Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/30—Multi-ply
  • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/21—Paper; Textile fabrics
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
  • C09J2203/31—Applications of adhesives in processes or use of adhesives in the form of films or foils as a masking tape for painting
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/28—Presence of paper
  • C09J2400/283—Presence of paper in the substrate
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
  • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration

Definitions

• the present invention relates to a paper backing, and more particularly, to a paper backing for supporting a secondary layer.
• second layer refers to the layer to be supported on a paper backing by that paper backing, or in other words, to the layer to be additionally or incidentally formed on a paper backing. Examples include various types of layers or films such as an adhesive layer, coating layer or ink layer.
• the present invention also relates to the use of said paper backing, and more particularly, to an adhesive sheet that uses the paper backing of the present invention.
• the adhesive sheet of the present invention particularly in the case of using it as a masking material, is able to be torn in a desired shape and perform proper masking without impairing hand-tearability.
• hand-tearability refers to being able to be torn well along a desired tearing line when the paper backing is torn by hand, and accordingly, there is no occurrence of the problem of, for example, separation occurring between the upper and lower layers in a paper layer, causing only the upper layer to be torn, while the bottom layer at least partially remains.
• Japanese Patent No. 2589357 relates to a porous backing invented to solve the problems of porous backing for adhesive sheet of the prior art as described above.
• the fibrous substance density differs between a first layer side and a second surface layer side
• rubber and/or synthetic resin is impregnated into a porous tissue material composed of a fibrous substance in which the fibrous substance density of a first surface layer side is greater than the fibrous substance density of a second surface layer side, and that impregnated amount is greater on a first surface layer side than a second surface layer side.
• a first surface layer side of a porous thin leaf material that composes said porous backing is formed from a fibrous substance in which the fibrous substance density is higher than a second surface layer side (namely, Kraft paper, crepe paper or Japanese paper, and preferably Japanese paper composed of a blend of beaten wood pulp and synthetic short fiber), in this type of fibrous substance, in the case of attempting to change the blending ratio of wood pulp and synthetic short fiber, several problems cannot be avoided.
• the present invention provides an improved backing that can be torn and cut without impairing hand-tearability when used as the backing of an adhesive sheet, and can be cleanly peeled off without being accompanied by slivering or breaking of the sheet following use of the adhesive sheet.
• the present invention also provides an improved adhesive sheet that can be advantageously used as a masking material in particular.
• the present invention provides a paper backing for supporting a secondary layer which has a double-layer paper structure comprising a first paper layer and a second paper layer, said first paper layer and said second paper layer each being manufactured from wood pulp and short fiber, wherein the first paper layer and the second paper layer have a different blending ratio of short fibers to wood pulp.
• the present invention provides an adhesive sheet comprising a paper backing and an adhesive layer provided on one of its surfaces, said paper backing having a double-layer paper structure comprising a first paper layer and a second paper layer, in which said first paper layer and said second paper layer each is manufactured from wood pulp and short fiber, wherein the first paper layer and the second paper layer have a different blending ratio of short fibers to wood pulp, and said adhesive layer being provided on the surface of said first paper layer having said blending ratio of short fibers to wood pulp that is larger than the blending ratio of short fibers to wood pulp of said second paper layer.
• said paper backing in addition to rubber and/or synthetic resin impregnated throughout its entirety, also preferably has a top coating layer on the surface of said second paper layer located on the opposite side of said first paper layer. It is also preferable that said adhesive sheet can be used advantageously particularly as a masking material.
• the paper backing according to the present invention is characterized by providing a difference in the blending ratios of short fiber in the wood pulp and short fibers, that respectively constitute the paper layers, between the first paper layer and the second paper layer.
• the short fiber "blending ratio” refers to the blending ratio of short fiber to wood pulp contained in the pulp liquid when paper is made from wood pulp and short fiber.
• Paper is made from wood pulp and short fiber by a process which includes the steps of, after adding water to beaten wood pulp to form a gruel, a pulp liquid is prepared by adding short fiber after which this pulp liquid is made into paper with a paper machine.
• the present invention is characterized by a paper backing comprising a first paper layer and a second paper layer wherein the first paper layer has a larger fiber blending ratio than the second paper layer, which is presently a single paper layer.
• the paper backing according to the present invention is especially designed to support a secondary layer.
• a double-layer paper structure comprising a first paper layer and a second paper layer, and said first paper layer and said second paper layer are manufactured from wood pulp and short fibers, and the first paper layer and the second paper layer have a different blending ratio of short fibers and wood pulp.
• the wood pulp used as a first blending component can be wood pulp that is typically used as a papermaking raw material in the field of papermaking, and is normally beaten wood pulp.
• the short fiber used as the second blending component can similarly be short fiber typically used as a papermaking raw material in the field of papermaking, and includes various types of natural or synthetic short fibers.
• suitable short fiber include synthetic short fiber such as polyvinyl alcohol fibers called under the general name "vinylon", polyamide fibers, for example, polyamide fibers commercially available from E. I.
• nylon du Pont, Wilmington, Delaware, under the trade designation "Nylon", polyester, polyethylene, polypropylene, polyurethane, polyvinyl chloride, polyvinylidene chloride and polyacrylonitrile, semi- synthetic short fiber such as cellulose, regenerated short fiber such as rayon, natural short fiber such as bast, seed fiber, nerve, fruit, fur and asbestos, and inorganic short fiber such as glass and metal.
• synthetic short fiber can be advantageously used as the second blending component.
• the length of this short fiber is preferably within the range of about 3 to 20 mm.
• the blending ratio of short fiber relative to wood pulp is preferably about 50% or less.
• the respective blending ratios in these two paper layers are not identical. There is no particular limitation on the difference in blending ratios between the two. The difference may be small, for example, on the order of a few percent, or may be a larger difference of about 20 to 30%. However, since poor hand-tearability may occur if the difference in blending ratios between the two exceeds 50%, normally the difference in blending ratios is preferably less than 50%.
• the paper backing of the present invention is to he used in the manufacture of an adhesive sheet for the purpose of masking
• the tearing that occurs during separation after the resulting adhesive sheet is applied to the adhered object may be affected by the difference in blending ratios between the first paper layer and second paper layer. For example, even if the blending ratios are increased if the blending ratios end up being inverted between the first and second layers, poor slivering
• the difference in blending ratios in the first and second paper layers preferably is accomplished in the preparation stage of each paper layer by changing the blending proportions of wood pulp and short fiber in recognition of the blending ratio finally desired.
• the first paper layer preferably has the largest blending ratio of short fiber, and an adhesive layer is provided on the surface of this first paper layer as will be explained in detail below.
• the making of a double-layer combination structure by producing, in combination, first and second paper layers as described above is advantageously carried out by combining a first paper layer and second paper layer into an integrated unit to an extent that the interfaces of both cannot be recognized after separately manufacturing said first and second paper layers according to a papermaking method that uses, for example, an apparatus used in the manufacturing of cardboard, such as a multi-layer former.
• a papermaking method that uses, for example, an apparatus used in the manufacturing of cardboard, such as a multi-layer former.
• it is preferable to adjust the basis weight (g/m 2 ) of the first and second paper layers so that basis weight ratio of the first layer to the second layer is 95:5 to 5:95. Paper backing in which the basis weight ratio has been adjusted in this manner is able to demonstrate improved physical strength, including tearing strength, breaking strength and interlayer strength, in the first paper layer.
• the paper backing of the present invention can be advantageously used for the manufacturing of products supporting various additional layers, and can be used particularly advantageously in the manufacturing of adhesive sheet.
• Adhesive sheet normally has a constitution that contains the paper backing of the present invention along with an adhesive layer provided on one of its surfaces, and preferably, the adhesive layer is provided on the surface of the first paper layer which has the larger blending ratio of short fiber to wood pulp, as compared to the second paper layers.
• the adhesive sheet of the present invention may have another layer on the same side as the adhesive layer or on the opposite side of the adhesive layer.
• An example of such a layer is a release layer.
• the adhesive sheet of the present invention can be used particularly advantageously as a masking material in painting work and so forth.
• the paper backing additionally contain a water- dispersed impregnant impregnated throughout the paper backing, and preferably a water- dispersed impregnant containing for its main ingredient rubber, synthetic resin or a combination thereof, and have a top coating layer on the surface of the second paper layer located on the opposite side from the first paper layer.
• Examples of rubber that can be used advantageously as water-dispersed impregnant in the manufacturing of the adhesive sheet of the present invention include natural rubber, synthetic isoprene rubber, butyl rubber, styrene butadiene rubber and acrylic rubber.
• examples of synthetic resin that can similarly be used advantageously include acrylic resin.
• the preferable impregnated amounts of these impregnants when explained on the basis of their solid content, are normally within the range of 1 to 30 g/m 2 and preferably within the range of 5 to 20 g/m 2 . If the impregnated amount of impregnant in the paper backing is less than 1 g/m , fiber bundling may become insufficient thereby preventing use as the backing of an adhesive sheet for masking.
• the paper backing may tear between the first and second paper layers and some of the layer(s) may remain behind thereby preventing the paper backing from being peeled off again.
• the impregnated amount of impregnant exceeds 30 g/m 2 , since the rigidity of the backing may become excessively strong, tearing strength may decrease which may result in the loss of the effect of addition of short fiber.
• the backing may end up being a resin film consisting primarily of paper.
• Application of said impregnant to the paper backing can be performed in accordance with various techniques, preferable examples of which include coating, size pressing and immersion.
• the top coating layer to be applied to the surface of the second paper layer can he formed from various top coating agents.
• Preferable examples of top coating agents include
• an adhesive sheet for the purpose of masking by using a paper backing manufactured by combining a first paper layer and second paper layer and impregnating with rubber and/or synthetic resin in the manner described above can be performed in accordance with various procedures.
• it can be performed by first applying the above-mentioned top coating agent to the surface of the second paper layer of the paper backing to form a top coating layer, and then providing a layer of a weakly adhesive material such as silicon resin or long-chain alkyl ester resin on top of that layer in the form of a back treatment agent.
• an adhesive layer can be formed by applying a routinely used adhesive such as natural rubber or acrylic rubber as described above to the surface of the first paper layer among the surfaces of the paper backing (surface not in contact with the second paper layer).
• first paper layer and second paper layer were combined into a single unit to the extent that the interfaces of both paper layers could not be distinguished by a papermaking method that uses a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• An impregnant in the form of acrylic resin emulsion was impregnated throughout the resulting paper backing
• Acrylic adhesive for masking product name: MT TACK5268ER, commercially available from Mitsui Chemical, Japan
• an acrylic pressure-sensitive adhesive was applied to the surface of a first paper layer of the acrylic resin-impregnated paper backing prepared in the above-mentioned step (containing vinylon short fiber) to form an adhesive layer having a film thickness of 30 ⁇ m.
• Sumikaflex registered trade name, commercially available from Sumitomo Chemical, Japan
• a polyvinylacetate emulsion was applied to the surface of the second paper layer not containing vinylon short fiber at a covering amount of 3 g/m and dried.
• Long-chain alkyl acrylic resin (as a separation promoter) was then applied on top of the above-mentioned polyvinylacetate emulsion at a covering amount of 0.05 g/m and dried.
• an adhesive tape was obtained having an adhesive layer on one side of the paper backing.
• Example 1 The procedure described in Example 1 was repeated except as follows.
• the blending ratio of vinylon short fiber in the first paper layer was increased from 20% by weight to 30% by weight as shown in Table 1.
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not be distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Example 1.
• Example 1 The procedure described in Example 1 was repeated except as follows.
• the blending ratio of vinylon short fiber in the first paper layer was kept at 20% by weight
• vinylon short fiber was blended into the second paper layer, which had previously used a vinylon short fiber blending ratio of 0% by weight, according to the procedure described in the above-mentioned Example 1 to obtain a blending ratio of 10% by weight as described in Table 1.
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not be distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Example 1.
• Example I The procedure described in Example I was repeated except as follows.
• the blending ratio of vinylon short fiber in the first paper layer was increased from 20% by weight to 30% by weight, and vinylon short fiber was blended into the second paper layer, which had previously used a vinylon short fiber blending ratio of 0% by weight, according to the procedure described in the above-mentioned Example 1 to obtain a blending ratio of 10% by weight as described in Table 1.
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not be distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m .
• a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Example 1.
• Example 1 The procedure described in the above-mentioned Example 1 was repeated except as follows.
• a paper backing consisting of a single layer was prepared instead of the paper backing having a double-layer combined structure for the sake of comparison. Namely, 20% by weight of vinylon (commercially available from Kurare) was mixed with beaten wood pulp to prepare a pulp gruel after which the pulp gruel was formed into paper having a basis weight of 20 g/m 2 with a papermaking machine.
• a single-layer paper backing was obtained having the appearance of Japanese paper and a basis weight of 40 g/m .
• Example 1 The procedure described in the above-mentioned Example 1 was repeated except as follows.
• the blending ratio of vinylon short fiber was changed so that it was greater in the second paper layer than in the first paper layer in a paper backing having a double-layer combined structure for the sake of comparison.
• a pulp gruel was prepared from beaten wood pulp and this pulp gruel was formed into paper having a basis weight of 20 g/m 2 with a paprmaking machine to prepare a first paper layer not containing vinylon short fiber.
• an amount equal to 20% by weight (based on the total amount) of polyvinyl alcohol (vinylon) short fiber length: approx.
• the first paper layer and second paper layer were combined into a single unit to the extent that the interfaces of both paper layers could not be distinguished by a papermaking method that uses a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• an impregnant in the form of acrylic resin emulsion was impregnated throughout the resulting paper backing under the condition that the impregnated amount of solid portion was 5 g/m .
• the hand-tearability of the acrylic resin-impregnated paper backing obtained in this manner was evaluated according to the procedure described in the above-mentioned Example 1, the results described in Table 1 were obtained.
• An acrylic pressure-sensitive adhesive was applied to the surface of a first paper layer of the acrylic resin-impregnated paper backing prepared in the above-mentioned step not containing vinylon short fiber to form an adhesive layer having a film thickness of 30 ⁇ m.
• a polyvinylacetate emulsion was applied to the surface of the second paper layer of the acrylic resin-impregnated paper backing (containing vinylon short fiber) at a covering amount of 3 g/m and dried. Long-chain alkyl acrylic resin was then applied on top of the above-mentioned polyvinylaylacetate emulsion at a covering amount of
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not be distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Comparative Example 2-1.
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not be distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Comparative Example 2-1.
• Interlayer strength 200 200 210 220 235 200 200 200 210 230 (gf/15 mm)
• Example 5 the degree to which the impregnated amount of water- dispersed impregnant affects the strength and so forth of the resulting tape was evaluated in the manufacturing of adhesive tape. Furthermore, for the sake of convenience in conducting evaluation testing in the present example, a single-layer paper backing was used instead of a paper backing having a double-layer combined structure. Namely, 10% by weight of vinylon (commercially available from Kurare) was mixed with 'beaten wood pulp to prepare a pulp gruel after which the pulp gruel was formed into paper having a
• an impregnant in the form of styrene butadiene rubber was impregnated throughout the resulting paper backing under the condition that the impregnated amount of solid portion was 0.5, 1, 5, 15, 30 and 45 g/m 2 as described in Table 2 below using the immersion method.
• the tensile strength in the vertical direction, elongation and the tearing strength in the horizontal and vertical directions of the rubber- impregnated paper backing obtained in this manner were measured according to the procedures described in the above-mentioned Example 1.
• the measurement results described in Table 2 below were obtained, moreover, a slivering test was performed according to the evaluation of slivering resistance described in the above-mentioned Example 1.
• the presence or absence of tape slivering when the adhesive tape was peeled from an aluminum panel were evaluated by ranking as either "good” or "defective.”
• the evaluation results described in Table 2 below were obtained.
• Example II The procedure described in the above-mentioned Example I was repeated except as follows.
• mean blending ratio mean of the blending ratio of the first paper layer and the blending ratio of the second paper layer
• the blending ratio of vinylon short fiber in the first paper layer was decreased from 20% by weight to 10% by weight to make the mean blending ratio 5% by weight as shown in Table 3.
• the first paper layer and second paper layer were combined into a single unit to an extent to which the interfaces of the two layers could not he distinguished by a papermaking method using a multi-layer former to prepare a paper backing having the appearance of Japanese paper and a basis weight of 40 g/m 2 .
• an acrylic resin-impregnated paper backing and adhesive tape were obtained that were similar to those obtained in the above-mentioned Example 1.
• Example 6 Example 1 Comp. Ex. Comp. Ex.
• the adhesive sheet when used as the backing of an adhesive sheet in particular, can be adhered to the covered object without being accompanied by lifting, and the adhesive sheet can be torn and cut without impairment of hand-tearability when tearing along a masking region, thereby allowing the achieving of good line following effects and masking effects.
• the adhesive sheet after the adhesive sheet has been used, the adhesive sheet can be cleanly and easily peeled without being accompanied by slivering or breaking of the sheet, thereby providing a good paper backing.
• a paper backing and adhesive sheet are therefore provided that can be advantageously used in the manufacturing of adhesive tape used for the purpose of masking.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)
• Adhesive Tapes (AREA)
• Adhesives Or Adhesive Processes (AREA)

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Family Applications (1)

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• 1998
  • 1998-05-01 JP JP12214598A patent/JP4149559B2/ja not_active Expired - Lifetime
• 1999
  • 1999-04-16 CN CNB99805660XA patent/CN1202310C/zh not_active Expired - Lifetime
  • 1999-04-16 KR KR1020007011971A patent/KR100582046B1/ko not_active IP Right Cessation
  • 1999-04-16 WO PCT/US1999/008416 patent/WO1999057372A1/en active IP Right Grant
  • 1999-04-16 DE DE19983171T patent/DE19983171B4/de not_active Expired - Lifetime

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