JP3427199B2 - Double-sided release film - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided release film, and more particularly to a double-sided release film for a base of a correction tape used for correcting a document. Things. 2. Description of the Related Art In the field of office supplies, correction liquids and glues have conventionally been used for correcting documents.
Since each of them is a solution or paste-like product, there are inconveniences such as attachment or gluing to a portion that does not need to be corrected at the time of use. Recently, various types of correction tapes having a white pigment layer have been proposed to solve the above-mentioned problems (for example, see Patent Documents 1 to 3). The above-described correction tape is used by transferring a tape-like white pigment layer to a portion where correction is required, has an advantage that drying time is unnecessary, and that only a target position can be corrected. [Patent Document 1] Japanese Patent Application Laid-Open No. 4-131297 [Patent Document 2] Japanese Patent Application Laid-Open No. 5-134378 [Patent Document 3] Japanese Patent Application Laid-Open No. 6-127774 As the base of the tape for use, paper having a release layer on both sides is mainly used, but it is difficult to reduce the size of such a base because the thickness is limited. Therefore, the use of a synthetic resin film instead of the above-mentioned paper is conceivable, but when the release force of the release layers provided on both sides is not an appropriate value,
In an actual use situation, there is a problem that the correction tape is not smoothly pulled out from the wound correction tape. [0006] That is, if the peeling force at the time of pulling out the correction tape is too weak (too light), there is a disadvantage that the white pigment layer easily falls off the substrate, and conversely, the peeling force is too strong (heavy and light). Excessive) results in poor peeling of the white pigment layer. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a double-sided release film for a base of a correction tape used for correcting a document. It is in. [0008] That is, the gist of the present invention is to provide a polyester film having a thickness of 5 to 25 µm, on both sides (A) and (B) of a mold mainly composed of a curable silicone resin. A double-sided release film for a base of a correction tape used by forming a white pigment layer on the heavy release surface (B), wherein the release film (B) is provided with the layer, and the following formulas (1) and (2) are simultaneously satisfied. And a double-sided release film for a substrate of a correction tape. 2 ≦ FB / FA ≦ 6 (1) 5 ≦ FA + FB ≦ 70 (2) In the above formula, FA is the peeling force on the A side (gf / 50 mm width). And FB represent the peeling force (gf / 50 mm width) on the surface B side. Hereinafter, the present invention will be described in detail.
In the present invention, a polyester film is used as the film. Such a polyester is produced by polycondensing an aromatic dicarboxylic acid or an ester thereof with a glycol. Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, and the like.As the glycol, ethylene glycol,
Examples thereof include diethylene glycol, 1,4-butanediol, neopentyl glycol, and 1,4-cyclohexanedimethanol. The above polyester can be produced according to a conventionally known method. For example, a transesterification reaction is performed between a lower alkyl ester of an aromatic dicarboxylic acid and a glycol, or a bisglycol ester of an aromatic dicarboxylic acid or substantially a direct esterification of an aromatic dicarboxylic acid and a glycol or After forming the low polymer, a method of performing polycondensation at a temperature of 240 ° C. or more under reduced pressure can be adopted. At this time, ordinary catalysts, stabilizers, various additives and the like can be optionally used. Representative examples of the above polyester include poly (ethylene terephthalate), poly (ethylene naphthalate), poly (1,4-cyclohexylene dimethylene terephthalate) and the like. The polyester used in the present invention may be a homopolymer, a copolymer obtained by copolymerizing a small amount of a third component, or a blend of two or more polyesters. The polyester film is obtained by melt-extrusion of the above-mentioned polyester according to a known method and then stretching the polyester film, and has a thickness of 5 to 25 μm. In addition, polyester film has various stabilizers, ultraviolet absorbers, lubricants,
Pigments, antioxidants, plasticizers and the like may be added. In the present invention, the release layer is a release layer containing a curable silicone resin as a main component. As the curable silicone resin, any type such as a solvent addition type, a solvent condensation type, a solvent ultraviolet curing type, a solventless addition type, a solventless condensation type, a solventless ultraviolet curing type, and a solventless electron beam curing type may be used. Is also good. [0015] Solvent-added silicone resins include, for example,
By using a platinum catalyst, a polydimethylsiloxane with a vinyl group introduced at the end is crosslinked to form a coating film, and a solvent condensation type silicone resin is used in combination with a silanol group in a base polymer and a crosslinking agent in the presence of an organotin catalyst. A polycondensation reaction takes place with the functional group to form a coating film. Solvent UV-curable silicone resins include those which are photo-cured by using an acrylic functional group in a normal silicone rubber, those which crosslink after cleavage of an epoxy group by generating a strong acid by decomposition of an onium salt with ultraviolet rays, Examples include a type of crosslinking by addition reaction of thiol to vinyl siloxane. The solventless addition-type silicone resins, those utilizing the polymerization reaction of the alkenyl groups bonded to Si atoms, many of them by an addition reaction between Si-CH = CH ₂ and H-Si. In a solventless UV-curable silicone resin, curing proceeds by the same reaction as in a solvent UV-curable silicone resin. However, unlike the solvent type,
Since the molecular weight is kept low and the viscosity is reduced, the reactivity is extremely high. Specific examples of the curable silicone resin include:
Products KS-774 and KS-77 manufactured by Shin-Etsu Chemical Co., Ltd.
5, KS-778, KS-779H, KS-856, X
-62-2422, X-62-2461, KNS-30
5, KNS-3000, X-62-1256, product DKQ3-202, D manufactured by Dow Corning Asia Co., Ltd.
KQ3-203, DKQ3-204, DKQ3-20
5, DKQ3-210, products YSR-3022, TPR-6700, TPR-672 manufactured by Toshiba Silicone Co., Ltd.
0, TPR-6721 and the like. Various combinations of the curable silicone resin on both sides of the film, such as addition types, condensation types, ultraviolet curing types, and additional / ultraviolet curing types, can be considered. In addition, depending on the product requirements,
When considering the peeling stability over time, a combination of condensation types is preferable. In the present invention, as a method of forming a release layer by applying a release agent to both surfaces of a film, a bar coat, a reverse roll coat, a gravure coat, a rod coat, an air doctor coat, a doctor blade coat, etc. A conventionally known coating method can be adopted. The thickness of the release layer is preferably from 0.01 to 5 μm from the viewpoint of coating properties on the roughened surface of the film. When the thickness of the release layer is 0.01 μm, it is difficult to obtain a uniform coating film lacking in stability from the viewpoint of coatability,
Conversely, if it exceeds 5 μm, it is too thick, which is not preferable in practical use. The double-sided release film of the present invention is used as a substrate of a correction tape. In the present invention, the peeling force (gf / 50 mm width) FA on the A side (light peeling side) and the B side ( It is important that the peeling force (gf / 50 mm width) FB of the heavy peeling surface) satisfies the following expressions (1) and (2) simultaneously. 2 ≦ FB / FA ≦ 6 (1) 5 ≦ FA + FB ≦ 70 (2) Equation (1) is obtained by comparing the A-plane side and the B-plane side. Formula (2) defines the peel force level for both sides. In the formula (1), a preferable peeling force ratio of the heavy release surface (B) to the light release surface (A) is 3 to 5. When the peeling force ratio is less than 2, the peeling force becomes extremely light. As a result, when a white pigment layer is formed on the surface of the release film of the present invention as a substrate to form a correction tape, the white pigment layer It easily falls off from the base material, and inconveniences such as winding deviation occur during processing. On the other hand, if the peeling force ratio exceeds 6, the peeling force on the heavy peeling surface side becomes too heavy, and as a result, poor peeling of the white pigment layer occurs. Then, further, in the formula (2), the total of the peeling forces on both sides is specified so as not to exceed 5 to 70 (gf / 50 mm), and the peeling force level of the light peeling surface and the heavy peeling surface is set within a certain range. It needs to be suppressed. When the double-sided release film of the present invention is used as a base of a correction tape, a white pigment layer for the correction tape is composed of a white pigment, a binder, an additive and the like. Examples of the white pigment include titanium oxide, zinc oxide, calcium carbonate, barium carbonate and the like, and these are used as one kind or as a mixture of two or more kinds. On the other hand, typical examples of the binder include cellulosic resins, specifically, ethyl cellulose and the like. Examples of the additive include a dispersant and a plasticizer, and the additive is an optional component. The white pigment layer is formed by preparing a correction ink containing the above-described components, applying the correction ink to the heavy release surface (B) of the double-sided release film of the present invention, and then drying. The thickness of the white pigment layer (the thickness after drying) is usually within 1.2 times the thickness of the substrate. EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples unless it exceeds the gist. In the Examples and Comparative Examples, “parts” indicates “parts by weight” as solid content. The evaluation method used in the present invention is as follows. (1) Evaluation of peelability: One side of a double-sided pressure-sensitive adhesive tape (“No. 502” manufactured by Nitto Denko Corporation) was adhered to the silicone layer of the measurement sample, and 50 mm × 3
After cutting to 00 mm, the peel force after leaving for 1 hour is measured. The peeling force was measured using a tensile tester ("Intesco Model 2001" manufactured by Intesco Corporation) at a tensile speed of 300.
mm / min. Was performed under the following conditions. (2) Evaluation of the correction tape: The evaluation was made by evaluating the releasability when the correction tape was pulled out. That is, a white pigment layer was formed on the heavy release surface of the double-sided silicone-coated release film, and a wound correction tape portion was created.
The peeling state (feeling of use) when the correction tape was pulled out was evaluated on the following three levels. The thickness of the white pigment layer was the same as that of the double-sided silicone-coated release film. １: The correction tape can be pulled out smoothly and with an appropriate peeling property. Δ: The feeling of use when pulling out the correction tape is slightly heavy (peeling force is strong). ×: The feeling of use when pulling out the correction tape is considerably heavy (peeling force is too strong) or the feeling of use is considerably light (peeling force is too weak). Example 1 A release agent having the following composition was applied to both sides (A) and (B) of a polyester film (25 μm) so that the thickness after drying was 0.1 g / m ^2. A mold film was obtained. The characteristics of this film are as shown in Table 2. Note that the combination of the release agents with the reaction type was a solvent addition type. The composition of the release agent on the surface (A) side is 100 curable silicone resin (“KS-779H” manufactured by Shin-Etsu Chemical).
Part, curing agent (Shin-Etsu Chemical "CAT-PL-8") 1 part,
700 parts of methyl ethyl ketone (MEK), toluene 80
0 parts and 700 parts of n-heptane, and the composition of the release agent on the surface (B) side is a curable silicone resin (“KS” manufactured by Shin-Etsu Chemical Co., Ltd.).
-847H ") 100 parts, curing agent (" CAT "manufactured by Shin-Etsu Chemical Co., Ltd.)
-PL-50T "), 10 parts of a release control agent (" KS-3800 "manufactured by Shin-Etsu Chemical Co., Ltd.), and the same solvent amounts as described above. Example 2 A double-sided release film was obtained in the same manner as in Example 1 except that the types of the release agent and the curing agent on each side were changed. The characteristics of this film are as shown in Table 2. The combination according to the reaction type of the release agent in this example is a solvent addition type / solvent UV curing type, and a curable silicone resin (“X-62-5040 manufactured by Shin-Etsu Chemical Co., Ltd.”) is provided on the surface (A) side.
A ") and 100 parts of a curing agent (" PL-50 "manufactured by Shin-Etsu Chemical Co., Ltd.)
00)), 100 parts of a curable silicone resin (“KS-847H” manufactured by Shin-Etsu Chemical Co., Ltd.) was used on the surface (B) side.
1 part of curing agent (“PL-50T” manufactured by Shin-Etsu Chemical) and 50 parts of release control agent (“KS-3800” manufactured by Shin-Etsu Chemical)
Parts were used. The amounts of MEK, toluene and n-heptane used are the same as in Example 1 (the same applies hereinafter). Example 3 A release film was obtained in the same manner as in Example 1 except that the types of the release agent and the curing agent on each side were changed. The characteristics of this film are as shown in Table 2.
The combination of the release agent of the present example by the reaction type is a solvent condensation type, and a curable silicone resin (“FSXK-256 made by Dow Corning Asia Ltd.”) is provided on the surface (A) side.
0 ") and 1 part of a curing agent (" FSK-3031 "manufactured by Dow Corning Asia) are used, and a curable silicone resin (KS-723 manufactured by Shin-Etsu Chemical Co., Ltd.) is used on the surface (B) side.
A) 100 parts and 10 parts of a curable silicone resin (KS-723B manufactured by Shin-Etsu Chemical), a curing agent (“P” manufactured by Shin-Etsu Chemical)
S-3 ") 5 parts were used. Comparative Example 1 A release film was obtained in the same manner as in Example 1, except that the types of the release agent and the curing agent were changed and the release agent was applied to only one side of the film. . The characteristics of this film are as shown in Table 2. The composition of the release agent is a curable silicone resin (“X-62-5040” manufactured by Shin-Etsu Chemical Co., Ltd.).
A ") 100 parts, curing agent (" PL-500 "manufactured by Shin-Etsu Chemical Co., Ltd.)
0 ") 5 parts. Comparative Example 2 A release film was obtained in the same manner as in Example 1, except that the types of the release agent and the curing agent on each side were changed. The characteristics of this film are as shown in Table 2.
The combination of the release agent of the present example by the reaction type is a solvent condensation type, and a curable silicone resin (“FSXK-256 made by Dow Corning Asia Ltd.”) is provided on the surface (A) side.
0 ") and 100 parts of a curing agent (" FSK-1638 "manufactured by Dow Corning Asia) are used, and a curable silicone resin (" KS-723 "manufactured by Shin-Etsu Chemical Co., Ltd.) is used on the surface (B) side.
A ") 100 parts, curable silicone resin (" KS-723B "manufactured by Shin-Etsu Chemical) 5 parts, curing agent (" PS "manufactured by Shin-Etsu Chemical)
-3 ") 5 parts were used. Comparative Example 3 A release film was obtained in the same manner as in Example 1 except that the thickness of the film was changed to 25 μm and the types of the release agent and the curing agent on each side were changed. Was. The characteristics of this film are as shown in Table 2. The combination according to the reaction type of the release agent of this example is a UV curing type,
On the side of the surface (A), 100 parts of a curable silicone resin (“X-62-5040A” manufactured by Shin-Etsu Chemical) and 5 parts of a curing agent (“PL-5000” manufactured by Shin-Etsu Chemical) are used. Include a curable silicone resin (“X-62-5” manufactured by Shin-Etsu Chemical Co., Ltd.)
039A "), 100 parts of a curing agent (" X-62 "manufactured by Shin-Etsu Chemical Co., Ltd.)
-5039B "). Comparative Example 4 A release film was obtained in the same manner as in Example 1 except that the thickness of the film was changed to 25 μm and the types of the release agent and the curing agent on each surface were changed. Was. Table 2 shows the characteristics of this film. The combination of the release agents in the reaction type of this example is a UV-curable type, and the surface (A) is provided with a curable silicone resin (“X-62-5” manufactured by Shin-Etsu Chemical Co., Ltd.).
040A "), 100 parts, curing agent (" PL-5 "manufactured by Shin-Etsu Chemical Co., Ltd.)
000 ”), 5 parts, release control agent (“ K
S-3800 "), and a curable silicone resin (" X-62-5039 "manufactured by Shin-Etsu Chemical Co., Ltd.) is used on the surface (B) side.
A "), a curing agent (" X-62-50 "manufactured by Shin-Etsu Chemical Co., Ltd.)
39B "), 5 parts, release control agent (" K "manufactured by Shin-Etsu Chemical Co., Ltd.)
S-3800 ") 50 parts were used. [Table 2] According to the present invention described above, a double-sided release film for a base of a correction tape used for correcting a document is provided, and the present invention greatly contributes to the field of office supplies.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshihide Ozaki 347 Inoguchi, Yamato-cho, Sakata-gun, Shiga Pref. −134378 (JP, A) Japanese Utility Model Application Hei 5-22537 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 C09J 7/02

Claims (1)

(57) [Claim 1] A polyester film having a thickness of 5 to 25 μm is provided on both sides (A) and (B) with a release layer containing a curable silicone resin as a main component, A double-sided release film for a substrate of a correction tape used by forming a white pigment layer on a heavy release surface (B), wherein the correction tape satisfies the following formulas (1) and (2) simultaneously: Double-sided release film for substrates. 2 ≦ FB / FA ≦ 6 (1) 5 ≦ FA + FB ≦ 70 (2) In the above formula, FA is the peeling force (gf / 50 mm width) on the A side, and FB is Indicates the peeling force (gf / 50 mm width) on the B side.