Process for preparing alternating copolymer of conjugated vinyl compound and olefinic unsaturated compound with oxygen and boron compound

Claim 1

In a process for preparing an alternating copolymer by copolymerizing an olefinic unsaturated compound having the formula ##STR7## wherein R I and R II are independently hydrogen, a halogen atom, a hydrocarbon radical having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon radical having 1 to 20 carbon atoms, and a conjugated vinyl compound selected from the group consisting of acrylonitrile and compounds having the formula, ##STR8## wherein Y is a member selected from the group consisting of ##STR9## NR'R" and R groups, and halogen and hydrogen atoms; Z' is an oxygen or sulfur atom; R is a hydrocarbon or halohydrocarbon radical having 1 to 20 carbon atoms; R' and R" are the same or different groups selected from the group consisting of hydrogen atom and a hydrocarbon or halohydrocarbon radicals having 1 to 20 carbon atoms, and may be bonded to each other to form a morpholino, a pyrrolidino or a piperidino group; and Me' is an element from Groups I to II of the Mendeleev Periodic Table, where k is equal to the valency of Me', or an ammonium group, with a catalyst at a temperature of -150° to +100° C, the improvement which comprises effecting the copolymerization at a pressure up to 100 kg/cm 2 by contacting the monomers in the presence of oxygen present in an amount up to 100 mole percent based on said catalyst with said catalyst selected from the group consisting of (1) at least one organo-boron halide having the formula, BR'".sub.n X.sub.3-n wherein R'" is a hydrocarbon radical having 1 to 20 carbon atoms, X is a halogen atom, and n is 1 or 2, (2) a combination of at least two members selected from the groups having the following formulas, BR'".sub.n X.sub.2-n (a) wherein R'", X and n are as defined above, BR.sub.3.sup.IV (b) wherein R IV is a hydrocarbon radical having 1 to 20 carbon atoms, and BX'.sub.3 (c) wherein X' is a halogen atom, said catalyst being used in an amount of from 0.0005 to 10 moles per mole of said conjugated vinyl compound.