Depolymerization of silicone polymers to obtain organopolysiloxanes

A method of preparing organopolysiloxanes OR, the method comprising conducting a reaction for depolymerization of at least one silicone S in the presence:

• of an acid catalyst chosen from benzenesulfonic acid derivatives of formula (VIa), alone or as mixtures:
• wherein either R1 and R2 represent a hydrogen atom and R3=CnH2n+1 where 5≤n≤20,
• or R1 and R3 represent a hydrogen atom and R2=CnH2n+1 where 5≤n≤20,
• or else R2 and R3 represent a hydrogen atom and R1=CnH2n+1 where 5≤n≤20,
• and of at least one chain blocker Bc having at least one siloxane function.