PAPER SIZING ADDITIVES, THEIR PREPARATION PROCESS, AND THEIR USE

摘要

The present invention pertains to a process for the preparation of an alkenyl-substituted cyclic anhydride compound comprising the steps of subjecting one or more olefinically unsaturated C6 - C28 hydrocarbons of which at least 30% by weight is alpha-olefin to a double bond isomerization step by contacting them with a catalyst comprising an alkali metal on a carrier, and reacting the resulting isomehzed olefinic C6 - C28 hydrocarbons with a cyclic anhydride of an unsaturated dicarboxylic acid to form the alkenyl-substituted cyclic anhydride compound. Furthermore, it pertains to the thus obtained alkenyl-substituted cyclic anhydride and to its use as a paper additive.