TWI617628B - Protective composition - Google Patents
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Abstract
本發明提供一種保護性組合物，其包含分子量為25,000至200,000之聚合物及非離子型界面活性劑。本發明亦提供一種水轉印標籤，其包含(a)底襯層、(b)施加於該底襯層上之水溶性聚合物、(c)施加於該水溶性聚合物上之黏著劑組合物、(d)施加於該黏著劑組合物上之油墨層及(e)施加於該油墨層上之本發明保護性組合物。The present invention provides a protective composition comprising a polymer having a molecular weight of from 25,000 to 200,000 and a nonionic surfactant. The present invention also provides a water transfer label comprising (a) a backing layer, (b) a water soluble polymer applied to the backing layer, and (c) an adhesive combination applied to the water soluble polymer And (d) an ink layer applied to the adhesive composition and (e) a protective composition of the present invention applied to the ink layer.
Description
本發明係關於一種包含分子量為25,000至200,000之聚合物及非離子型界面活性劑之保護性組合物，以及利用該組合物所製得之水轉印標籤。The present invention relates to a protective composition comprising a polymer having a molecular weight of from 25,000 to 200,000 and a nonionic surfactant, and a water transfer label produced using the composition.
一般水轉印標籤之製作方式係以網版印刷方式塗附一層具有離型效果之樹脂聚合物於作為底襯層之紙或薄膜之上，接著以網版或平版之印刷方式將所需之油墨圖案塗佈於該樹脂聚合物層上而形成油墨層，再以如上述之印刷方法將黏著劑施加於該油墨層上，最後覆蓋一離型紙以保護該黏著劑。Generally, the water transfer label is produced by screen printing a resin polymer having a release effect on a paper or film as a backing layer, and then printing it in a screen or lithographic manner. An ink pattern is applied onto the resin polymer layer to form an ink layer, and an adhesive is applied to the ink layer by a printing method as described above, and finally a release paper is covered to protect the adhesive.
水轉印標籤之特點為可應用於形狀較複雜、不規則或體積較大之物體表面，已廣泛應用於腳踏車、高爾夫球杆、陶瓷、玩具等產品之轉印。The water transfer label is characterized by being applicable to the surface of objects with complicated shapes, irregularities or large volumes, and has been widely used for the transfer of bicycles, golf clubs, ceramics, toys and the like.
JP 2008-260174揭示一種水轉印紙，其包含一基底薄片，一水溶性離型層形成於該基底薄片上，一油墨層經印刷於該水溶性離型層上，一水基壓感黏著劑層塗附於該油墨層上，當該水基壓感黏著劑層浸潤於水中時可產生黏著力。JP 2008-260174 discloses a water transfer paper comprising a base sheet on which a water-soluble release layer is formed, an ink layer printed on the water-soluble release layer, and a water-based pressure-sensitive adhesive. A layer is applied to the ink layer to produce an adhesive force when the water-based pressure-sensitive adhesive layer is infiltrated in water.
一般而言，水轉印標籤之轉印步驟係先將其浸泡於含有水或水及溶劑(如2-丁氧乙醇)之共溶劑系統中一段時間，使得具有離型效果之樹脂聚合物膨潤並且溶解，再將水轉印標籤置於欲轉印之物體上，按壓該標籤以排除多餘之水及溶劑，接著撕除底襯層，最後再經乾燥及硬化之過程以完成轉印。In general, the transfer step of the water transfer label is first immersed in a cosolvent system containing water or water and a solvent such as 2-butoxyethanol for a period of time to swell the resin polymer having a release effect. And dissolving, then placing the water transfer label on the object to be transferred, pressing the label to remove excess water and solvent, then peeling off the backing layer, and finally drying and hardening to complete the transfer.
於轉印的過程中，可能因水轉印標籤之圖樣精細而造成細部皺折，增加轉印工序失敗的機率，且部分水轉印標籤因本身材質與離型力的要求，容易使得水轉印標籤產生霧化的缺陷，甚至影響圖樣色彩的選擇性。During the transfer process, fine wrinkles may occur due to the fine pattern of the water transfer label, which increases the probability of failure of the transfer process, and some water transfer labels are easy to make water transfer due to the requirements of the material and the release force. The printed label produces defects in fogging and even affects the color selectivity of the pattern.
本案發明人發現，本發明之保護性組合物可防止水轉印標籤上之圖樣產生皺折，並提供水轉印標籤所需的韌度，避免水轉印標籤於儲存、運送、轉印或加工時受損，同時，該保護性組合物具有易於撕除的特性，可使水轉印標籤的轉印工序較為簡便。The inventors have found that the protective composition of the present invention prevents wrinkles in the pattern on the water transfer label and provides the toughness required for the water transfer label to prevent the water transfer label from being stored, transported, transferred or The protective composition is damaged at the same time, and the protective composition has the property of being easily peeled off, and the transfer process of the water transfer label can be made simple.
本發明之一目的係提供一種保護性組合物，其包含：It is an object of the present invention to provide a protective composition comprising:
(1) 分子量為25,000至200,000之聚合物；及(1) a polymer having a molecular weight of from 25,000 to 200,000;
(2) 非離子型界面活性劑。(2) Nonionic surfactants.
本發明之又一目的係提供一種水轉印標籤，其包含：It is still another object of the present invention to provide a water transfer label comprising:
(a)底襯層；(a) a backing layer;
(b)施加於該底襯層上之水溶性聚合物；(b) a water soluble polymer applied to the backing layer;
(c)施加於該水溶性聚合物上之黏著劑組合物；(c) an adhesive composition applied to the water-soluble polymer;
(d)施加於該黏著劑組合物上之油墨層；及(d) an ink layer applied to the adhesive composition;
(e)施加於該油墨層上之本發明保護性組合物。(e) a protective composition of the invention applied to the ink layer.
為使本發明之特徵和優點能更明顯易懂，下文特舉較佳實施方式，並配合所附圖式詳細說明如下：In order to make the features and advantages of the present invention more comprehensible, the preferred embodiments are described below, and are described in detail with the accompanying drawings:
本發明係關於一種保護性組合物，其包含分子量為25,000至200,000之聚合物及非離子型界面活性劑。The present invention relates to a protective composition comprising a polymer having a molecular weight of from 25,000 to 200,000 and a nonionic surfactant.
適用於本發明保護性組合物中作為組份(1)之聚合物包括，但不限於，聚丙烯型聚合物、聚酯型聚合物、聚胺基甲酸酯型聚合物、乙烯乙酸乙烯酯型聚合物、三聚氰胺型聚合物、聚乙二醇型聚合物或其混合物。Polymers suitable as component (1) suitable for use in the protective composition of the present invention include, but are not limited to, polypropylene type polymers, polyester type polymers, polyurethane type polymers, ethylene vinyl acetate Type polymer, melamine type polymer, polyethylene glycol type polymer or a mixture thereof.
於該聚合物成分中，該聚丙烯型聚合物包括，但不限於，聚甲基丙烯酸酯、聚甲基丙烯酸丁酯、聚甲基丙烯酸環己酯、聚丙烯酸-2-乙基己酯或其混合物，且該聚酯型聚合物包，但不限於，聚對苯二甲酸乙二酯。Among the polymer components, the polypropylene type polymer includes, but is not limited to, polymethacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polyethyl-2-ethylhexyl acrylate or A mixture thereof, and the polyester type polymer is, but not limited to, polyethylene terephthalate.
本發明組合物中，聚合物之含量，以整體組合物總重量計，係約55重量%至約85重量%，較佳約65重量%至約80重量%。The amount of polymer in the compositions of the present invention is from about 55% by weight to about 85% by weight, preferably from about 65% by weight to about 80% by weight, based on the total weight of the total composition.
根據本發明之一具體實施例，本發明所使用之聚合物為聚甲基丙烯酸酯。According to a particular embodiment of the invention, the polymer used in the invention is a polymethacrylate.
本發明組合物之組份(2)為非離子型界面活性劑，其包括，但不限於，醇烷氧基化物、烷基酚烷氧基化物、山梨醇脂肪酸酯、多元醇脂肪酸酯、脂肪醇、聚氧乙二醇烷基酯、葡糖苷烷基醚、聚氧乙二醇辛基酚醚、聚氧乙二醇烷基酚醚、甘油烷基酯、椰油酸單乙醇醯胺、椰油酸二乙醇醯胺、十二烷基二甲基胺氧化物、泊咯沙姆(poloxamer，其係為聚氧乙烯及聚氧丙烯組成之聚合物)及其混合物。Component (2) of the composition of the present invention is a nonionic surfactant including, but not limited to, an alcohol alkoxylate, an alkylphenol alkoxylate, a sorbitan fatty acid ester, a polyol fatty acid ester , fatty alcohol, polyoxyethylene glycol alkyl ester, glucoside alkyl ether, polyoxyethylene glycol octylphenol ether, polyoxyethylene glycol alkyl phenol ether, glyceryl alkyl ester, cocoyl monoethanol oxime Amine, diethanolamine cocoamine, lauryl dimethylamine oxide, poloxamer (a polymer composed of polyoxyethylene and polyoxypropylene), and mixtures thereof.
於該非離子型界面活性劑成分中，該醇烷氧基化物為C6-20之醇烷氧基化物，該烷基酚烷氧基化物為C6-18之烷基酚烷氧基化物；該山梨醇脂肪酸酯為C50-75之山梨醇脂肪酸酯；該多元醇脂肪酸酯為C9-11之多元醇脂肪酸酯。In the nonionic surfactant component, the alcohol alkoxylate is a C 6-20 alcohol alkoxylate, and the alkyl phenol alkoxylate is a C 6-18 alkyl phenol alkoxylate; The sorbitan fatty acid ester is a C 50-75 sorbitan fatty acid ester; the polyol fatty acid ester is a C 9-11 polyol fatty acid ester.
本發明組合物中，非離子型界面活性劑之含量，以整體組合物總重量計，係約15重量%至約45重量%，較佳約15重量%至約30重量%。The nonionic surfactant is present in the compositions of the present invention at a level of from about 15% to about 45% by weight, preferably from about 15% to about 30% by weight, based on the total weight of the total composition.
根據本發明之一具體實施例，本發明所使用之非離子型界面活性劑包括壬苯醇醚、醇乙基氧化物、脂肪醇、聚山梨糖醇酯或聚氧乙烯山梨糖醇單油酸酯。According to a specific embodiment of the present invention, the nonionic surfactant used in the present invention comprises nonoxynol ether, alcohol ethyl oxide, fatty alcohol, polysorbate or polyoxyethylene sorbitan monooleate ester.
本發明組合物係非親水性，其可藉由將組份(2)之非離子型界面活性劑添加至溶於適當溶劑中之組份(1)的聚合物而製得，適當之製備溫度為室溫，較佳為15至40℃。適用之溶劑包括，但不限於，二甲苯、醋酸丁酯、甲苯、乙二醇***醋酸酯、丁二酸二甲酯、戊二酸二甲酯、己二酸二甲酯、醋酸乙酯、丁基酣醇、丙酮或丁酮。The composition of the present invention is non-hydrophilic, and can be obtained by adding the nonionic surfactant of the component (2) to the polymer of the component (1) dissolved in a suitable solvent, and suitably preparing the temperature. It is room temperature, preferably 15 to 40 °C. Suitable solvents include, but are not limited to, xylene, butyl acetate, toluene, ethylene glycol ethyl acetate, dimethyl succinate, dimethyl glutarate, dimethyl adipate, ethyl acetate, Butyl sterol, acetone or butanone.
本發明組合物具有3至25克/英吋之離型力，較佳為4至23克/英吋之離型力。The compositions of the present invention have a release force of from 3 to 25 grams per inch, preferably from 4 to 23 grams per inch.
圖1所示為本發明水轉印標籤之一具體實施例。本發明之水轉印標籤1通常為一種三明治結構，其包含底襯層11、水溶性聚合物12、黏著劑組合物13、油墨層14及保護性組合物15。Figure 1 shows a specific embodiment of the water transfer label of the present invention. The water transfer label 1 of the present invention is generally a sandwich structure comprising a backing layer 11, a water soluble polymer 12, an adhesive composition 13, an ink layer 14, and a protective composition 15.
適用於本發明水轉印標籤1中作為組份(a)之底襯層11較佳為透明或半透明之紙或薄膜包括，例如，但不限於，由聚酯、聚乙烯、聚氯乙烯、聚丙烯、聚醯胺、醋酸纖維素等所製成之積層紙或薄膜。Preferably, the backing layer 11 as component (a) suitable for use in the water transfer label 1 of the present invention is a transparent or translucent paper or film comprising, for example, but not limited to, polyester, polyethylene, polyvinyl chloride. , laminated paper or film made of polypropylene, polyamide, cellulose acetate, etc.
本發明水轉印標籤之組份(b)為水溶性聚合物12。適用於本發明之水溶性聚合物包括，但不限於，纖維素衍生物、黃原膠、***膠、明膠、卵磷脂或其共聚物。The component (b) of the water transfer label of the present invention is a water-soluble polymer 12. Water soluble polymers suitable for use in the present invention include, but are not limited to, cellulose derivatives, xanthan gum, gum arabic, gelatin, lecithin or copolymers thereof.
本發明水轉印標籤之組份(c)為黏著劑組合物13。適用於本發明之黏著劑組合物包括，但不限於，架橋劑、熱溶膠、聚氨酯、聚酯、壓克力膠、環氧樹酯或壓感膠，較佳為壓克力膠。The component (c) of the water transfer label of the present invention is the adhesive composition 13. Adhesive compositions suitable for use in the present invention include, but are not limited to, bridging agents, hot sols, polyurethanes, polyesters, acrylics, epoxies or pressure sensitive adhesives, preferably acrylics.
適合用於塗施該黏著劑組合物之方法包括印刷及諸如噴塗、圖案塗覆及帶塗等習用塗覆技術。可使用凹版印刷、平版印刷、柔性版印刷及網版印刷方法來達成黏著劑組合物印刷。Suitable methods for applying the adhesive composition include printing and conventional coating techniques such as spray coating, pattern coating and tape coating. Adhesive composition printing can be achieved using gravure, lithographic, flexographic, and screen printing methods.
本發明水轉印標籤之組份(d)為油墨層14，其可用於顯示產品標識、廣告、警告、裝飾或其它資訊之圖形、文字、符號或數字之印刷標記。The component (d) of the water transfer label of the present invention is an ink layer 14 which can be used to display printed indicia of graphics, characters, symbols or numbers of product identification, advertisements, warnings, decorations or other information.
適合用來塗施該油墨層之方法包括印刷及諸如噴塗、圖案塗覆及帶塗等習用塗覆技術。可使用凹版印刷、平版印刷、凸版印刷、橡皮版印刷、柔性版印刷點刻印刷、雷射印刷及網版印刷等方法來達成油墨層印刷。另外，可印刷不同類型的油墨。此等包括一及二組份油墨、氧化烘乾及紫外烘乾油墨、溶解油墨、分散油墨及100%油墨系統。Suitable methods for applying the ink layer include printing and conventional coating techniques such as spray coating, pattern coating, and tape coating. Ink layer printing can be achieved by methods such as gravure printing, lithography, letterpress printing, offset printing, flexographic printing, laser printing, and screen printing. In addition, different types of inks can be printed. These include one and two component inks, oxidative drying and UV drying inks, dissolving inks, dispersing inks and 100% ink systems.
本發明水轉印標籤之組份(e)為保護性組合物15，其可用於保護油墨層14，防止該油墨層所形成之圖案產生皺折的現象，並提供水轉印標籤所需的韌度，以避免油墨層於儲存、運送、轉印或加工時受損。此外，該保護性組合物具有易於撕除的特性，可使水轉印標籤的轉印過程較為簡便。適合用於塗施該保護性組合物之方法包括印刷及諸如噴塗、圖案塗覆及帶塗等習用塗覆技術。可使用凹版印刷、平版印刷、柔性版印刷及網版印刷方法來達成保護性組合物印刷。The component (e) of the water transfer label of the present invention is a protective composition 15 which can be used to protect the ink layer 14 from wrinkles in the pattern formed by the ink layer, and to provide a water transfer label. Toughness to avoid damage to the ink layer during storage, shipping, transfer or processing. Further, the protective composition has a property of being easily peeled off, and the transfer process of the water transfer label can be made simple. Suitable methods for applying the protective composition include printing and conventional coating techniques such as spray coating, pattern coating and tape coating. Printing of protective compositions can be achieved using gravure, lithographic, flexographic, and screen printing methods.
本發明水轉印標籤之使用方法係先將其浸泡於水數分鐘，再將該水轉印標籤置於欲轉印之物體上，移出底襯層11，接著利用橡皮刮刀將水轉印標籤與欲轉印物體間多餘的水及空氣排除以增強黏著效果，於室溫下放置約一小時後撕除保護性組合物15，最後於適當條件下再經乾燥及固化之過程以完成轉印。The water transfer label of the present invention is firstly immersed in water for several minutes, and then the water transfer label is placed on the object to be transferred, the backing layer 11 is removed, and then the water transfer label is transferred by a squeegee. Excess water and air are removed from the object to be transferred to enhance the adhesion. After leaving at room temperature for about one hour, the protective composition 15 is peeled off, and finally dried and cured under appropriate conditions to complete the transfer. .
此外，圖2所示為本發明水轉印標籤之一較佳具體實施例2，其包含底襯層21、水溶性聚合物22、黏著劑組合物23、油墨層24、金油層25及保護性組合物26。其中，金油層25之目的係可進一步保護油墨層24。In addition, FIG. 2 shows a preferred embodiment 2 of the water transfer label of the present invention, which comprises a backing layer 21, a water-soluble polymer 22, an adhesive composition 23, an ink layer 24, a gold oil layer 25, and protection. Composition 26. Among them, the purpose of the gold oil layer 25 is to further protect the ink layer 24.
本發明水轉印標籤可應用於表面能大於37達因/公分之各種基材表面，如聚合材料、金屬薄片或管件、塗料或玻璃或碳纖維材質，較佳為PU塗料、丙烯酸塗料或PU塗料及丙烯酸塗料的組成物。The water transfer label of the invention can be applied to various substrate surfaces with a surface energy greater than 37 dynes/cm, such as polymeric materials, foils or tubes, coatings or glass or carbon fiber materials, preferably PU coatings, acrylic coatings or PU coatings. And the composition of the acrylic paint.
本發明將經由下列實施例進一步加以詳細描述，唯該敘述僅係用以例示說明本發明，而非對本發明範圍作任何限制，任何熟悉此項技藝之人士可輕易達成之修飾及改變均包括於本案說明書揭示內容及所附申請專利範圍之範圍內。The present invention will be further described in detail by the following examples, which are not intended to be construed as limiting. The disclosure of the present specification is within the scope of the appended claims.
實施例Example
化學藥品chemical
1. DOWFAXTM 2A1：，DOW公司生產的陰離子界面活性劑。1. DOWFAX TM 2A1: An anionic surfactant produced by DOW.
2. DOWFAXTM 8390：烷基二苯基氧化物二磺酸鹽，DOW公司生產的陰離子界面活性劑。2. DOWFAX TM 8390: alkyl diphenyl oxide disulfonates, DOW company anionic surfactant.
3. TEXAPON N70T：月桂醇醚硫酸鈉，Cognis公司生產的陽離子界面活性劑。3. TEXAPON N70T: Sodium lauryl ether sulfate, a cationic surfactant produced by Cognis.
4. TERGITOL 15-S-9：乙氧基壬基酚，Dow公司生產的非離子型界面活性劑。4. TERGITOL 15-S-9: Ethoxynonylphenol, a nonionic surfactant produced by Dow.
5. ECOSURFTM EH-3及EH-9：醇乙基氧化物，DOW公司生產的非離子型界面活性劑。5. ECOSURF TM EH-3 and EH-9: alcohol ethyl oxide, a nonionic surfactant produced by DOW.
6. ECOSURFTM SA-7及SA-9：多元醇脂肪酸酯，DOW公司生產的非離子型界面活性劑。6. ECOSURF TM SA-7 and SA-9: polyhydric alcohol fatty acid esters, DOW produced nonionic surfactant.
7. 聚山梨糖醇酯80(Tween 80)：7. Polysorbate 80 (Tween 80):
8. CORUM 3553：可可胺丙基甜菜鹼，CORUM公司生產的兩性界面活性劑。8. CORUM 3553: Cocoapropylpropyl betaine, an amphoteric surfactant produced by CORUM.
保護性組合物之製備Preparation of protective composition
實例1至6及比較例1至4：Examples 1 to 6 and Comparative Examples 1 to 4:
將聚甲基丙烯酸酯溶於二甲苯中配製成50克(50wt%)之溶液，再分別取如表1所示實例1至6及比較例1至4之界面活性劑5克加入其中，攪拌均勻後，將其塗佈於一張已塗滿聚酯類油墨的A4大小紙張上，而製成實例1至6及比較例1至4之受測物，待乾燥後，即進行下述測試。The polymethacrylate was dissolved in xylene to prepare a 50 g (50 wt%) solution, and 5 g of the surfactants of Examples 1 to 6 and Comparative Examples 1 to 4 shown in Table 1 were respectively added thereto. After stirring uniformly, it was applied to an A4-size paper which had been coated with a polyester ink, and the test objects of Examples 1 to 6 and Comparative Examples 1 to 4 were prepared, and after drying, the following was carried out. test.
180°離型力測試180° release force test
將實例1至6及比較例1至4之A4尺寸大小的受測物先裁切成1英吋寬、10公分長之長條，並將此樣品長條末端利用型號9579雙面膠帶(購自3M公司)固定於一鋼材上，以12英吋/分鐘的速度剝離，測試各受測物之離型力。各實例皆進行三次(比較例3除外)，測試結果顯示於表2中。The A4 size samples of Examples 1 to 6 and Comparative Examples 1 to 4 were first cut into strips 1 inch wide and 10 cm long, and the end of the sample strip was made using model 9579 double-sided tape (purchased) It was fixed on a steel material from 3M Company and peeled off at a speed of 12 inches per minute to test the release force of each test object. Each example was performed three times (except Comparative Example 3), and the test results are shown in Table 2.
由上述實例應容易了解本發明之各種改良是可行的並且是熟諳此技者容易聯想到及預期的。It will be readily apparent from the above examples that various modifications of the invention are possible and are readily appreciated and contemplated by those skilled in the art.
圖1代表本發明水轉印紙之示意圖。Figure 1 represents a schematic view of a water transfer paper of the present invention.
圖2代表本發明水轉印紙之較佳實施態樣示意圖。Figure 2 is a schematic view showing a preferred embodiment of the water transfer paper of the present invention.
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100131799A TWI617628B (en) | 2011-09-02 | 2011-09-02 | Protective composition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100131799A TWI617628B (en) | 2011-09-02 | 2011-09-02 | Protective composition |
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| TW201311473A TW201311473A (en) | 2013-03-16 |
| TWI617628B true TWI617628B (en) | 2018-03-11 |
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| TW100131799A TWI617628B (en) | 2011-09-02 | 2011-09-02 | Protective composition |
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| CN104382565A (en) * | 2014-12-10 | 2015-03-04 | 罗利红 | Temperature measurement patch capable of monitoring infants for long term |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7156945B2 (en) * | 2002-04-24 | 2007-01-02 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure for in-mold decoration |
| US20070087171A1 (en) * | 2003-10-22 | 2007-04-19 | Kuraray Co. Ltd. | Method of hydraulic transfer and hydraulic transfer base film |
| US7662451B2 (en) * | 1998-07-29 | 2010-02-16 | W.A. Sanders Papierfabriek Coldenhove B.V. | Transfer paper for printing with an inkjet printer |
| CN101679651A (en) * | 2007-05-14 | 2010-03-24 | 株式会社可乐丽 | Roll of water-soluble polyvinyl alcohol film and method of storing the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662451B2 (en) * | 1998-07-29 | 2010-02-16 | W.A. Sanders Papierfabriek Coldenhove B.V. | Transfer paper for printing with an inkjet printer |
| US7156945B2 (en) * | 2002-04-24 | 2007-01-02 | Sipix Imaging, Inc. | Process for forming a patterned thin film structure for in-mold decoration |
| US20070087171A1 (en) * | 2003-10-22 | 2007-04-19 | Kuraray Co. Ltd. | Method of hydraulic transfer and hydraulic transfer base film |
| CN101679651A (en) * | 2007-05-14 | 2010-03-24 | 株式会社可乐丽 | Roll of water-soluble polyvinyl alcohol film and method of storing the same |
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