| 摘要 |
<p>Block copolymers of polyester resins obtained by reaction under polyaddition reaction in the solid state of different polyester resins in the presence of a bifunctional compound containing groups reactive with the COOH and/or OH groups of the polyester resin. The copolymers have formula X - A - Y wherein X and Y are different blocks of a polyester resin; A is an organic radical deriving in particular from a dianhydride of an aromatic tetracarboxylic acid.</p> |
