Hybrid Polyurethane-Peptide Dispersion

Patent Title: AQUEOUS PEPTIDE-STABILIZED POLYURETHANE DISPERSIONS

 Number/Link: W02016058909

Applicant/Assignee: Henkel; Max Planck Ges.

Publication date: 21-04-2016

Gist”: An NCO-ended prepolymer is reacted with a peptide mixture in water at correct pH

Why it is interesting: According to this invention a low-VOC, surfactant- free, stable dispersion can be prepared by reacting an isocyanate-ended preopolymer with an aqueous solution of peptides. The prepolymer is prepared from a polyether-, polyester- or PDMS diol and a surplus of (preferably) aliphatic isocyanate. The peptide mixture is obtained by hydrolysis or enzymatic cleaving of naturally occuring proteins and is dispersed in water at a pH well above the highest isoelectric point present in the mixture. This will ensure reaction of the isocyanate with the peptides instead of water.
Polymer-protein hybrids are interesting because they allow for unique properties not attainable with synthetic polymers alone, such as a selective and specific interaction with other biomolecules and a controlled response to external stimuli like pH and temperature.

Example of a tetrapeptide: Val-Gly-Ser-Ala. (Wikipedia)

Example of a tetrapeptide: Val-Gly-Ser-Ala. (Wikipedia)

 

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Renewable Polyols from “Distillers Grains”

Title: PRODUCTION OF POLYOLS USING DISTILLERS GRAINS AND PROTEINS AND LIGNIN EXTRACTED FROM DISTILLERS GRAINS

 Number/Link: US2014/200324

Applicant/Assignee: EMGPI PROC and PITTSBURG STATE UNIVERSITY 

Publication date: 17-07-2014

Gist”: Dried distillers grains are transamidated and then alkoxylated to form a polyol useful for rigid polyurethane spray foams.

Why it is interesting: ‘Distillers grains’ are a by-product of ethanol production and are currently avaible in huge quatities due to the state-sponsored bio-ethanol production in the US.  Most of the product is used as animal feeds because of the high levels of nutrients. Dried distillers grain (DDGS) contains about 30% protein, about 30% fibers (cellulose, hemicellulose and lignin) and about 30% lipids, ash and water. According to this invention DDGS can be turned into polyols by first reacting the (solid) DDGS with diethanolamine at elevated temperature and pressure (about 200°C and 3.5 MPa) and breaking down the proteins in amino-amides. The resulting liquid can subsequentlly be epoxidized with propylene oxide resulting in a polyol which is supposedly highly reactive and useful for polyurethane rigid spray foams.
Personally I find it hard to believe that a decent reproducible foam can be made with such a horrible mixture.

Transamidation of protein with subsequent epoxidation.

Transamidation of protein with subsequent epoxidation.

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