Method for making polymer blends by using series reactors

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 297/08 (2006.01) C08F 10/00 (2006.01) C08F 210/18 (2006.01) C08L 23/10 (2006.01) C08L 23/14 (2006.01) C08L 23/16 (2006.01) C08F 4/659 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2319778

This invention relates to a method of making polymer blends using series reactors and a metallocene catalyst. Monomers used by the invention are ethylene, a higher alpha-olefin (propylene most preferred), and optionally, a non-conjugated diene (ethylidene norbornene, i.e., ENB, most preferred). More specifically, this invention relates to making blends of EP (ethylene- propylene) copolymers in which the blend components differ in any of the following characteristics: 1) composition, 2) molecular weight, and 3) crystallinity. We use the terminology EP copolymer to also include terpolymers that contain varying amounts of non-conjugated diene. Such terpolymers are commonly known as EPDM.

Procédé de préparation de mélanges polymères à l'aide de réacteurs en série et d'un catalyseur métallocène. Les monomères utilisés selon la présente invention sont l'éthylène, une alpha-oléfine supérieure (idéalement du propylène) et éventuellement une diène non conjuguée (idéalement de l'éthylidène norbornène - ENB). Plus spécifiquement, la présente invention concerne la préparation de mélanges de copolymères EP (éthylène-propylène) dans lesquels les constituants du mélange diffèrent pour ce qui est de n'importe laquelle des caractéristiques suivantes: (1) composition, (2) poids moléculaire et (3) cristallinité. Nous utilisons le terme copolymères EP pour désigner également les terpolymères qui contiennent des quantités variables de diène non conjuguée. Ces terpolymères sont couramment connus sous le sigle EPDM.

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