A process for preparing a crosslinkable composition comprising at least one alkoxysilane-terminated silyl polymer P, and at least one catalytic system B comprises: a. preparing an alkoxysilane-terminated silyl polymer P comprising: a-1) the polyaddition reaction between a composition of polyol(s) and a composition of polyisocyanate(s), in the presence of a catalyst A chosen from carboxylates based on bismuth and/or zinc, in order to prepare an NCO-terminated polymer; a-2) the reaction of the NCO-terminated polymer obtained in step a-1) with an organosilane compound having at least one function that is reactive with the —NCO function of the NCO-terminated polymer; and b. bringing the silyl polymer P obtained in step a) into contact with a catalytic crosslinking system B which is a mixture of zinc-based carboxylate(s) and cyclic amidine. The process is carried out in the absence of a tin-based catalyst.

This invention relates to novel preformed stabilizers in which a portion of the polymer control agent is recovered and comprises from 10 to 1500 ppm of an inhibitor. This invention also relates to a process for preparing these preformed stabilizers, and to polymer polyols comprising these novel preformed stabilizers macromers and to a process for preparing polymer polyols comprising these novel preformed stabilizers. The present invention also relates to polyurethane foams comprising these polymer polyols, and to processes for preparing these polyurethane foams.

This invention relates to an in-situ formed polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 50 to 150. A process for preparing these polyol blends is also disclosed. These in-situ formed polyol blends are suitable for preparing viscoelastic flexible polyurethane foams. A process for preparing these foams is also disclosed.

A method for producing a prepolymer for the production of an integral polyurethane foam is provided. The prepolymer is or can be obtained by reaction of a composition that contains the following components: component A containing a polyoxymethylene-polyoxyalkylene block copolymer having a hydroxyl number of 20 mg KOH/g to 200 mg KOH/g as component Al, component B containing di- and/or polyisocyanates with an NCO content of 15 to 45 wt.-% relative to component B, 0.04 to 1.0 wt.-%, relative to the composition, a proton acid as component C, and optionally a component D that contains auxiliary agents, at a characteristic number of 450 to 850. The invention further relates to the prepolymer obtained by the method, to an integral polyurethane foam based on the prepolymer, and to the use thereof.

Embodiments of the present disclosure are directed to haze-free polyurethane formulations, more particularly, to haze-free polyurethane formulations including tripropylene glycol (TPG) initiator polyol formed in the presence of a double metal cyanide (DMC) catalyst via a continuous process that can be utilized to form haze-free polyurethanes. As an example, a haze-free polyurethane formulation can include a TPG initiator polyol formed in the presence of a DMC catalyst via a continuous process, where the TPG pre-polymer is 30 to 45 percent by weight of the haze-free polyurethane formulation, an organic solvent present from 30 to 60 percent by weight of the haze-free polyurethane formulation, and a polyisocyanate, where the polyurethane formulation has an isocyanate index in a range from 70 to 500.

The invention relates to a polymer composition that can be produced by (a) reacting an NCO-reactive polymer having exactly one NCO-reactive group per molecule, with a diisocyanate, the molar ratio of the diisocyanate molecule to the NCO-reactive groups of the NCO-reactive polymer being at least 2:1; and (b) reacting the residual NCO groups in the reaction product from step a) with an NCO-reactive silane. The invention also relates to a moisture-reactive composition containing said polymer composition, to methods for producing the polymer composition, and to moisture-reactive compositions containing said polymer composition. Finally, the invention relates to the use of the polymer composition as a drying agent for moisture-curing adhesives, sealants and coating agents.

The invention relates to a polymer composition that can be produced by (a) reacting an NCO-reactive polymer having at least two NCO-reactive groups, with a polyisocyanate, the molar ratio of polyisocyanate molecules to NCO-reactive groups of the NCO-reactive polymer being at least 1.25:1; and (b) reacting the reaction product from step a) with an NCO-reactive silane. The invention also relates to a moisture-reactive composition containing the polymer composition and to methods for producing the polymer composition and the moisture-reactive composition. Finally, the invention relates to the use of the polymer composition as a drying agent for moisture-curing adhesives, sealants and coating agents.

A polyetherurethane polymer containing isocyanate groups and having an NCO content in the range from 1.3% to 1.9% by weight and a monomeric diisocyanate content of not more than 0.5% by weight, obtained from the reaction of at least one monomeric aromatic diisocyanate and a polyether triol having an average OH functionality in the range from 2.2 to 2.6 and an OH number in the range from 25 to 32 mg KOH/g in an NCO/OH ratio of at least 3/1 and subsequent removal of a majority of the monomeric diisocyanates by means of a suitable separation method, and to moisture-curing polyurethane compositions having a monomeric diisocyanate content of less than 0.1% by weight, comprising said polymer.

The invention relates to a method for producing polyether carbonate polyols, wherein (i) in a first step a polyether carbonate polyol is produced from one or more H-functional starter substances, one or more alkylene oxides, and carbon dioxide in the presence of at least one DMC catalyst, and (ii) in a second step the polyether carbonate polyol is chain-extended with a mixture of at least two different alkylene oxides in the presence of at least one DMC catalyst. The invention further relates to polyether carbonate polyols that contain a terminal mixed block of at least two alkylene oxides and to a method for producing soft polyurethane foams, wherein a polyol component containing a polyether carbonate polyol according to the invention is used.

An adhesive composition, including at least polymer containing silane groups, between 15 and 35 wt.-% of at least one polymeric plasiticzer, between 0.5 and 2.5 wt.-% of at least one monomeric or oligomeric aminofunctional alkoxysilane S1 with a nitrogen content of between 4.5 and 14.5 wt.-%, and between 0.5 and 2.5 wt.-% of at least one oligomeric aminofunctional alkoxysilane S2 with a nitrogen content of between 15 and 20 wt.-%. The adhesive composition is particularly suitable to seal or bond thermoplastic substrates, such as polyolefins or bituminous materials, and shows fast adhesion build-up and low volatile organic carbon (VOC).