Composition comprising at least one aromatic peroxide and at least one compound having an ether group

Composition comprising:

• a) at least one aromatic peroxide comprising at least one aromatic ring and at least one peroxo —O—O— function in its structure;
• b) at least one compound having an ether group of the following formula (V) or (VI):
• R1—(O—C2H4)n—O—R2 (V)
• or
• R1—(O—CH2—CH(CH3))n—O—R2 (VI)
• wherein:
• n represents an integer ranging from 1 to 8,
• R1 and R2 represent, independently of each other:
• a hydrogen atom, or
• a linear or branched alkyl C1-C8 alkyl radical, substituted or not, or
• R1 and R2 forming together an ether crown.