSITION AND MANUFACTURING METHOD OF FLEXIBLE POLYURETHANE FOAM

 Number/Link: US2015/0045466

Applicant/Assignee: Momentive

Publication date: 12-02-2015 (priority PCT-JP)

Gist”: Use of ester plasticizers in flexible foams

Why it is interesting: According to this invention both the humid aged compression set and the hand ‘feel’ of flexible foams can be improved by incorporating a few percent of a mono- di- tri- or tetra- ester plasticizer in the polyol. In the examples 1 to 4 php of isopropyl myristate does indeed seem to improve the humid aged compression set of an MDI-TDI foam, however not all examples are very convincing.

Isopropyl Myristate

Isopropyl myristate

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