Polymeric substrate containing mercapto and sulfonic groups
AssigneeThe Dow Chemical Company
InventorsRichard M. Wehmeyer, Marlin E. Walters, Emmett L. Tasset
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Abstract
A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support; or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
Claims2
A catalytically-active material comprising an insoluble organic or inorganic support in which is incorporated a polystyrene resin having a mercaptosulfonic acid residue represented by the formula ##STR31## wherein B is a straight or branched chain alkylene bridging group, R and R.sup.1 are independently selected from H, alkyl or aryl, --C.sub.n H.sub.2n -- is straight or branched chain alkylene and n is an integer from 0 to 20.
Dependencies are inferred from the claim text.