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

UV Resistant Viscoelastic Foams

Patent Title: POLYURETHANE PRODUCT WITH SULFUR-CONTAINING POLYOL

 Number/Link: WO2018/111806

Applicant/Assignee:  Dow

Publication date: 21 June 2018

Gist”: VE foams using S-containing polyether polyols

Why it is interesting: According to this invention sulfur containing polyols improve the UV resistance of polyurethane materials.  It is believed that sulfur acts as a UV absorber incorporated into the polymer, thereby reducing the need for additives such as antioxidants.  In the examples an S-containing polyether diol is prepared by reacting 2,2′-thiodiethanol with propyleneoxide up to an OH value of  188 mg KOH/g. The diol is then used in an amount of 5 to 15% on the total polyol blend to prepare low resilience flexible foams showing an improved UV resistance.

 

TDE

2,2′-thiodiethanol