Fingerprint Resistant Coatings

Patent Title: COATINGS COMBINING OIL-ABSORBING AND OIL-REPELLING COMPONENTS FOR INCREASED SMUDGE RESISTANCE

 Number/Link: WO2018/031356

Applicant/Assignee:  HRL Laboratories

Publication date: 15 February 2018

Gist”: Phase separated polyurethanes with oleophilic dispersed phase and oleophobic continuous phase (or vice versa) behave as anti-smudge materials.

Why it is interesting: Anti-smudge coatings are of great interest for smartphones and other touch screen devices and are currently made from oleophobic materials, i.e. materials showing a small contact angle vs. oils. According to this invention improved anti-smudge properties can be achieved by using a material having discrete inclusions in a continuous matrix. The matrix material needs to be oleophilic, while the inclusions are oleophobic (or vice versa) and the inclusions need to be smaller than 50nm so not to scatter visible light.  A coating like this can be prepared from a segmented polyurethane comprising (e.g.) a polybutadiene soft phase and a perfluoro/isocyanate/TMP hard phase. It is said that the oleophobic phase will repel the oil while the oleophilic phase will absorb it, leaving a smudge-free surface.
Question remains what happens when the oily phase gets saturated..

smudgecoating

Schematic representation of the invention

Modified Polyols for Improved PU Adhesives

Title: POLYOL COMPOSITIONS FOR HOT MELT ADHESIVES

 Number/Link:WO2015/127276

Applicant/Assignee: IFS Industries

Publication date: 27-08-2015

Gist”: Polyester diols are partially capped with bulky glycidyl esters

Why it is interesting: According to this invention polyester (or polyether) polyols which are partially capped with a bulky glycidyl ester can be used to improve the adhesive properties of (reactive) polyurethane (hotmelt) adhesives. Specifically the adhesion to materials with low surface energies like ABS or polyolefines is said to improve. In the examples polyester diols prepared from adipic acid and hexanediol with a Mn of about 3000 are partially capped with the glycidyl ester of neodecanoic acid (“Versatic Acid 10”) and used in PU adhesive formulations.

Glycidyl ester of neodecanoic acid

Glycidyl ester of neodecanoic acid

Hydrophobic Coatings from BO Polyols

Title: POLYURETHANE ENCAPSULATE

 Number/Link: WO2014/176390

Applicant/Assignee: Dow

Publication date: 30-10-2014

Gist”: Use of polybutyleneoxide polyols for hydrophobic encapsulants.

Why it is interesting: The encapsulation of water soluble compounds for controlled release, like e.g. plant nutrients and fertilizers, requires a relatively hydrophobic coating.  Often this is accomplished with polyurethane coatings to which hydrophic compounds are added such as castor oil derivatives. These additives can however have a deleterious effect on other coating properties.  According to this invention encapsulation coatings with good mechanical properties and improved water absorption and water vapour transmission properties can be prepared from polybutyleneoxide triols and polymeric MDI without the need for other additives.

Butylene oxide

Butylene oxide