. . . "However other alphamonoolefms may be used including those of the formula CH =CHR where R is an alkyl radical having for example 1 to 12 carbon atoms (e.g., butene-l, pentene- 1, hexene-l, 4-methyIpentene-l, S-methylhexene-l, 4-ethylhexene-l, etc.)." .