| 摘要 |
A polymer composition containing polyurethane polymer chains including at least first segments having a polysiloxane group of weight average molecular weight greater than about 10,000 daltons pendant to the polyurethane polymer chain backbone, wherein (i) the polymer composition further comprises polyurethane polymer chains including second segments having a polysiloxane group of weight average molecular weight less than about 6,000 daltons either pendant to the polyurethane polymer backbone or a part of the polyurethane polymer backbone or (ii) the polymer composition further comprises a polysiloxane polymer additive of weight average molecular weight of less than about 6,000 daltons which is not pendant to a polyurethane polymer backbone or a part of a polyurethane polymer backbone. The polymer composition has a weight average molecular weight of at least 10,000 daltons and a sufficient number of acid groups to provide an acid number greater than 20.
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