The present invention relates to novel color drift-stable compositions of polyisocyanates of (cyclo)aliphatic diisocyanates.

An isocyanate polymerization catalyst, a preparation method thereof and a method for preparing polyisocyanates comprising isocyanurate groups by using the same. The catalyst is a carboxylic acid salt containing a di-quaternary ammonium ion. The structure of the catalyst contains hydroxyl-containing aromatic heterocyclic residues. The catalyst is highly active. Only a small quantity of the catalyst is required for the polymerization of isocyanates. The prepared polyisocyanates have color values lower than 25 Hazen, monomer contents of less than 0.5% by weight, high contents of isocyanurates and low viscosities.

The present invention provides an adhesive composition for optical use, including a polyester-based urethane acrylate oligomer, an acrylate-based monomer, a photoinitiator, and a Anti-hydrolysis agent, and an optical device equipped with an adhesive layer including photocured products of the adhesive composition for optical use.

A binder system, containing a special polyol mixture as a resin component, said polyol mixture containing at least one polyester based on a fatty acid dimer, a fatty acid trimer or the alcohols derived therefrom, and at least one polyisocyanates as a resin component and/or a NCO-terminated polyurethane prepolymer. The binder system can be used as an adhesive/sealing material, in particular as an adhesive for gluing various substrates.

A polymeric composition for restoring a previously formed spike hole in a wood railroad tie is described. The polymeric composition comprises a resin comprising a chain extender in a concentration of at least about 10 wt % and at least one polyol, and at least one isocyanate-containing compound. The chain extender may be diethylene glycol. The composition may also include a moisture control additive in a concentration of at least 5 wt % of the resin.

The present invention relates to a multi-component urethane adhesive system comprising a prepolymer component and a curative component. The adhesive system is suitable as a primer-less, high temperature-resistant adhesive composition.

A two-liquid type urethane adhesive composition includes a main agent and a curing agent. The main agent includes a poly isocyanate component, and the isocyanate group content in the main agent is 5 mass % or more of the total amount. The curing agent contains a compound having a plurality of active hydrogen-containing groups per molecule, and the compound having a plurality of active hydrogen-containing groups per molecule includes a high molecular weight polyol having two or three hydroxyl groups per molecule and a number average molecular weight of 1800 or greater, a low molecular weight polyol A having two hydroxyl groups per molecule and a number average molecular weight of 200 or less, and a low molecular weight polyol B having three hydroxyl groups per molecule, with at least one of the three hydroxyl groups being secondary hydroxyl groups, and a number average molecular weight of 1200 or less.

A hybrid polyurethane/polyurea polymer suitable for forming a coating on a structure which is in contact with water includes the reaction product of a polyol component consisting of one or more polyols, a polyamine, and a curing agent, such as a polyisocyanate. The polyol component includes a Novolac-type polyether polyol.

An exemplary embodiment of the present disclosure provides a polyurethane core for use in a floor or wall panel, the core comprising a polyol made, at least in part, from one or more recycled materials, and an isocyanate.

The invention relates to a method for producing a polyurethane flooring (129) for a sports field (136), the method comprising: providing (502) reactive components for producing polyurethane, the reactive components comprising an A component (902) being a polyol mixture and a B component (904) being an isocyanate mixture and water (914), the B component comprising: 2,2 Methylendiphenyldiisocyanate (922); diphenylmethane-2,4-diisocyanate (924); diphenylmethane-4,4-diisocyanate (926); and isocyanate prepolymer (932); mixing (504) the reactive components for generating a liquid polyurethane reaction mixture (129); applying (506) the polyurethane reaction mixture (128) to a ground (103) of the sports field before chemical reactions in the reaction mixture have generated a solid polyurethane foam, the polyurethane foam after its solidification to be used as the polyurethane flooring.