Absorbing article

An absorbent, article technology, applied in the direction of absorbent pads, etc., can solve the problems of non-durability, concealment, difficult to coat, etc.

Inactive Publication Date: 2009-09-02
KAO CORP
2 Cites 10 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] In the technique disclosed in Patent Document 1, the initially colored wetness indicator is discolored, and when the diaper surface has a pattern, there is a disadvantage of hiding or staining the pattern.
[0006] In the technology disclosed in Patent Document 2, since the colorless wetness indicator develops color by contact with body fluids, disadvantageous situations such as concealment or staining of the surface pattern of the diaper are less likely to occur. There is still room for im...
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Method used

According to the absorbent article of the present invention, since the hot melt composition uses the humidity indicator composition of the present invention containing the above-mentioned components (a) to (e), it can quickly excrete body fluids such as urine, feces, and blood. Notify diaper users. In addition, since the hot-melt composition can be selected from a wide range of colors and coating patterns when it changes color, it is possible to provide an absorbent article excellent in creativity at relatively low cost.
In addition, generally, when increasing the compounding amount of hydrophilic polymers such as polyalkylene glycol, then moisture resistance is reduced, but in the present invention, make pH indication by using appropriate amount of polyalkylene glycol Agents or acidic substances enter between it and the surfactant, so it can improve the moisture resistance instead.
The absorbent body 4 is formed by covering the liquid-retaining absorbent core 41 with the liquid-permeable covering sheet 42 . The absorptive core 41 contains absorbent materials such as pulp fibers and absorbent polymers, has a substantially elongated shape, and has a narrowed hourglass-shaped outline at the central portion in the longitudinal direction in a planar view. The absorptive core 41 is covered entirely with the cover sheet 42 except the both end surfaces in the longitudinal direction. The cover sheet 42 maintains its shape retention by covering the absorptive core 41, and can prevent the constituent components of the absorptive core 41, such as an absorben...
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Abstract

A wetness indicator composition contains (a) 0.1 % to 5% by weight of a pH indicator that is substantially colorless at pH 7 and develops a color in an acidic environment, (b) 20% to 90% by weight of a surfactant, (c) 5% to 55% by weight of a polyalkylene glycol, (d) 0% to 70% by weight of a polymer having a carboxyl group, and (e) 0.1% to 5% by weight of an acidic substance other than components (b) and (d). In an absorbent article including a topsheet 2, a backsheet 3, and an absorbent member 4 interposed between the topsheet 2 and the backsheet 3 and having applied thereon a hot-melt composition that changes color on contact with a body fluid, the wetness indicator composition is used as the hot melt composition.

Application Domain

Absorbent pads

Technology Topic

Body fluidPolymer +5

Image

  • Absorbing article
  • Absorbing article
  • Absorbing article

Examples

  • Experimental program(2)
  • Comparison scheme(6)

Example Embodiment

[0108] Example
[0109] Hereinafter, the present invention will be described in more detail through examples. However, the scope of the present invention is not limited by these Examples.
[0110] (Manufacturing method of humidity indicator composition)
[0111] The surfactant (b) and polyalkylene glycol (c) shown in Table 1 and Table 2 were added to a heat-resistant glass beaker equipped with a stirrer, and the contents were heated so as not to exceed 130°C. Stir well after melting. The polymer (d) having carboxyl groups is then added slowly. Finally, a pH value indicator (a) and an acidic substance (e) are added to prepare a humidity indicator composition.
[0112] Details of the pH indicator (a), surfactant (b), polyalkylene glycol (c), carboxyl group-containing polymer (d), and acidic substance (e) shown in Table 1 and Table 2 The situation is as follows.
[0113] [pH 7 and substantially colorless pH indicator (a) that develops color in an acidic region]
[0114] (a)-1: 3,6-bis(diethylamino)fluoran-γ-(4'-nitro)-anilinolactam (turns red in the acidic region)
[0115] (a)-2: 2-N,N-dibenzylamino-6-diethylaminofluoran (turns green in the acidic region)
[0116] (a)-3: 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide (turns blue in the acidic region)
[0117] [Surfactant (b)]
[0118] (b)-1: Polyoxyethylene alkylene alkyl ether (liquid at 23°C)
[0119] (b)-2: Polyoxyethylene polyoxypropylene glycol (liquid at 23°C)
[0120] (b)-3: polyoxyethylene lauryl ether (softening point: 70°C)
[0121] (b)-4: Alkylbenzylmethylammonium chloride (liquid at 23°C)
[0122] (b)-5: Special polycarboxylate polymer surfactant (liquid at 23°C)
[0123] [Polyalkylene Glycol (c)]
[0124] (c)-1: polyethylene glycol (molecular weight: 1000) (softening point: 37°C)
[0125] (c)-2: polyethylene glycol (molecular weight: 3000) (softening point: 53°C)
[0126] (c)-3: polyethylene glycol (molecular weight: 20,000) (softening point: 60°C)
[0127] (c)-4: Polypropylene glycol (molecular weight: 3000) (liquid at 23°C)
[0128] [Water-soluble raw material (c')]
[0129] (c')-1: polyvinyl alcohol (molecular weight: 3000) (liquid at 23°C)
[0130] [Polymer (d) having a carboxyl group]
[0131] (d)-1: EAA (MFR1300g/10min) (softening point: 75°C)
[0132] (d)-2: EAA (MFR300g/10min) (softening point: 82°C)
[0133] (d)-3: EMAA (MFR300g/10min) (softening point: 80°C)
[0134] (d)-4: EMMA (MFR450g/10min) (softening point: 90°C)
[0135] [Polymer (d') having no carboxyl group]
[0136] (d')-1: EVA (MFR400g/10min) (softening point is 70°C)
[0137] (d')-2: SIS (MFR40g/10min)
[0138] [Acidic substances (e) other than (b) and (d)]
[0139](e)-1: Citric acid
[0140] (e)-2: Succinic acid
[0141] (e)-3: Acetic anhydride
[0142] (Evaluation method of humidity indicator composition)
[0143] The following tests (1) to (6) were performed in the following order. The humidity indicator composition melted at 110°C was coated at 20 g/cm using a hand coater. 2 A coating amount of 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 As the back sheet, a commercially available Kao Merries moisture-permeable sheet (nonwoven fabric laminated on one side) was used.
[0144] (1) softening point
[0145] The softening point was measured by a softening point test method based on the ring and ball method of JIS (JAPAN Industrial Standard) K 6863-1944.
[0146] (2) Measuring method of viscosity
[0147] The measuring method of the viscosity is based on JIS K 6862 (A method). Add 300 g of the hot-melt composition for metal cans previously melted at a temperature 10°C higher than the measurement temperature into the test container, and stir thoroughly with a rod thermometer in the air to reach the measurement temperature, then use a B-type viscometer (Toki TOKIMEC VISCOMETER MODEL (manufactured by Sangyo Co., Ltd.: BM) was used for measurement (as the rotor used, an appropriate rotor was used as needed).
[0148] (3) Determination of discoloration time
[0149] The discoloration time refers to the time until the color development can be confirmed when the prepared test piece is wetted under certain conditions. Immerse the test piece in ion-exchanged water, measure the time from colorless to the time when color development can be confirmed, and use this as the color change time. The case of within 10 seconds is marked as ◎, the case of within 60 seconds is marked as ○, and the case of 60 seconds or more The case was marked as △, and the case where no color was developed for more than 1 hour was marked as ×.
[0150] (4) Determination of moisture resistance
[0151] Moisture resistance is to confirm the presence or absence of color development at the time of standing in a relative humidity of 40° C. and 80% RH. The case of no color development after 48 hours was designated as ○, the case of no color development by 24 hours but color development before reaching 48 hours was designated as △, the case of color development before reaching 24 hours was designated as ×, and Make a note.
[0152] (5) Evaluation of initial color tone
[0153] The initial color tone refers to the color tone of the test piece before being wetted with water. Judgment was performed in three grades of ○, Δ, and × from the state judged to be colorless to the state of color development.
[0154] (6) Test method for color rendering
[0155] The initial color tone refers to the color tone of the test piece before being wetted with water. Judgment was performed in three grades of ○, Δ, and × from the state judged to be colorless to the state of color development.
[0156]
[0157]
[0158] Examples and comparative examples were produced as shown in Table 1 and Table 2. As shown in Examples 1 to 3, by using a pH indicator (a) that has a lactone ring and has a pH value of 7 and is substantially colorless and develops color in an acidic region, it is possible to produce various Color humidity indicator composition.
[0159] In Examples 4 to 7, various surfactants (b) can be used to prepare a humidity indicator composition. In this case, the anionic surfactant has slightly weaker color development, and the cationic surfactant has a slightly darker initial color tone, but the nonionic surfactant can be used favorably without the above-mentioned problems. In particular, polyoxyethylene alkyl ethers are preferred.
[0160] In Examples 8 to 10, various polyalkylene glycols (c) can be used to prepare a humidity indicator composition.
[0161] In Examples 11 to 13, various polymers (d) having carboxyl groups can be used to prepare humidity indicator compositions. In particular, an example using an olefin-acrylic acid copolymer showed excellent performance.
[0162] In Examples 14 and 15, various acidic substances (e) other than (b) and (d) can be used to prepare the humidity indicator composition. In particular, an acidic substance that is solid at 23° C. is also colorless in the initial stage, which is preferable.
[0163] Examples 16 and 17 are examples of changing the compounding ratio of the pH indicator (a) which has a pH of 7 and is substantially colorless and develops color in an acidic region. When the compounding amount is not in the range of 0.5 to 2.5% by weight, although the initial color tone and color rendering property are slightly worse than the case where the compounding amount is in this range, it can be used without any problem.
[0164] Examples 18 and 19 are examples in which the compounding ratio of the surfactant (b) was changed. When the compounding amount is not in the range of 45 to 65% by weight, although the initial color tone or color rendering property is slightly worse than the case where the compounding amount is in this range, it can be used without any problem.
[0165] Examples 20 and 21 are examples in which the compounding ratio of polyalkylene glycol (c) was changed. When the compounding amount is not in the range of 10 to 20% by weight, although the moisture resistance is slightly worse than the case where the compounding amount is in this range, it can be used without any problem.

Example Embodiment

[0166] Example 22 is an example of changing the compounding ratio of the polymer (d) having a carboxyl group. When the compounding amount is not in the range of 20 to 60% by weight, the initial color tone is slightly worse than when the compounding amount is in this range, but it can be used without any problem.
[0167] Examples 23 and 24 are examples in which the compounding ratio of the acidic substance (e) other than (b) and (d) was changed. When the compounding amount is not in the range of 0.5 to 1.5% by weight, although the initial color tone and color rendering property are slightly worse than the case where the compounding amount is in this range, it can be used without any problem.

PUM

PropertyMeasurementUnit
Softening point70.0°C
Softening point37.0°C
Softening point53.0°C

Description & Claims & Application Information

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