Unsaturated copolymers, processes for preparing the same, and compositions containing the same
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United States of America Patent
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Oct 30, 2001
Grant Date -
N/A
app pub date -
Jul 20, 1998
filing date -
Jul 18, 1997
priority date (Note) -
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Abstract
Unsaturated copolymer which is a copolymer of an .alpha.olefin of 2 to 12 carbon atoms and a conjugated diene monomer represented by the following formula (I-a) and has the properties: (a) in said copolymer, 1,2-addition units (including 3,4-addition units) derived from the conjugated diene monomer (I-a) form double bonds in the side chain of the copolymer, 1,4-addition units derived from the conjugated diene monomer (I-a) form double bonds in the main chain of the copolymer, and the quantity ratio of the double bonds of the side chain derived from the 1,2-addition units to the double bonds of the main chain derived from the 1,4-addition units (side chain double bonds derived from 1,2-addition units/main chain double bonds derived from 1,4-addition units) is in the range of 10/90 to 99/1 (b) five-membered rings are present in the main chain of said copolymer; and (c) the quantity ratio of the double bonds from all of the addition units to the five-membered rings (total of double bonds from all addition units/five-membered rings) is in the range of 20/80 to 90/10; ##STR1## wherein R.sup.2 is a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group.
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