This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. Address information for an integrity information area allocated in the first overrun extent in the volume space is recorded to a lead-in area reproducible by an optical disc drive. Subscribed to information is received from the second data processing system. Further, the method involves interrupting recording a lead-in area or a lead-out area at predefined splice points whenever a request for user data is made. Also, the turbine blade is much lighter than prior art blades. for 60 minutes; the fixing clamp is removed; and the hot-compressed urethane foam is taken out to obtain the intended sound-absorbing body.