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

Polyamide Polymer Polyols

Patent Title: POLYAMIDE DISPERSION IN POLYOL AND PREPARATION THEREOF

 Number/Link: WO2017/216209

Applicant/Assignee:  BASF

Publication date: 21 December 2017

Gist”: Polyamide particles from polyether diamine and adipic acid are dispersed in polyol

Why it is interesting: Conventional polymer polyols contain either SAN-, polyurethane- or polyurea particles (see e.g. here).  According to this invention, polymer polyol dispersions can also be prepared by reacting a diamine, containing at least 50 wt% of a linear polyether having two terminal primary amine groups with a dicarboxylic acid (e.g. adipic acid) in a polyether polyol.  The reaction results in a dispersion of polyamide particles in the polyether polyol, stabilized by the polyether diamine. The polymer polyols are useful for flexible foam production and are said to show an improved hydrolysis resistance.

adipicacid

Adipic acid

TPU from POM-Polyether Polyols

Title: THERMOPLASTIC POLYURETHANES, PRODUCTION AND USE THEREOF

 Number/Link: WO2015/155084  (German)

Applicant/Assignee: Bayer

Publication date: 15-10-2015

Gist”: Paraformaldehyde-PO polyols are used to make TPU

Why it is interesting: Polyoxymethylene (POM) is a highly crystalline ‘engineering thermoplastic’ often used in blends together with TPU. In this invention POM is not blended but used to make a POM-polyether ‘block’ diol which is then used to make TPU. The diol is prepared by using paraformaldehyde as a starter which is reacted with PO (and optionally CO2) using DMC catalysis. The POM-block acts as a ‘hard block’ and use of the diol allows for an improved control of Tg, melt viscosity, hardness, chemical resistance etc. of the TPU.  In the examples TPU is made from a 2000 MW parafomaldehyde/PO-CO2 block copolymer  together with 4,4’MDI and BDO.

Paraformaldehyde

Paraformaldehyde

Polyurea ‘Nano’-Particles to Improve Properties of Polyurethane Flexible Foams and Elastomers

Title: USE OF POLYUREA NANOPARTICLES AS PERFORMANCE MODIFIERS IN POLYURETHANE MATERIALS

 Number/Link: WO2014/012769

Applicant/Assignee: Huntsman

Publication date: 23-01-2014

Gist”: A dispersion of polyurea particles prepared from 4,4′ MDI, diamine chain extender and a high mole weight monoamine is used to improve mechanical properties of flex foam.

Why it is interesting: Dispersions of polyurea particles with an average diameter of a few hundred nanometer and a Tg>150°C (pref.) can be produced by first reacting a relatively high MW polyether monoamine and a di-isocyanate (optionally dispersed in e.g. polyol) and subsequently adding a diamine chain extender. The dispersion is then used in a flexible foam or elastomer formulation, such that the amount of particles in the material is about 1-5% (w/w). In an example a 2000MW EO/PO monoamine was used together with 4,4′-MDI and a diamine chain extender to produce a particle dispersion in polyol, which was then used in polyurethane formulations. The particles do seem to have a positive effect on mechanical properties, however, the results for flex foam are clouded because of a sharp increase in material density compared to the reference. This density increase may well be due to a cellopening effect as described in WO2007/104623  in which a similar particle dispersion is used.

Polyethermonoamine as used in the invention.

Polyethermonoamine as used in the invention.