C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/24
C08G 77/06 (2006.01) C08G 77/16 (2006.01) C08G 77/34 (2006.01)
Patent
CA 1288889
A PROCESS FOR PREPARING DIORGANOPOLYSILOXANES HAVING TERMINAL SI-BONDED HYDROXYL GROUPS Abstract of the Disclosure A process for preparing diorganopolysiloxanes having terminal Si-bonded hydroxyl groups which comprises reacting an organosilicon compound selected from a cyclic diorganopoly- siloxane, a diorganodichlorosilane hydrolysis product and mixtures thereof with from 0.1 to 3 percent by weight of a diorganodichlorosilane, based on the weight of the organo- silicon compound, i.e., the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolysis product employed, in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compound and diorganodichlorosilane employed, to form dior- ganopolysiloxanes containing an Si-bonded chlorine atom in each of the terminal units, then treating the reaction mixture with water or an aqueous solution, separating off the aqueous phase from the diorganopolysiloxanes containing an Si-bonded hydroxyl group in each of the terminal units and thereafter removing the low boiling constituents by distillation.
585465
Braunsperger Karl
Stary Fridolin
von Au Gunter
Wegehaupt Karl-Heinrich
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Braunsperger Karl
Stary Fridolin
von Au Gunter
Wacker-Chemie G.m.b.h.
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