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

Fluorinated Thermoplastic Polyurethanes

Patent Title: SHOE UPPERS & CASE FOR PORTABLE DEVICES

 Number/Link: WO2018/007359  WO2018007360

Applicant/Assignee:  Solvay

Publication date:  11 January 2018

Gist”:  F-TPUs are prepared by incorporating perfluoro diols

Why it is interesting: The current inventions are about fluorinated TPU and its applications. The F-TPUs are prepared by replacing part of the polyol with hydroxyl-ended fluorinated polyethers. In the examples fluorinated polyether diols are used in different ratios to conventional polyester-, PTMEG-, CAPA- and polycarbonate diols and reacted with MDI or HDI and BDO or HDO as chain extenders. The F-TPUs can be used as uppers for footwear and as cases for smartphones and are said to have improved stain resistance and – surprisingly- a soft feel to the touch.

case

F-TPU smartphone case

 

Urethane-Acrylate Hybrids From Thiol-Ene Chemistry

Title: POLYURETHANE (METH) ACRYLATES USING MODIFIED HYDROXYTHIOLS

 Number/Link: US2015/0232422

Applicant/Assignee: Dymax Oligomers and Coatings

Publication date: 20-08-2015

Gist”: A dihydroxythiol is reacted with an acrylate and then with diisocyanate and hydroxyacrylate

Why it is interesting: This invention relates to radically polymerizable urethane oligomers which are useful as adhesives or coatings. The oligomers are prepared in two stages:  first a dihydroxy thiol is reacted with an acrylate resulting in a diol which is then reacted with an excess diisocyanate and then with hydroxyacrylates.  For example: thioglycerol is reacted with phenyltioethylacrylate.  The resulting diol is then further reacted with TDI and subsequently with polycaprolactonacrylate and hydroxyethylacrylate resulting in the structure below. The urethane oligomers can be used for coatings or adhesives which are said to have improved properties over the existing art, like improved thermal resistance.

A urethane-acrylate oligomer according to the invention

A urethane-acrylate oligomer according to the invention