Low Viscosity Polyester Polyols

Patent Title: LOW VISCOSITY POLYOLS FOR POLYURETHANE APPLICATIONS

Number/Link: WO2019/010018

Applicant/Assignee: Stepan

Publication Date: 10 January 2019

“Gist”: Polyester polyol containing lactide

Why it is interesting:  The invention relates to low viscosity polyester polyols for use in crosslinked polyurethane coating compositions. The polyols are prepared from a polycarboxylic acid, one or more polyols and 5-35% lactide. In an example adipic acid is reacted with lactide, neopentyl glycol and trimethylolpropane. Coatings made from these polyols are said to have improved hardness and solvent resistance and a low VOC content.

lactide

Lactide

TPU with High EMR Permeability

Patent Title: POLYURETHANES WITH GOOD PERMEABILITY FOR ELECTROMAGNETIC RADIATION

Number/Link: WO2019/002350 (German)

Applicant/Assignee: BASF

Publication Date: 3 January 2019

“Gist”:  TPU based on aliphatic polycarbonate diol

Why it is interesting: The invention relates to thermoplastic polyurethanes with a high permeabilty to electromagnetic radiation, especially in the 0.5 to 3 GHz frequency range. (I assume these materials are aimed at mobile phone covers and the like). ‘Surprisingly’ it was found that such TPUs can be prepared from polycarbonate diols which are based on butanediol, pentanediol or hexanediol. In the examples, TPUs based on these diols together with BDO and 1,6-HDI or 4,4′-MDI, show a lower dielectric loss factor at 400 MHz as compared to TPUs based on other polyols.

TPU cover

TPU mobile phone case.

 

Polyols for Polyurethane Fibre-Reinforced Composite

Patent Title: PROCESS FOR PRODUCING FIBER COMPOSITE MATERIAL USING HYBRID POLYOL

Number/Link: WO2018/224592 (German)

Applicant/Assignee: BASF

Publication Date: 13 December 2018

“Gist”: Composite composition based on polyol prepared from initiator mixture comprising castor oil

Why it is interesting: Polyurethane composite production by filament winding, pultrusion and similar processes are known.  These PU systems need a low viscosity, good fibre-wetting properties, long open time and preferably a “snap cure” when activated.  According to this invention, such systems can be prepared from polyols which are made by alkoxylating an initiator mixture consisting of a (pref) 50/50 (w/w) mixture of a fat-based alcohol and an aliphatic trifunctional alcohol, using imidazole catalysis. In an example a castor oil/glycerol mixture is propoxylated to an OH value of  480 mg KOH/g.  Surprisingly this polyol shows a longer open time compared to the corresponding mixture of seperately initiated polyols.

castor oil

Main component of castor oil