Polyols for Polyurethane Fibre-Reinforced Composite


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


Polyols from Epoxies and Cardanol


 Number/Link: WO2015/077944  WO2015/077945 WO2015/078178

Applicant/Assignee: Dow

Publication date: 4-06-2015

Gist”: Polyols are prepared by reacting an epoxy resin with  cashew nutshell liquid.

Why it is interesting: Cardanol is the main component of  cashew nutshell liquid which is a by-product of cashew nut processing. It is a “surfactant-like” phenolic compound which, when reacted with a polyepoxide, will result in a polyol with sec-OH groups. When used in polyurethane formulations these polyols will (unsurprisingly) be slow-reacting, highly hydrophobic and show compatibilizing properties vs apolar compounds. Dow have therefore filed three patent applications on PU systems containing these polyols: one on slowly-reacting PU systems for filament winding, one on highly hydrophobic PU elastomers and one on asphalt-PU compositions.
These are interesting polyols but they could be hard to process in my opinion.

Cardanol is reacted with bisphenol-A diglycidylether resulting in a diol according to the invention

Cardanol is reacted with bisphenol-A diglycidylether resulting in a diol according to the invention

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