Composition (e. g. ink or varnish) which can undergo cationic and/or radical polymerization and/or crosslinking by irradiation, based on an organic matrix, a silicone diluent and a photoinitiator

Composition which can undergo cationic and/or radical polymerization and/or crosslinking by irradiation, preferably actinic irradiation and/or with (a) beam(s) of electrons, characterized in that it comprises:

• A. at least one polymerizable organic matrix and/or at least one partially polymerized organic matrix, comprising (co)monomers and/or (co)oligomers and/or (co)polymers chosen from those containing epoxy (α1) and/or acrylate (α2) and/or alkenyl ether (α3) and/or hydroxyl (α4) reactive functions (frA), with the exclusion of cycloaliphatic epoxides (α11);
• B. at least one silicone diluent with a reduced viscosity ηr at 25° C. of less than or equal to 200 mPa.s, preferably less than or equal to 150 mPa.s, and even more preferably less than or equal to 100 mPa.s, and comprising:
• at least one unit of formula (I):
• Z-Si[Parenopenst]R0[Parenclosest]aO(3-a)/2
• in which:
• a=0, 1 or 2,
• R0 is identical to or different from the radicals similar thereto with the same exponent and represents an alkyl, cycloalkyl, aryl, vinyl, hydrogeno or alkoxy radical, preferably a C1-C6 lower alkyl,
• Z is an organic substituent comprising at least one epoxy and/or acrylate and/or alkenyl ether and/or hydroxyl reactive function (frB), with the condition that at least a portion of the functions (frB) is of the same nature as at least a portion of the functions (frA) of the matrix A,
• and at least two silicon atoms,
• C. an effective amount of at least one cationic and/or radical photoinitiator,
• D. optionally, at least one photosensitizer,
• E. optionally, at least one pigment,
• F. optionally, at least one other additive.