Proppant Coatings with Controlled Release

Patent Title: TIME RELEASED DELIVERY OF FUNCTIONAL CHEMICALS

 Number/Link: US2018/0127638

Applicant/Assignee:  Covestro

Publication date: 10 May 2018

Gist”:  Functional chemicals are reacted with isocyanates for controlled release in fracking wells.

Why it is interesting:  Hydraulic fracturing for oil and gas production is a complex process that requires a “fracking fluid” containing a proppant together with a host of chemicals like defoamers, demulsifiers, biocides etc.  According to this application it is advantageous that these chemicals are released slowly over time during the complete lifecycle of the well. It is stated that this can be achieved by reacting the additives with mono- or polyfunctional isocyanates and (e.g.) incorporating these compounds into the proppant coating.  The additives should have an active hydrogen able to react with isocyanate, or be modified to have such.
The text does not propose a mechanism for this controlled release and it is not clear why this should work.  And -strangely- the “examples” section does not contain any examples.       

list

Some fracking fluid additives.

Free Download: Polyurethane Science Scan Nr.11 – February & March 2018

You can now download the 11th issue of my monthly PU Science Scan for FREE from my webshop at http://sellfy.com/GeertBleys.

cover11

Innovation in Polyurethanes 2018: Table of Contents

 “Innovation in Polyurethanes – 2018 edition” is an in-depth review of the main polyurethane patent literature published during 2017, covering many hundreds of patent applications revealing the major industrial research trends, player activities and technologies. With many examples, direct download links to full-text documents, 63 figures and graphs and 30 tables.

Click here to order
 You can also download the e-book directly: click here to visit my webshop
For any questions or remarks, please contact me

 

Table of Contents:
Introduction ……………………………………………………………….3

The main trends in the 2017 polyurethane patent literature ………………………5
Medical applications ………………………………………………………..5
Flammability ……………………………………………………………….7
Reduction of emissions……………………………………………………….9
Renewable Raw Materials……………………………………………………. 11
Hybrids …………………………………………………………………. 12
Smart Materials…………………………………………………………… 16
Non-Isocyanate Polyurethanes……………………………………………….. 18
Nanocomposites …………………………………………………………… 20
Trending Chemistries and Raw Materials ……………………………………… 21
The Curtius rearrangement: ……………………………………………… 21
The “alkyne zipper” reaction ……………………………………………. 23
Thiol -ene reaction…………………………………………………….. 23
Metathesis reactions …………………………………………………… 24
Polyrotaxanes …………………………………………………………. 25
Computer Displays ………………………………………………………… 27

The main applicants of 2017 ……………………………………………….. 28
BASF ……………………………………………………………………. 28
Covestro ………………………………………………………………… 31
Dow …………………………………………………………………….. 34
DIC …………………………………………………………………….. 36
Henkel ………………………………………………………………….. 38
Evonik ………………………………………………………………….. 39
Lubrizol ………………………………………………………………… 41
Bridgestone ……………………………………………………………… 42
Huntsman ………………………………………………………………… 43
Mitsui Chemicals …………………………………………………………. 44
SIKA ……………………………………………………………………. 45

The Main Technologies ..…………………………………………………… 47
CASE ……………………………………………………………………. 47
Elastomers ………………………………………………………………. 57
TPU …………………………………………………………………….. 61
Flexible Foams …………………………………………………………… 66
Rigid Foams ……………………………………………………………… 69
Polyols …………………………………………………………………. 71
Isocyanates ……………………………………………………………… 73
Composites ………………………………………………………………. 74
Other Foams ……………………………………………………………… 76
Other Polyurethanes ………………………………………………………. 77

 

front page:

Now Available: “Innovation in Polyurethanes – 2018 edition

 “Innovation in Polyurethanes – 2018 edition” is an 81-pages long in-depth review of the main polyurethane patent literature published during 2017, covering many hundreds of patent applications revealing the major industrial research trends, player activities and technologies. With many examples, direct download links to full-text documents, 63 figures and graphs and 30 tables.

Click here to order
You can also download the e-book directly: click here to visit my webshop
For any questions or remarks, please contact me
Cover&TOC

Sequence-Defined Polyurethanes for Information Storage

Patent Title: UNIFORM SEQUENCE-DEFINED POLYURETHANES AND USES THEREOF AS MOLECULAR LABELS

 Number/Link: WO2017/194694

Applicant/Assignee:  Centre National de la Recherche

Publication date: 16 November 2017

Gist”: Stepwise immobilized polymer synthesis is used to make polyurethane having a predefined sequence of monomers

Why it is interesting: The invention is about monodisperse polyurethanes consisting of a well-defined sequence of monomers having various chain lengths and side groups – not unlike proteins or nucleic acids. In a first step a solid support (e.g. polystyrene beads) which bears a cleavable tether molecule is reacted with N,N’-disuccinimidylcarbonate and in a second step with an aminoalcohol like 5-amino-1-pentanol. Steps 1 and 2 are then repeated using the same or a different aminoalcohol. Finally the tether is cleaved from the support.  If 2 different aminoalcohols are used, a binary code can be encoded in the molecule which can later be read using a sequencing technique. The polyurethanes are said to be useful in anti-counterfeiting technologies.

Capture1

Reaction sequence according to the invention