| abstract |
An ester-amide block copolymer of the formula (1):n nwherein R is an aromatic hydrocarbon group with 6-20 carbonnatoms and G is a polyorganosiloxane residue, said copolymernhaving a weight average molecular weight of 30,000 - 1,000,000.nThis copolymer is prepared by polycondensing an activated acylnlactam-terminated aromatic amide with a diol by a bulknpolymerization procedure in a molten state. |