opolymer and the polyoxyalkylene blocks constitute about 70 to about 55 weight percent of the block copolymer; wherein the average molecular weight of each siloxane block ranges from about 1000 to about 3,500 and the average molecular weight of each polyoxyalkylene block ranges from about 2,000 to about 3,500; wherein x is an integer of at least 7; wherein y is an integer of at least 4; wherein d