Patent ID: 7208560
Filing Date: 2007-04-24
Classification: C08G

Abstract:
1. A process for the preparation of urethane resins comprising the steps of providing a compound (a) having a hydrolyzable group selected from the group consisting of alkoxy and acetoxy groups directly bonded to 1 to 10 silicon atoms and having an organic group (I) selected from the group consisting of primary amino, secondary amino and acryloyl groups; providing a compound (b), wherein the compound (b) is selected from one of: acrylate, acryloylsilane compounds, monomaleimide, and maleic anhydride, wherein the compound (b) is capable of reacting with said organic group (I) of the compound (a); reacting the compound (a) with such an amount of the compound (b) as to produce a product (A) having said hydrolyzable group directly bonded to 1 to 10 silicon atoms, wherein the product (A) has a secondary amino group in one molecule, the number of secondary amino groups in one molecule being less than two; providing a polyisocyanate compound (compound (d)); providing a compound selected from the group consisting of: a polyol compound (compound (c)), a polythiol compound (compound (c-1)), and a compound (product (C)) having a number average molecular weight of 100–25000 and having at least 0.2 terminal secondary amino groups in one molecule, wherein said product (C) is obtained by reacting a compound (e) having an organic group (II) having a number average molecular weight of 100–25000 selected from the group consisting of amino and acryloyl groups, with a compound (f) being capable of reacting with said organic group (II) to form a secondary amine compound; reacting the polyisocyanate compound (compound (d)), with a compound selected from the group consisting of: the polyol compound (compound (c)), the polythiol compound (compound (c-1)), and the compound (product (C)), in order to produce a (thio)urethane pre-polymer (product (B)), wherein the product (B) has a terminal isocyanate group, the content of which is in an amount of 4% or less by weight of said product (B); and reacting said product (A) with said product (B) in such a proportion to produce a urethane resin having no isocyanate group.