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1. 发明授权

US07641946B2 Adhesive film and image display device 有权
标题翻译：粘合膜和图像显示装置
公开(公告)号：US07641946B2
公开(公告)日：2010-01-05
申请号：US11489485
申请日：2006-07-20
申请人： Mika Kanamaru , Kenichi Okada , Toshitaka Takahashi
发明人： Mika Kanamaru , Kenichi Okada , Toshitaka Takahashi
IPC分类号： B32B33/00
CPC分类号： B32B33/00 , B32B7/12 , B32B2307/21 , C08K5/56 , C09J7/22 , C09J7/29 , C09J7/38 , C09J2201/128 , C09J2201/162 , C09J2205/106 , C09J2433/00 , G02F2201/50 , G02F2202/22 , G02F2202/28 , Y10T428/1036 , Y10T428/105 , Y10T428/1055 , Y10T428/1059 , Y10T428/1077 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/2891 , Y10T428/31935
摘要： An adhesive film prevents static charge on peeling generated when removed from an adherend and also improves adhesion between a base material and an adhesive layer, where an under coat layer containing an organometallic is formed on the base material and then an adhesive layer is formed on the base material. Alternatively, an adhesive film showing high adhesion with a glass substrate, and including an antistatic layer, which prevents static charge on peeling generated when the surface protective film is removed, and improves adhesion between a base material and an adhesive layer, where the adhesive film includes a base material, an adhesive layer made of a water dispersible adhesive including, and an antistatic layer, containing a water soluble or water dispersible conductive material, interposed between them, and the adhesive film is stuck onto an image display device.
摘要翻译：粘合剂膜防止从被粘物去除时产生的剥离时的静电荷，并且还提高基材和粘合剂层之间的粘附性，其中在基材上形成含有有机金属的底涂层，然后在基材上形成粘合剂层基材。或者，与玻璃基板相比，具有高粘合性的粘合剂膜，并且包括防静电层，其防止当去除表面保护膜时产生的剥离时的静电，并且改善基材和粘合剂层之间的粘合性，其中粘合剂膜包括基材，由水分散性粘合剂制成的粘合剂层和包含水溶性或水分散性导电材料的抗静电层，并且粘合剂膜粘附在图像显示装置上。

2. 发明授权

US08445103B2 Adhesive composition, adhesive optical film and image display device 有权
标题翻译：粘合剂组合物，胶粘剂光学膜和图像显示装置
公开(公告)号：US08445103B2
公开(公告)日：2013-05-21
申请号：US12801453
申请日：2010-06-09
申请人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
发明人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
IPC分类号： C08F30/02 , B32B27/30 , B32B7/12
CPC分类号： C08F220/18 , C08F220/06 , C08F220/26 , C08F230/02 , C08F230/08 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/31935
摘要： To provide an adhesive composition which shows high adhesion with a glass substrate and has excellent heat resistance, moisture resistance and moist heat resistance, an adhesive optical film comprising an adhesive layer made of the adhesive composition, which shows high adhesion between the adhesive layer and an optical film and effectively suppresses the occurrence of adhesive residue and lack of adhesive and also has excellent heat resistance, moisture resistance and moist heat resistance, and an image display device comprising the adhesive optical film, the adhesive optical film comprises an optical film 1, an adhesive layer 3 made of a water dispersible adhesive composition comprising, as raw monomers, an alkyl (meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer, and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers, an under coat layer 2 containing an oxazoline group-containing polymer, and being interposed between the optical film 1 and the adhesive layer 3, and the adhesive optical film is applied onto an image display device.
摘要翻译：为了提供一种粘合剂组合物，其与玻璃基板具有高粘附性并且具有优异的耐热性，耐湿性和耐湿热性，所述粘合剂光学膜包括由粘合剂组合物制成的粘合剂层，其在粘合剂层和粘合剂层之间显示出高粘合性光学膜，有效地抑制粘合剂残留的发生和粘合剂的缺乏，并且还具有优异的耐热性，耐湿性和耐湿热性，以及包含粘合光学膜的图像显示装置，粘合光学膜包括光学膜1，由水分散性粘合剂组合物制成的粘合剂层3，其包含作为原料单体的烷基具有4至18个碳原子的（甲基）丙烯酸烷基酯，含羧基的乙烯基单体，含磷酸基的乙烯基单体，和可任选地与上述单体共聚的可共聚的乙烯基单体，其中羧基原料单体中含有浓度为0.05〜1.50mmol / g，磷酸基浓度为0.01〜0.45mmol / g，含有含恶唑啉基的聚合物的底涂层2，介于光学膜1 和粘合剂层3，并且粘合光学膜被施加到图像显示装置上。

3. 发明申请

US20100304135A1 Adhesive composition, adhesive optical film and image display device 有权
公开(公告)号：US20100304135A1
公开(公告)日：2010-12-02
申请号：US12801453
申请日：2010-06-09
申请人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
发明人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
IPC分类号： B32B7/10
CPC分类号： C08F220/18 , C08F220/06 , C08F220/26 , C08F230/02 , C08F230/08 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/31935
摘要： To provide an adhesive composition which shows high adhesion with a glass substrate and has excellent heat resistance, moisture resistance and moist heat resistance, an adhesive optical film comprising an adhesive layer made of the adhesive composition, which shows high adhesion between the adhesive layer and an optical film and effectively suppresses the occurrence of adhesive residue and lack of adhesive and also has excellent heat resistance, moisture resistance and moist heat resistance, and an image display device comprising the adhesive optical film, the adhesive optical film comprises an optical film 1, an adhesive layer 3 made of a water dispersible adhesive composition comprising, as raw monomers, an alkyl (meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer, and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers, an under coat layer 2 containing an oxazoline group-containing polymer, and being interposed between the optical film 1 and the adhesive layer 3, and the adhesive optical film is applied onto an image display device.

4. 发明申请

US20060188712A1 Adhesive composition, adhesive optical film and image display device 有权
标题翻译：粘合剂组合物，胶粘剂光学膜和图像显示装置
公开(公告)号：US20060188712A1
公开(公告)日：2006-08-24
申请号：US11337838
申请日：2006-01-24
申请人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
发明人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
IPC分类号： C08F30/02 , B32B27/30 , B32B7/12
CPC分类号： C08F220/18 , C08F220/06 , C08F220/26 , C08F230/02 , C08F230/08 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/31935
摘要： To provide an adhesive composition which shows high adhesion with a glass substrate and has excellent heat resistance, moisture resistance and moist heat resistance, an adhesive optical film comprising an adhesive layer made of the adhesive composition, which shows high adhesion between the adhesive layer and an optical film and effectively suppresses the occurrence of adhesive residue and lack of adhesive and also has excellent heat resistance, moisture resistance and moist heat resistance, and an image display device comprising the adhesive optical film, the adhesive optical film comprises an optical film 1, an adhesive layer 3 made of a water dispersible adhesive composition comprising, as raw monomers, an alkyl(meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer, and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers, an under coat layer 2 containing an oxazoline group-containing polymer, and being interposed between the optical film 1 and the adhesive layer 3, and the adhesive optical film is applied onto an image display device.
摘要翻译：为了提供一种粘合剂组合物，其与玻璃基板具有高粘附性并且具有优异的耐热性，耐湿性和耐湿热性，所述粘合剂光学膜包括由粘合剂组合物制成的粘合剂层，其在粘合剂层和粘合剂层之间显示出高粘合性光学膜，有效地抑制粘合剂残留的发生和粘合剂的缺乏，并且还具有优异的耐热性，耐湿性和耐湿热性，以及包含粘合光学膜的图像显示装置，粘合光学膜包括光学膜1，由水分散性粘合剂组合物制成的粘合剂层3，其包含作为原料单体的烷基具有4至18个碳原子的（甲基）丙烯酸烷基酯，含羧基的乙烯基单体，含磷酸基的乙烯基单体，和可任选地与上述单体共聚的可共聚的乙烯基单体，其中羧基原料单体中含有浓度为0.05〜1.50mmol / g，磷酸基浓度为0.01〜0.45mmol / g，含有含恶唑啉基的聚合物的底涂层2，介于光学膜1 和粘合剂层3，并且粘合光学膜被施加到图像显示装置上。

5. 发明授权

US07759442B2 Adhesive composition, adhesive optical film and image display device 有权
标题翻译：粘合剂组合物，胶粘剂光学膜和图像显示装置
公开(公告)号：US07759442B2
公开(公告)日：2010-07-20
申请号：US11337838
申请日：2006-01-24
申请人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
发明人： Kenichi Okada , Toshitaka Takahashi , Mika Kanamaru , Michio Umeda
IPC分类号： C08F30/02 , B32B27/30 , B32B7/12
CPC分类号： C08F220/18 , C08F220/06 , C08F220/26 , C08F230/02 , C08F230/08 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/31935
摘要： To provide an adhesive composition which shows high adhesion with a glass substrate and has excellent heat resistance, moisture resistance and moist heat resistance, an adhesive optical film comprising an adhesive layer made of the adhesive composition, which shows high adhesion between the adhesive layer and an optical film and effectively suppresses the occurrence of adhesive residue and lack of adhesive and also has excellent heat resistance, moisture resistance and moist heat resistance, and an image display device comprising the adhesive optical film, the adhesive optical film comprises an optical film 1, an adhesive layer 3 made of a water dispersible adhesive composition comprising, as raw monomers, an alkyl (meth)acrylate ester whose alkyl group has 4 to 18 carbon atoms, a carboxyl group-containing vinyl monomer, a phosphoric acid group-containing vinyl monomer, and a copolymerizable vinyl monomer which is optionally copolymerizable with the above monomers, wherein a carboxyl group concentration is from 0.05 to 1.50 mmol/g and a phosphoric acid group concentration is from 0.01 to 0.45 mmol/g in the raw monomers, an under coat layer 2 containing an oxazoline group-containing polymer, and being interposed between the optical film 1 and the adhesive layer 3, and the adhesive optical film is applied onto an image display device.
摘要翻译：为了提供一种粘合剂组合物，其与玻璃基板具有高粘附性并且具有优异的耐热性，耐湿性和耐湿热性，所述粘合剂光学膜包括由粘合剂组合物制成的粘合剂层，其在粘合剂层和粘合剂层之间显示出高粘合性光学膜，有效地抑制粘合剂残留的发生和粘合剂的缺乏，并且还具有优异的耐热性，耐湿性和耐湿热性，以及包含粘合光学膜的图像显示装置，粘合光学膜包括光学膜1，由水分散性粘合剂组合物制成的粘合剂层3，其包含作为原料单体的烷基具有4至18个碳原子的（甲基）丙烯酸烷基酯，含羧基的乙烯基单体，含磷酸基的乙烯基单体，和可任选地与上述单体共聚的可共聚的乙烯基单体，其中羧基原料单体中含有浓度为0.05〜1.50mmol / g，磷酸基浓度为0.01〜0.45mmol / g，含有含恶唑啉基的聚合物的底涂层2，介于光学膜1 和粘合剂层3，并且粘合光学膜被施加到图像显示装置上。

6. 发明申请

US20070031660A1 Adhesive film and image display device 有权
标题翻译：粘合膜和图像显示装置
公开(公告)号：US20070031660A1
公开(公告)日：2007-02-08
申请号：US11489485
申请日：2006-07-20
申请人： Mika Kanamaru , Kenichi Okada , Toshitaka Takahashi
发明人： Mika Kanamaru , Kenichi Okada , Toshitaka Takahashi
IPC分类号： B32B7/12 , B32B27/30 , B32B37/00
CPC分类号： B32B33/00 , B32B7/12 , B32B2307/21 , C08K5/56 , C09J7/22 , C09J7/29 , C09J7/38 , C09J2201/128 , C09J2201/162 , C09J2205/106 , C09J2433/00 , G02F2201/50 , G02F2202/22 , G02F2202/28 , Y10T428/1036 , Y10T428/105 , Y10T428/1055 , Y10T428/1059 , Y10T428/1077 , Y10T428/2843 , Y10T428/2848 , Y10T428/2852 , Y10T428/2891 , Y10T428/31935
摘要： An adhesive film prevents static charge on peeling generated when removed from an adherend and also improves adhesion between a base material and an adhesive layer, where an under coat layer containing an organometallic is formed on the base material and then an adhesive layer is formed on the base material. Alternatively, an adhesive film showing high adhesion with a glass substrate, and including an antistatic layer, which prevents static charge on peeling generated when the surface protective film is removed, and improves adhesion between a base material and an adhesive layer, where the adhesive film includes a base material, an adhesive layer made of a water dispersible adhesive including, and an antistatic layer, containing a water soluble or water dispersible conductive material, interposed between them, and the adhesive film is stuck onto an image display device.
摘要翻译：粘合剂膜防止从被粘物去除时产生的剥离时的静电荷，并且还提高基材和粘合剂层之间的粘附性，其中在基材上形成含有有机金属的底涂层，然后在基材上形成粘合剂层基材。或者，与玻璃基板相比，具有高粘合性的粘合剂膜，并且包括防静电层，其防止当去除表面保护膜时产生的剥离时的静电，并且改善基材和粘合剂层之间的粘合性，其中粘合剂膜包括基材，由水分散性粘合剂制成的粘合剂层和包含水溶性或水分散性导电材料的抗静电层，并且粘合剂膜粘附在图像显示装置上。

7. 发明授权

US09029468B2 Adhesive layer for optical film, optical film having adhesive layer, image display device, and detachment method for optical film 有权
标题翻译：用于光学膜的粘合剂层，具有粘合剂层的光学膜，图像显示装置和用于光学膜的剥离方法
公开(公告)号：US09029468B2
公开(公告)日：2015-05-12
申请号：US13988631
申请日：2011-11-18
申请人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Taiki Shimokuri , Yousuke Makihata
发明人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Taiki Shimokuri , Yousuke Makihata
IPC分类号： B32B38/10 , C09J133/08 , C09J7/02 , C08L33/02 , C09J133/04 , G02F1/1335 , C09D133/08 , C09J7/00 , C08K3/36
CPC分类号： C09J133/08 , B32B38/10 , C08K3/36 , C08L33/02 , C08L2201/54 , C09D133/08 , C09J7/00 , C09J7/10 , C09J7/385 , C09J133/04 , C09J2201/606 , C09J2201/622 , C09J2203/318 , C09J2205/102 , C09J2433/00 , G02F1/1335 , G02F1/133528 , G02F2202/28 , Y10T156/11 , Y10T428/2891
摘要： A pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition is an aqueous dispersion comprising a water-dispersible (meth)acryl-based copolymer (A) having a glass transition temperature from −55° C. to less than 0° C.; and a water-soluble or water-dispersible component (B) having a glass transition temperature of 0° C. or more, a mixture ratio (A)/(B) is in the range of 50-97/3-50, the component (B) forms domains with maximum lengths between 1 nm and 200 nm in a resin component made of the (meth)acryl-based copolymer (A), and the pressure-sensitive adhesive layer has a haze value (H20) of 1% or less when having a thickness of 20 μm. The pressure-sensitive adhesive layer for an optical film, which is made from an aqueous dispersion-type pressure-sensitive adhesive composition has good reworkability or recyclability, and has a sufficient level of durability.
摘要翻译：一种由水分散型压敏粘合剂组合物制成的用于光学膜的压敏粘合剂层，其中所述水性分散型压敏粘合剂组合物是包含水分散性（甲基）丙烯酸类共聚物（A）的玻璃化转变温度为-55℃至小于0℃; 和玻璃化转变温度为0℃以上的水溶性或水分散性成分（B），混合比（A）/（B）在50-97 / 3-50的范围内，在（甲基）丙烯酸系共聚物（A）的树脂成分中，成分（B）形成最大长度在1nm〜200nm之间的区域，该粘合剂层的雾度值（H 2 O）为1％或更小。由水分散型压敏粘合剂组合物制成的用于光学膜的压敏粘合剂层具有良好的再加工性或可再循环性，并且具有足够的耐久性。

8. 发明申请

US20130248118A1 ADHESIVE LAYER FOR OPTICAL FILM, OPTICAL FILM HAVING ADHESIVE LAYER, IMAGE DISPLAY DEVICE, AND DETACHMENT METHOD FOR OPTICAL FILM 有权
标题翻译：用于光学胶片的粘合层，具有粘合层的光学膜，图像显示装置和用于光学膜的分离方法
公开(公告)号：US20130248118A1
公开(公告)日：2013-09-26
申请号：US13988631
申请日：2011-11-18
申请人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Taiki Shimokuri , Yousuke Makihata
发明人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Taiki Shimokuri , Yousuke Makihata
IPC分类号： C09J133/08 , B32B38/10 , C09J7/02
CPC分类号： C09J133/08 , B32B38/10 , C08K3/36 , C08L33/02 , C08L2201/54 , C09D133/08 , C09J7/00 , C09J7/10 , C09J7/385 , C09J133/04 , C09J2201/606 , C09J2201/622 , C09J2203/318 , C09J2205/102 , C09J2433/00 , G02F1/1335 , G02F1/133528 , G02F2202/28 , Y10T156/11 , Y10T428/2891
摘要： A pressure-sensitive adhesive layer for an optical film made from an aqueous dispersion-type pressure-sensitive adhesive composition, wherein the aqueous dispersion-type pressure-sensitive adhesive composition is an aqueous dispersion comprising a water-dispersible (meth)acryl-based copolymer (A) having a glass transition temperature from −55° C. to less than 0° C.; and a water-soluble or water-dispersible component (B) having a glass transition temperature of 0° C. or more, a mixture ratio (A)/(B) is in the range of 50-97/3-50, the component (B) forms domains with maximum lengths between 1 nm and 200 nm in a resin component made of the (meth)acryl-based copolymer (A), and the pressure-sensitive adhesive layer has a haze value (H20) of 1% or less when having a thickness of 20 μm. The pressure-sensitive adhesive layer for an optical film, which is made from an aqueous dispersion-type pressure-sensitive adhesive composition has good reworkability or recyclability, and has a sufficient level of durability.
摘要翻译：一种由水分散型压敏粘合剂组合物制成的用于光学膜的压敏粘合剂层，其中所述水性分散型压敏粘合剂组合物是包含水分散性（甲基）丙烯酸类共聚物（A）的玻璃化转变温度为-55℃至小于0℃; 和玻璃化转变温度为0℃以上的水溶性或水分散性成分（B），混合比（A）/（B）在50-97 / 3-50的范围内，在（甲基）丙烯酸系共聚物（A）的树脂成分中，成分（B）形成最大长度在1nm〜200nm之间的区域，该粘合剂层的雾度值（H 2 O）为1％或更小。由水分散型压敏粘合剂组合物制成的用于光学膜的压敏粘合剂层具有良好的再加工性或可再循环性，并且具有足够的耐久性。

9. 发明申请

US20130095298A1 PRESSURE-SENSITIVE ADHESIVE LAYER, PRESSURE-SENSITIVE ADHESIVE FILM, AND OPTICAL DEVICE 有权
标题翻译：压敏粘合层，压敏粘合膜和光学装置
公开(公告)号：US20130095298A1
公开(公告)日：2013-04-18
申请号：US13805957
申请日：2011-06-20
申请人： Kayo Shimokawa , Kenichi Okada , Toshitaka Takahashi , Yoshiaki Kitani , Taiki Shimokuri , Yousuke Makihata
发明人： Kayo Shimokawa , Kenichi Okada , Toshitaka Takahashi , Yoshiaki Kitani , Taiki Shimokuri , Yousuke Makihata
IPC分类号： C09J7/02 , G02B5/00
CPC分类号： C09J7/0207 , C08L2201/50 , C09J7/22 , C09J7/38 , C09J133/04 , C09J2201/622 , C09J2203/318 , C09J2433/00 , G02B5/00 , Y10T428/24479 , Y10T428/24612
摘要： A pressure-sensitive adhesive layer is obtained by applying and drying an aqueous dispersion type pressure-sensitive adhesive composition. On a surface of the pressure-sensitive adhesive layer, the number of a concave portion having a depth in a thickness direction of 0.2 to 20 μm and a maximum length along the surface of 1 to 10 mm is 5 or less per 1 m2.
摘要翻译：通过涂布和干燥水分散型压敏粘合剂组合物获得压敏粘合剂层。在压敏粘合剂层的表面上，厚度方向为0.2〜20μm的凹部的数量和表面的最大长度为1〜10mm，每1m2为5个以下。

10. 发明授权

US10266629B2 Pressure-sensitive adhesive composition for optical film, pressure-sensitive adhesive layer for optical film, pressure-sensitive adhesive optical film, and image display device 有权
公开(公告)号：US10266629B2
公开(公告)日：2019-04-23
申请号：US13641904
申请日：2011-05-16
申请人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Yousuke Makihata , Taiki Shimokuri , Shusaku Goto , Takeharu Kitagawa , Minoru Miyatake , Tomohiro Mori , Takashi Kamijo
发明人： Kunihiro Inui , Toshitsugu Hosokawa , Takaaki Ishii , Masayuki Satake , Kenichi Okada , Toshitaka Takahashi , Yousuke Makihata , Taiki Shimokuri , Shusaku Goto , Takeharu Kitagawa , Minoru Miyatake , Tomohiro Mori , Takashi Kamijo
IPC分类号： C08F265/06 , C08F220/06 , C09J151/06 , C08F220/18
摘要： An aqueous dispersion-type pressure-sensitive adhesive composition for an optical film includes a emulsion particles of a core-shell structure, wherein the emulsion particles include a (meth)acryl-based copolymer (A) having a glass transition temperature of −55° C. to 0° C. and a (meth)acryl-based copolymer (B) having a glass transition temperature of 0° C. to 180° C., in a single emulsion particle, one of the copolymers (A) and (B) forms a core layer, and another forms a shell layer, at least one of the copolymers (A) and (B) contains a carboxyl group-containing monomer, a difference of the glass transition temperatures between the copolymers (A) and (B) is 50° C. or more, and a ratio (A)/(B) (by weight) is in the range of 50/50 to 90/10.

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