Polyurethane-Graphene Composite

Patent Title: POLYURETHANE FILM COMPRISING GRAPHENE AND PREPARATION PROCESS THEREOF.

 Number/Link: WO/2018/202747

Applicant/Assignee:  Directa Plus

Publication date: 8 November 2018

Gist”: A PU film containing graphene nano-platelets

Why it is interesting: The invention is about polyurethane-graphene nanocomposites useful as films in textiles for clothing and medical applications. The films are prepared by incorporating into a (commercially available) PU resin, 1-30% (w/w) of graphene nano platelets together with 0.1-5% of (pref.) silica particles as a blocking agent and a solvent to adjust viscosity.  The composition is cured on a flat support as a film of 10 to 100µm thick. It is said that the PU films can a.o. have improved breathability, thermal conductivity, electrical conductivity and antibacterial activity.

Graphene

Graphene (Wikipedia)

 

 

Superhydrophilic Polyurethane Coatings

Patent Title: HYDROPHILIC ANTI-FOG COATINGS

 Number/Link: US2015/0344725

Applicant/Assignee: InnoSense

Publication date: 3-12-2015

Gist”: A hydrophilic anti-fog coating is pepared by incorporating silica particles  and organosilicate micelles

Why it is interesting: A superhydrophilic coating composition is made from a polyurethane prepolymer together with 1-5% (w/w) of a ~30nm monodisperse colloidal silica and up to 10% (v/v) of organosilicate micelles having a hydrophilic porous ‘shell’ and a (pref.) hydrophilic ‘core’, all in a solvent. The composition is said to be especially useful for anti-fog coatings on optically-clear plastic substrates (polycarbonate, polyurethane, polyester..).  According to the theory the porous shell of the micelles draws water away from the coated surface while the micelle cores act as a water reservoir.  Very clever.

Superhydrophilic coating accordin to the invention

Superhydrophilic coating according to the invention

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