groups capable of reacting with the organic resin particles containing a reactive halogen group and which silanes also contain a reactive group capable of reacting with the functional groups of the macromolecules the silane bonding agents of this invention preferably have the general formulae o u2550 c u2550 n cl 2 epoxy and vinyl and w is selected from clch 2 phenyl and wherein x has a value of from 1 to 6 and y has a value of 1 2 or 3 r is selected from the group consisting of an alkyl group of from 1 to 6 carbon atoms and the phenyl radical the most useful silane bonding agents for this invention are the silane bonding agents having the general formula is also one of the most preferred while the silane bonding agent having the general formula is highly preferred most preferred of this general formula is the silane bonding agent by way of example and with reference to fig3 wherein there is shown a schematic diagram of the incipient stages of the first process of this invention wherein there is shown step i the reaction of the solid particulate substrate depicted as sio 2 and a silane bonding agent depicted as e wherein the solid particulate substrate is illustrated as silica and the.