Polysiloxane modified polyisocyanate

• Main Authors: MECHTEL, MARKUS DR, KLIMMASCH, THOMAS, NIESTEN, MEIKE DR, NENNEMANN, ARNO DR
• Format: Patent
• Language: English; French; German
• Published: 13.05.2009
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Preparation of siloxane modified polyisocyanate comprises reacting polyisocyanate with hydroxyl group containing siloxane (I) and optionally a blocking agent, where the number average molecular weight of (I) is 200-3000 g/mole and an average hydroxyl functionality of >= 1.8. Preparation of siloxane modified polyisocyanate comprises reacting polyisocyanate with hydroxyl group containing siloxane of formula (R-X-Si(R 1>) 2-(O-Si(R 1>) 2) n-X-R) (I) and optionally a blocking agent, where the number average molecular weight of (I) is 200-3000 g/mole and an average hydroxyl functionality of >= 1.8. 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 siloxane group containing polyisocyanate obtained by the above process. Die vorliegende Erfindung betrifft neuartige modifizierte Polyisocyanate enthaltend hydroxyfunktionelle Polydimethylsiloxanbausteine sowie deren Verwendung in Beschichtungsmitteln und Klebstoffen.