KR20150026893A - Eraser-like cleaner - Google Patents

Abstract

Disclosed is an eraser-like cleaner which includes a molded product of composite including a base resin, a nonbridging rubber. The molded product has an initial hardness of 50 or more. A difference between the initial hardness and a hardness after 30 seconds is 3 to 9. The value of the initial hardness and the hardness after 30 seconds is a value of scale label as an integer read instantly or after 30 second by using a hardness tester (C-type hardness tester) according to JIS S 6050. An eraser-like cleaner according to an embodiment of the present invention, a strain on a wall paper can be removed by rubbing it only like an eraser. Moreover, removed contamination or particles having the contamination is/are not scattered and are attached to a cleaner so that the spread of contamination can be prevented.

Description

Eraser-type cleaner {ERASER-LIKE CLEANER}

The present invention relates to an eraser-type cleaner, and more specifically, it is possible to remove stain such as stains on a wallpaper by merely rubbing the eraser as if erasing the character with the eraser, and furthermore, the removed stain or broken- Type cleaner which does not scatter near dust and can be attached to the cleaner main body so as to be cohered, and the vicinity thereof is not contaminated.

Solvents and neutral detergents are described as cleaners for removing contaminants such as stains on wallpaper in the past, and erasers are also described (http://www.homepro.co.jp/info/kabegami/basics/kiso009.shtml ). Further, eraser-type cleaners containing stain-dissolving ingredients and abrasive materials can be used commercially (http://www.kenko.com/product/item/itm_691018372.html). In addition, eraser-type cleaners including melamine, vinyl chloride and phenylglycol are also commercially available (http://www.rakuten.co.jp/brico/429250/515337/708655).

However, solvents are usually difficult to obtain at home and include safety and health concerns. Moreover, the neutral detergent has a disadvantage that it takes a long time to remove stains. Also, the eraser is insufficient to remove stains, and the eraser containing the abrasive material tends to damage the surface of the wallpaper.

Specifically, an eraser-type cleaner comprising, for example, a rubber or resin composition and, if necessary, further comprising an abrasive material, can be formed by molding a composition comprising a rubber or resin composition, or even an abrasive material, Can be easily produced. In addition, dirty fingerprints and dirty stains in use can be removed by rubbing as well as erasing letters with an eraser, which is therefore useful. Moreover, since the new surface of the cleaner is exposed for use each time, the decontamination effect can always be achieved in a fresh state.

On the other hand, if the eraser-type cleaner is used to remove contamination, the surface of the cleaner is re-applied by adsorbing the contamination on the cleaner and separating the contaminated adsorbed surface of the cleaner as debris, .

Thus, generation of debris in the cleaner is essential, and cleaners that do not generate debris will not reface the surface of the cleaner, so that the stain adhered to the surface of the cleaner will be retained, and thus removal using such a cleaner will result in poor decontamination performance In the worst case, it will rub the contamination on the polluted object to be decontaminated, such as wallpaper.

As described above, in the case of eraser-type cleaners, the generation of debris is associated with decontamination, and decontamination performance also tends to increase as the amount of debris increases.

However, when large quantities of debris are generated, these debris will scatter on or near the object to be decontaminated, or they will contaminate it on the floor and require cumbersome cleaning work. In addition, this is true even if the removed contamination remains on the object to be decontaminated.

The present invention provides an eraser-type cleaner which is extremely easy to use, in order to solve the problem of the prior art in terms of the above-mentioned situation, and which has good accumulation of debris generated when the contamination is removed by a cleaner , Which tends to adhere to the cleaner body with the removed contaminants being adsorbed on the debris so that the debris will not be scattered on or near the object to be decontaminated or will fall on the floor and contaminate it, Therefore, no cleaning is required after decontamination, or only a simple cleaning is required.

The present invention has been achieved in order to solve the above-mentioned problems, and has the following features.

(1) An eraser-type cleaner comprising a molded article of a composition containing a base resin and an uncombined rubber, wherein the molded article has an initial hardness of 50 or more, and wherein the difference in variation between the initial hardness and the hardness after 3 seconds is 3 to 9 Within the range of < RTI ID = 0.0 >

The initial hardness was measured by using a hardness tester (C-type hardness tester) according to JIS S 6050, and the value of the scale mark read out as an integer as soon as the indenter of the tester was moved vertically in contact with the surface of the test piece held in a horizontal posture ego;

The hardness after 3 seconds is the value of the scale mark read out as an integer 3 seconds after the initial hardness measurement.

(2) An eraser-type cleaner wherein the base resin is a styrene elastomer.

(3) the styrene elastomer is a styrene-butadiene-styrene (SBS) copolymer, a styrene-isoprene-styrene (SIS) copolymer, a styrene-ethylene / propylene- styrene (SEPS) copolymer, a styrene-ethylene / SEBS) copolymers, and styrene-ethylene / ethylene / propylene-styrene (SEEPS) copolymers.

(4) The eraser-type cleaner wherein the non-crosslinked rubber is at least one selected from butyl rubber, natural rubber, styrene-butadiene rubber, ethylene-propylene rubber, isoprene rubber, and butadiene rubber.

(5) An eraser-type cleaner further comprising a tackifier.

(6) An eraser-type cleaner further containing a softening agent.

(7) An eraser-type cleaner further containing a filler.

(8) The eraser-type cleaner wherein the composition comprises 40 to 95 parts by weight of a base resin and 60 to 5 parts by weight of an uncrosslinked rubber.

(9) The eraser-type cleaner wherein the tackifier is 5 to 35 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber.

(10) The eraser-type cleaner wherein the softening agent is 15 to 35 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber.

(11) The eraser-type cleaner wherein the filler is 200 to 700 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber.

(12) Eraser-type cleaner for removing stains on wallpaper.

The eraser-type cleaner according to the present invention is excellent in the accumulation of debris generated when the debris is removed, so that it can be attached to the cleaner body without being scattered in the vicinity. Also, it is easy to adsorb the removed debris and is extremely easy to use, No need to clean the debris or removed contamination, or only a simple cleaning is necessary, as the removed contamination is avoided, such as the fact that it is scattered on or near the object to be decontaminated, or it floats on the floor and contaminates it.

In addition, when the eraser-type cleaner is used to remove stains on the wallpaper, the surface of the wallpaper is not damaged.

The base resin used in the present invention is preferably a styrene elastomer in terms of good agglomeration. Examples of the styrene elastomer include styrene-ethylene / propylene-styrene (SEPS) copolymers, styrene-ethylene / butylene-styrene (SEBS) copolymers, styrene-isoprene- -Styrene (SBS) copolymers, and styrene-ethylene / ethylene / propylene-styrene (SEEPS) copolymers.

The styrene-ethylene / propylene-styrene (SEPS) copolymers include, for example, SEPTON 2002, SEPTON 2006, SEPTON 2063, and SEPTON 2104 (all from Kuraray Co., The styrene (SEBS) copolymers include, for example, SEPTON 8076 and SEPTON 8104 (all Kuraray Co., Ltd.), and styrene-isoprene-styrene (SIS) copolymers include, for example, HYBRAR 5127 (Kuraray Co., Ltd.). TUFPRENE A, TUFPRENE 126, and ASAPRENE T-475 (both available from Asahi Kasei Chemicals Corporation), KRATON D-4271 (available from Kraton Polymers Japan Ltd.), and the styrene-butadiene-styrene SEPTON 4055, SEPTON 4055, and SEPTON 4077 (both of which are Kuraray Co., Ltd.), and PB575 (CHIMEI CORPORATION), and the styrene-ethylene / ethylene / propylene- do. These may be used alone or in combination of two or more if necessary.

EXXONBUTYL 065, EXXONBUTYL 365 and EXXONBUTYL 268 (all from ExxonMobil Chemical Ltd.), Bayer Butyl 301, Bayer Butyl 100 and Bayer Butyl 402 (all from Bayer Corporation), JSR Butyl 065, JSR Butyl rubber such as Butyl 268 and JSR Butyl 365 (all from JSR Corporation) and Oppanol B50, Oppanol B80, Oppanol B100, Oppanol B150 and Oppanol B200 (all from BASF Japan Ltd.); Natural rubber such as RSS # 1 (produced in Indonesia); Styrene-butadiene rubbers such as SBR 1502; Ethylene-propylene rubbers such as EP 33; Isoprene rubber such as IR 2200; And butadiene rubbers such as BR 18 (both JSR Corporation), which are used singly or in combination of two or more if necessary.

The tackifier used in the present invention is used to adjust hardness and viscoelasticity, particularly viscoelasticity, of the eraser-type cleaner, if necessary. The use of tackifiers can improve the build up of contamination and debris removed and its adhesion to the cleaner body. Examples of the tackifier include olefin resins such as butene copolymers, terpene resins, coumarone-indene resins, petroleum resins, and rosin resins. These materials may be used alone or in combination of two or more if necessary.

The softeners used in the present invention are used to adjust the hardness and viscoelasticity, particularly the hardness, of the eraser-type cleaner if necessary. Mineral oils, animal and vegetable oils, or plasticizers derived from these oils can be used as such softeners. Mineral oils specifically include paraffinic process oils, naphthenic process oils, and aromatic process oils. The animal and vegetable oils are specifically selected from the group consisting of plain oil, refined rapeseed oil, castor oil, cottonseed oil, flaxseed oil, soybean oil, sesame oil, corn oil, safflower oil, palm oil, coconut oil, peanut oil, Japanese wax, rosin, . Plasticizers derived from animal and vegetable oils include glycerin fatty acid esters and specifically include glycerin diaceton monolaurate, glycerin triacetate, and glycerol diacetate. These softeners may be used alone or in combination of two or more if necessary. Biomass-derived animal and vegetable oils or plasticizers derived from these oils can be used as renewable resources to provide environmentally-compatible eraser-type cleaners.

The filler used in the present invention is used to adjust the weight increase and hardness of the eraser-type cleaner, if necessary. Examples of such fillers are powders of shells such as heavy calcium carbonate, light calcium carbonate, silica, diatomaceous earth, magnesium oxide, titanium carbide, talc, sericite, quartz powder, montmorillonite, scallop, oyster and freshwater clams, egg shell powder, Particles, and inorganic hollow particles. These fillers may be used alone or in combination of two or more if necessary. Biomass-derived powders of shells such as scallops and oysters, or eggshell powder, which are generated in large quantities as refuse to provide environmentally-compatible eraser-type cleaners, can be used.

The eraser-type cleaner according to the present invention is made to be in the form of a solid molded article by various molding machines and is designed to adsorb the rubbed rubbing against the surface of the cleaner against the stain such as stains or the like as if erasing the letters with an eraser, The cleaner is characterized by the fact that no debris is separated from the cleaner and the separated debris are not dispersed near the debris, and the debris in the cleaner is as much as possible And has agglomeration for attachment.

In order to remove the contamination with the cleaner according to the present invention, the hardness (initial hardness) is required so that the cleaner can be grasped with the hand by grasping against the contamination. Next, the wallpaper surface has, for example, irregularities, and the irregularities are present on the irregularities. Therefore, in order to remove the unevenness existing on the uneven surface, it is necessary to follow the uneven surface of the unevenness so that the cleaner changes and comes into contact with the unevenness. The cleaner is repeatedly reciprocated several times for friction until the stain is removed, at which point the stiffness is reduced to contact the uneven surface of the stain and the scraped stain is reduced to provide the viscoelasticity that the adsorbed debris can attach to the cleaner Post-hardness), then it is necessary to recover the original hardness for the next use.

More specifically, it is necessary that a proper shape retention is required to grasp the cleaner by hand and to rub the cleaner against the contaminants, a suitable hardness that does not cause plastic deformation, and no attachment such as that attached to a finger. In addition, a suitable hardness and appropriate viscoelasticity are required to rub the cleaner so as to come into contact with the uneven surface of the stain and to remove the stain.

On the other hand, it is necessary that the debris absorbed by the peeling stain is not separated from the cleaner and has viscoelasticity, and it is necessary to restore and maintain the original hardness and shape retention property of the cleaner for reuse after decontamination.

In order to provide satisfactory properties, the hardness at the start of decontamination, i. E. The initial hardness, needs to be at least 50, and the difference in variation between the initial hardness and the hardness after 3 seconds needs to be within the required range, i. . When the eraser-type cleaner is used for wallpaper, the upper limit of the initial hardness is preferably near 80 in accordance with a wallpaper material such as paper, fabric, vinyl chloride resin, and the like. If the initial hardness exceeds 80, wallpaper tends to be damaged. An initial hardness of less than 50 is too soft to achieve sufficient shape retention and sufficient peeling of contamination, thereby reducing ease of rubbing and cleanliness. In addition, when the difference in the difference between the initial hardness and the hardness after 3 seconds is less than 2, it is difficult for the cleaner to change due to insufficient viscoelasticity to follow the uneven surface of the unevenness. On the other hand, when it is 10 or more, easiness of rubbing and cleanliness are reduced, Agglomeration is also reduced. Moreover, it is difficult to restore and maintain the original hardness and shape retention of the cleaner for reuse.

The initial hardness was measured by using a hardness tester (C-type hardness tester) according to JIS S 6050, and the value of the scale mark read out as an integer as soon as the indenter of the tester was moved vertically in contact with the surface of the test piece held in a horizontal posture And the hardness after 3 seconds refers to the hardness after 3 seconds of initial hardness measurement, that is, the value of the scale mark after 3 seconds in contact with the surface under pressure as in the case of initial hardness measurement.

Each component according to the present invention is formulated to provide satisfactory hardness and viscoelasticity. In addition, the proportion of the components incorporated varies with the type of each component used, so it is difficult to specify the ratio clearly. Therefore, although not necessarily coupled with theory, the base resin is 40 to 95 parts by weight and the non-crosslinked rubber is 60 to 5 parts by weight (the sum of both components is 100 parts by weight) when presented as provisional guidelines. In addition, when the tackifier, softener and filler are blended, the tackifier is contained in an amount of 5 to 35 parts by weight, the softening agent is 15 to 35 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber, Is 200 to 700 parts by weight.

For the purpose of modifying the properties, resins such as ethylene, polypropylene, polyethylene vinyl acetate, polyethylene ethyl acrylate, chlorinated polyethylene and poly (meth) acrylate, surfactants, antioxidants, light stabilizers, lubricants, Antiseptics, colorants, perfumes, etc. may be added to the cleaner according to the present invention. These additives are about 1 to 15 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber.

The cleaner composition containing the above-described components is kneaded, molded into a solid molded article by press molding, injection molding, extrusion molding or the like, and cut into a predetermined size to form an eraser-type cleaner.

The eraser-type cleaner of the present invention is highly agglomerated, the debris absorbing debris and the removed contaminants adhere well to the cleaner body, and is preferably about 80% or more, more preferably about 90% or more, most preferably about 100% is attached to the cleaner body. The debris absorbing the dirt not attached to the cleaner body is also not scattered around, so it is very easy to clean.

The eraser-type cleaner of the present invention is suitable for removing contaminants on objects to be decontaminated that tend to be damaged by a cleaner containing an abrasive material, and which is suitable for the removal of wallpaper (paper, vinyl, textile wallpaper) It is particularly useful for decontamination.

The invention will be explained in more detail with reference to examples and comparative examples, but the invention is not limited in any way by these examples.

Table 1 shows the materials used in the following Examples and Comparative Examples. In Tables 2 to 4, the cleaner compositions have numbers (amounts) based on weight unless otherwise noted. Furthermore, the amounts of tackifiers, fillers, softeners and surfactants in Tables 2 to 4 are based on the total 100 parts by weight of the base resin and the non-crosslinked rubber.

product name Name of material Manufacturer PB575 SBS (base resin) CHIMEI CORPORATION KRATON D-4271 SBS (base resin) Kraton Polymers Japan Ltd. SEPTON 2002 SEPS (St 30%) (base resin) Kuraray Co., Ltd. SEPTON 8076 SEPS (St 30%) (base resin) Kuraray Co., Ltd. SEPTON 2063 SEPS (St 13%) (base resin) Kuraray Co., Ltd. SEPTON 4055 SEEPS (St 30%) (base resin) Kuraray Co., Ltd. EXXONBUTYL 268 Butyl rubber (non-crosslinked rubber) ExxonMobil Chemical Ltd. RSS # 1 Natural rubber (non-crosslinked rubber) Produced in Indonesia SBR1502 Styrene-butadiene rubber
(Non-crosslinked rubber) JSR Corporation EP33 Ethylene-propylene rubber
(Non-crosslinked rubber) JSR Corporation IR2200 Isoprene rubber (non-crosslinked rubber) JSR Corporation BR18 Butadiene rubber (non-crosslinked rubber) JSR Corporation RT-2730 Olefin resin Huntsman Corporation KRATONU-185 Petroleum resin (tackifier) ZEON CORPORATION ESTERGUM AAG Ester gum (rosin) (tackifier) Arakawa Chemical Industrials,
Ltd. TAMANOL 901 Terpene phenolic resin (tackifier) Arakawa Chemical Industrials,
Ltd. SS-80 Heavy calcium carbonate (filler) NITTO FUNKA KOGYO K.K. VN-3 Silica (filler) TOSOH SILICA CORPORATION Process oil
PW-32 Paraffin-based process oil (softener) Idemitsu Kosan Co., Ltd. EXCEL S-95 Glycerol monostearate
(Surfactants) Kao Corporation

Examples 1 to 21 and Comparative Examples 1 to 3

A cleaner composition having the components and blending ratios shown in Tables 2 and 3 was kneaded and then extruded using a metal mold of a predetermined size to obtain a test piece of an eraser-type cleaner of a solid molded article.

The obtained test pieces were measured or evaluated by the following methods based on initial hardness, hardness after 3 seconds, difference in variation between two hardness values, agglomeration of debris (removed stains), easiness of rubbing, cleanliness and wallpaper state . The results are shown in Tables 2 and 3.

Measurement and evaluation methods

Initial Hardness: After storing the specimens for 2 hours in a high-temperature, high-humidity bath at 23 캜 x 50% RH, the value of the scale mark was maintained in a horizontal position using a hardness tester (C-type hardness tester) according to JIS S 6050 Immediately after moving the indenter of the tester in contact with the surface of the specimen under pressure and vertically, it was read as an integer.

After 3 seconds, the hardness: the value of the scale mark was read as an integer three seconds after the initial hardness measurement.

Agglomeration: The test specimen was pushed against the contamination (red pencil) on the vinyl wallpaper with a force of 1 kg, and then reciprocated 10 times for friction. Next, the debris adsorbed on the contaminated powder and the removed contaminant powder were removed from the specimen ), And then visually assessed how much it was united. The result is indicated by the percentage of the attached debris and the amount of contamination removed relative to the total amount of generated.

?: About 90 to 100%

DELTA: about 80 to less than 90%

X: less than about 80%

Ease of rubbing: The specimen was pushed against the stain adhered on the vinyl wallpaper with a force of 1 kg, reciprocated 10 times for friction, and then visually evaluated whether the original shape of the specimen was maintained or not.

○: maintained

△: Maintained substantially

×: Not maintained

Cleanliness: The test specimen was pushed against the contamination adhering to the vinyl wallpaper with a force of 1 kg, reciprocated 10 times for friction, and then visually evaluated for the cleanliness of the wallpaper.

○: Cleanliness

△: substantially clean

×: Not clean

State of the wallpaper: The specimen was pressed against the stain adhering to the vinyl wallpaper with a force of 1 kg, and then reciprocated for 10 rubbing, and then visually evaluated for the presence or absence of damage (tear) on the wallpaper surface.

○: No damage

△: slightly damaged

X: Damaged

Cleaner composition (part)
Example One 2 3 4 5 6 7 8 9 10 11 12 13 Base resin


PB575: SBS 35 18 0 18 0 15 35 15 35 53 0 35 35 KRATON D-4271: SBS 0 0 0 0 0 0 0 0 0 0 44 0 0 SEPTON 2002: SEPS
(St 30%) 35 53 0 0 0 15 0 15 0 0 44 35 35 SEPTON 8076: SEPS
(St 30%) 0 0 71 53 0 0 0 0 0 0 0 0 0 SEPTON 2063: SEPS
(St 13%) 0 0 0 0 71 45 35 0 0 0 0 0 0 SEPTON 4055: SEPS
(St 30%) 0 0 0 0 0 0 0 45 35 18 0 0 0 Non-crosslinked rubber EXXONBUTYL 268:
Butyl rubber 30 29 29 29 29 25 30 25 30 29 12 30 30 cohesion
Granting agent RT2730:
Olefin resin 29 29 29 29 29 15 18 15 18 18 18 18 18 Filler
SS-80:
Heavy calcium carbonate 294 294 294 294 294 250 294 250 294 294 305 294 294 VN-3: Silica 6 6 6 6 6 5 6 5 6 6 6 6 6 Softener PW-32: Paraffin system
Process oil 31 31 31 31 31 26 31 26 31 31 32 31 31 Interface
Activator EXCEL S-95:
Glycerol
Monostearate 7 7 7 7 7 6 7 6 7 7 7 7 7 Base resin 70 71 71 71 71 75 70 75 70 71 88 70 70 Non-crosslinked rubber 30 29 29 29 29 25 30 25 30 29 12 30 30 Hardness Initial hardness 70 75 70 63 62 60 57 82 70 65 78 65 75 Long after 3 seconds 63 70 66 57 55 52 48 79 67 61 75 60 69 Difference in variation of two hardness values 7 5 4 6 7 8 9 3 3 4 3 5 6 evaluation Agglomeration ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Ease of rubbing ○ ○ ○ ○ ○ ○ △ ○ ○ △ ○ ○ ○ Cleanliness ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Wallpaper status ○ ○ ○ ○ ○ ○ ○ △ ○ ○ ○ ○ ○

Cleaner composition (part)
Example Comparative Example 14 15 16 17 18 19 20 21 One 2 3 Base
Suzy PB575: SBS 35 22 22 44 35 35 35 35 0 0 50 KRATON D-4271: SBS 0 0 0 0 0 0 0 0 71 35 0 SEPTON 2002: SEPS
(St 30%) 35 22 22 44 35 35 35 35 0 35 50 Non-bridge
Rubber



EXXONBUTYL 268:
Butyl rubber 30 56 0 0 0 0 0 0 29 30 0 RSS # 1: Natural rubber 0 0 56 12 0 0 0 0 0 0 0 SBR1502:
Styrene-butadiene rubber 0 0 0 0 30 0 0 0 0 0 0 EP33:
Ethylene-propylene rubber 0 0 0 0 0 30 0 0 0 0 0 IR2200:
Isoprene rubber 0 0 0 0 0 0 30 0 0 0 0 BR18: Butadiene rubber 0 0 0 0 0 0 0 30 0 0 0 cohesion
Granting agent RT2730: Olefin resin 18 11 11 22 18 18 18 18 18 18 25 Filler
SS-80: Heavy calcium carbonate 647 278 278 305 294 294 294 294 294 294 313 VN-3: Silica 6 6 6 6 6 6 6 6 6 6 6 Softener PW-32: Paraffin system
Process oil 31 29 29 32 31 31 31 31 31 31 33 Interface
Activator EXCEL S-95:
Glycerol
Monostearate 7 7 7 7 7 7 7 7 7 7 8 Base resin 70 44 44 88 70 70 70 70 71 70 100 Non-crosslinked rubber 30 56 56 12 30 30 30 30 29 30 0 Hardness Initial hardness 78 57 74 79 69 72 72 71 60 73 83 Long after 3 seconds 75 50 70 76 62 65 68 64 50 71 82 Difference in variation of two hardness values 3 7 4 3 7 7 4 7 10 2 One evaluation Agglomeration ○ ○ ○ ○ ○ ○ ○ ○ △ △ × Ease of rubbing ○ ○ ○ ○ ○ ○ ○ ○ △ ○ ○ Cleanliness ○ ○ ○ ○ ○ ○ ○ ○ △ ○ ○ Wallpaper status ○ ○ ○ ○ ○ ○ ○ ○ ○ × △

As apparent from the results of Table 2 and Table 3, Examples 1 to 21, which contain the base resin and the non-crosslinked rubber, show that the test piece has an initial hardness of 50 or more, and the difference in variation between the initial hardness and the hardness after 3 seconds is 3 to & 9, it maintains the shape of the eraser-type cleaner while being excellent in all aspects of agglomeration, rub easiness, cleanliness and wallpaper condition.

On the other hand, Comparative Example 1 in which the difference in the initial hardness between the initial hardness and the hardness after 3 seconds is 10 is too soft to maintain the shape of the eraser-type cleaner, and therefore, it is not easy to roll, rub easiness and cleanliness. Comparative Examples 2 and 3, in which the test piece has a variation of 2 or 1, maintain the shape of the eraser-type cleaner and are easy to rub and clean, but are poor in agglomeration and damage the wallpaper.

Examples 22 to 27

A test piece of an eraser-type cleaner was obtained as shown in Table 4, and measurement or evaluation was conducted in the same manner as in Example 1, except that the blending amount and kind of the tackifier were changed. The results are shown in Table 4.

Cleaner composition (part)
Example 22 23 24 25 26 27 Base resin
PB575: SBS 35 35 35 35 35 35 SEPTON 2002: SEPS (St 30%) 35 35 35 35 35 35 Non-crosslinked rubber EXXONBUTYL 268: Butyl rubber 30 30 30 30 30 0 Tackifier

RT2730: Olefin resin 0 6 35 0 0 0 KRATON U-185: Petroleum resin 0 0 0 18 0 0 ESTERGUM AAG: Estergum (rosin) 0 0 0 0 18 0 TAMANOL 901: terpene phenolic resin 0 0 0 0 0 18 Filler
SS-80: Heavy calcium carbonate 294 294 294 294 294 294 VN-3: Silica 6 6 6 6 6 6 Softener PW-32: paraffinic process oil 31 31 31 31 31 31 Surfactants EXCEL S-95: Glycerol
Monostearate 7 7 7 7 7 7 Base resin 70 70 70 70 70 70 Non-crosslinked rubber 30 30 30 30 30 30 Hardness Initial hardness 77 75 65 86 70 82 Long after 3 seconds 74 71 59 83 65 79 Difference in variation of two hardness values 3 4 6 3 5 3 evaluation Agglomeration △ ○ ○ ○ ○ ○ Ease of rubbing ○ ○ △ ○ ○ ○ Cleanliness ○ ○ ○ ○ ○ ○ Wallpaper status ○ ○ ○ ○ ○ ○

As is apparent from the results in Table 4, an eraser-type cleaner having well-balanced properties in terms of agglomeration, rubbing easiness, cleanliness and wallpaper condition can be obtained in the same manner as in Example 1, even when the blending amount or kind of the tackifier is changed.

As described above, the eraser-type cleaner according to the present invention is excellent in shape retention and is therefore easy to rub and clean with the fingers being held by the fingers, is extremely easy to use, Is attached to this cleaner and does not need cleaning after decontamination or only a simple cleaning is necessary because it avoids the difficulties such as scattering on the object to be decontaminated or the fact that it falls on the floor and contaminates it. Furthermore, the surface of the wallpaper is not damaged when the eraser-type cleaner is used to remove stains on the wallpaper.

Claims (12)

An eraser-type cleaner comprising a molded article of a composition comprising a base resin and an uncrosslinked rubber, wherein the molded article has an initial hardness of at least 50 and wherein the difference of variation between the initial hardness and the hardness after 3 seconds is in the range of 3 to 9 , here
The initial hardness was measured by using a hardness tester (C-type hardness tester) according to JIS S 6050, and the value of the scale mark read out as an integer as soon as the indenter of the tester was moved vertically in contact with the surface of the test piece held in a horizontal posture ego;
The hardness after 3 seconds is the value of the scale mark read as an integer after 3 seconds of initial hardness measurement. The eraser-type cleaner according to claim 1, wherein the base resin is a styrene elastomer. 3. The composition of claim 2 wherein the styrene elastomer is selected from the group consisting of styrene-butadiene-styrene (SBS) copolymers, styrene-isoprene-styrene (SIS) copolymers, styrene-ethylene / propylene- Styrene (SEBS) copolymer, and a styrene-ethylene / ethylene / propylene-styrene (SEEPS) copolymer. The eraser-type cleaner according to claim 1, wherein the non-crosslinked rubber is at least one selected from butyl rubber, natural rubber, styrene-butadiene rubber, ethylene-propylene rubber, isoprene rubber, and butadiene rubber. The eraser-type cleaner according to claim 1, further comprising a tackifier. The eraser-type cleaner according to claim 1, further comprising a softening agent. The eraser-type cleaner according to claim 1, further comprising a filler. The eraser-type cleaner according to claim 1, wherein the composition comprises 40 to 95 parts by weight of a base resin and 60 to 5 parts by weight of an uncrosslinked rubber. The eraser-type cleaner according to claim 5, wherein the tackifier is 5 to 35 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber. The eraser-type cleaner according to claim 6, wherein the softener is 15 to 35 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber. The eraser-type cleaner according to claim 7, wherein the filler is 200 to 700 parts by weight based on 100 parts by weight of the total of the base resin and the non-crosslinked rubber. Use of an eraser-type cleaner according to claim 1 for removing stains on a wallpaper.