Acylthiourea oligomers suitable as redox initiator components and radically polymerizable compositions comprising them

An acylthiourea oligomer according to Formula (I)

• wherein:
• R1 is a branched or a linear C1-C16 alkanediyl group that can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or —C(O)NH— groups;
• or
• a C4-C16 cycloaliphatic group that can be unsubstituted or substituted by one or more substituents selected from branched or linear C1-C20 alkyl groups and can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or —C(O)NH— groups;
• or
• a combination of the branched or the linear C1-C16 alkanediyl group and the C4-C16 cycloaliphatic group;
• or
• a C7-C20-alkylaryl group that can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or —C(O)NH— groups, and/or can be unsubstituted or substituted by one or more substituents selected from branched or linear C1-C20 alkyl groups, branched or linear —O—C1-C12 alkoxy groups, ester groups —C(O)O—R8, where R8 is a branched or linear C1-C20 alkyl group, and/or acyl groups —C(O)—R9, where R9 is a branched or linear C1-C20 alkyl group;
• R2, R4 are, independently of each other, hydrogen or a methyl group;
• R3 is a branched or linear C1-C12 alkyl group that can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or —C(O)NH— groups and/or can be substituted by one or more functional groups;
• or
• a C4-C16 cycloaliphatic group that can be unsubstituted or substituted by one or more substituents selected from branched or linear C1-C20 alkyl groups that can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or C(O)NH— groups;
• or
• a C4-C10 aryl or heteroaryl group, which can be unsubstituted or substituted by one or more substituents which are selected from branched or linear C1-C20 alkyl groups, —O—C1-C12 alkoxy groups, ester groups —C(O)O—R10, where R10 is a branched or linear C1-C20 alkyl group, a C6-C10 aryl group or a C7-C20-alkylaryl group, and/or acyl groups —C(O)—R11, where R11 is a branched or linear C1-C20 alkyl group, a C6-C10 aryl group or a C7-C20-alkylaryl group and/or can be interrupted by one or more S atoms or O atoms;
• or
• a C5-C20-alkylaryl or C5-C20-alkylheteroaryl group that can be interrupted by one or more S atoms, O atoms, —C(O)O— groups and/or —C(O)NH— groups, and/or can be unsubstituted or substituted by one or more substituents selected from branched or linear C1-C20 alkyl groups, branched or linear —O—C1-C12 alkoxy groups, ester groups —C(O)O—R12, where R12 is a branched or linear C1-C20 alkyl group, a C6-C10 aryl group or a C7-C20-alkylaryl group, and/or acyl groups —C(O)—R13, where R13 is a branched or linear C1-C20 alkyl group, a C6-C10 aryl group or a C7-C20-alkylaryl group;
• R5 is a phenyl or a —O(C═O)—CH3 group;
• m is an integer within a range from 1 to 100;
• p is an integer within a range from 0 to 100;
• q is an integer within a range from 0 and 100;
• m+p+q≥2 and wherein
• m/(m+p+q) is a value within a range from 0.1 and 1.0.