A silicone based polyether comprising a monovalent group R, with R having an average formula: wherein, Z is bonded to Si and -Z- is -CH 2 CH 2 - or -CH=CH-; R 1 and R 2 are independently alkyl, phenyl, an alkyl substituted phenyl, a phenyl substituted alkyl, one of the four latter groups substituted or further substituted by one or more of halogen, NO 2, NH 2 or an amine group whenever -Z- is -CH 2 CH 2 -, or R 1 and R 2 are independently H, halogen, NO 2, NH 2, an amine group, alkyl, phenyl, an alkyl substituted phenyl, a phenyl substituted alkyl, one of the four latter mentioned groups substituted or further substituted by one or more of halogen, NO 2, NH 2 or an amine group whenever -Z- is -CH=CH-, and regardless of choice of -Z-, R 1 and R 2 may be independently aldehyde, keto or ester functional; R 3 is a divalent hydrocarbon group which may be substituted by one or more of halogen, NO 2, NH 2 or an amine group, or R 3 is absent; R 4 is -CH(R 5)-CH 2 -, -CH 2 -CH(R 5) - or a combination of these; R 5 is H, methyl, ethyl, phenyl or may vary among these within the same molecule in any proportion or order, with the proviso that when -Z- is -CH 2 CH 2 -, R 1 and R 2 are free of halogen and nitrogen, and all R 5 groups are solely some combination of H and methyl, then -CH 2 CH 2 -groups must make up on average at least 60 percent by weight of the total R 4 groups per molecule; m = 3 to 100 with the proviso that the range for m is expanded to 1 to 100 whenever -Z- is -CH 2 CH 2 - and the equivalent polydispersity of R is less than 1.4 or whenever R contains halogen, NO 2, NH 2, an amine group, or is aldehyde, keto or ester functional; R 6 is H, an alkyl group or and R 7 is an alkyl group, whereby the equivalent polydispersity of R is less than 1.6 and the equivalent polydispersity is the polydispersity of the corresponding polyether determined using GPC with a differential refractometer in THF. Z is bonded to Si and -Z- is -CH 2 CH 2 - or -CH=CH-; R 1 and R 2 are independently alkyl, phenyl, an alkyl substituted phenyl, a phenyl substituted alkyl, one of the four latter groups substituted or further substituted by one or more of halogen, NO 2, NH 2 or an amine group whenever -Z- is -CH 2 CH 2 -, or R 1 and R 2 are independently H, halogen, NO 2, NH 2, an amine group, alkyl, phenyl, an alkyl substituted phenyl, a phenyl substituted alkyl, one of the four latter mentioned groups substituted or further substituted by one or more of halogen, NO 2, NH 2 or an amine group whenever -Z- is -CH=CH-, and regardless of choice of -Z-, R 1 and R 2 may be independently aldehyde, keto or ester functional; R 3 is a divalent hydrocarbon group which may be substituted by one or more of halogen, NO 2, NH 2 or an amine group, or R 3 is absent; R 4 is -CH(R 5)-CH 2 -, -CH 2 -CH(R 5) - or a combination of these; R 5 is H, methyl, ethyl, phenyl or may vary among these within the same molecule in any proportion or order, with the proviso that when -Z- is -CH 2 CH 2 -, R 1 and R 2 are free of halogen and nitrogen, and all R 5 groups are solely some combination of H and methyl, then -CH 2 CH 2 -groups must make up on average at least 60 percent by weight of the total R 4 groups per molecule; m = 3 to 100 with the proviso that the range for m is expanded to 1 to 100 whenever -Z- is -CH 2 CH 2 - and the equivalent polydispersity of R is less than 1.4 or whenever R contains halogen, NO 2, NH 2, an amine group, or is aldehyde, keto or ester functional; R 6 is H, an alkyl group or and R 7 is an alkyl group, whereby the equivalent polydispersity of R is less than 1.6 and the equivalent polydispersity is the polydispersity of the corresponding polyether determined using GPC with a differential refractometer in THF.