Patent ID: 8158732

Claim:
A method for preparing a cyclic olefin addition polymer having a high gas permeability and a number average molecular weight (Mn) of 100,000 to 2,000,000 as determined by gel permeation chromatography relative to polystyrene standards, comprising addition polymerizing a cyclic olefin-functional siloxane represented by the following formula (1), or a mixture of the cyclic olefin-functional siloxane of the formula (1) and a cyclic olefin compound represented by the following formula (2) wherein R 1 may be the same or different and represents an aliphatic unsaturated bond-free monovalent organic group, s is an integer of 0 to 2 and j is 0 or 1, wherein A 1 to A 4 independently represent a group selected from a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an aryloxy group and a halogenated hydrocarbon group, or a polar group selected from an oxetanyl group and an alkoxycarbonyl group provided that A 1 and A 2 or A 1 and A 3 may form a alicyclic structure, an aromatic ring structure, a carbonimide or an acid anhydride group along with the carbon atoms bonded therewith, and i is 0 or 1, in the presence of a multi-component catalyst containing (A) a zero-valent palladium compound, (B) an ionic boron compound, and (C) a phosphine compound having a substituent group selected from an alkyl group having 3 to 6 carbon atoms, a cycloalkyl group and an aryl group, thereby obtaining a cyclic olefin addition polymer wherein a ratio of the structural units derived from the cyclic olefin-functional siloxane of the formula (1) is at 10 to 100 mole % of the addition polymer.