ALKYLPHENYLBISACYLPHOSPHINE OXIDES, THEIR MIXTURES, PHOTOPOLYMERIZABLE COMPOSITION CONTAINING THEREOF, METHOD OF PHOTOPOLYMERIZATION AND SUBSTRATE COVERED BY THIS COMPOSITION Russian patent published in 2002 - IPC

FIELD: organic chemistry. SUBSTANCE: invention relates to alkylphenylbisacylphosphine oxides of the formula (I): where R₁ means C₁-C₄-alkyl; R₂ means hydrogen atom, C₁-C₄-alkyl and R₃, R₄, R₅, R₆, R₇ mean independently each of other hydrogen atom or C₁-C₄-alkyl under condition that at least one or radicals R₃, R₄, R₅, R₆, R₇ does not mean hydrogen atom and under condition that: (iii) if R₁ and R₂ are methyl group or R₁ means methyl group and R₂ means hydrogen atom or R₁ means methyl group and R₂ means butyl group then R₃ and R₆ are not methyl groups; if R₁ and R₂ are methyl groups or R₁ means methyl group and R₂, R₃, R₄, R₆, R₇ mean hydrogen atom then R₅ does not mean methyl group; and their mixtures showing high photoinitiating capacity and to photopolymerisable composition containing these compounds and method of photopolymerization. EFFECT: improved method of photopolymerization, valuable properties. 10 cl, 4 tbl, 20 ex