Patent ID: 9386802
Filing Date: 2016-07-12
CPC Classification: A24D

Claim Text:
1. A cigarette filter comprising a composite particle and a cellulose ester tow, wherein the filter has a thickness retention of not less than 90% under a load of 300 g and has an air resistance of not more than 1500 mm WG at an air flow rate of 17.5 ml/second in a filter rod having a length of 100 mm and a diameter of 8 mm, wherein the composite particle comprises a cellulose acetate and at least one amino compound selected from the group consisting of an amino acid and an aminosulfonic acid, and the composite particle has a particle size whereby not less than 90% by weight of the composite particle pass through a sieve having an aperture size of 1.7 mm and fails to pass through a sieve having an aperture size of 0.10 mm, wherein the sieves are in accordance with JIS Z8801-1 2006, and wherein the cellulose acetate is a particle form, and the amino compound is supported on at least a surface of the cellulose acetate particle.