Polyurethane Coating for Frac Tanks

Title: SPRAYABLE POLYURETHANE BASED PROTECTIVE COATING

 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.

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

Improved Viscoelastic Flexible Foams (“Memory Foams”)

Title: USE OF POLY(BUTYLENE OXIDE) POLYOL TO IMPROVE DURABILITY OF MDI-POLYURETHANE FOAMS

Patent Number & Link:  US2013178548    (related case US2013178550 )   

Applicant/Assignee: Dow

Publication date: 11-07-2013 (priority PCT/US)

Gist”: Use of a high molecular weight butyleneoxide monol to improve the compression set of viscoelastic foams.

Why it is interesting: Viscoelastic or “memory” flexible foams are currently popular for use in matresses and pillows. Much research and development has been done on these materials and the patent situation is a true minefield. Usually a mixture of EO-rich and PO-rich polyols of different molecular weights is used to control the glass transition temperature (Tg) of the softblock, wich in turn controls the energy absorption (and thus the resilience) of the foam. In this invention a butyleneoxide monol of high MW is used in addition to a mixture of EO-rich and PO-rich polyols. The BO-monol is used in an amount of 2-10% on the polyol  and supposedly improves compression set while retaining the open cell character (air flow) of the foam.
The related case (US2013/178550) is similar but uses a high MW PO polyol with a functionality between 1 and 4 instead of the BO monol.  It is not immediately clear to me whether this latter case is a real invention or is just plugging a hole in the minefield..

A viscoelastic flexible foam

A viscoelastic flexible foam

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