JP3383003B2 - Filter body for cigarette smoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a filter for cigarette smoke using a specific polyvinyl alcohol resin as a binder. 2. Description of the Related Art Tobacco smoke filters conventionally used are formed by winding a crimped cellulose, in particular, a non-woven fabric or creep paper formed from a bundle of cellulose acetate fibers or pulverized pulp, and winding it into a rod. It is manufactured by wrapping it in wrapping paper, or by molding ground pulp into a bulky sheet using a binder and winding it up into a bar as described above. When a nonwoven fabric or a sheet is formed into a rod shape, a binder is used, and a binder mainly comprising a vinyl acetate emulsion and / or a small amount of a polyvinyl alcohol-based resin (hereinafter abbreviated as PVA) is known. [0003] However, recently, protection of nature and beautification have been strongly demanded due to environmental problems. In a filter using such a binder, butts, especially a filter, have been used in a city due to throwing away tobacco or the like. In many cases, a state where the light is scattered in a groove or the like is seen. [0004] Therefore, it can be said that it is a demand of the times to devise such a filter body that it is disintegrated and dispersed by rainwater or the like and becomes a single fiber or powder and flows away. The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, have found that the average degree of polymerization is 500 to 2000 and the average degree of saponification is 93 to 99.5 mol%.
The present inventors have found that a tobacco smoke filter obtained by binding a cellulose material using a PVA-based resin aqueous solution as a binder can achieve the object, and completed the present invention. Hereinafter, the present invention will be described specifically. In the PVA-based resin of the present invention, the average degree of polymerization is 500 to 200.
0, preferably about 1000 to 1800 is useful.
When the average degree of polymerization is 500 or less, the adhesive strength is insufficient.
If it is more than 00, the viscosity of the aqueous solution is so high that workability is problematic. Furthermore, it is essential that the average degree of saponification is 93 to 99.5 mol%, preferably 96 to 99 mol%. At a saponification degree of 93 mol% or less, the balance between disintegration by water and disintegration by saliva is impaired. If it is 99.5 mol% or more, it does not collapse into rainwater. The PVA-based resin used in the present invention can be produced by any method. Usually, it is produced by polymerizing vinyl acetate in methanol and saponifying the obtained polyvinyl acetate. The polyvinyl acetate resin is saponified to a desired average degree of saponification in the usual manner under an alkali or acid catalyst to obtain the binder of the present invention. During the production of polyvinyl acetate, monomers copolymerizable with vinyl esters, for example, olefins such as ethylene, propylene, isobutylene, α-octene, α-dodecene, α-octadecene, acrylic acid, methacrylic acid, crotonic acid, Unsaturated acids such as maleic acid, maleic anhydride and itaconic acid or salts thereof, mono- or dialkyl esters, etc., nitriles such as acrylonitrile, methacrylonitrile, amides such as acrylamide, methacrylamide, ethylenesulfonic acid, allylsulfonic acid , Olefinsulfonic acids such as methallylsulfonic acid or salts thereof, alkyl vinyl ethers, N-acrylamidomethyltrimethylammonium chloride, allyltrimethylammonium chloride, dimethyldiallylammonium chloride, etc. Compounds having a cationic group, a vinyl ketone, N
Polyoxyalkylene (meth) allyl ethers such as vinylpyrrolidone, vinyl chloride, vinylidene chloride, polyoxyethylene (meth) allyl ether, polyoxypropylene (meth) allyl ether, polyoxyethylene (meth) acrylate, polyoxypropylene ( Meta)
Acrylate, polyoxyethylene (meth) acrylamide, polyoxypropylene (meth) acrylamide,
Polyoxyethylene (1- (meth) acrylamide-
A small amount of polyoxyalkylene allylamine such as (1,1-dimethylpropyl) ester, polyoxyethylene allylamine and polyoxypropylene allylamine, and polyoxyalkylene vinylamine such as polyoxyethylene vinylamine and polyoxypropylene vinylamine may be used in combination. However, the combination monomer is not necessarily limited to this. [0008] To produce the filter body of the present invention, spraying an aqueous solution of the PVA-based resin to the nonwoven fabric or paper cellulosic, coating may be immersed. The amount of binder used is 0.5-1
0% is appropriate. The concentration of the aqueous PVA resin solution is 2 to 7% by weight.
Is practical. If necessary, known auxiliaries such as softeners, fragrances, preservatives, bactericides, etc. may be mixed in such a filter. Further, other known binders such as starches, vinyl acetate resin emulsions, and PVA-based resins other than the present invention may be used in combination without departing from the spirit of the present invention. Any material may be used as the cellulose material, and examples thereof include pulp, cellulose acetate, linter, cotton, hemp, viscose rayon, and copper ammonium rayon. Also, if necessary, polyvinyl alcohol fiber,
Various synthetic fibers such as polyolefin fibers, polyamide fibers, and polyethylene terephthalate fibers are also used. The present invention provides a filter for cigarette smoke, which is used as a binder comprising a specific aqueous PVA resin solution . The present invention will be described below more specifically with reference to examples. 4 g of PVA having an average degree of polymerization of 1800 and an average degree of saponification of 98 mol% was dissolved in 100 g of water. This was spray-added to a cellulose acetate-based nonwoven fabric (thickness: 2 mm) at a ratio of 5% by weight in terms of solid content. This nonwoven fabric was packed in a filter paper wrapping paper having an inner diameter of 7.9 mm and a length of 17 mm, and left at 90 ° C. for 1 hour. The molded body was cut into a length of 17 mm to form a filter, which was then joined to a tobacco portion obtained by removing the filter from cherry (manufactured by Japan Tobacco Inc.). The tobacco connected to the filter was used under a standard condition (flow rate 17.5 ml / sec, smoking time 2) using a constant flow rate type smoker.
(sec / time, smoking frequency 1 time / min, smoking length 50mm)
Let me smoke. After the end of smoking, the amount of tar and nicotine adhering to the filter and the amount of tar and nicotine adhering to the Cambridge filter for smoker smoke component collection were measured,
When the removal rate of the filter was determined, the tar removal rate was 47%,
The nicotine removal rate was 40%. Next, when the above filter was put into 100 g of water at 30 ° C., the filter collapsed after 30 minutes, and cellulose acetate was dispersed in the water. Examples 2 to 3 PVA having an average degree of polymerization of 600 and an average degree of saponification of 99 mol%,
And P having an average degree of polymerization of 1100 and an average degree of saponification of 95 mol%.
The same experiment as in Example 1 was performed except that VA was used. In each case, the tar removal rate was 45% and the nicotine removal rate was 39%, and the filter was dispersed in water within 30 minutes. The filter for cigarette smoke using the specific aqueous polyvinyl alcohol resin solution of the present invention as a binder disintegrates and disperses in rainwater or the like, and flows off as single fibers or powder. It has the effect of not causing environmental pollution.

Claims (1)

(57) [Claims 1] A cellulose-based material is bound by using a polyvinyl alcohol-based resin aqueous solution having an average degree of polymerization of 500 to 2,000 and an average degree of saponification of 93 to 99.5 mol% as a binder. Filter body for cigarette smoke.