All posts tagged catalysts

Polyols from Proteins

Patent Title: POLYOLS FROM PROTEIN BIOMASS

 Number/Link: WO2016/094859

Applicant/Assignee: Inventors

Publication date: 16-06-2016

“Gist”: Transamidation of protein with diamines followed by carbonation

Why it is interesting: Currently most renewable polyols are based on natural oils (NOPs) like soy-oil, but it is also possible to make polyols from proteins. According to this invention this can be accomplished by first cleaving the protein amide bonds by transamidation with an excess of low molecular weight polyamines using a boric acid derivative as catalyst. Then stripping the excess amines and reacting with cyclocarbonates. In an example soy-meal is reacted with ethylenediamine and then with ethylene carbonate resulting in a urethane polyol. The polyols have a high primary OH content, are auto-catalytic and are said to be useful for the production of PU resins and rigid foams.

Diol acoording to the invention. R is an amino acid residue.

Polyol according to the invention. R is an amino acid residue.

 

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by Gerhard Bleys on June 20, 2016  •  Permalink
Posted in Polyols
Tagged , , , , , , , ,

Posted by Gerhard Bleys on June 20, 2016

https://purpatents.com/2016/06/20/polyols-from-proteins/

TPU from POM-Polyether Polyols

Title: THERMOPLASTIC POLYURETHANES, PRODUCTION AND USE THEREOF

 Number/Link: WO2015/155084  (German)

Applicant/Assignee: Bayer

Publication date: 15-10-2015

“Gist”: Paraformaldehyde-PO polyols are used to make TPU

Why it is interesting: Polyoxymethylene (POM) is a highly crystalline ‘engineering thermoplastic’ often used in blends together with TPU. In this invention POM is not blended but used to make a POM-polyether ‘block’ diol which is then used to make TPU. The diol is prepared by using paraformaldehyde as a starter which is reacted with PO (and optionally CO2) using DMC catalysis. The POM-block acts as a ‘hard block’ and use of the diol allows for an improved control of Tg, melt viscosity, hardness, chemical resistance etc. of the TPU.  In the examples TPU is made from a 2000 MW parafomaldehyde/PO-CO2 block copolymer  together with 4,4’MDI and BDO.

Paraformaldehyde

Paraformaldehyde

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by Gerhard Bleys on October 16, 2015  •  Permalink
Posted in Polyols, Thermoplastics
Tagged , , , , , , , , , , , , ,

Posted by Gerhard Bleys on October 16, 2015

https://purpatents.com/2015/10/16/tpu-from-pom-polyether-polyols/

PU Sealants using Michael Addition Chemistry

Title: MICHAEL ACCEPTOR-TERMINATED URETHANE-CONTAINING FUEL RESISTANT PREPOLYMERS AND COMPOSITIONS THEREOF

 Number/Link: US2015/0252232

Applicant/Assignee: PRC-DeSoto

Publication date: 10-09-2015

“Gist”: A PU prepolymer is capped with Michael accepting groups and then cured with a dithiol

Why it is interesting: This invention is about sulphur containing PU sealants with properties acceptable for the aerospace industry. A bis(vinylsulfonyl)- terminated urethane-polythioether prepolymer is prepared according to the scheme below. The prepolymer can then be cured with a dithiol-ended polyether, catalysed by a tertiary amine.  The compositions have an extended pot life and the curing rate can be controlled by using an encapsulated tert-amine as a controlled-release catalyst.

Michael acceptor-terminated prepolymer preparation according to the invention

Michael acceptor-terminated prepolymer preparation according to the invention

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by Gerhard Bleys on September 11, 2015  •  Permalink
Posted in Adhesives-Coatings, Isocyanates and Prepolymers
Tagged , , , , , ,

Posted by Gerhard Bleys on September 11, 2015

https://purpatents.com/2015/09/11/pu-sealants-using-michael-addition-chemistry/

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