All posts tagged dispersions

Hydrophilic PU Foams from Sulfonated Polyols

Patent Title: HYDROPHILIC OPEN CELL FOAMS

 Number/Link: WO2016/044512

Applicant/Assignee: 3M

Publication date: 24-03-2016

“Gist”: Use of sulfonated polyols to make hydrophilic foams

Why it is interesting: Hydrophilic polyurethane foams are well known and often made using polyols with a high ethyleneoxide content.  According to this invention, open celled, hydrophilic foams can be made using a polyol blend containing polyols (or polyamines) having charged functional groups. In the examples a polymeric MDI is reacted with a polyol blend of a 3000MW, 8% EO, triol with up to 40% (w/w) of a sulfonated diol. The sulfonated diol is prepared by reacting 0.25 moles of  dimethyl sodium 5-sulfoisophthalate with 1 mole of PEG 600. The foams have properties useful for use as household sponges.

Dimethyl sodium 5-sulfoisophthalate

Dimethyl sodium 5-sulfoisophthalate

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by Gerhard Bleys on April 1, 2016  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , , ,

Posted by Gerhard Bleys on April 1, 2016

https://purpatents.com/2016/04/01/hydrophilic-pu-foams-from-sulfonated-polyols/

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/

1K Dual Cure Polyurethane Adhesive

Patent Title: DUAL CURE 1K PU ADHESIVE FORMULATIONS USING MATRIX ENCAPSULATED POLYAMINES

 Number/Link: W02016022346

Applicant/Assignee: Dow

Publication date: 11-02-2016

“Gist”: Encapsulated polyamines are added to a moisture curing adhesive

Why it is interesting: One component (1K) PU adhesives are either NCO-ended prepolymers cured by atmospheric moisture, or OH-ended prepolymers containing encapuslated or blocked isocyanates and which are cured by heat.  According to this invention a 1K adhesive curable by both moisture and heat can be made by incorporating an encapuslated polyamine into a 1K mositure curing prepolymer. The amine is solid at room temperature (e.g. 1,12-dodecanediamine) and is mixed with a (semi-)crystalline termoplastic with a well defined melting point, e.g. a polyacrylate or polyolefine before being added to the adhesive. Dual cure 1K adhesives allow for heat-curing the adhesive at critical spots to providing stability to an assembly.  The adhesives are said to be especially useful for the automotive industry.

1,12-dodecanediamine

1,12-dodecanediamine

 

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by Gerhard Bleys on February 12, 2016  •  Permalink
Posted in Adhesives-Coatings
Tagged , , , , , , , ,

Posted by Gerhard Bleys on February 12, 2016

https://purpatents.com/2016/02/12/1k-dual-cure-polyurethane-adhesive/

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