UV Resistant Viscoelastic Foams

Patent Title: POLYURETHANE PRODUCT WITH SULFUR-CONTAINING POLYOL

 Number/Link: WO2018/111806

Applicant/Assignee:  Dow

Publication date: 21 June 2018

Gist”: VE foams using S-containing polyether polyols

Why it is interesting: According to this invention sulfur containing polyols improve the UV resistance of polyurethane materials.  It is believed that sulfur acts as a UV absorber incorporated into the polymer, thereby reducing the need for additives such as antioxidants.  In the examples an S-containing polyether diol is prepared by reacting 2,2′-thiodiethanol with propyleneoxide up to an OH value of  188 mg KOH/g. The diol is then used in an amount of 5 to 15% on the total polyol blend to prepare low resilience flexible foams showing an improved UV resistance.

 

TDE

2,2′-thiodiethanol

 

Free Download: Polyurethane Science Scan Nr.12 – April & March 2018

You can now download the 12th issue of my PU Science review for FREE from my webshop at http://sellfy.com/GeertBleys.

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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.

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