Emulsions of organopolysiloxanes having acidic and basic groups and the production thereof

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 CH3C6H4SO2—, C6H5SO2—, CH3SO2—, CCl3SO2—, ClSO2—, and mixtures thereof,
• 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 elastomer-like 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═.

A method for producing 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 CH3C6H4SO2—, C6H5SO2—, CH3SO2—, CCl3SO2— and ClSO2—, and mixtures thereof.
• 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 group in (2) are used 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 in (1) or 0.1-10 mol of basic moderator(s) (3) are used per mole of amino group (—NH—) in (1),
• where, as reaction products (4a) from (1) and (2), organopolysiloxanes are obtained which have, as basic groups, primary and/or secondary amino groups (—NH—) and, as acidic groups, those of the formula X—NH—CO—N═, and which contain acidic or basic moderators (3).

The method of claim 1, wherein the primary and/or secondary amino groups in the organopolysiloxanes (1) are Si—C bonded groups A of the formula

• —R2—[NR3—R4—]gNHR3 (I)
• where
• R2 is a divalent linear or branched hydrocarbon radical having 1 to 18 carbon atoms,
• R3 is a hydrogen atom,
• R4 is a divalent hydrocarbon radical having 1 to 6 carbon atoms, and
• g is 0, 1, 2, 3 or 4, preferably 0, 1 or 2.