Cationically cross-linkable/polymerizable composition comprising an iodonium borate and releasing an acceptable odor

A composition P comprising:

• 1) at least one iodonium salt A of formula (I)′ below:
• wherein:
• the symbols R1 and R2 are identical or different, and each represent a linear or branched alkyl radical having from 10 to 30 carbon atoms
• a and b are integers such that 0≤a≤3, 1≤b≤4 and a+b=4,
• c and c′ are integers, which are identical or different, ranging from 1 to 5,
• the symbols X, which are identical or different, represent:
• a chlorine or fluorine atom with 0≤a≤3, or
• an OH function with 0≤a≤2, and
• the symbols R3, which are identical or different, represent:
• a phenyl radical substituted with:
• at least 2 halogen atoms, or
• at least one electron-withdrawing group selected from the group consisting of:
• —CF3, —OCF3, —NO2, —CN, —SO2—CnF2n+, —(CO)—CnF2n+1, —O—CnF2n+1 and —CnF2n+1, with n being an integer from 1 to 20, or
• an aryl radical containing at least two aromatic nuclei, optionally substituted with at least one halogen atom, or an electron-withdrawing group selected from the group consisting of:
• —CF3, —OCF3, —NO2, —CN, —SO2—CnF2n+, —(CO)—CnF2n+1, —O—CnF2n+1 and —CnF2n+1, with n being an integer from 1 to 20,
• 2) at least one hydrogen donor B selected from the group consisting of Guerbet alcohols of formula (II) below:
• wherein:
• the symbols R4 and R5 are identical or different, and each represent an alkyl radical having from 4 to 12 carbon atoms, and
• with the additional condition that the total number of carbon atoms of said Guerbet alcohol is from 10 to 20 carbon atoms, and
• 3) optionally at least one thermal stabilizer C.