Patent ID: 7597831

Claim:
A solution casting method for producing a multilayered film having a cellulose acylate layer including cellulose acylate and additives, and a matting agent layer including matting agents, said cellulose acylate and said additives, said solution casting method comprising the steps of: sending a first dope forming said cellulose acylate layer to a casting die through a first pipe; sending a second dope forming said matting agent layer to said casting die through a second pipe; adding dilute liquid to said second dope using a dilute liquid supply device provided to said second pipe; stirring a mixture of said dilute liquid and said second dope using a first inline mixer provided to said second pipe; adding matting liquid including said matting agents and said cellulose acylate to said second dope using a matting agent supply device provided to said second pipe at downstream from said first inline mixer; stirring a mixture of said matting liquid and said second dope using a second inline mixer provided to said second pipe; casting said first dope and said second dope such that said first dope and said second dope are layered on a running support to form a casting film having said matting agent layer and said cellulose acylate layer; peeling said casting film from said support to be a wet film; and drying said wet film to be said multilayered film.