All posts tagged bio-based materials

Natural Oil Polyols Using Metathesis Chemistry

Patent Title: METATHESIZED TRIACYLGLYCEROL POLYOLS FOR USE IN POLYURETHANE APPLICATIONS AND THEIR RELATED PROPERTIES

 Number/Link: US2015/0337073

Applicant/Assignee: Trent University

Publication date: 26-11-2015

“Gist”: Palm oil is metathesized before hydroxylation.

Why it is interesting: Natural-oil based polyols (NOPs) prepared from unsaturated plant oils are well known in the PU industry. In this case however, the oil is first modified into a ‘metathesized triacylglycerol’ by cross-metathesis using (e.g.) 1,2-butene and an appropriate catalyst. The result is a complex mixture of triglycerids, the unsaturations of which are then epoxidized and hydrolyzed into the final polyol.  In the examples palm-oil metathezised triacylglycerol (PMTAG) is compared to a commercially available soy-oil polyol when used to perpare both flexible and rigid foams. While the chemistry is interesting there does not appear to be much advantage to this type of NOP.

Metathesis reaction of triolein with butene

Metathesis reaction of triolein with butene

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by Gerhard Bleys on November 27, 2015  •  Permalink
Posted in Polyols
Tagged , , , , , , ,

Posted by Gerhard Bleys on November 27, 2015

https://purpatents.com/2015/11/27/natural-oil-polyols-using-metathesis-chemistry/

PLA-PPG-PU Block Copolymers

Title: LACTIDE COPOLYMER, METHOD FOR PREPARING SAME, AND RESIN COMPOSITION COMPRISING SAME

 Number/Link:US2015/0284516

Applicant/Assignee: LG Chem

Publication date: 8-10-2015 (Priority PCT/KR)

“Gist”: Polyether-polylactide block copolymers are prepared using ROP and then extended with isocyanates

Why it is interesting: Polylactic acid (PLA) is a well known renewable and biodegradable polymer often used in the form of films or sheets for disposable packaging. The polymer is however not very flexible and the films have poor mechanical properties. According to this invention both flexibility and mechanical properties can be greatly improved by making polyether-polylactide copolymers and then extending these using an isocyanate with a functionality of more than 2. The copolymers are made by ring-opening polymerization of lactide monomer using a polyether diol as a ‘macro’ initiator together with a specific catalyst. In the examples an excess L-lactide monomer is used which is reacted with a 4000 to 6000 mole weight polypropylene glycol, resulting in a block copolymer with a Mw of more than 100,000.  The block copolymer is then reacted with a mixture of MDI and hexamethylenediisocyanate isocyanurate, after which the residual lactide is removed.

L-Lactide

L-Lactide

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by Gerhard Bleys on October 9, 2015  •  Permalink
Posted in Elastomers
Tagged , , , , ,

Posted by Gerhard Bleys on October 9, 2015

https://purpatents.com/2015/10/09/pla-pe-pu-block-copolymers/

Insulating Wood-Aerogel Composites

Title: REINFORCED ORGANIC NATURAL FIBER COMPOSITES

 Number/Link: WO2015/144267

Applicant/Assignee: Huntsman

Publication date: 1-10-2015

“Gist”: Aerogel particles are incorporated in composite wood boards

Why it is interesting: Composite wood products (OSB, MDF..) are  well known and popular construction materials which are produced by compressing wood fibers (or flakes and the like) together with a binder like e.g. a polymeric MDI. Typically these materials show thermal conductivity values of about 50 mW/m.K at densities of around 200 kg/m³.  According to this invention these insulation values can be significantly improved by incorporating (a large amount of) hydrophobic nanoporous particles and binding the composite with an in-water emulsified isocyanate. In the examples silica aerogel particles and wood fibers are mixed an bonded with an emulsifiable MDI. The amount of particles ranges from about 25 to 50% (w/w) resulting in composites with densities below 200 kg/m³ and insulation values of about 20 to 30 mW/mK.

Medium density fibreboard (MDF).

Medium density fibreboard (MDF).

3 Comments
by Gerhard Bleys on October 2, 2015  •  Permalink
Posted in Adhesives-Coatings, composites
Tagged , , , , , , , , , , , , ,

Posted by Gerhard Bleys on October 2, 2015

https://purpatents.com/2015/10/02/insulating-wood-aerogel-composites/

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