All posts tagged dispersions

Polyurethane-Acrylate Plastisol

Patent Title: ACRYLIC-URETHANE IPN PLASTISOL

Number/Link: US2016/0152857

Applicant/Assignee: Polyone

Publication date: 2-06-2016

“Gist”: Plastisols from blocked-iso grafted acrylate in plasticizer

Why it is interesting:
Conventional plastisols are suspensions of PVC particles in a (usuallly phthalate-) plasticizer. The suspension can be cured by heating, which results in a plasticized elastomer. Plastisols are used for coatings of e.g. car underbodies and for ‘screen printing’ of textiles. According to this invention a non-PVC plastisol can be produced by dispersing core-shell acrylate polymer particles (Mn between 300,000 and 1,000,000) with blocked isocyanate groups grafted to the backbone into a plasticizer, preferably into dioctylphthalate, together with a latent amine crosslinker like adipic dihydrazide. No information is given about the blocking agent but the plastisol is said to cure at 130-170°C and be especially suited for textile printing.

Adipic dihydrazide

Polyurethane-Epoxy IPN Composites

Patent Title: POLYMER COMPOSITE THERMAL INTERFACE MATERIAL WITH HIGH THERMAL CONDUCTIVITY

Number/Link: WO2016/079627

Applicant/Assignee: IBM

Publication date: 26-05-2016

“Gist”: PU-Epoxy IPN particle composites show improved thermal conductivity

Why it is interesting: The application is about thermally conductive adhesives for use with electronic components. Commonly these materials consist of polymers filled with thermally- (but not electrically-) conductive particles such as AlN, BN and ZnO. According to the invention the thermal conductivity of these composites can be improved by using a polyurethane-epoxy true interpenetrating polymer network (IPN) as the matrix. In the examples a MDI-polycaprolactone prepolymer is mixed with a BPA diglycidylether prepolymer and boron nitride (BN) particles and crosslinked using trimethylolpropane and imidazole. The thermal conductivity of the composite shows a synergy, meaning that it is clearly higher than the conductivities of both the PU or EP composites. The synergy is said to be due to an enhanced distribution of the BN particles and (because this is IBM and they are very clever) due to enhanced phonon scattering.

Bisphenol-A diglycidylether

1 Comment

by Gerhard Bleys on May 30, 2016 • Permalink

Posted in Adhesives-Coatings

Tagged blend, composites, dispersions, electronics, epoxy, fillers, hybrid, IPN, pot life, prepolymer

Posted by Gerhard Bleys on May 30, 2016

https://purpatents.com/2016/05/30/polyurethane-epoxy-ipn-composites/

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)

Innovation in Polyurethanes

All posts tagged dispersions

Polyurethane-Acrylate Plastisol

Polyurethane-Epoxy IPN Composites

Hybrid Polyurethane-Peptide Dispersion

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