Patent ID: 7868116

Claim:
A process for the production of high-molecular-weight siloxane polymers, comprising: in a first stage, reacting an OH-terminated substantially linear siloxane (1) of the formula HO(R 2 SiO) m (HRSiO) n H (I) with an organic compound (2) of the formula C f H 2f-2k-1 —Z (II) selected from the group of H 2 C═CR 3 —Z (2a), when k=0 and R 4 C≡C—Z (2b), when k=1, where R each is identical or different and is a monovalent optionally substituted hydrocarbon radical free from terminal aliphatic carbon-carbon multiple bonds, R 3 and R 4 , in each case independently of one another, are hydrogen or an alkyl radical having 1 to 20 carbon atoms, m is 0 or an integer from 1 to 1000, n is an integer from 1 to 200, the m+n units optionally randomly distributed in the molecule, Z is a monovalent hydrocarbon radical free from terminal aliphatic carbon-carbon multiple bonds which optionally contains one or more heteroatoms selected from the group consisting of oxygen, nitrogen, boron, silicon and titanium, or is a monovalent polymer radical having more than 20 carbon atoms, f is an integer from 2 to 22 and k is 0 or 1, and in a second stage, condensing the siloxanediols (3) obtained in the first stage and of the general formula HO(R 2 SiO) m ((Z—C f H 2f-2k )RSiO) n-o (HRSiO) o H (III) where o is 0 or an integer from 1 to 10, and is less than n.