Carboxy functional polysiloxanes

The compounds I and II represent intermediates for the synthesis of either carboxy functional or amino functional polysiloxanes. To this end I or II is either saponified with sodium hydroxide and concomitantly polycon-densated to a poly(carboxylaIky1 methyl siloxane) (III) or reduced to an amino alkyl methyl dialkoxy silane with sodium borohydride (J 5). ... 

Aldehyde functionalities are very reactive toward amino and hydroxy groups. As a result, polymers 1 can bind to cellnlose or protein snrfaces. Their reactivity toward nucleophiles enables them to take part in varions crosshnking reactions, e.g. with amines. Carboxy fnnctional polysiloxanes 2 are also able to bind to surfaces because of the carboxy group s high polarity. They can nndergo crosslinking reactions, e.g. with epoxides. Their salts are good snrfactants. 

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