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

Hybrid Polyisocyanurates for Composites and Coatings

Patent Title: DUAL-CURING ISOCYANURATE POLYMERS

 Number/Link:WO2018/087395 WO2018/087396  WO2018/087399 (German)

Applicant/Assignee:  Covestro

Publication date: 17 May 2018

Gist”:  Di-isocyanate trimer is reacted with hydroxymethacrylates and polyacrylates in the presence of a trimerization catalyst. 

Why it is interesting: According to these inventions a reaction system with two curing modes can be prepared by mixing high functionality oligomeric isocyanate, ethylenically unsaturated compounds, unsaturated compounds containing isocyanate-reactive groups, timerization catalyst and a free-radical initiator at an NCO index of 100 to 200. The system shows a relatively low viscosity and can e.g. be used in fiber-reinforced composites and in coatings. In the examples HDI trimer is reacted with hexanedioldimethacrylate and hydroxypropylmethacrylate in the presence of potassium acetate and a peroxybenzoic acid.

HDI isocyanurate

HDI-trimer