Low Viscosity Polyester Polyols


Number/Link: WO2019/010018

Applicant/Assignee: Stepan

Publication Date: 10 January 2019

“Gist”: Polyester polyol containing lactide

Why it is interesting:  The invention relates to low viscosity polyester polyols for use in crosslinked polyurethane coating compositions. The polyols are prepared from a polycarboxylic acid, one or more polyols and 5-35% lactide. In an example adipic acid is reacted with lactide, neopentyl glycol and trimethylolpropane. Coatings made from these polyols are said to have improved hardness and solvent resistance and a low VOC content.




Thermoreversible Polyurea


 Number/Link: W02016/069582

Applicant/Assignee: University of Illinois

Publication date: 6-05-2016

Gist”: Urea bonds prepared from sterically hindered amines and isocyanates

Why it is interesting: The N-C bond in urea is very stable due to conjugation of the lone electron pair of the nitrogen atom with the cabonyl group.  According to this invention, the nitrogen atom can be subsituted with a strongly hindering group such that the coplanarity, and therefore most of the conjugation, of the C-N and C=O bonds is lost. These hindered urea bonds are much less stable and can reversibly depolymerize at relatively low temperatures. Thermoreversible bonds can be useful in a number of smart materials such as self-healing-, “4D printing”- , and reprogrammable shape memory materials. In an example a shape memory material with a Tg of 53°C and a Young’s Modulus of about 2 GPa was prepared by reacting 2-(t-buylamino)ethanol (TBAE) and trimerized hexamethylene diisocyanate (THDI). The ‘permanent shape’ of the material could be re-programmed by forcing the material in a new shape for 72 hours at 60°C.

Polurethane-urea with thermoreverisble urea bonds

Poly(urethane-urea) with thermoreverisble urea bonds

Polyurethane Coating for Frac Tanks


 Number/Link:  WO2015/050811

Applicant/Assignee: Dow

Publication date: 9-04-2015

Gist”: Use of butylene oxide polyols in sprayable coating composition

Why it is interesting: The hydraulic fracturing fluids used in ‘fracking’ operations are stored and transported in so-called ‘frac tanks’. Because fracking fluids can contain highly corrosive compounds such as HCl and solvents such as toluene and xylene, the tanks need a protective coating with a high chemical resistance. According to this application such a coating can be accomplished using a sprayable 2 component system comprising polyols with a high butylene oxide (BO) content, e.g. polyols prepared from 80% butylene oxide and 20% propylene oxide (PO) with a molecular weight of about 2000 and a functionality of 2. In the first component the BO/PO polyol is prepolymerized with an isocyanate e.g. MDI, while used as such in the second component. The two components are prepared such that they both show a similar viscosity of less than 1500 cP at 25°C, so that the coating composition is sprayable.

Frac tank.

Frac tank.

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