Abstract: A heat-curable, formaldehyde-free binding agent comprising a polyflavonoid type tannin and as a curing catalyst, a compound having a weak acid reaction curable at relatively high temperatures and compatible with cellulose containing materials such as wood chips for the production of particle boards.

Abstract: The present invention provides an allylic side chain-containing solid phase system, in which the allylic side chains are bound to a solid carrier material, of the general formula ##STR1## wherein F is a solid carrier material, R.sup.1 and R.sup.2, which can be the same or different, are hydrogen or halogen atoms or alkyl or aryl radicals, R.sup.3 is a linking grouping (spacer), X is a hydroxyl group, a halogen atom, a sulphonate or phosphonate group or an acyloxy radical, acyl in the acyloxy radical being the residue of an aliphatic carboxylic acid or the radical RCO--, R being an organic radical, which is bound via the carbonyl group, and n is the number of side chains bound to the carrier material.The present invention also provides processes for the preparation of these solid phase systems and is also concerned with the use thereof for solid phase reactions.