A polyisocyanate composition includes at least a pentamethylenediisocyanate derivative. The polyisocyanate composition contains 5 mass % or more and 95 mass % or less of a uretdione derivative composed of an isocyanate bimolecular-product of pentamethylenediisocyanate.

A polyisocyanate composition includes at least a pentamethylenediisocyanate derivative. The polyisocyanate composition contains 5 mass % or more and 95 mass % or less of a uretdione derivative composed of an isocyanate bimolecular-product of pentamethylenediisocyanate.

In the field of polyisocyanate compositions for the production of coatings and adhesives, the disclosed composition combines a polyisocyanate compound with biuret motifs, a protic, polar reactive diluent compound, one of the addition compounds thereof, and an aprotic reactive diluent compound. Also disclosed is a method for producing the composition, and to the use thereof for producing a coating or an adhesive.

The invention relates to a method for modifying isocyanates, wherein at least one organic monomer isocyanate having an NCO functionality >1 is oligomerised in the presence of at least one catalyst, said method being characterised in that the catalyst comprises at least one specific compound having an NPN sequence selected from compounds of formula I (formula I), and/or from compounds of formula II (formula II) where HX represents an acid with a pKa value 2, X.sup. represents the anion of an acid with a pKa value 2, and n represents an integer or fractional number between 0 and 20, wherein Y represents R.sub.12(R.sub.13)N and/or one or more substituents of the structure of formula III (formula III) and wherein R.sub.1 to R.sub.19 independently represent identical or different substituents selected from C.sub.1-C.sub.20 alkyl-, C.sub.1-C.sub.20 cycloalkyl- and C.sub.6-C.sub.20 aryl groups, or wherein R.sub.1 and R.sub.2, R.sub.3 and R.sub.4, R.sub.5 and R.sub.6, R.sub.7 and R.sub.8, R.sub.9 and R.sub.10, R.sub.12 and R.sub.13, R.sub.14 and R.sub.15, R.sub.16 and R.sub.17, R.sub.18 and R.sub.19 independently represent identical or different substituents selected from C.sub.1-C.sub.20 alkylene-, C.sub.1-C.sub.20 cycloalkylene-, C.sub.6-C.sub.20 arylene groups, and can form a 3- to 12-membered ring with the N atom joined to the P atom. The invention also relates to the use of a catalyst of this type.

The present invention provides a polyisocyanate composition wherein the composition is obtained from an aliphatic diisocyanate unit including 1,6-diisocyanatohexane, and has an isocyanurate group, a uretdione group, a uretonimine group, and an iminooxadiazinedione group, and the molar ratio of the uretonimine group to the isocyanurate group is 0.0010 to 0.0050, and the molar ratio of the iminooxadiazinedione group to the isocyanurate group is 0.00050 to 0.30.

A polyisocyanate composition includes at least a pentamethylenediisocyanate derivative. The polyisocyanate composition contains 5 mass % or more and 95 mass % or less of a uretdione derivative composed of an isocyanate bimolecular-product of pentamethylenediisocyanate.

A polyisocyanate composition includes at least a pentamethylenediisocyanate derivative. The polyisocyanate composition contains 5 mass % or more and 95 mass % or less of a uretdione derivative composed of an isocyanate bimolecular-product of pentamethylenediisocyanate.

The invention relates to a method for modifying isocyanates, wherein at least one organic monomer isocyanate having an NCO functionality >1 is oligomerised in the presence of at least one catalyst, said method being characterised in that the catalyst comprises at least one specific compound having an NPN sequence selected from compounds of formula I (formula I), and/or from compounds of formula II (formula II) where HX represents an acid with a pKa value 2, X.sup. represents the anion of an acid with a pKa value 2, and n represents an integer or fractional number between 0 and 20, wherein Y represents R.sub.12(R.sub.13)N and/or one or more substituents of the structure of formula III (formula III) and wherein R.sub.1 to R.sub.19 independently represent identical or different substituents selected from C.sub.1-C.sub.20 alkyl-, C.sub.1-C.sub.20 cycloalkyl- and C.sub.6-C.sub.20 aryl groups, or wherein R.sub.1 and R.sub.2, R.sub.3 and R.sub.4, R.sub.5 and R.sub.6, R.sub.7 and R.sub.8, R.sub.9 and R.sub.10, R.sub.12 and R.sub.13, R.sub.14 and R.sub.15, R.sub.16 and R.sub.17, R.sub.18 and R.sub.19 independently represent identical or different substituents selected from C.sub.1-C.sub.20 alkylene-, C.sub.1-C.sub.20 cycloalkylene-, C.sub.6-C.sub.20 arylene groups, and can form a 3- to 12-membered ring with the N atom joined to the P atom. The invention also relates to the use of a catalyst of this type.

A process for preparing a thermoplastic polymer involves reacting at least components (a) to (b), in the presence of a catalyst composition (c). Component (a) is an isocyanate composition containing at least one uretdione diisocyanate (a-i), and component (b) is an epoxide composition containing at least one diepoxide (b-i). The catalyst composition (c) contains at least one ionic liquid (c-i), preferably selected from 1-ethyl-3-methyl imidazolium bromide, 1-benzyl-3-methyl imidazolium chloride, 1-butyl-1-methylpiperidinium chloride, 1-ethyl-2,3-dimethylimidazolium bromide, 1-(2-hydroxyethyl)-3-methyl imidazolium chloride, butyl-1-methylpiperidinium acetate, or mixtures of two or more thereof. A thermoplastic polymer obtained or obtainable from the process is useful for the preparation of a fibre or a molded article or as a modifier for another thermoplastic material.