| 摘要 |
<p>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.</p> |
