Patent attributes
A polyether siloxane of formula (I)R1—Si(CH3)2—O—[-Si(CH3)2—O—]n—[-Si(CH3)R—O—]m—Si(CH3)2—R2 (I)whereR, R1 and R2 are the same or different,R in each occurrence is the same or different and represents —(CH2)x—O—(CH2—CR′R″—O)y—R′″,R′ and R″ are the same or different and each represent —H, —CH3, —CH2CH3 or phenyl,R′″ represents —H, alkyl or acyl,R1 and/or R2 each represent methyl or R,wherein the alkylene oxide units (CH2—CR′R″—O) within a polyether residue R can be the same or different and the polyether residues R within a polyether siloxane molecule of formula (I) can be the same or different, wherein on average (number average, averaged over all compounds of formula (I))n+m+2=>10 to 200,m=0 to 40 for R1 and/or R2 representing Ror m=1 to 40 for R1 and R2 representing —CH3,x=2 to 10,y=1 to 50,at least 25% of the R′″ radicals represent hydrogen and at least 50% of all polyether residues R which have an end group R′″=—H have a secondary or tertiary OH end group. The polyether siloxane has almost no primary but overwhelmingly secondary or tertiary OH groups.
