ted urethane groups and the other isocyanate groups reacted to form pendant --QRf or --QRh groups, s is a number of at least 1 and can be 3 or higher, z is zero or a number of up to about 4, s+z is a number of about 4 or higher, and t is a number of at least about 10 and can be 40 or more. 3.