Butene-1 (co)polymers having low isotacticity

C - Chemistry – Metallurgy – 08 – F

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C08F 10/08 (2006.01) C08L 23/18 (2006.01)

Patent

CA 2584395

Butene-1 (co)polymers characterized by the following properties: content of butene-1 units in the form of isotactic pentads (mmmm) from 25 to 55%; intrinsic viscosity [.eta.] measured in tetraline at 135~C from 1 to 3dL/g; content of xylene insoluble fraction at 0~C from 3 to 60%; and a ratio ES2/ES1>=1, where ES1 is the boiling diethyl ether soluble fraction determined on the polymer as such and ES2 is the boiling diethyl ether soluble fraction determined after milling the polymer. The butene-1 (co)polymers show a good balance between processability and elastomeric behavior.

L'invention concerne des (co)polymères de butène-1 caractérisés par les propriétés suivantes: le contenu d'unités butène-1 sous la forme de pentades isotactiques (mmmm) est compris entre 25 et 55 %; la viscosité intrinsèque [?] mesurée dans la tétraline à 135 °C est comprise entre 1 et 3dL/g; le contenu de fraction insoluble dans le xylène à 0 °C est compris entre 3 et 60 %; et un rapport ES2/ES1=1, dans lequel ES1 représente la fraction soluble d'oxyde de diéthyle en ébullition déterminée sur le polymère en tant que tel et ES2 est la fraction soluble d'oxyde de diéthyle en ébullition déterminée après broyage du polymère. Les (co)polymères de butène-1 présentent un bon équilibre entre leur aptitude à la transformation et leur comportement élastomère.

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