EP-4736674-A1 - FLAVOR INHALER FILTER, METHOD FOR PRODUCING SAME, AND FLAVOR INHALER

Abstract

A filter for a flavor inhaler, that comprises cellulose fibers and that has a high phenol filtration performance, is provided. A filter for a flavor inhaler, comprising: a filter medium that comprises a cellulose fiber-containing substrate, and a coating layer provided on the filter medium, and a wrapper wrapped around the filter medium; wherein the coating layer comprises a homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin.

Inventors

• AKAO, Takumi
• KUBOTA, HIROYUKI
• MURASAKI ABE, Yoko

Assignees

• Japan Tobacco Inc.

Dates

Publication Date

20260506

Application Date

20230627

Claims (18)

1. A filter for a flavor inhaler, comprising: a filter medium comprising a cellulose fiber-containing substrate and a coating layer provided on the substrate; and a wrapper wrapped around said filter medium; wherein the coating layer comprises a homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin.
2. The filter as claimed in claim 1, wherein the homopolymer or copolymer having an acetate ester group in a side chain is at least one selected from the group consisting of polyvinyl acetate, vinyl acetate-acrylic copolymers, and ethylene-vinyl acetate copolymers.
3. The filter as claimed in claim 1 or 2, wherein the filter further comprises a granulated substance, and the wrapper is wrapped around the filter medium and the granulated substance.
4. The filter as claimed in claim 3, wherein the granulated substance is at least one selected from the group consisting of activated carbon, hydrotalcite, and cellulose granules.
5. The filter as claimed in any one of claims 1 through 4, wherein the filter medium further comprises hydrophobic flavoring.
6. The filter as claimed in claim 5, wherein the hydrophobic flavoring is menthol.
7. The filter as claimed in any one of claims 1 through 6, wherein the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin is contained in a proportion of 1 to 20% by weight per 100% by weight of filter medium.
8. The filter as claimed in any one of claims 1 through 7, wherein the airflow resistance is 5 to 130 mmWG/27 mm tip.
9. The filter as claimed in any one of claims 1 through 8, wherein the concentration of the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin on the surface of the filter medium is higher than the concentration of the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin in the interior of the filter medium.
10. The filter as claimed in any one of claims 1 through 9, wherein the substrate is a cellulose fiber-containing sheet of paper or non-woven fabric.
11. A flavor inhaler comprising: a tobacco ingredient-containing tobacco rod; and the filter as claimed in any one of claims 1 through 10.
12. The flavor inhaler as claimed in claim 11, which is a combustion-type flavor inhaler.
13. The flavor inhaler as claimed in claim 12, wherein the airflow resistance of the filter is 50 to 130 mmWG/27 mm tip.
14. The flavor inhaler as claimed in claim 11, which is a heat-not-burn flavor inhaler.
15. The flavor inhaler as claimed in claim 14, wherein the airflow resistance of the filter is 5 to 50 mmWG/27 mm tip.
16. A method for producing a filter for a flavor inhaler, comprising: a step in which a cellulose fiber-containing substrate is prepared; a step in which a liquid that comprises water and a homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin is applied to, and dried on, the surface of the substrate to obtain a filter medium; and a step in which the filter medium is wrapped with a wrapper.
17. The method as claimed in claim 16, wherein the step for obtaining the filter medium is a step in which the liquid is sprayed and dried on the surface of the substrate.
18. The method as claimed in claim 16 or 17, wherein the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin is contained in a proportion of 1 to 60% by weight per 100% by weight of filter medium.

Description

TECHNICAL FIELD The present invention relates to a filter for a flavor inhaler, a method for producing the same, and a flavor inhaler. BACKGROUND ART Acetate fibers are commonly used as filter media in filters for flavor inhalers. However, cellulose fiber-containing filter media have been garnering attention because they are more biodegradable and more eco-friendly than acetate fibers. Cellulose fiber-containing filter media tend to have lower filtration performance when it comes to phenols, for example, and to result in a more acrid taste, than acetate fiber-containing filter media. Attempts have therefore been made to provide cellulose fiber-containing filter media with the capacity to filter phenols, for example, and afford better taste. It disclosed in PTL 1, for example, that the addition of polyalkylene glycol as a filter additive results in lower phenol levels. PTL 2 discloses the addition of triacetin, for example, as an additive for lowering phenol levels. On the other hand, it is disclosed in PTL 3 that fibers containing plant pulp are bound together with a water-soluble binder during the production of a non-woven fabric filter. CITATION LIST PATENT LITERATURE PTL 1: JP 2001-352963 APTL 2: JP 2021-515540 APTL 3: WO 2022/085072 SUMMARY OF INVENTION TECHNICAL PROBLEM An object of the present invention is to provide: a filter for a flavor inhaler, that comprises cellulose fibers and that has high phenol filtration performance; and a flavor inhaler comprising said filter. SOLUTION TO PROBLEM The present invention includes the following embodiments. [1] A filter for a flavor inhaler, comprising: a filter medium comprising a cellulose fiber-containing substrate and a coating layer provided on the substrate; anda wrapper wrapped around said filter medium;whereinthe coating layer comprises a homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin.[2] The filter as set forth in [1], wherein the homopolymer or copolymer having an acetate ester group in a side chain is at least one selected from the group consisting of polyvinyl acetate, vinyl acetate-acrylic copolymers, and ethylene-vinyl acetate copolymers.[3] The filter as set forth in [1] or [2], wherein the filter further comprises a granulated substance, and the wrapper is wrapped around the filter medium and the granulated substance.[4] The filter as set forth in [3], wherein the granulated substance is at least one selected from the group consisting of activated carbon, hydrotalcite, and cellulose granules.[5] The filter as set forth in any of [1] through [4], wherein the filter medium further comprises hydrophobic flavoring.[6] The filter as set forth in [5], wherein the hydrophobic flavoring is menthol.[7] The filter as set forth in any of [1] through [6], wherein the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin is contained in a proportion of 1 to 20% by weight per 100% by weight of filter medium.[8] The filter as set forth in any of [1] through [7], wherein the airflow resistance is 5 to 130 mmWG/27 mm tip.[9] The filter as set forth in any of [1] through [8], wherein the concentration of the homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin on the surface of the filter medium is higher than the concentration of the homopolymer or copolymer having an acetate ester or hydroxypropyl group in a side chain, cyclodextrin, or lecithin in the interior of the filter medium.[10] The filter as set forth in any of [1] through [9], wherein the substrate is a cellulose fiber-containing sheet of paper or non-woven fabric.[11] A flavor inhaler comprising: a tobacco ingredient-containing tobacco rod; and the filter as set forth in any of [1] through [10].[12] The flavor inhaler as set forth in [11], which is a combustion-type flavor inhaler.[13] The flavor inhaler as set forth in [12], wherein the airflow resistance of the filter is 50 to 130 mmWG/27 mm tip.[14] The flavor inhaler as set forth in [11], which is a heat-not-burn flavor inhaler.[15] [The flavor inhaler as set forth in [14], wherein the airflow resistance of the filter is 5 to 50 mmWG/27 mm tip.[16] A method for producing a filter for a flavor inhaler, comprising: a step in which a cellulose fiber-containing substrate is prepared;a step in which a liquid that comprises water and a homopolymer or copolymer having an acetate ester group or hydroxypropyl group in a side chain, cyclodextrin, or lecithin is applied to, and dried on, the surface of the substrate to obtain a filter medium; anda step in which the filter medium is wrapped with a wrapper.[17] The method as set forth in [16], wherein the step for obtaining the filter medium is a step in which the liquid is sprayed and dried on the surface of the substrate.[18] The method as set forth in [16] or [17], wherein the homopolymer or copolyme