KR20080006924A - A composite of antibiosis resin - Google Patents

A composite of antibiosis resin Download PDF

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KR20080006924A
KR20080006924A KR1020060066273A KR20060066273A KR20080006924A KR 20080006924 A KR20080006924 A KR 20080006924A KR 1020060066273 A KR1020060066273 A KR 1020060066273A KR 20060066273 A KR20060066273 A KR 20060066273A KR 20080006924 A KR20080006924 A KR 20080006924A
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weight
titanium dioxide
resin composition
antimicrobial
present
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문인식
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주식회사 아이몰드텍
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/015—Biocides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0862—Nickel
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Agronomy & Crop Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

An antimicrobial resin composition is provided to ensure a good antimicrobial property, to prevent pollution of an electronic product case or a food container, and to remove stench or bacteria rapidly and effectively. An antimicrobial resin composition includes a mixture of 98-99.5wt% of acrylic melamine resins and 0.5-2wt% of titanium dioxide powder, or 99.45wt% of the acrylic melamine resin, 0.5wt% of the titanium dioxide powder, 0.02wt% of nickel, 0.02wt% of chrome, and 0.01wt% of manganese. The titanium dioxide powder is obtained by processing a titanium metal plate into fine powder having a particle size of 5-30 micron, and then oxidizing the fine powder.

Description

항균성 수지 조성물{A composite of antibiosis resin}Antimicrobial resin composition {A composite of antibiosis resin}

도 1은 본 발명 실시예의 항균성 조성물을 표면에 코팅한 비닐팩(좌측사진)과 통상의 비닐팩(우측사진)에 사과를 각각 넣어서 1주일간 보관한 상태의 사진,1 is a photograph of a state in which an apple is placed in a plastic pack (left photograph) and a normal plastic pack (right photograph) coated with an antimicrobial composition according to an embodiment of the present invention, and stored for one week;

도 2는 본 발명 실시예의 항균성 조성물을 코팅한 식품용기(우측사진)와 통상의 식품용기(좌측사진)에 식빵을 각각 수용시키고 2주간 보관한 상태에서의 결과를 나타낸 사진,Figure 2 is a photograph showing the results in a state in which the bread is accommodated and stored for 2 weeks in a food container (right picture) and a conventional food container (left picture) coated with the antimicrobial composition of the present invention,

도 3은 본 발명 조성물이 코팅된 시험편(우측사진)과 본 발명 조성물이 코팅되지 아니한 대조편(좌측사진)을 비교실험한 결과를 나타낸 사진이다.Figure 3 is a photograph showing the results of a comparative experiment of the test piece coated with the composition of the present invention (right picture) and the control piece (left picture) is not coated with the present invention composition.

본 발명은 항균성 수지 조성물에 관한 것으로써, 더 상세하게는 사용자의 신체접촉이 자주 이루어지는 전자제품의 케이스등에 사용될 수 있도록 멜라민수지에 광촉매용 이산화티타늄 분말을 혼합하여 제조함으로써 항균특성을 향상시키고 미세한 양의 빛에서도 효과적인 산화반응 작용을 할 수 있도록 한 항균성 수지 조성물에 관한 것이다.The present invention relates to an antimicrobial resin composition, and more specifically, to prepare a melamine resin by mixing titanium dioxide powder for photocatalyst to be used in a case of an electronic product which is frequently in contact with the user's body by improving the antibacterial properties and fine amount The present invention relates to an antimicrobial resin composition capable of effective oxidation reaction under light.

전자제품 예컨대, 전화기, 리모컨, 휴대폰 및 컴퓨터등에는 내부 전자부품을 보호시키는 케이스가 채용되어 있다.In electronic products such as telephones, remote controls, cellular phones, and computers, a case for protecting internal electronic components is employed.

이 케이스는 사용중 또는 휴대중에 인체로부터 발생되는 세균, 땀등의 이물질로 오염됨으로써 사용자의 건강을 해치고 있다. 더욱이 공중이 사용하는 경우에는 보다 심각한 감염이 우려된다.This case is contaminated with foreign substances such as bacteria, sweat, etc. generated from the human body during use or carrying, and thus damages the user's health. Moreover, when used by the public, more serious infections are concerned.

특히, 휴대폰의 경우에는 케이스가 얼굴에 근접하여 사용함으로써 오염물질로 인한 세균감염의 우려가 있고, 또한 유해한 전자파에 노출됨으로써 건강을 해치고 있다.In particular, in the case of a mobile phone, when the case is used close to the face, there is a risk of bacterial infection due to contaminants, and also harmful health by exposure to harmful electromagnetic waves.

한편, 이와 같은 전자제품 특히 휴대용 전자제품의 케이스는 이용자들이 휴대시 인체로부터 분비되는 땀 또는 외부 오염물질로 쉽게 오염되는 문제점이 있다.On the other hand, the case of such electronic products in particular portable electronic products has a problem that users are easily contaminated with sweat or external pollutants secreted from the human body when carrying.

본 발명은 상기와 같은 문제점을 해결하기 위하여 창출된 것으로써, 항균성을 가지며 전자제품 케이스, 식품용기등의 오염을 방지할 수 있도록 한 항균특성을 가지는 수지 조성물을 제공하는 데 그 목적이 있다.The present invention has been made in order to solve the above problems, and has an object of providing a resin composition having antibacterial properties and antibacterial properties to prevent contamination of electronic product cases, food containers and the like.

상기 목적을 달성하는 본 발명은 항균성수지 조성물에 있어서,The present invention to achieve the above object in the antimicrobial resin composition,

아크릴 멜라민수지 98~99.5 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5~2 중량%를 혼합하여 된 것을 특징으로 한다.98 to 99.5% by weight of acrylic melamine resin and 0.5 to 2% by weight of titanium dioxide (TiO 2 ) finely powdered and oxidized 5-30 μm by processing a titanium metal plate.

또한, 본 발명 조성물은 아크릴 멜라민수지 99.45 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5중량%와, 니켈(Ni) 0.02중량%, 크롬(Cr) 0.02중량%, 망간(Mn) 0.01중량%로 이루어진 것을 특징으로 한다.In addition, the composition of the present invention is 99.45% by weight of acrylic melamine resin, 0.5% by weight of titanium dioxide (TiO 2 ) finely powdered and oxidized 5-30 μm by processing a titanium metal plate, 0.02% by weight of nickel (Ni), chromium (Cr) 0.02% by weight, manganese (Mn) It is characterized by consisting of 0.01% by weight.

상기 본 발명의 특징에 의하면, 본 발명 수지조성물은 아크릴 멜라민수지에 광촉매제인 이산화티타늄을 혼합함으로써 자외선에 의해서도 반응하여 세균류, 냄새등을 신속하게 제거할 수 있으며, 특히 니켈등의 금속을 도핑함으로써 형광등과 같은 미세한 양의 빛에 의해서도 반응하게 하여 효과적인 항균 또는 방취가 가능하게 한다.According to the above characteristics of the present invention, the resin composition of the present invention can react with ultraviolet light by mixing titanium dioxide which is a photocatalyst with acrylic melamine resin to quickly remove bacteria, odors, and the like. Reacts even by a minute amount of light, such as to enable effective antibacterial or deodorant.

이하 첨부된 도면을 참조하면서 본 발명에 따른 바람직한 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명 실시예의 수지 조성물은 전자제품 예컨대, 전화기, 컴퓨터의 키보드, 휴대폰, 리모콘등의 케이스를 제조하는 데 사용될 수 있으며, 또는 전자제품의 케이스등에 코팅하여 사용될 수 있다.The resin composition of the embodiment of the present invention may be used to manufacture a case of an electronic product such as a telephone, a keyboard of a computer, a mobile phone, a remote control, or the like, or may be used by coating a case of an electronic product.

상기 전자제품들은 휴대하여 사용되는 등 사용자의 신체가 직접적으로 접촉되는 것으로서, 인체로부터 발생되는 땀, 세균 또는 냄새등으로부터 오염되어 위생상 악영향을 끼친다The electronic products are directly in contact with the user's body, such as being used by carrying, and are contaminated from sweat, bacteria, or odor generated from the human body, which adversely affects hygiene.

이와 같은 전자제품 케이스의 오염 또는 냄새로부터 제거 또는 방지하기 위하여 본 발명 실시예의 수지 조성물은 상기와 같은 전자제품의 케이스로서 사용될 수 있을 뿐만 아니라, 일반 전자제품의 케이스 표면에 코팅되어 사용될 수 있게 한 다. In order to remove or prevent from such contamination or smell of the electronics case, the resin composition of the embodiment of the present invention can be used as a case of the electronics as described above, and can be coated and used on the case surface of general electronics. .

이와 같은 본 발명 실시예로서, 전자제품의 케이스로서 사용될 수 있도록 한 제1실시예의 수지 조성물은 아크릴 멜라민수지 98~99.5 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5~2 중량%를 혼합하여 구성된다.As such an embodiment of the present invention, the resin composition of the first embodiment to be used as a case of electronic products is processed by the acrylic melamine resin 98 ~ 99.5% by weight, titanium metal plate to fine powder and oxidized 5 ~ 30㎛ Titanium dioxide (TiO 2 ) It is composed by mixing 0.5 to 2% by weight.

또한, 전자제품 케이스 표면에 코팅하여 사용할 수 있도록 한 제2실시예의 수지 조성물은 아크릴 멜라민수지 99.45 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5중량%와, 니켈(Ni) 0.02중량%, 크롬(Cr) 0.02중량%, 망간(Mn) 0.01중량%로 이루어진다. 이 경우 물에 용해 안되고 광촉매특성을 증가시킨다.In addition, the resin composition of the second embodiment to be coated on the surface of the electronic case can be used 99.45% by weight of acrylic melamine resin, and titanium metal plate was processed into a fine powder of 5 ~ 30㎛ titanium dioxide (TiO 2 ) It consists of 0.5 weight%, 0.02 weight% of nickel (Ni), 0.02 weight% of chromium (Cr), and 0.01 weight% of manganese (Mn). In this case, it is insoluble in water and increases the photocatalytic properties.

본 출원인 실험에 의하면, 상기 제2실시예의 수지 조성물을 50×50mm의 금속편에 코팅시킨 후, 아래표에서와 같은 균종을 접종시 균감소율이 거의 100% 이르렀다는 결과를 얻을 수 있었다.According to the applicant's experiment, after the resin composition of Example 2 was coated on a metal piece of 50 × 50 mm, the result of the inoculation of the strains as shown in the following table was nearly 100%.

도 3은 아래 표1의 5개의 시험편(우측사진)과 본 발명 조성물이 코팅되지 아니한 대조편(좌측사진)을 비교실험한 결과를 나타낸 사진이다.Figure 3 is a photograph showing the results of a comparative experiment of the five test pieces (right picture) of Table 1 below and the control piece (left picture) is not coated with the composition of the present invention.

시험편Test piece 크기size 균종Fungus 접종균액 농도Inoculation bacteria concentration 접종량Inoculation amount 정균감소율(%)Bacteriostatic reduction rate (%) 금속판표면에 상기 제2실시예의 조성물 코팅      Coating the composition of the second embodiment on a metal plate surface 50×50mm        50 × 50mm Staphylococcus aureus ATCC 6538PStaphylococcus aureus ATCC 6538P 5.6×105 CFU/mL5.6 × 10 5 CFU / mL 0.2mL 0.2mL 99.9 99.9 Escherichia coli ATCC 8739Escherichia coli ATCC 8739 1.4×106 CFU/mL1.4 × 10 6 CFU / mL 0.2mL 0.2mL 99.9 99.9 Pseudomonas aeruginosa ATCC 15442Pseudomonas aeruginosa ATCC 15442 1.5×106 CFU/mL1.5 × 10 6 CFU / mL 0.2mL 0.2mL 99.8 99.8 Klebsiella pneumoniae ATCC 4352Klebsiella pneumoniae ATCC 4352 5.7×105 CFU/mL5.7 × 10 5 CFU / mL 0.2mL 0.2mL 99.9 99.9 Salmonella typhimurium ATCC 14028 Salmonella typhimurium ATCC 14028 6.4×105 CFU/mL6.4 × 10 5 CFU / mL 0.2mL 0.2mL 99.9 99.9

이와 같은 조성물은 광촉매제인 이산화티타늄을 포함함으로써, 상기 표1 및 도 3에서와 같이 인체에 악 영향을 주는 악취, 세균등을 신속하고 효과적으로 제거시킬 수 있다.Such a composition includes titanium dioxide, which is a photocatalyst, to quickly and effectively remove odors, bacteria, and the like, which adversely affect the human body as shown in Table 1 and FIG. 3.

상기 금속편의 적용 실시예로는 휴대폰의 키패드로서 사용중에 손가락을 통하여 세균, 땀등의 이물질로 오염에도 불구하고 상기 조성물로 인한 살균으로 위생적으로 안전하게 된다.Application examples of the metal piece are hygienically safe by sterilization due to the composition despite contamination with foreign substances such as bacteria and sweat through the fingers during use as a keypad of the mobile phone.

또한 니켈, 크롬, 망간등을 더 포함시킴으로써 습기에 강하고 광촉매특성을 향상시켜 형광등과 같은 미세한 양의 빛에 의해서도 산화반응 작용이 이루어질 수 있게 하므로 가시광선 또는 자외선의 파장에서도 반응하여 악취, 세균의 제거를 효과적으로 할 수 있게 한다.It also contains nickel, chromium, and manganese, which is resistant to moisture and improves photocatalytic properties so that oxidation can be effected by minute amounts of light such as fluorescent lamps. To be effective.

한편, 상기와 같은 실시예들의 항균성 조성물들을 유제품용기, 비닐팩, 비닐랩등의 식품용기 표면에 코팅하거나 사출하여 식품용기를 성형하게 되면, 포장된 식품의 유통기한을 연장시킬 수 있다.On the other hand, if the antimicrobial compositions of the embodiments described above are coated or injected on the surface of the food container, such as dairy containers, plastic packs, plastic wrap, etc. to form a food container, it can extend the shelf life of the packaged food.

도 1은 본원 출원인의 실험에 의한 사진으로서, 이는 상기 제1실시예의 항균성 조성물을 표면에 코팅한 비닐팩(좌측사진)과 통상의 비닐팩(우측사진)에 사과를 각각 넣어서 1주일간 보관한 상태의 사진을 나타낸 것으로서, 통상의 비닐팩보다 항균성 조성물이 코팅된 비닐팩에 보관된 사과가 균이 번식되지 아니하고 장기간 보존될 수 있었음이 실험을 통해서 확인되었다.1 is a photograph obtained by the applicant's experiment, which is a photograph of a state in which an apple is placed in a plastic pack (left photograph) and a normal plastic pack (right photograph) coated on the surface of the antimicrobial composition of the first embodiment, and stored for one week As a result, it was confirmed through experiments that the apples stored in the plastic pack coated with the antimicrobial composition than the conventional plastic pack could be stored for a long time without breeding the bacteria.

다른 실험을 나타낸 도 2는, 상기 제1실시예의 항균성 조성물을 코팅한 식품용기(우측사진)와 통상의 식품용기(좌측사진)에 식빵을 각각 수용시키고 2주간 보관한 상태에서의 결과를 나타낸 사진으로서, 우측사진에 보관된 식빵이 곰팡이도 발생되지 아니하고 유통기한이 연장될 수 있었음이 확인되었다.Figure 2 showing another experiment is a photograph showing the results in a state in which the bread is accommodated in the food container (right picture) and the normal food container (left picture) coated with the antimicrobial composition of the first embodiment, respectively and stored for 2 weeks As a result, it was confirmed that the bread stored in the right picture could be extended without the occurrence of mold.

이와 같은 실험을 통하여 본 발명 실시예의 조성물로 이루어진 용기 또는 상기 실시예의 조성물이 코팅된 용기들은 식품의 보존년한을 연장시킨다.Through such experiments, containers made of the composition of the present invention or containers coated with the composition of the embodiment extend the shelf life of food.

상술한 바와 같은 본 발명은 상기 본원의 정신과 범위를 이탈함이 없이 상기 실시예에 한정되지 아니하고 많은 변형을 가하여 실시될 수 있다.The present invention as described above is not limited to the above embodiments without departing from the spirit and scope of the present application can be practiced with a number of modifications.

상술한 바와 같은 본 발명 항균성 수지 조성물은 광촉매제인 이산화티타늄을 포함함으로써, 인체에 악 영향을 주는 악취, 세균등을 신속하고 효과적으로 제거시킬 수 있다.As described above, the antimicrobial resin composition of the present invention includes titanium dioxide, which is a photocatalyst, to quickly and effectively remove odors, bacteria, and the like that adversely affect the human body.

또한 니켈, 크롬, 망간등을 더 포함시킴으로써 습기에 강하고 광촉매특성을 향상시켜 형광등과 같은 미세한 양의 빛에 의해서도 산화반응 작용이 이루어질 수 있게 하므로 가시광선 또는 자외선의 파장에서도 반응하여 악취, 세균의 제거를 효과적으로 할 수 있게 한다. It also contains nickel, chromium, and manganese, which is resistant to moisture and improves photocatalytic properties so that oxidation can be effected by minute amounts of light such as fluorescent lamps. To be effective.

또한, 상기 실시예들의 조성물로 이루어진 용기 또는 상기 실시예의 조성물이 코팅된 용기들은 식품의 보존년한을 연장시킨다.In addition, containers made of the compositions of the embodiments or containers coated with the compositions of the embodiments extend the shelf life of the food.

Claims (2)

항균성수지 조성물에 있어서,In the antimicrobial resin composition, 아크릴 멜라민수지 98~99.5 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5~2 중량%를 혼합하여 된 것을 특징으로 하는 항균성 수지 조성물.An antimicrobial resin composition comprising 98 to 99.5% by weight of acrylic melamine resin and 0.5 to 2% by weight of finely divided and oxidized titanium dioxide (TiO 2 ) of 5 to 30 μm by processing a titanium metal plate. 제 1 항에 있어서, 상기 아크릴 멜라민수지 99.45 중량%와, 티타늄 금속판을 가공하여 5~30㎛의 미세분말화하고 산화한 이산화티타늄(TiO2) 0.5중량%와, 니켈(Ni) 0.02중량%, 크롬(Cr) 0.02중량%, 망간(Mn) 0.01중량%로 이루어진 것을 특징으로 하는 항균성 수지 조성물.The method according to claim 1, wherein the acrylic melamine resin is 99.45% by weight, 0.5-30% by weight of finely divided and oxidized titanium dioxide (TiO 2 ) of 5-30 μm by processing a titanium metal plate, 0.02% by weight of nickel (Ni), An antimicrobial resin composition comprising 0.02% by weight of chromium (Cr) and 0.01% by weight of manganese (Mn).
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101254296B1 (en) * 2012-11-22 2013-04-12 동화홀딩스 주식회사 Manufacturing method of melamine resin having excellent gloss and adhesion and melamine resin using the manufacturing method
KR101717568B1 (en) * 2015-09-10 2017-03-17 이재현 Mobile Phone Case

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101254296B1 (en) * 2012-11-22 2013-04-12 동화홀딩스 주식회사 Manufacturing method of melamine resin having excellent gloss and adhesion and melamine resin using the manufacturing method
KR101717568B1 (en) * 2015-09-10 2017-03-17 이재현 Mobile Phone Case

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