All posts in category dispersions

PPE-Filled Rigid Foams

Title: RIGID FOAM AND ASSOCIATED ARTICLE AND METHOD

 Number/Link: WO2015/012989

Applicant/Assignee: SABIC

Publication date: 29-01-2015

“Gist”: Rigid polyurethane foams containing polyphenylene ether particles

Why it is interesting: This invention is about rigid PU or PIR (polyisocyanurate) foams containing up to 25% w/w on the total composition of poly(2,6-dimethyl-1,4-phenylenether) particles.  The particles have a mean particle size of about 6 µm and are prepared by jet milling a commercial grade of PPE powder. The resulting foams are said to have reduced flammability and water absorption.  This is the second patent application that SABIC files on PPE-PU hybrids or combinations.  An interesting development but it is hard to believe that these ideas are practical and economical.

poly(2,6-dimethyl-1,4-phenyleneether)

poly(2,6-dimethyl-1,4-phenylene ether)

Leave a comment
by Gerhard Bleys on January 30, 2015  •  Permalink
Posted in dispersions, Rigid Foams
Tagged , , , , , , , ,

Posted by Gerhard Bleys on January 30, 2015

https://purpatents.com/2015/01/30/ppe-filled-rigid-foams/

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”

 

Leave a comment
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/

Flexible Foams with Enlarged Cell Size

Title: PUR FOAM WITH ENLARGED CELL STRUCTURE

 Number/Link: WO2014/170198 (German)

Applicant/Assignee: Evonik

Publication date: 23-10-2014

“Gist”: The cell size of PU flexible foam is enlarged by using microcrystalline wax.

Why it is interesting: Enlarging the cell size of flexible foams can improve comfort properties by enhancing ‘breathabibility’, that is by enhancing airflow and moisture- and heat transport.  According to this invention the cell size of flex foams can be increased without affecting foam density or hardness by using a specific type of wax.  The wax (preferably) is a microcrystalline wax (as opposed to a paraffinic wax) with a congealing temperature of between 60 and 75°C.  The wax is used as a dispersion in a solvent (e.g. a sorbitan ester)  in an amount of about 0.05 to 2.0 php.

Cell structure of a flexible polyurethane foam.

Cell structure of a flexible polyurethane foam.

Leave a comment
by Gerhard Bleys on October 28, 2014  •  Permalink
Posted in dispersions, Flexible Foams
Tagged , , , , , , , ,

Posted by Gerhard Bleys on October 28, 2014

https://purpatents.com/2014/10/28/flexible-foams-with-enlarged-cell-size/

« Older Posts
Newer Posts »

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 259 other subscribers

  • Follow Innovation in PU on Twitter