Patent ID: 8669340
Filing Date: 2014-03-11
Classification: C08G,C08J,C08L,C09D

Abstract:
1. A method for producing emulsions of organopolysiloxanes having basic and acidic groups, comprising: in a first step, reacting organopolysiloxanes (1) having primary and/or secondary amino groups (—NH—) with isocyanates (2) of the formula X—N═C═O, where X is an electron-withdrawing group selected from the group of the formulae CH in the presence of at least one acidic moderator (3) selected from the group consisting of carboxylic acids or at least one basic moderator (3) selected from the group consisting of tertiary amines, with the proviso that 0.01-0.9 mol of isocyanate groups in (2) are present per mole of amino group (—NH—) in (1) and that 0.1-10 mol of acidic moderator(s) (3) are used per mole of amino group (—NH—) in (1) or 0.1-10 mol of basic moderator(s) (3) are used per mole of amino group (—NH—) in (1), to produce reaction products (4a), and, in a second step: emulsifying the reaction products (4a) obtained in the first step which contain acidic or basic moderators (3), in water (7), optionally with emulsifiers (5) and optionally organic solvents (6) to form an aqueous emulsion (4b), where emulsions (4b) of organopolysiloxanes that are liquid at 25° C. and 1020 hPa and have a viscosity of from 100 Pa.s to 1,000,000 Pa.s (25° C.) or are elastomeric organopolysiloxanes are obtained, and where the organopolysiloxanes have, as basic groups, primary and/or secondary amino groups (—NH—) and, as acidic groups, groups of the formula X—NH—CO—N═.