Patent ID: 8822621

Claim:
A method for producing (hydroxymethyl)polysiloxanes of the general formula I (SiO 4/2 ) k (R 1 SiO 3/2 ) m (R 1 2 SiO 2/2 ) p (R 1 3 SiO 1/2 ) q [O 1/2 —(SiR 2 2 —X—Y—) a SiR 2 2 —CH 2 —OH] s [O 1/2 H] t formula I, which comprises reacting silanol-containing organosiloxanes of the general formula II (SiO 4/2 ) k (R 1 SiO 3/2 ) m (R 1 2 SiO 2/2 ) p (R 1 3 SiO 1/2 ) q [O 1/2 H] r formula II with cyclic or acyclic compounds which include at least one unit of the general formula III Z—[O—CH 2 —SiR 2 2 ] n —Y formula III where R 1 denotes a hydrogen atom or a cyclic or acyclic, linear or branched, aromatic or aliphatic or olefinic, saturated or unsaturated C 1 -C 20 hydrocarbon, C 1 -C 20 hydrocarbonoxy or C 4 -C 40 polyether moiety optionally substituted with Q 1 and optionally interrupted by one or more heteroatom-containing groups Q 2 , R 2 denotes a cyclic or acyclic, linear or branched aromatic or aliphatic or olefinic, saturated or unsaturated C 1 -C 20 hydrocarbon, C 1 -C 20 hydrocarbonoxy, C 4 -C 40 polyether or Si 1 -Si 20 siloxanyl moiety optionally substituted with Q 1 , optionally interrupted by one or more heteroatom-containing groups Q 2 or containing one or more heteroatom-containing groups Q 2 , Q 1 denotes a heteroatom-containing monovalent moiety, Q 2 denotes a heteroatom-containing divalent moiety or a heteroatom-containing trivalent moiety, Z represents hydrogen, a group X—SiR 2 2 —, or combines with Y to represent a bonding electron pair, X represents a group R 2 , a siloxane group or a bonding electron pair to Y or may be bonded to Y or X combines with Y to denote an oxygen atom or denotes an oxygen atom attached to Y, Y represents the meanings of R 2 or Q 1 or Q 2 or represents a siloxane moiety or a hydrolysable group inclusive hydroxyl or combines with Z to represent a bonding electron pair and may be attached to Z via X and may be interrupted by one or more optionally substituted siloxane groups or combines with X to denote an oxygen atom, with the proviso that Y in the case of n=1 denotes a hydrolysable group or a siloxane moiety which contains at least one hydrolysable group or combines with X to denote an oxygen atom or is attached to X or combines with Z to represent a bond, s represents values of at least 1, r represents values of at least 1, t represents values of at least 0, n represents values of at least 1, the sum s+t represents the value of r, k, m, p, q denote values not less than zero, with the proviso that the sum k+m+p+q denotes a sum of at least 2, a represents the value 0 or 1.