| abstract |
Processes for cationically polymerizing cationically polymerizable ethylenically unsaturated monomers in the presence of one or more Lewis acids, characterized in that polymerization is effected in the presence of one or more substituted alkenes of the formula (I) in which R<SUP>1</SUP> is H or C<SUB>1</SUB>-C<SUB>5</SUB>-alkyl, R<SUP>2</SUP> is C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl, X is halogen, OR<SUP>3</SUP> or OCOR<SUP>3</SUP>, in which R<SUP>3</SUP> is C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl. |