1) Polyurethane composition comprising: a) at least 98% by weight of at least one non-hot-melt polyurethane bearing NCO end groups based on diphenyl methane diisocyanates (MDI), b) a MDI monomer content of less than or equal to 1% by weight, c) at least one particular isocyanate compound with a molar volume of less than or equal to 300 millilitres per mole. 2) Process for preparing a polyurethane composition as defined previously, and an adhesive, mastic and/or surface coating composition formulated from such a polyurethane composition.

1) Polyurethane composition comprising: a) at least 98% by weight of at least one non-hot-melt polyurethane bearing NCO end groups based on diphenyl methane diisocyanates (MDI), b) a MDI monomer content of less than or equal to 1% by weight, c) at least one particular isocyanate compound with a molar volume of less than or equal to 300 millilitres per mole. 2) Process for preparing a polyurethane composition as defined previously, and an adhesive, mastic and/or surface coating composition formulated from such a polyurethane composition.

The present invention relates to a method for producing a prepolymer that contains carbon-carbon multiple bonds, a polyol component A) being reacted with component B) that contains isocyanate groups and the polyol component comprising a polyether carbonate polyol that contains carbon-carbon multiple bonds.

The present invention relates to a method for producing a prepolymer that contains carbon-carbon multiple bonds, a polyol component A) being reacted with component B) that contains isocyanate groups and the polyol component comprising a polyether carbonate polyol that contains carbon-carbon multiple bonds.

A method of a polyurethane foam includes the following steps of: (1) simultaneously pumping a mixed solution prepared from hydrogen peroxide, an organic acid, a catalyst and a stabilizer and a vegetable oil into a first microstructured reactor of a micro-channel modular reaction device for reacting to obtain a reaction solution containing epoxidized vegetable oil; (2) simultaneously pumping the reaction solution containing the epoxidized vegetable oil obtained from the step (1) and a compound of formula III into a second microstructured reactor of the micro-channel modular reaction device for reaction to obtain a vegetable oil polyol; and (3) reacting the vegetable oil polyol prepared from the step (2) with a foam stabilizer, a cyclohexylamine, an isocyanate and a foaming agent cyclopentane for foaming so as to prepare a rigid polyurethane foam.

A method of a polyurethane foam includes the following steps of: (1) simultaneously pumping a mixed solution prepared from hydrogen peroxide, an organic acid, a catalyst and a stabilizer and a vegetable oil into a first microstructured reactor of a micro-channel modular reaction device for reacting to obtain a reaction solution containing epoxidized vegetable oil; (2) simultaneously pumping the reaction solution containing the epoxidized vegetable oil obtained from the step (1) and a compound of formula III into a second microstructured reactor of the micro-channel modular reaction device for reaction to obtain a vegetable oil polyol; and (3) reacting the vegetable oil polyol prepared from the step (2) with a foam stabilizer, a cyclohexylamine, an isocyanate and a foaming agent cyclopentane for foaming so as to prepare a rigid polyurethane foam.

A compound containing at least one hexahydrotriazine unit of formula (I) having at least one amidine or guanidine group and to the use thereof as a catalyst for the crosslinking of a functional compound, in particular a polymer including silane groups. The compound contains at least one hexahydrotriazine unit of formula (I) is producible in a simple process from readily available feedstocks, odorless at room temperature, non-volatile and largely non-toxic. The compound accelerates the crosslinking of functional polymers surprisingly well and by simple variation of the substituents is variable such that it has very good compatibility in different polymers as a result of which such compositions do not have a propensity for migration-based defects such as separation, exudation or substrate contamination.

A compound containing at least one hexahydrotriazine unit of formula (I) having at least one amidine or guanidine group and to the use thereof as a catalyst for the crosslinking of a functional compound, in particular a polymer including silane groups. The compound contains at least one hexahydrotriazine unit of formula (I) is producible in a simple process from readily available feedstocks, odorless at room temperature, non-volatile and largely non-toxic. The compound accelerates the crosslinking of functional polymers surprisingly well and by simple variation of the substituents is variable such that it has very good compatibility in different polymers as a result of which such compositions do not have a propensity for migration-based defects such as separation, exudation or substrate contamination.

Reprocessable crosslinked polyurethane networks, methods for making the reprocessable polyurethane networks, and methods for depolymerizing the crosslinked polyurethane networks and recovering the depolymerized monomers are provided. The polyurethane networks are rendered reprocessable by the incorporation of free hydroxyl groups and the incorporation of multi-functional alcohol crosslinkers.

The present invention relates to a one-component system comprising a) at least one polyurethane prepolymer based on at least one di- and/or polyisocyanate and at least one di- and/or polyol, wherein at least one di- or polyol is a polyalkylene glycol having a number-average molecular weight of 900 to 2150 g/mol, wherein all unconverted isocyanate groups are blocked with at least one malonic ester and b) at least one di and/or polyamine;
to a process for its production, to its use and to processes employing it for producing artificial leather and (artificial) leather coatings.