KR101059641B1 - Absorbent article comprising a fragrance-containing back sheet - Google Patents

Abstract

The present invention relates to an absorbent article comprising a back sheet (baffle) containing an unencapsulated fragrance. All kinds of fragrance may be contained in the back sheet, and preferred fragrances include lavender fragrance and self-defense fragrance. The back sheet of the present invention may be breathable or non-breathable in the form of a nonwoven, film or film / nonwoven laminate. An absorbent article containing a back sheet according to the present invention has the advantage that the fragrance does not adhere to the production line, other non-perfume products or wearer skin.

Air freshener, back sheet, lavender scent, self-defense, masterbatch

Description

An Absorbent Article Comprising a Fragrance-Containing Back-Sheet}

The present invention relates to an absorbent article comprising a fragrance containing back sheet (baffle).

Absorbent articles are products that absorb body fluids excreted by various physiological actions, and include diapers, training pants, adult incontinence products, absorbent underwear, feminine hygiene products, and lactation pads. Body fluids absorbed in absorbent articles generally contain an unpleasant odor, and many methods have been devised to remove them.

The most representative of these methods is the method of imparting a fragrance or deodorant to the absorbent article.

For example, Korean Patent Nos. 1996-15183 and 5,429,628 disclose absorbent articles in which encapsulated fragrances or deodorants are applied to an absorbent core or top sheet of an absorbent article.

U.S. Patent No. 5,591,146 discloses a sanitary napkin in which a microcapsule containing fragrance or deodorant is placed in an adhesive bond attached to a wearer's underwear, and the microcapsule is expelled when the open capsule covering the adhesive bond is removed to release the fragrance or deodorant. It is.

International patent application WO 98/51248 discloses an absorbent article in which a fragrance member containing encapsulated fragrance is attached to a back sheet.

However, the manufacturing process of the absorbent article should further include the step of encapsulating the fragrance or deodorant and imparting the encapsulated fragrance or deodorant, the problem that the encapsulated fragrance or deodorant is not evenly distributed in the manufactured absorbent article have. In addition, since the perfume or deodorant is included in the absorbent core or the upper sheet, there is a problem that the perfume or deodorant is in contact with the wearer's skin.

It is therefore an object of the present invention to provide a fragrance-containing absorbent article without the above conventional problems.

The absorbent article according to the invention is characterized in that the fragrance is contained in the back sheet and is not encapsulated.

Hereinafter, the absorbent article according to the present invention will be described.

The absorbent article according to the present invention is an absorbent article composed of a liquid permeable top sheet, an absorbent core, and a liquid impermeable back sheet like a general absorbent article, and contains an air freshener not encapsulated in the back sheet.

The fragrance used in the present invention is generally a floral bouquet mixed with all the fragrances used in the art, for example, single floral type, single floral type, such as lavender fragrance, aroma, rose fragrance, jasmine, etc. Bouquet type, Citrus type such as lemon and orange, Oriental type such as musk, anba, and sapphire, Green or Woody type, Aliphatic aldehyde type and other incense etc. Of these, a single floral anti-corrosion agent such as lavender, self-cleaning or rose fragrance is preferable.

Specific examples of the lavender fragrance fragrance composition among the fragrances used in the present invention are as follows.

Lavender Oil 40-60 wt%, Linalool or Linalol Oxide 10-30 wt%, Citronellol 5-10 wt%, Isobornyl Acetate 10-20 wt%, Calm 5-10 wt% of formaldehyde.

Of these ingredients, camphor acts to strengthen the lavender fragrance somewhat.

In addition, lavender fragrance fragrance composition of 25 to 40% by weight of linalyl acetate, 40 to 60% by weight of Lavandin Oil, 5 to 15% by weight of linalol or linalol oxide and 0.01 to 5% by weight of lemon oil Can be used in

The composition of the self-directed fragrance among the fragrances used in the present invention is as follows.

Cinnamic acid aldehyde 30-55%, ethyl linalol 10-30%, iso eugenol 10-30%, linalol 10-30%, terpineol 10-30%, phenyl ethyl alcohol 5-15 weight%.

The back sheet according to the invention, in the form of a film, a nonwoven and a film / nonwoven laminate, first describes a back sheet in the form of a film according to the invention.                     

The back sheet in the form of a film according to the present invention is cast or expanded after mixing a masterbatch (hereinafter referred to as a perfume-containing masterbatch) prepared by blending the fragrance with a thermoplastic polymer forming a backsheet matrix, followed by a general baffle masterbatch. It can be prepared using film extrusion, or other suitable film-forming technique, but it is suitable in terms of maintaining fragrance persistence by preparing by casting through a T-die at about 170-240 ° C., preferably about 180-230 ° C. Do.

The manufacturing method of the back sheet of the film form which concerns on this invention via this T-die is as follows.

First of all, the fragrance-containing masterbatch and the baffle masterbatch are mixed in the desired ratio, introduced into the extruder, melted and mixed, and then fine dispersion is induced through the screen pack device inside the T-die to remove foreign substances. Thereafter, the film is cast through a T-die die. The cast film is passed through a cooling roll. At this time, it is suitable to maintain the temperature of the roll to 10 ~ 30 ℃, preferably 15 ~ 25 ℃ lower than the general roll temperature (20 ~ 35 ℃, preferably 25 ~ 30 ℃) in order to maintain the fragrance persistence Do. The back sheet in the form of a film according to the invention can then be produced by cutting and winding the film according to the desired width. Moreover, the corona treatment or the embossing process which is a general back sheet process can be given to such a manufacturing process as needed.

The fragrance-containing masterbatch used in the present invention has a composition of 30-50% thermoplastic polymer, 1-20% fragrance and 40-60% additive, and the baffle masterbatch has a composition of 40-60% thermoplastic polymer and 60-40% additive. Have The additive in the fragrance-containing masterbatch and the baffle masterbatch may be various additives depending on desired properties such as antioxidants, filler particles and dyes.

Each thermoplastic polymer of the fragrance-containing masterbatch and the baffle masterbatch may be the same or different, and such thermoplastic polymers include ultra low density polyethylene (VLDPE), low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, ethylene and Propylene-based polymers comprising copolymers of C ₃ -C ₁₂ alpha-olefins, copolymers of propylene and ethylene and / or C ₄ -C ₁₂ alpha-olefins and both atactic and isotactic propylene units in the polypropylene backbone Soluble polyolefins, elastomers such as polyurethanes, copolyether esters, polyamide polyether block copolymers, ethylene vinyl acetate copolymers, copoly (styrene / ethylene-butylene), styrene-poly (ethylene-propylene ) -Styrene, styrene-poly (ethylene-butylene) -styrene, polystyrene / poly (ethylene-butylene) / poly Alkylene, a poly (styrene / ethylene-butylene / styrene) and the like, but the general formula ABA 'or AB block copolymer having a like, are not limited.

When the two kinds of masterbatch are mixed, the baffle masterbatch and the fragrance-containing masterbatch may be mixed at a desired ratio, but generally about 99: 1 to 40:60 wt. %, Preferably from about 96: 4 to 80: 20% by weight. Therefore, the amount of perfume applied is suitably about 0.01 to 12% by weight, preferably about 0.05 to 5% by weight, based on the total weight of the back sheet.

The film thus prepared may be used as the back sheet in the present invention, but the film prepared by casting the baffle masterbatch containing the filler particles such as CaCO ₃ together with the perfume-containing masterbatch is preheated, stretched and heat fixed. A film provided with breathability by being uniaxially or biaxially stretched through three steps of can be used as the back sheet in the present invention. At this time, the stretching process is carried out through the first and second, the stretching temperature is set in consideration of the evaporation and decomposition of the fragrance, about 20 ~ 70 ℃, preferably about 40 ~ 45 ℃ suitable, elongation rate is about 160 250%, preferably about 180-220% are suitable. The heat fixation process takes place at 20 to 100 ° C., preferably about 70 ° C. or less, taking into account evaporation and decomposition of the fragrance.

The elongated film should have a thickness that enables structural integrity and liquid impermeability. The film after stretching should have a thickness of about 50-300 microns, preferably about 100 microns.

In addition, the back sheet according to the present invention is a spunbond, meltblown, thermal-bonded carded web prepared by a conventional method using the baffle masterbatch and perfume-containing masterbatch described above, Through-air bonded carded web, spunlace, spunbond-meltblown-spunbond (SMS) or spunbond-meltblown-meltblown-spunbond ( SMMS), preferably a nonwoven fabric of spunbond-meltblown-spunbond or spunbond-meltblown-meltblown-spunbond.

In addition, the back sheet according to the present invention laminates the fragrance-containing film with a general nonwoven fabric using an adhesive such as solvent type glue, hot melt adhesive or cold glue, or heat bonding. Or a laminate of the perfume-containing nonwoven fabric with a general film or a laminate of the perfume-containing film and the perfume-containing nonwoven fabric. At this time, the application amount of the perfume applied is about 0.01 to 12% with respect to the weight of a film / nonwoven laminated body.

The liquid permeable top sheet and absorbent core in the present invention are used in conventional absorbent articles, wherein the top sheet which can be used in the present invention is a porous foam, a networked foam, a perforated plastic film, a nonwoven fabric, a natural fiber, a synthetic fiber or a natural It can be made from a wide variety of materials such as blends of fibers and synthetic fibers. For example, the top sheet may consist of a spunbond fibrous web of spunlace nonwovens or polyolefin fibers or a bonded carded web composed of natural fibers and / or synthetic fibers. In this regard, the top sheet may be composed of hydrophobic materials treated with a surfactant or otherwise treated to impart the desired level of wettability and liquid permeability. Examples of top sheets are described in US Pat. No. 5,879,343, US Pat. No. 5,490,846, US Pat. No. 5,364,382, and US Patent Application No. 09 / 209,177 and the like.

Absorbent cores used in the present invention may include one or more absorbents such as superabsorbent particles, wood pulp fluff fibers, synthetic weed pulp fibers, synthetic fibers, and combinations thereof. The absorbent core may be of various shapes, the size of which depends on the desired absorbent capacity, the desired use of the absorbent article, and other factors known to those skilled in the art. In the present invention, the absorbent core may not be included.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

≪ Example 1 >

Lavender Oil 48%, Linalool 22%, Citronellol 8%, Isobornyl Acetate 12%, Camphor 10% Lavender fragrance 10%, Low Density Polyethylene 40% and 50% mixture of antioxidant tris (2,4-di-tert-butylphenyl) phosphate and tetrakis (methylene 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate methane 15% by weight of the fragrance-containing masterbatch made up with 85% by weight of the baffle masterbatch consisting of 8% low density polyethylene, 39.3% linear low density polyethylene, 51% CaCO ₃ and 1.7% TiO ₂ and then at about 200 ° C. through a T-die. Casting produced a film.

The film thus prepared was uniaxially stretched at an elongation rate of about 200% at an elongation temperature of about 40 ° C. to produce a film for breathable back sheet.

The pantiliner was manufactured using the film thus prepared as a back sheet.

<Example 2>                     

After preparing a film for breathable back sheet in the same manner as in Example 1 except that a lavender fragrance fragrance consisting of linalyl acetate 30%, ravandine oil 40%, linalol 15% and lemon oil 5% as a perfume This film was used to make a pantiliner.

<Example 3>

Example 1 except that a self-directed fragrance consisting of 40% cinnamic acid, 15% ethyl linalol, 15% iso eugenol, 15% linalol, 10% terpineol, and 5% phenyl ethyl alcohol was used as a fragrance. In the same manner, a film for breathable back sheet was prepared, and then a panty liner was prepared using this film.

The absorbent article according to the present invention does not have a problem on the wearer's skin by including the perfume in the back sheet, and there is no need for a separate process of applying the perfume to the absorbent article. In addition, the fragrance is imparted to the product with the advantage that the fragrance is long-lasting can increase the appeal to the product.

Claims (21)

The unencapsulated fragrance is uniformly contained in the back sheet rather than the absorbent core or the top sheet, A film prepared by mixing the rear sheet with the baffle masterbatch containing the perfume-containing masterbatch; Nonwoven fabrics prepared by mixing perfume-containing masterbatches with baffle masterbatches; The fragrance-containing masterbatch and the baffle masterbatch are put into an extruder and melt-blended and cast at 170 to 240 ° C. through a T-die, and then passed through a cooling roll at 10 to 30 ° C. to prepare an adhesive or thermal adhesive film. Film / nonwoven laminate prepared by laminating with nonwoven fabric using; And a film / nonwoven laminate prepared by laminating a nonwoven fabric prepared by mixing a fragrance containing master batch with a baffle masterbatch with a film using an adhesive or thermal bonding. delete 2. The back sheet according to claim 1, wherein the back sheet is melt-mixed by introducing the fragrance-containing masterbatch and the baffle masterbatch into an extruder, and then cast it at 170-240 ° C through a T-die, and then passes through a cooling roll at 10-30 ° C. Absorbent article which is a film produced by making. delete The absorbent article of claim 1 wherein the nonwoven is spunbond-meltblown-spunbond or spunbond-meltblown-meltblown-spunbond. delete delete The absorbent article according to any one of claims 1, 3 and 5, wherein the fragrance is applied 0.01 to 12% by weight relative to the total weight of the back sheet. The absorbent article according to any one of claims 1, 3 and 5, wherein the baffle masterbatch has a composition of 40 to 60% of a thermoplastic polymer and 60 to 40% of an additive. 10. The thermoplastic polymer of claim 9, wherein the thermoplastic polymer is very low density polyethylene (VLDPE), low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, copolymers of ethylene and C ₃ -C ₁₂ alpha-olefins, and ethylene and propylene and An absorbent article selected from the group consisting of copolymers of C ₄ -C ₁₂ alpha-olefins. 10. The absorbent article of claim 9 wherein the additive is selected from the group consisting of antioxidants, dyes, filler particles, and mixtures thereof. The absorbent article according to any one of claims 1, 3 and 5, wherein the composition of the perfume-containing masterbatch is 30-50% of the thermoplastic polymer, 1-20% of the perfume, and 40-60% of the additive. 13. The thermoplastic polymer of claim 12 wherein the thermoplastic polymer is a very low density polyethylene (VLDPE), a low density polyethylene (LDPE), a high density polyethylene (HDPE), polypropylene, a copolymer of ethylene and a C ₃ -C ₁₂ alpha-olefin, and ethylene and propylene and An absorbent article selected from the group consisting of copolymers of C ₄ -C ₁₂ alpha-olefins. The absorbent article of claim 12 wherein the additive is selected from the group consisting of antioxidants, dyes, filler particles, and mixtures thereof. The absorbent article of claim 1, wherein the composition ratio of the baffle masterbatch to the fragrance-containing masterbatch is 96: 4 to 80: 20% by weight. The absorbent article according to claim 1 or 3, wherein the cast film is stretched at an elongation of 160 to 250% at 20 to 70 ° C. 17. The absorbent article of claim 16 wherein the stretched film is heat set at 20-100 &lt; 0 &gt; C. 6. The absorbent article of claim 1, wherein the fragrance is a lavender fragrance or a self-defense fragrance. 19. The fragrance according to claim 18, wherein the fragrance is 40 to 60% by weight of Lavender Oil, 10 to 30% by weight of Linalool or linalol oxide, 5 to 10% by weight of citronellol, isobornyl An absorbent article as a composition of lavender fragrance consisting of 10 to 20% by weight of acetate and 5 to 10% by weight of camphor. The fragrance according to claim 18, wherein the fragrance is 25 to 40% by weight of linalyl acetate, 40 to 60% by weight of lavandin oil, 5 to 15% by weight of linalol or linalol oxide, 0.01 to lemon oil. An absorbent article which is a composition of lavender fragrance consisting of 5% by weight. The fragrance according to claim 18, wherein the fragrance is 30 to 55% by weight of aldehyde cinnamic acid, 10 to 30% by weight of ethyl linalol, 10 to 30% by weight of iso eugenol, 10 to 30% by weight of linalol, and 10 to 30% by weight of terpineol. %, 5-15% by weight of phenyl ethyl alcohol.