Diblock polyester copolymer and process for making

Details Diblock polyester copolymer and process for making Diblock polyester copolymer and process for making

C - Chemistry, Metallurgy

08

G

C08G 63/60 (2006.01) C08G 81/00 (2006.01) D01F 6/84 (2006.01)

Patent

CA 2284033

The present invention provides a diblock copolymer comprising: (a) a first block of polyester wherein said first block is made from aromatic polyester having: (i) an intrinsic viscosity which is measured in a 60/40 by weight mixture of phenol and tetrachloroethane and is at least about 0.6 deciliter/gram and (ii) a Newtonian melt viscosity which is measured by capillary rheometer and is at least about 7,000 poise at 280 ~C; and (b) a second block of polyester wherein said second block is made from lactone monomer. The diblock copolymer is useful in engineered materials, films, and in spinning fibers for industrial applications such as seat belts. A process for making the diblock copolymer uses a twin screw extruder for melting the aromatic polyester and mixing it with monomer.

La présente invention concerne un copolymère dibloc comprenant: (a) un premier bloc de polyester fait d'un polyester aromatique caractérisé par (i) une viscosité intrinsèque, mesurée au moyen d'un mélange à 60/40 en masses de phénol et de tétrachloroéthane, et revenant à au moins environ 0,6 dl/g, et (ii) une viscosité newtonienne à l'état fondu, mesurée au moyen d'un rhéomètre capillaire, et revenant à au moins environ 7.000 poises à 280 ·C; et (b) un second bloc de polyester fait d'un monomère de lactone. Ce copolymère dibloc convient particulièrement pour les matériels façonnés, les films, et la filature de fibres destinées aux applications industrielles telles que les ceintures de sécurité. L'invention concerne également un procédé de fabrication de ce copolymère dibloc utilisant une extrudeuse à deux vis pour faire fonde le polyester aromatique et le mélanger au monomère.

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