Omniphobic Polyurea

Patent Title: MOISTURE-CURABLE OMNIPHOBIC COATINGS

Number/Link: US2019/0031909

Applicant/Assignee: US Navy

Publication Date: 31 January 2019

“Gist”: Polyurea topcoat containing both silane and perfluoro groups

Why it is interesting: According to this invention, a coating having both hydrophobic and oleophobic properties can be prepared by reacting an alkoxysilane-terminated polyurea with a perfluoromaterial having at least one alkoxy- or hydroxyl group. In an example a coating is prepared by reacting a polyurea based on HDI trimer and N-butyl-3-aminoppropyltrimethoxysilane with triethoxy(perfluoro-octyl)silane. The coating showed contact angles of more than 140 degrees vs water and more than 90 degrees vs hexadecane.

omniphobicpolyurea

Reaction system according to the invention

Thermoplastic PU-PDMS Copolymer

Patent Title: THERMOPLASTIC POLYURETHANE

Number/Link: WO2019/016313 (German)

Applicant/Assignee: BASF

Publication Date: 24 January 2019

“Gist”:  Thermoplastic polyurethane comprising OH-ended poly(dimethylsiloxane).

Why it is interesting: The invention relates to thermoplastic polyurethanes prepared from diisocyanate, polyether or polyester diol and a difunctional isocyanate-reactive polysiloxane.  The materials are said to have improved “haptic”-, hydrophobicity- and tensile properties while retaining the processibility of TPU and are useful for ‘on-body’ applications like wristbands. In the examples both 4,4′-MDI and HDI are used together with chain extenders, polyTHF, BDO-HDO adipate and EO capped PDMS to prepare TPUs ranging from 55 to 95 Shore A.

pdms-eo

EO-capped PDMS

Polyurethane Oil Gel

Patent Title: OIL GEL, PRESSURE RESISTANT MATERIAL USING SAME FOR PROTECTING ELECTRONIC DEVICES AND OIL GEL-FORMING AGENT

 Number/Link: WO2018135494  (Japanese)

Applicant/Assignee:  Sec Corp.

Publication date: 26 July 2018

Gist”: A gel from a paraffinic  oil and a compatible linear PU is used as a pressure resistant material for deep-sea applications

Why it is interesting: The invention relates to a PU-oil gel that is used as a kind of “potting compound” to protect subsea electronics at “abyssal depths” , i.e. at pressures of 5.6 MPa (about 550m deep). The gel is prepared by reacting a hydrophobic diol and a hydrophobic diisocyanate in the presence of 10-50% (w/w) on the total composition of a paraffinic oil. In the examples an OH-ended, saturated polyisoprene is used as diol together with norbornanediisocyanate.

NBDI

2,5-norbornane diisocyanate