Organosiloxane polymers and treatment of fibres therewith

Claim 1

Organosiloxanes represented by the general formula ##STR10## wherein Q represents a divalent group attached to silicon through a silicon to carbon bond and selected from hydrocarbon groups, groups composed of carbon, hydrogen and oxygen and groups composed of carbon, hydrogen and sulphur, each R represents a monovalent hydrocarbon group having less than 19 carbon atoms, at least 50 percent of the total R groups being methyl, each R' represents a hydrogen atom, an alkoxy or alkoxyalkoxy group having less than 7 carbon atoms, a monovalent hydrocarbon group having less than 19 carbon atoms or the group --QCOOH, except that R' may not represent a monovalent hydrocarbon group or the group --QCOOH when a is 0, R" represents a hydrogen atom or an alkoxy or alkoxyalkoxy group having less than 7 carbon atoms, a is 0 or an integer, b is 0 or an integer and c is an integer having a value up to a+b+c+2/3, there being present in the molecule at least two silicon-bonded substituents selected from the hydrogen atom, alkoxy groups having less than 7 carbon atoms and alkoxyalkoxy groups having less than 7 carbon atoms.