Processes for the preparation of thermotropic aromatic...

C - Chemistry – Metallurgy – 08 – G

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402/174, 402/177

C08G 63/64 (2006.01) C08G 64/06 (2006.01) C08G 64/16 (2006.01) C08G 64/22 (2006.01) C08G 64/30 (2006.01)

Patent

CA 1139040

PRECIS DE LA DIVULGATION: La présente invention concerne des polyesters carbonates thermotropes conformables de haute masse moléculaire. Ces copolyesters sont constitués d'unités de formules: (I) = ?O-R-O?a, ?O-R1-O?b; (II) = Image ; (III) = -CO-R2-CO- ; dans lesquelles: R représente un radical paraphénylène mono- substitué; R1 un radical paraphénylène non substitué; avec 0,3?a?1, 0?b?0,7, a + b = 1 ; R2 représente un radical aromatique ou cycloaliphatique divalent; la quantité des unités (II) dans le mélange (II) + (III) étant comprise entre 30 et 90 % et le rapport molaire des unités (I) par rapport à l'ensemble (II) + (III) étant comprise entre 0,95 et 1.05. Ces polyesters carbonates permettent d'obtenir des objets moulés, des fils et des films.

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