Abstract: Photosensitive polyaldehydes are provided which have the formula: ##STR1## WHEREIN R is a photosensitive end group selected from ##STR2## R.sup.1 is H or n-alkyl of 1-5 carbon atoms, preferably H, R.sup.2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR3## when R.sup.1 is H, and n is a positive integer of about 10-4000. The polyaldehydes are prepared by the anionic polymerization of the appropriate aldehyde with an initiating amount of an alkali metal or tetraalkylammonium alkoxide of RO in the above formula.The polyaldehydes are useful in articles and methods of relief imaging and in lithographic plates.

Abstract: Aqueous dispersions are disclosed containing up to 50% of particulate solids having a particle size less than 1.mu. and consisting essentially ofA. 4 parts by weight of particles of hydrous metal oxides such as silica, alumina or aluminum-modified silica, andB. from 1 to 16 parts by weight of particles of a polymer containing from 0.5% to 92% by weight of --CF.sub.3 groups, and preferably having a Knoop hardness of at least 5.The dispersions can be used to coat fabrics, painted surfaces and the like to enhance soil repellancy.