Process for preparing organopolysiloane gels

A process for producing organopolysiloxane gels, comprising:

• reacting
• (1a) unsaturated organopolysiloxane resins comprising units of the formulae
• SiO2(Q units) and
• R3SiO1/2 and R2R1SiO1/2(M units),
• where
• R each independently is a monovalent, optionally substituted hydrocarbon radical having 1 to 18 carbon atoms per radical,
• R1 each independently is a monovalent hydrocarbon radical onto which Si-H groups are optionally added in a hydrosilylation reaction,
• with the proviso that the organopolysiloxane resins contain at least 2 R1 radicals, and that the molar ratio of M units to Q units is in the range from 0.5 to 4.0, the organopolysiloxane resins optionally containing, in addition to the M and Q units, small amounts of RSiO3/2 (T) units and/or R2SiO2/2 (D) units, in amounts of 0.01 to 20 mol %, based on the sum total of all siloxane units, the organopolysiloxane resins optionally containing up to 10% by weight of Si-bonded hydroxyl or alkoxy groups,
• and optionally
• (1b) compounds having a polar organic group and a hydrosilylatable end group, with
• (2) a mixture of two Si-H-containing organopolysiloxanes which have different average chain lengths, of the formula:
• (R23-xHxSiO1/2) (R22SiO2/2)a(R2HSiO2/2)b(R23-xHxSiO1/2) (I)
• where R2 each independently is an unsubstituted or optionally heteroatom-substituted, aliphatic, cycloaliphatic or aromatic, optionally polycyclic, C1-C18 hydrocarbon radical,
• x is 0 or 1,
• a and b are each integers ≥0,
• with the provisos that the sum total of a+b ≥30, that the organopolysiloxanes contain an average of at least 2 Si-bonded hydrogen atoms, and that the long-chain organopolysiloxane has at least 3 times the chain length (a+b) of the short-chain organopolysiloxane,
• in the presence of
• (3) catalysts that promote the addition of Si-bonded hydrogen onto aliphatic multiple bonds,
• where (1a), optionally (1b) and (2) is/are dispersed in
• (4) diluents
• and the reaction is stopped by addition of
• (5) stopper compounds used as catalyst poisons.