Patent ID: 9155335
Filing Date: 2015-10-13
Classification: A24D

Abstract:
1. A degradable cigarette filter where said cigarette filter includes a filter element of a bloomed cellulose acetate tow, the cellulose acetate having a degree of substitution in the range of 2.0 to 2.6, and a plug wrap surrounding said filter element comprising: a coating composed of a mixture of a water-soluble matrix material and a material adapted to catalyze hydrolysis of said cellulose acetate tow being selected from the group consisting of an acid, an acid salt, and combinations thereof, said mixture having a weight ratio of the material to catalyze hydrolysis of said cellulose acetate tow to said water-soluble matrix in the range of 0.75-4.0:1, said coating being applied to the plug wrap after the tow is manufactured, whereby water dissolves said matrix material and exposes said material adapted to catalyze hydrolysis to said tow, and said material adapted to catalyze hydrolysis degrades said tow.