Process for the production of methylpolysiloxane oxymethylene copolymers

Claim 1

THE PROCESS FOR THE PREPARATION OF METHYL-POLYUSILOXANE OXYMETHYLENE COPOLYMERS COMPOSED OF RANDONLY DISTRIBUTED SILOXANE UNITS SELECTED FROMTHE GROUP CONSISTING OF THE DIMETHYL-SILOXANE UNIT, THE DIMETHYL-OXYMETHYL-SILOXANE UNIT AND THE METHYL-OXYMETHYL-SILOXANE UNIT AND TERMINATED BY A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE HYDROXYL RADICAL AND THE TRIMETHYLSILOXANE UNIT WHICH COMPRISES REACTING (1) A LINEAR BROMINE SUBSTITUTED METHYL-POLYSILOXANE SELECTED FROM THE GROUP CONSISTING OF 1,3-DI-(BROMOMETHYL)-TETRAMETHYL DISILOXANE AND A HYDROXYL-TERMINATED POLYMER COMPPSED OF METHYL-BROMO-METHYLSILOXANE UNITS, THE LATTER HAVING BEEN OBTAINED BY TREATING METHYL-BROMOMETHYL-DICHLOROSILANE WITH AN EXCESS OF WATER, WITH (2) A METHYL POLYSILOXANE SELECTED FROM THE GROUP CONSISTING OF A CYCLIC DIMETHYL-SILOXANE POLYMER, A HYDROXYL-TERMINATED LINEAR DIMETHYL-SILOXANE POLYMER, AND A TRIMETHYLSIOXY TERMINATED LINEAR DIMETHYL-SILOXANE POLYMER, IN A PROPORTION OF FROM 1 TO 15 DIMETHYL SIOXANE UNITS PER BROMINE ATOM AND IN THE PRESENCE OF AT LEAST 1 MOL KOH PER GRAM ATOM BROMINE AT A TEMPERATURE ABOVE 0*C. AND RECOVERING THE COPOLYMER THEREBY FORMED.