Abstract: The present invention relates to a photopolymerization process comprising irradiating a photopolymerizable material with U.V. light of wave length 250 to 400 nm in the presence of a photosensitizing amount of a photoinitiator of formula I, ##STR1## in which R is hydrogen or halogenR.sub.1 is alkyl, cycloalkyl, benzyl, optionally substituted phenyl or (a) ##STR2## either R.sub.2 is optionally substituted alkyl, benzyl, C.sub.6 H.sub.5 --CH.dbd.CH--, 2-thienyl, 2-furyl, 2-(3-chloro)benzothienyl or optionally substituted phenyl, andR.sub.3 is hydrogen or R.sub.2 and R.sub.3 form a radical of formula (b) ##STR3## in which X is a direct bond, --O--, --S--, --CH.sub.2 --, ##STR4## and R.sub.4 and R' have one of the significances of R.sub.2 and R, respectively,with the proviso that when R.sub.1 is (a) R.sub.3 is hydrogen and R.sub.2 and R.sub.4 are free from halogen atoms.

Abstract: Flameproofing composition comprises an O,O,O-triester of phosphorus, phosphoric or thiophosphoric acid and a haloalkyl aryl ether, and optionally a chlorinated aliphatic hydrocarbon and/or an organic tin or lead compound. The composition is useful for flameproofing polymeric organic materials, especially synthetic polymeric organic materials such as polypropylene, which may alternatively be flameproofed by treatment separately with the individual components of the composition.

Abstract: The present invention concerns a novel method of flame-proofing flammable material which comprises treating said material with a compound of the formula: ##EQU1## WHEREIN N IS 1 OR 2, AND R, when n is 1, is a radical of the formula ##EQU2## wherein R.sub.1 and R.sub.2 are substituents e.g. alkyl, or R.sub.1 and R.sub.2, together with the nitrogen atom, form a heterocyclic ring or R, when n is 2, is a radical of the formula ##EQU3## wherein R.sub.1 and R.sub.4 are substituents e.g. alkyl and R.sub.3 is a hydrocarbon bridge e.g. alkylene, or R.sub.1, R.sub.2 and R.sub.4, together with the nitrogen atoms to which they are bound, form a heterocyclic ring, or a group of the formula ##SPC1##Wherein m is 1 to 5, and novel compounds (i.e. when n is 2) useful as flame-proofing agents.