Nanoparticle modified polyisocyanate

摘要

Preparing a nanoparticle-modified polyisocyanate comprises reacting polyisocyanate with an alkoxy silane compound (I), a hydroxyl group containing polysiloxane compound (II) and optionally a blocking agent, where the number average molecular weight of (II) is 200-3000 g/mole and an average hydroxyl functionality of >= 1.8; and subsequently dispersing inorganic particles having an average dynamic light scattering in an emulsion, an average particle size (Z average) of less than 200 nm and optionally surface modified. Preparing a nanoparticle-modified polyisocyanate comprises: reacting polyisocyanate with an alkoxy silane compound of formula (Q-Z-SiX aY 1>3a) (I), a hydroxyl group containing polysiloxane of formula (R-X-Si(R 1>) 2-(O-Si(R 1>) 2) n-X-R) (II) and optionally a blocking agent, where the number average molecular weight of (II) is 200-3000 g/mole and an average hydroxyl functionality of >= 1.8; and subsequently dispersing inorganic particles having an average dynamic light scattering in an emulsion, an average particle size (Z average) of less than 200 nm and optionally surface modified. In formula (I) Q : isocyanate reactive group, preferably urethane, urea or thiourea; X : hydrolyzable group, preferably alkoxy- or hydroxy; Y 1>alkyl, preferably 1-4C-alkyl; Z : 1-12C-alkylene, preferably 1-4C-alkylene; and a : 1-3, preferably 1 or 2. In formula (II) X : 1-10C-aliphatic residue, preferably CH 3(preferred), C 2H 5, n-propyl, isopropyl, n-butyl, isobutyl, tert.butyl, Si-[-[O-CH 2-CHZ] n-O-] or ([-CH 2-O-(CH 2) r]-Si-); Z : H (preferred) or CH 3; n : 1-12, preferably 1-5; r : 1-4, preferably 3; R : hydroxy functional carboxylic acid ester group of formula -C(=O)-(CH 2) x-OH or -CH(OH)Y 1>; x : 3-5, preferably 5; Y 1>-CH 2-N(R 2>)(R 3>); R 2>H, CH 3, C 2H 5, n-propyl, isopropyl, cyclohexyl, 2-hydroxyethyl, 2-hydroxypropyl or 3-hydroxypropyl; R 3>2-hydroxyethyl, 2-hydroxypropyl or 3-hydroxypropyl; R 1>H or optionally heteroaromatic atom containing 1-10C-hydrocarbon, preferably phenyl or CH 3; and n : 1-40. An independent claim is included for the nanoparticle-modified polyisocyanate, obtained by the above process.