All posts tagged nano

Polyurethane-NCC Composites

Title: POLYURETHANE COMPOSITES COMPRISING NANOCRYSTALLINE CELLULOSE AND METHOD FOR IMPROVING PROPERTIES OF POLYURETHANES THEREOF

 Number/Link: WO2014/190428

Applicant/Assignee: Celluforce

Publication date: 4-12-2014

“Gist”: A small amount of nanocrystalline cellulose improves mechanical properties of polyurethanes

Why it is interesting: Nanocrystalline cellulose or NCC is cellulose in the form of nano-scale crystals or fibrils produced from woodpulp. A few years ago NCC was hailed as a disruptive new “wonder material” with the potential to replace metal and make existing plastics obsolete. The current patent application claims the use of NCC in polyurethanes, added in amounts of (preferably) less than 1% to either the polyol or isocyanate stream. Both tensile and elongation values of the PU are said to improve.  While this may well be true and NCC is no doubt an interesting material this case is most probably not patentable.  Too little, too late.

Nanocrystalline cellulose "whiskers"

Nanocrystalline cellulose “whiskers”

 

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by Gerhard Bleys on December 8, 2014  •  Permalink
Posted in composites, dispersions
Tagged , , , , , ,

Posted by Gerhard Bleys on December 8, 2014

https://purpatents.com/2014/12/08/polyurethane-ncc-composites/

Improved “Black” Insulation Foams

Title: ISOCYANATE-BASED POLYMER FOAM COMPOSITE WITH IMPROVED THERMAL INSULATION PROPERTIES

 Number/Link: US20140151593

Applicant/Assignee: Dow

Publication date: 5-06-2014 (Priority PCT/US)

“Gist”: Use of fluorinated carbon black to improve insulation value of rigid polyurethane foams

Why it is interesting: It is known that carbon black can be used to improve the insulation value of rigid foams by reducing the radiation component of the thermal conductivity. The carbon black however needs to have a very small particle size and needs to be extremely well dispersed into the reacting medium. According to the invention using a fluorinated carbon black improves the dispersion into the raw materials which, in turn, improves the final insulation value of the foam.
A small but valuable innovation.

Different grades of carbon black

Different grades of carbon black

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by Gerhard Bleys on June 18, 2014  •  Permalink
Posted in dispersions, Rigid Foams
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on June 18, 2014

https://purpatents.com/2014/06/18/improved-black-insulation-foams/

Monolithic Polyurethane Aerogels

Title: POROUS POLYURETHANE NETWORKS AND METHODS OF PREPARATION

 Number/Link: US2014/147607

Applicant/Assignee: Aerogel Technologies

Publication date: 29-05-2014

“Gist”: Monomeric tri-isocyanate and aromatic di- and triols dissolved in acetone and catalyzed by DBTDL form a gel which is supercritically dried into an aerogel.

Why it is interesting: Isocyanate-based aerogels have been reported before but because these are usually based on ‘industrial’ oligomeric raw materials like polymeric MDI and oligomeric polyols they have low mechanical properties. In the current invention, PU aerogels are prepared from monomeric tri-isocyanates (e.g. tris(isocyanatophenyl)methane) which is reacted with an aromatic triol (e.g. tris(hydroxyphenyl)ethane) and an aromatic diol (e.g.  bisphenol-A) and catalyzed by DBTDL.  The reaction takes place in anhydrous acetone which after gelation gets replaced by supercritical CO2.  The resulting nanoporous materials are high in density (200-700 kg/m3) with a compressive modulus of more than 50MPa and a thermal conductivity below 50mW/m.K .

A (silica) aerogel.

A (silica) aerogel.

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by Gerhard Bleys on June 4, 2014  •  Permalink
Posted in Rigid Foams
Tagged , , , , , ,

Posted by Gerhard Bleys on June 4, 2014

https://purpatents.com/2014/06/04/monolithic-polyurethane-aerogels/

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