imethyl polysiloxane compounds having from 3 to 6 silicon atoms, and mixtures thereof, whereinR is an [deleted: substituted or unsubstituted ]alkyl [deleted: or alkenyl ]group having from 19 to 21 [deleted: 35 ]carbon atoms or mixtures thereof,X is [deleted: -O- or ]-N(R5)-,R1 is a substituted or unsubstituted alkylene group having from 2 to 6 carbon atoms,R2, R3 and R4 are each independently an a