Composition for wet indicator

Abstract

To provide a composition for wet indicator which is excellent in discoloration performance and is suppressed in odor. What is disclosed is a composition for wet indicator comprising: a hydrocarbon oil (A), at least one selected from saturated fatty acids having 16 or more carbon atoms and derivatives thereof (B), and a wet-sensitive colorant composition (C), wherein the component (B) is contained in an amount of 2 to 85 parts by mass based on 100 parts by mass of the total amount of the components (A) to (C).

Claims

1. A composition for wet indicator comprising: a hydrocarbon oil (A), at least one selected from saturated fatty acids having 16 or more carbon atoms and derivatives thereof (B), and a wet-sensitive colorant composition (C), wherein the component (B) is contained in an amount of 2 to 85 parts by mass based on 100 parts by mass of the total amount of the components (A) to (C).

2. The composition for wet indicator according to claim 1, wherein the component (B) contains at least one selected from 12-hydroxystearic acid and metal salts of the 12-hydroxystearic acid.

3. The composition for wet indicator according to claim 1, wherein the component (C) is a composition comprising a leuco dye or a pH indicator and an anionic surfactant or a nonionic surfactant.

4. The composition for wet indicator according to claim 3, wherein the anionic surfactant contains a linear alkylbenzene sulfonate.

5. A wet indicator having the composition for wet indicator according to claim 1.

6. An absorbent article having the wet indicator according to claim 5.

Description

EXAMPLES

[0086] Hereinafter, for the purpose of describing the present invention in more detail and specifically, the present invention will be described using examples, but these examples do not limit the present invention at all.

[0087] In Examples and Comparative Examples, components to be blended in a composition for wet indicator are shown below.

Hydrocarbon Oils

[0088] Paraffin oil (liquid paraffin (trade name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0089] Paraffin oil (Daphne Oil KP-68 (trade name) manufactured by Idemitsu Kosan Co., Ltd.) [0090] Paraffin oil (Diana Fresia PW-32 (trade name) manufactured by Idemitsu Kosan Co., Ltd.) [0091] Naphthenic oil (KNH4010 (trade name) manufactured by PetroChina Company Limited) [0092] Liquid polybutene (Nisseki Polybutene HV-100 (trade name) manufactured by JXTG Nippon Oil & Energy Corporation)

[0093] Colorants constituting the wet-sensitive colorant composition are as follows.

Colorants

[0094] pH Indicator (bromocresol green (trade name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0095] Leuco dye (crystal violet lactone (trade name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0096] Leuco dye (Blue 1 (trade name) manufactured by Yamada Chemical Co., Ltd.) [0097] Leuco dye (Blue 203 (trade name) manufactured by Yamada Chemical Co., Ltd.)

[0098] Surfactants constituting the wet-sensitive colorant composition are as follows.

Surfactants

[0099] Anionic surfactant (sodium dodecylbenzene sulfonate (reagent name) manufactured by KANTO CHEMICAL CO., INC.) [0100] Anionic surfactant (Aerosol QT-100 (trade name) manufactured by SOLVAY) [0101] Nonionic surfactant (SURFLIC-AQ250 (trade name) manufactured by Itoh Oil Chemicals Co., Ltd.)

Saturated Fatty Acids having 16 or More Carbon Atoms or Derivatives Thereof

[0102] Saturated fatty acid having 16 carbon atoms (16-hydroxyhexadecanoic acid (reagent name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0103] Saturated fatty acid derivative having 36 carbon atoms (magnesium stearate (reagent name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0104] Saturated fatty acid having 18 carbon atoms (12-hydroxystearic acid (reagent name) manufactured by FUJIFILM Wako Pure Chemical Corporation) [0105] Saturated fatty acid derivative having 18 carbon atoms (sodium stearate (reagent name) manufactured by FUJIFILM Wako Pure Chemical Corporation)

Tackifier Resin

[0106] Hydrogenated rosin-based tackifier resin (RHR-101HK (trade name) manufactured by Wuzhou Sun Shine Forestry & Chemicals Co., Ltd.) [0107] Hydrogenated rosin-based tackifier resin (Foral AX-E (trade name) manufactured by Eastman Chemical Japan Ltd.) [0108] Hydrogenated hydrocarbon-based tackifier resin (HD-1100 (trade name) manufactured by Tiajin Luhua Chemical Co., Ltd.) [0109] Hydrogenated hydrocarbon-based tackifier resin (ARKON P100 (trade name) manufactured by Arakawa Chemical Industries, Ltd.) [0110] Hydrogenated hydrocarbon-based tackifier resin (ECR5400 (trade name) manufactured by Exxon Mobil Corporation) [0111] Hydrogenated hydrocarbon-based tackifier resin (FTR-6100 (trade name) manufactured by Mitsui Chemicals, Inc.)

[0112] The above-described components were blended in ratios shown in Tables 1 to 4, and stirred and mixed to prepare a composition for wet indicator. Specifically, components were placed in a 70 ml container and heated to 130° C. with a glass-col heater, and a blend of the components was stirred using a stirrer at a stirring speed of from 300 to 500 rpm for 20 minutes. All numerical values relating to the composition for wet indicator (composition) shown in Tables 1 to 4 are parts by mass (solid content).

[0113] For the compositions for wet indicator of Examples and Comparative Examples, appearance was confirmed whether or not an oily gel was formed, and phase separation, odor, discoloration time and color bleeding were evaluated. Details of the evaluation are shown below.

Appearance

[0114] The compositions for wet indicator of Examples and Comparative Examples were allowed to stand at room temperature for 1 day, and appearance of each composition was visually observed to confirm whether or not an oily gel was generated.

[0115] Whether or not the composition for wet indicator was a gel was evaluated by fluidity of the composition and oozing-out of the oily substance.

[0116] The composition was placed in a container, the composition was not flowable even when the container was tilted, and a commercially available oil blotting paper was pressed against the composition, and when oil exudation was visually recognized, the composition was determined as a gel. The evaluation results are as shown in Tables 1 to 4.

[0117] Hardness of the composition for wet indicator was evaluated according to the following criteria. In an environment of 23° C., a cylindrical SUS probe was pressed against the composition for wet indicator of each of Examples and Comparative Examples to apply a load of 1 kg, and after 8 seconds, the degree of penetration of the SUS probe into the composition was confirmed to evaluate hardness of the composition. The evaluation criteria are as follows.

[0118] Penetration of probe having a diameter of 16 mm is 4 mm or more: Very soft

[0119] Penetration of probe having a diameter of 16 mm is less than 4 mm: Soft

[0120] Penetration of the probe having a diameter of 5 mm is less than 4 mm: Hard

[0121] Penetration of probe having a diameter of 3 mm is less than 4 mm: Very hard

Phase Separation

[0122] Using 30 g of the composition for wet indicator of each of Examples and Comparative Examples as an evaluation sample, 30 g of each sample was placed in a 70 ml glass container and allowed to stand in a heating furnace at 100° C. After aging the sample for 24 hours, the presence or absence of phase separation was visually confirmed to evaluate whether the composition was uniform or non-uniform.

[0123] A: No phase separation is observed, and no turbidity is observed

[0124] B: Phase separation is not observed and is uniform, but slight turbidity is observed

[0125] C: A slightly transparent supernatant is observed at the top

[0126] D: Obvious phase separation is observed

Odor

[0127] Using 30 g of the composition for wet indicator of each of Examples and Comparative Examples as an evaluation sample, 30 g of each sample was placed in a 70 ml glass container, covered with an aluminum foil, and then allowed to stand in a dryer at 40° C. for 1 hour. Thereafter, the container was taken out from the dryer, the aluminum foil was removed, and odor was confirmed. The evaluation criteria are as follows.

[0128] A: No odor is sensed

[0129] B: A slight odor is sensed

[0130] C: An obvious odor is sensed but is not unpleasant

[0131] D: A strong and unpleasant odor is sensed

Discoloration Test

[0132] The wet indicator composition of each of Examples and Comparative Examples was placed in a glass bottle, and the glass bottle was heated in a dryer at 100° C. until a uniform liquid was obtained. Subsequently, an appropriate amount of each composition was dropped on a hiding rate test paper (JIS K-5600, manufactured by TP Giken Co., Ltd.), then a uniform film having a thickness of about 27.5 μm was quickly prepared with a bar coater (No. 12 manufactured by Daiichi Rika Co., Ltd.), and color of this coating film was recorded as an initial state (sample). It is to be noted that, for a sample in which no coloration was observed, symbol “-” was shown in the table.

[0133] The sample was allowed to stand at room temperature for 30 minutes or more and then placed on a table, and water was sprayed on the sample. Thereafter, final color, the degree of hue change (color difference) and time until color oozed out and changed to the final color were recorded and described in Tables 1 to 4.

Color Difference (Degree of Hue Change)

[0134] Evaluation criteria of the hue change are as follows.

[0135] A: A very clear difference in hue is observed before and after spraying

[0136] B: A clear difference in hue is observed before and after spraying

[0137] C: A slight difference in hue is observed before and after spraying

[0138] D: No difference in hue is observed before and after spraying

Color Bleeding

[0139] After color of the sample changed to the final color, the water-applied sample was vertically leaned from a table, and color bleeding associated with moisture dripping was recorded. When the color oozes out due to water, application pattern of the wet indicator applied to a diaper collapses and visibility deteriorates. Therefore, it is preferable as the composition for wet indicator when the color bleeding is less. The evaluation criteria are as follows.

[0140] A: No color bleeding is observed

[0141] B: Slight color bleeding is observed, but shape of the applied portion is retained

[0142] C: Color bleeding is observed, but shape of the applied portion is retained

[0143] D: Color bleeding is observed, and shape of the applied portion is lost and not retained

Time Until it Became Final Color

[0144] Time from spraying of water until it became the final color was measured and described in Tables 1 to 4. It is to be noted that, for compositions in which no color difference was observed, symbol “-” was shown in the table.

TABLE-US-00001 TABLE 1 Examples 1 2 3 4 5 6 7 Component composition Hydrocarbon Paraffin oil (liquid paraffin) 66 8 20 0 0 83 81 oil Paraffin oil (KP-68) 0 0 0 0 0 0 0 Paraffin oil (PW-32) 0 0 0 63 34 0 0 Naphthene oil (KN4010) 0 0 0 0 0 0 0 Colorant pH Indicator (bromocresol 0 0 0 0 0 2 0 green) Leuco dye (crystal violet 1 2 0 0.4 1 0 2 lactone) Leuco dye (Blue 1) 0 0 0 0 0 0 0 Leuco dye (Blue 203) 0 0 2 0 0 0 0 Surfactant Anionic (Na dodecylbenzene 11 5 11 8 22 11 11 sulfonate) Anionic (Na dioctyl 0 0 0 0 0 0 0 sulfosuccinate) Nonionic (AQ250) 0 0 0 0 0 0 0 Saturated 16-Hydroxyhexadecanoic acid 0 0 0 0 0 0 0 fatty acid Mg stearate 0 0 0 0 0 0 0 12-Hydroxystearic acid 22 84 67 28 43 3 6 Na stearate 0 0 0 0 0 0 0 Tackifier Hydrogenated gum rosin 11 5 10 9 9 10 10 resin (RHR-101HK) Hydrogenated rosin (AX-E) 0 0 0 0 0 0 0 Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (HD-1100) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (P100) Hydrogenated hydrocarbon 0 0 0 20 45 0 0 (ECR5400) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (FTR-6100) Total 111 104 110 129 154 110 110 Composition applied sample Performance Appearance (presence or Presence Presence Presence Presence Presence Presence Presence evaluation absence of oily gel) of gel of gel of gel of gel of gel of gel of gel results Appearance (hardness of Hard Hard Hard Very hard Very hard Very soft Soft composition for indicator) Phase separation (100° C. A C A A A A A for 24 hours) Odor A A A A A B A Initial hue — Light blue Light blue — — Yellow — Hue (final color) after Blue Dark blue Dark blue Blue Blue Blue Blue water wetting Color difference A A A A A A B Color bleeding B A A A A B B Time until discoloration Immediate Immediate Immediate Immediate Immediate Immediate Immediate

TABLE-US-00002 TABLE 2 Examples 8 9 10 11 12 13 14 Component composition Hydrocarbon Paraffin oil (liquid paraffin) 0 0 0 0 0 0 0 oil Paraffin oil (KP-68) 0 0 66 57 74 69 69 Paraffin oil (PW-32) 67 0 0 0 0 0 Naphthene oil (KN4010) 0 63 0 0 0 0 0 Colorant pH Indicator (bromocresol 0 0 0 0 0 0 1 green) Leuco dye (crystal violet 0.1 3 1 1 1 0 0 lactone) Leuco dye (Blue 1) 0 0 0 0 0 1 0 Leuco dye (Blue 203) 0 0 0 0 0 0 0 Surfactant Anionic (Na dodecylbenzene 11 11 11 14 4 0 0 sulfonate) Anionic (Na dioctyl 0 0 0 0 0 10 0 sulfosuccinate) Nonionic (AQ250) 0 0 0 0 0 0 10 Saturated 16-Hydroxyhexadecanoic acid 0 0 0 0 0 0 0 fatty acid Mg stearate 0 0 0 0 0 0 0 12-Hydroxystearic acid 22 22 22 28 21 20 20 Na stearate 0 0 0 0 0 0 0 Tackifier Hydrogenated gum rosin 10 10 0 0 4 0 0 resin (RHR-101HK) Hydrogenated rosin (AX-E) 0 0 10 0 0 0 0 Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (HD-1100) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (P100) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (ECR5400) Hydrogenated hydrocarbon 0 0 0 28 0 0 0 (FTR-6100) Total 110 110 110 128 104 100 100 Composition applied sample Performance Appearance (presence or Presence Presence Presence Presence Presence Presence Presence evaluation absence of oily gel) of gel of gel of gel of gel of gel of gel of gel results Appearance (hardness of Soft Soft Soft Hard Soft Soft Soft composition for indicator) Phase separation (100° C. A A A B B B C for 24 hours) Odor A A A A A A B Initial hue — — — — — — Yellow Hue (final color) after Light Blue Dark blue Dark blue Dark blue Dark blue Blue Light blue water wetting Color difference B A A A A B B Color bleeding B B B A B B B Time until discoloration Immediate Immediate Immediate Immediate Immediate Immediate Immediate

TABLE-US-00003 TABLE 3 Examples 15 16 17 18 19 20 21 Component composition Hydrocarbon Paraffin oil (liquid paraffin) 0 0 0 64 64 0 53 oil Paraffin oil (KP-68) 54 51 0 0 0 43 0 Paraffin oil (PW-32) 0 0 40 0 0 0 0 Naphthene oil (KN4010) 0 0 0 0 0 0 0 Colorant pH Indicator (bromocresol 0 0 0 2 2 0 0 green) Leuco dye (crystal violet 1 0 0 0 0 1 2 lactone) Leuco dye (Blue 1) 0 0.4 0 0 0 0 0 Leuco dye (Blue 203) 0 0 0.2 0 0 0 0 Surfactant Anionic (Na dodecylbenzene 10 17 17 11 11 13 7 sulfonate) Anionic (Na dioctyl 0 0 0 0 0 0 0 sulfosuccinate) Nonionic (AQ250) 0 0 0 0 0 0 0 Saturated 16-Hydroxyhexadecanoic acid 0 0 0 22 0 0 0 fatty acid Mg stearate 0 0 0 0 22 0 0 12-Hydroxystearic acid 34 0 42 0 0 43 0 Na stearate 0 32 0 0 0 0 39 Tackifier Hydrogenated gum rosin 12 8 10 10 10 9 6 resin (RHR-101HK) Hydrogenated rosin (AX-E) 0 0 0 0 0 0 0 Hydrogenated hydrocarbon 30 45 0 0 0 45 35 (HD-1100) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (P100) Hydrogenated hydrocarbon 0 0 38 0 0 0 0 (ECR5400) Hydrogenated hydrocarbon 0 0 0 0 0 0 0 (FTR-6100) Total 142 153 148 110 110 154 141 Composition applied sample Performance Appearance (presence or Presence Presence Presence Presence Presence Presence Presence evaluation absence of oily gel) of gel of gel of gel of gel of gel of gel of gel results Appearance (hardness of Hard Hard Very hard Soft Soft Very hard Hard composition for indicator) Phase separation (100° C. A B A A A A B for 24 hours) Odor A A A B B A A Initial hue — Light brown — Yellow Light green — Light blue Hue (final color) after Dark blue Dark blue Blue Light blue Dark blue Dark blue Dark blue water wetting Color difference A A B B A A A Color bleeding A A A B B A A Time until discoloration Immediate Immediate Immediate Immediate Immediate Immediate Immediate

TABLE-US-00004 TABLE 4 Comparative Example 1 2 3 4 5 Component composition Hydrocarbon Paraffin oil (liquid paraffin) 0 87 76 86 3 oil Paraffin oil (KP-68) 0 0 0 0 0 Paraffin oil (PW-32) 0 0 0 0 0 Colorant pH Indicator (bromocresol green) 6 2 2 0 0 Leuco dye (crystal violet lactone) 0 0 0 2 1 Surfactant Anionic (Na dodecylbenzene sulfonate) 31 11 0 10 0 Saturated 12-Hydroxystearic acid 63 0 22 1 93 fatty acid Tackifier Hydrogenated gum rosin (RHR-101HK) 68 10 10 11 3 resin Hydrogenated hydrocarbon (ECR5400) 0 0 0 0 0 Total 168 110 110 110 110 Composition applied sample Performance Appearance (presence or absence Absence Absence Absence Absence Absence evaluation of oily gel) of gel of gel of gel of gel of gel results Appearance (hardness of composition Liquid Hard solid Hard gel Liquid Solid for indicator) Phase separation (100° C. for A A A B D 24 hours) Odor D D D A A Initial hue Dark yellow Yellow Light yellow — — Hue (final color) after water Dark yellow Yellow Light yellow — — wetting Color difference D D D D D Color bleeding D A B D A Time until discoloration — — — — —

[0145] As shown in Tables 1 to 3, in the compositions for wet indicator of Examples, the components are not separated, and a strong odor is not generated. Further, in the compositions for wet indicator of Examples, a change in color is clear, time from the initial stage to the final discoloration is short, and the color is not blurred.

[0146] On the other hand, in the compositions for wet indicator of Comparative Examples 1 to 5, there is no change between the initial hue and the hue after wetted with water, and thus they are not suitable for indicators. In Comparative Examples 1 to 3, an odor cannot be suppressed.

INDUSTRIAL APPLICABILITY

[0147] The composition for wet indicator of the present invention provides a wet indicator to be attached to an absorbent article such as a diaper or a napkin.