Preparation of graft, block and crosslinked unsaturated polymers and copolymers by olefin metathesis

A crosslinking reaction wherein a mixture consisting

• A. a multicyclic multiolefin crosslinking comonomer possessing at least two interconnected unsaturated alicyclic rings that contain 4, 5, 7, 8, 9, 10 and 12 carbon atoms, and each of said rings possesses at least one --CH.dbd.CH-- grouping, and said multicyclic multiolefin being free of non-aromatic conjugation;
• and
• B. at least one alicyclic unsaturated compound selected from the group consisting of:
• 1. alicyclic compounds corresponding to the formula:
• ##STR12## wherein:
• a. Q is a fragment which comprises a sequence of at least 6 carbon atoms situated in linear succession between the methylidene carbons which constitute the double bond;
• b. the carbon atoms in the linear succession of Q may be interconnected by both carbon-carbon single bonds and carbon-carbon double bonds;
• c. any of the carbon atoms in the linear succession of Q may be substituted by at least one member from the group of alkyl, aryl, alkenyl, aralkyl, alkaryl, cycloalkyl, cycloalkenyl, bicycloalkyl and bicycloalkenyl radicals;
• d. any of said carbon atoms in the linear succession of Q may be constituents of aromatic rings and alicyclic rings;
• and
• e. said alicyclic unsaturated hydrocarbon contains no conjugated double bonds;
• and
• 2.