A process for preparing a copolycarbonate

C - Chemistry – Metallurgy – 08 – G

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C08G 81/00 (2006.01) C08G 64/18 (2006.01) C08G 77/448 (2006.01)

Patent

CA 2245316

A process for making a copolymeric resin is disclosed. Accordingly, component (a) and component (b) are introduced into an extruder under conditions designed to promote reactive blending therebetween in the presence of a transesterification catalyst. Component (a) is a wet aromatic polycarbonate resin containing moisture in an amount greater than 0.02 weight percent and having units conforming to (see fig. I) wherein D is a divalent residue of a dihydroxy compound. Component (b) is a lactone-siloxane block copolymer having structural units conforming to (see fig. II) wherein m is 1-90, n is 60-150, R is an alkyl or a phenyl radical, p is 2-12 and q is 2-20. Surprisingly, use of moisture-containing polycarbonate in the process yields a copolymer having good properties, although a corresponding process where the lactone-siloxane block copolymer reactant has a smaller number of repeating units yields inferior product.

Divulgation concernant la préparation d'une résine copolymérique. Selon l'invention, un constituant (a) et un constituant (b) sont introduits dans une extrudeuse dans des conditions devant permettre le mélange réactif entre eux, en présence d'un catalyseur de transestérification. Le constituant (a) est une résine de polycarbonate aromatique hydratée, renfermant plus de 0,02 % en poids d'eau et comportant des unités conformes à (voir fig. I), où D est un radical divalent d'un composé dihydroxylé. Le constituant (b) est un copolymère séquencé de lactone-siloxane, possédant des unités structurelles correspondant à (voir fig. II), où m est 1-90, n est 60-150, R est un radical alkyle ou phényle, p est 2-12 et q est 2-20. De façon surprenante, l'utilisation, dans le procédé, de polycarbonate renfermant de l'eau donne un copolymère possédant de bonnes propriétés, alors qu'un procédé analogue où le réactif copolymérique à séquence lactone-siloxane comporte un nombre moindre d'unités récurrentes et donne un produit inférieur.

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