Patent ID: 7015292

Claim:
A silicon-containing olefin copolymer comprising: (a) a constituent unit derived from —CH 2 —CH 2 —, (b) a constituent unit derived from —CH 2 —CHR— where R is a hydrocarbon group of 1 to 18 carbon atoms, and (c) a constituent unit represented by the following formula (I) wherein k is 0, 1 or 2, A is a hydrogen atom or a hydrocarbon group of 1 to 6 carbon atoms, B is a single bond or a hydrocarbon group of 1 to 20 carbon atoms, X, Y and Z are each independently selected from the group consisting of a hydrocarbon group of 1 to 6 carbon atoms, alkoxy group of 1 to 6 carbon atoms, acyloxy group, ketoximate group, amide group, acid amide group, aminoxy group, thioalkoxy group and amino group, at least one of X, Y and Z is selected from the group consisting of an alkoxy group of 1 to 6 carbon atoms, acyloxy group, ketoximate group, amide group, acid amide group, and aminoxy group; and having: (i) a molar ratio (a)/(b) of the constituent unit (a) to the constituent unit (b) of from 99/1 to 30/70, (ii) a content of the constituent unit (c) of from 0.1 to 10 mol % based on 100 mol % of the total amounts of the constituent units (a), (b) and (c), and (iii) a branching index of not less than 0.70.