Method for the production of hydroxyalkyl polysiloxanes

A process for preparing hydroxyalkylpolysiloxanes of the formula V

• (SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13Si1/2)q([O1/2SiR32—(CR42)b—OH]s[O1/2H]t (V),
• in which silanol-containing organosiloxanes of the formula VI
• (SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q[O1/2H]r (VI)
• are reacted with compounds comprising at least one unit of the formula IV
• —[O—(CR42)b—SiR32)n— (IV)
• where
• R1, R3, R4 are each a hydrogen atom or a monovalent C1-C20-hydrocarbon radical or C1-C,5-hydrocarbonoxy radical which may be unsubstituted or substituted by —CN, —NCO, —NRx2, —COOH, —COORx, halogen, acryl, epoxy, —SH, —OH or —CONRx2, in which one or more nonadjacent methylene units may be replaced by —O—, —CO—, —COO—, —OCO—, or —OCOO—, —S— or —NRx— groups and in which one or more nonadjacent methine units may be replaced by —N═, —N═N— or —P═ groups,
• Rx is hydrogen or a C1-C10-hydrocarbon radical which may be unsubstituted or substituted by —CN or halogen,
• b is at least 2,
• s is at least 1,
• r is at least 1,
• n is at least 2,
• s+t=r and k+m+p+q is at least 2.