Scorch-Proof Polyurethane Foams

Patent Title:  LOW EMISSIONS SCORCH INHIBITOR FOR POLYURETHANE FOAM

 Number/Link: WO2018/064521

Applicant/Assignee:  Vanderbilt Chemicals

Publication date: 5 April 2018

Gist”: A synergistic mixture of antioxidants prevents scorch

Why it is interesting: “Scorch” is a discolouration of the center of (especially low-density flexible) polyurethane slabstock foams as a consequence of excessive heat build-up during production. It is believed to be the result of free-radical reactions of foaming components and additives, like the dimerisation of BHT – a common antioxidant. According to this invention the combination of three to (optionally) 5 specific antioxidants show an unexpected synergy towards prevention of scorch. The inventive composition consists of 2,2,4-trimethyl-1,2-dihydroquinoline, a lactone (e.g. 3-alkyl- benzofurane-2-one), a phenolic compound (e.g. an alkylated monophenol) and optionally a tocopherol (a vitamine E-type phenolic compound) and a phosphite compound.  The composition is said to have the added advantage of showing low volatile chemical emissions.

quinoline

2,2,4-trimethyl-1,2-dihydroquinoline

Oxidation-Proof TPU

Patent Title: POLYURETHANE, METHOD OF PREPARATION, AND ARTICLE COMPRISING THE POLYURETHANE

 Number/Link:  WO2018/057488

Applicant/Assignee:  THE UNIVERSITY OF MASSACHUSETTS

Publication date:  29 March 2018

Gist”:  TPU based on hydrogenated diene diols

Why it is interesting: TPUs based on polyether- or polydiene-diols are prone to oxidative degradation and therefore less useful for e.g. medical applications.  According to this invention, oxidation-stable TPUs can be prepared from hydrogenated polydiene diols with an Mn of 500 to 2000, combined with 5-25% (w/w) polyether diols, chain extender and diisocyanate.  In an example a hydogenated polybutadienediol with Mn of 2000 Da was reacted with 4,4′-MDI together with PTMEG 1000 and BDO in toluene.  At a hardblock content of 35% the TPU showed a Shore hardness of 80A, 250MPa tensile strength and an elongation at break of 520%.

PIB

Hydrogenated (1,2) polybutadiene

 

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

TPU for RTM

Patent Title: THERMOPLASTIC PUR WITH HIGH TG FOR REACTION TRANSFER MOLDING (RTM)

 Number/Link: WO2018/050433

Applicant/Assignee:  Henkel

Publication date: 22 march 2018

Gist”:  High Tg TPU from polycyclic diols

Why it is interesting: The invention is about thermoplastic polyurethanes with high Tg and high stiffness that are useful for fiber-reinforced composites made by (reactive) resin transfer moulding.  The TPU is prepared from an isocyanate, a conventional diol chain extender and at least 25% (w/w) of a bridged- fused- or spiro- polycyclic diol. In the examples MDI is reacted with 1,2-propanediol or 2,3-butandiol and 4,8-bis(hydroxymethyl)tricyclo[5.2.1.02,6]decane. The resulting TPUs show a Tg of more than 135°C.

tricylodecane

4,8-bis(hydroxymethyl)tricyclo[5.2.1.02,6]decane

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.

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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

 

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