Patent ID: 7789088

Claim:
A cigarette filter which comprises an airlaid nonwoven fabric that includes cellulosic fibers and an aqueous based polymer binder, said binder having one or more polymer compositions and one or more stabilizing agents, where the stabilizing agent is present in amounts of from 1 to 15 parts per hundred weight monomer content of the polymer composition, and wherein the nonwoven fabric comprises in the range of about 30 to about 2 parts by dry weight of the binder and in the range of about 70 to about 98 parts by dry weight of the fibers and other filling components; the cigarette filter having a construction further characterized in that the fabric from which it is made has a basis weight (grams per square meter) in the range of about 40 to about 70 gsm, caliper in millimeters in the range of about 0.7 to about 1.5 millimeters, and a dry strength in the Machine direction (MD) in Newtons per 5 cm in the range of about 5 to about 25 N/5 cm at a tensiometer separation speed of 100 millimeters per minute.