o 0.95/0.05, Q is --R(R')a (R)b X wherein R is propyl, R' and R constitute a polyether made from oxyethyl, oxypropyl or a mixture of oxyethyl and oxypropyl groups to give a total molecular weight of 100 to 450, X is a methoxy group, and P is --R(R')c (R)d OH wherein R is propyl, and R' and R constitute a polyether made from oxyethyl, oxypropyl or a mixture of oxyethyl and oxypropyl groups to g