All posts in category Polyols

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.

Main component of castor oil

Polyurethanes from Bisphenol-Based Polyols

Patent Title: OLIGOMERIC POLYOL COMPOSITIONS

Number/Link:WO2018/190891

Applicant/Assignee: Presidium USA

Publication date: 18 October 2018
“Gist”: Polyurethanes from high functionality bisphenol-based polyols

Why it is interesting: The invention relates to high functionality (and high viscosity) polyols that consist of bisphenol moieties and aliphatic polyol moieties and that can be prepared by reacting a bisphenol-based polycarbonate with a short-chain, high functionality polyol in the presence of a suitable catalyst or promotor. In the examples a bisphenol-A based polycarbonate powder is reacted with propoxylated pentaerythritol and a tetra – OH – functional tert-amine that acts as a promotor. The polyols are said to be useful for high stiffness polyurethanes that show improved heat distortion and a relatively low reaction exotherm.

Catalytic tetrol used in the invention

PU Elastomers from SGO Polymerized Acrylic Polyols

Patent Title: PHYSICAL PROPERTY IMPROVEMENT OF POLYURETHANES

Number/Link: WO2018/132648

Applicant/Assignee: BASF

Publication date: 19 July 2018

“Gist”: Solvent-free acrylate polyols are reacted together with polyether polyols and diisocyanates

Why it is interesting: In this invention a solvent-free (“100% solids” in the patent’s terminology) acrylic polyol is blended with a conventional polyether polyol and reacted with an aliphatic or aromatic diisocyanate. The acrylic polyol is prepared by co-polymerizing (e.g.) ethyl- or butyl (meth)acrylates, styrene and a hydroxyl functional acrylate like 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate, using BASF’s “solid grade oligomer” (SGO) polymerization process. The SGO process is a high temperature and high pressure continuous process allowing for the production of low-solvent acrylic resins. The polyurethanes are said to have increased physical properties, esp. tear- and tensile strength properties.

Hydroxybutylacrylate

Innovation in Polyurethanes

All posts in category Polyols

Polyols for Polyurethane Fibre-Reinforced Composite

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Polyurethanes from Bisphenol-Based Polyols

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PU Elastomers from SGO Polymerized Acrylic Polyols

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