Size selective catalysis with ion exchange resins
AssigneeSun Chemical Corporation
InventorSteve Nahm
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Abstract
A method of preparing oligomeric compounds from polyfunctional reactants in the presence of heterogeneous catalysts that exhibit size selective characteristics, such that further reaction between first generation products or first generation products and reactants is less favored than between the starting reactants is disclosed. Preparation of oligomeric polyacrylate compounds in a liquid solution using these catalysts is also disclosed comprising reacting X—H acidic Michael donor compounds with unsaturated Michael acceptor compounds containing more than one unsaturated group.
Claims16
A method of preparing an oligomeric polyacrylate compound in a liquid solution comprising reacting an acidic X—H Michael donor compound containing at least one acidic X—H group with an unsaturated Michael acceptor compound containing one or more carbon to carbon unsaturated groups in the presence of a heterogeneous ion exchange catalyst that contains free basic anions and bound cations, and which exhibits size selective characteristics, wherein X is an atom independently selected from the group consisting of C, N, O, S and P, and the molar ratio of the acceptor groups to the donor groups is less than about 6, wherein said acidic X—H Michael donor compound has an acidic X—H group with a pKa of less than about 18.
Dependencies are inferred from the claim text.