All posts tagged composites

Particle-Reinforced Thermoplastic Polyurethane

Title: COMPOSITION AND ARTICLE COMPRISING THERMOPLASTIC POLYURETHANE AND PARTICULATE ENGINEERING POLYMER

 Number/Link: WO2015/031292

Applicant/Assignee: SABIC

Publication date: 5-03-2015

“Gist”: TPU is reinforced with ultrafine particles made from engineering thermoplastics having a melting point of over 200°C.

Why it is interesting: Particulate polyarylsulfone, polyimide, poly(phenylene sulfide) or polyamide, with a melting point or glass transition higher than 200°C and average particle size between 5 and 200 μm, is melt-blended with TPU at a temperature below 200°C and in an amount of 10-30% (w/w).  Alternatively the particles could be mixed (“slurried”) with the polyol and/or isocyanate used to produce the TPU.  The resulting composite is said to have increased hardness, tensile strength and heat resistance.
Sabic is becoming quite active in polyurethane innovation and is apparently looking for synergies with its engineering thermoplastics business.

Poly (1,4-phenylene sulfide) (PPS)

Poly (1,4-phenylene sulfide) (PPS)

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by Gerhard Bleys on March 6, 2015  •  Permalink
Posted in composites, dispersions, Thermoplastics
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on March 6, 2015

https://purpatents.com/2015/03/06/particle-reinforced-thermoplastic-polyurethane/

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/

Classic PU Patent of the Month: Upjohn’s “Isoplast®” (1981)

Title: Polyurethane prepared by reaction of an organic polyisocyanate, a chain extender and an isocyanate-reactive material of m.w. 500-20,000 characterized by the use of only 2-25 percent by weight of the latter material

 Number/Link: US4376834

Applicant/Assignee: Upjohn

Publication date: 15-03-1983

“Gist”: Very high hardblock TPU from MDI and chain extenders.

Why it is interesting: “Isoplast” is a so-called engineering thermoplastic useful in niche applications where high impact strength and high chemical resistance are required. The material can be clear or reinforced and can also be used in fiber-reinforced composites.  Currently the trademark is owned by Lubrizol who acquired it from Dow who in turn bought it from Upjohn in the 1980s.  Isoplast is made from 4,4′ MDI and a mixture of chain extenders selected from MEG,DEG, neopentyl glycol, 1,4-cyclohexanedimethanol etc. The choice of chain extenders controls the crystallinity/glassiness of the polymer.  A few percent of high mole weight polyol may be added to improve impact resistance. A very interesting material with interesting melt-flow characteristics because of its depolymerization and repolymerization behaviour during processing.

Screw from reinforced Isoplast

Screw from reinforced Isoplast

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by Gerhard Bleys on May 23, 2014  •  Permalink
Posted in Classic PU Patent of the month, Thermoplastics
Tagged , , , , , , , ,

Posted by Gerhard Bleys on May 23, 2014

https://purpatents.com/2014/05/23/classic-pu-patent-of-the-month-upjohns-isoplast-1981/

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