JPH0466273B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention can easily peel off pressure-sensitive adhesive tapes (pressure-sensitive adhesive tapes) typified by price tags, identification tags, etc. affixed to various products such as ceramics, metals, plastics, and paper. Relating to a release agent for. [Prior Art] Pressure-sensitive adhesive tapes can be easily attached to various materials without the need for gluing or the like, and are therefore widely used for various labels. An example of this is the price tags attached to various products at supermarkets.When it becomes necessary to remove the price tags, for example, when the price is changed, when the product is given as a gift, or when the purchaser removes it before actually using it. In the case of paper products, it is difficult to remove the adhesive because it cannot be easily removed and the paper supporting material remains behind, and in the case of paper products, it stains the product itself. There is a strong need to easily and cleanly remove adhesives once applied, and this is evident from the fact that various peeling solutions are commercially available. Commercially available products include Hagashitsuko, which is manufactured and sold by Maruzen as a stamp removal liquid, and Hagaron (generally available), which is marketed as a product that removes stamps, stamps, paper labels, chewing gum, tapes, stickers, wax pens, etc. Formerly, Taiei Kogyo Co., Ltd.)
Watupen/sticker peeler (manufactured by Cemedine Tsusho Co., Ltd.) for watzpen, stickers, cellophane tape, packing tape, bond adhesive removal liquid for kitchen tape, gap tape, carpet tape, adhesive hooks, etc. (manufactured by Gisuke Konishi)
etc. can be given. [Problems to be Solved by the Invention] However, among these peeling liquids, those intended for stamps and stamps are composed of a surfactant aqueous solution, and the pressure-sensitive adhesive tape targeted by the present inventors It had almost no effect on peeling it off. In addition, many adhesive tapes such as cellophane tape use ethyl acetate or chlorinated solvents, and although the purpose of making them easy to remove when the product to which they are applied is plastic, etc., has been achieved, Other drawbacks included that the product was attacked by solvents. [Means for Solving the Problems] In view of the above circumstances, the present invention seeks to provide a means for easily and cleanly peeling off the pressure-sensitive adhesive tape once applied, as needed, without staining the product. As a result of intensive research, we found that a specific organic solvent mixture and its solubility parameter (hereinafter referred to as SP
Abbreviated as value. ) can be easily and quickly removed by using an organic solvent mixture with a specific value as a release agent, and even if the product is easily eroded, such as plastic, it will not damage the product. found that there was no
Based on this knowledge, we have completed the present invention. That is, the present invention provides a pressure-sensitive material comprising a lower alcohol having 2 to 4 carbon atoms and a paraffinic solvent having 6 to 10 carbon atoms and/or cyclohexane, the solubility parameter of which is in the range of 8.0 to 10.0. The present invention provides a release agent for adhesive tapes. Hereinafter, the configuration of the present invention will be explained in detail. The lower alcohol used in the present invention has 2 to 2 carbon atoms.
As long as it falls within the range of 4, either linear or branched chain forms can be used. Examples include ethanol, n-propanol, iso-propanol, n
-butanol, iso-butanol, tert-butanol, etc., but ethanol, n-propanol, and n-butanol are particularly preferred. The paraffinic solvent used in the present invention has 6 or more carbon atoms.
10, either linear or branched chain may be used, but n-hexane, n-heptane, n-octane, and n-nonane are particularly preferred. The cyclohexane used in the present invention is used together with the above paraffinic solvent or as a substitute for the paraffinic solvent. In carrying out the present invention, one or two of these paraffinic solvents and cyclohexane are arbitrarily selected and used. In producing the release agent for pressure-sensitive adhesive tapes of the present invention, the blending ratio of lower alcohol and one or more selected from the group consisting of paraffinic solvents and cyclohexane is determined to have a PC value of 8.0 to 8.0 after mixing.
Limited by 10.0. For example, in the case of ethanol and n-hexane, the volume ratio is 6.4:93.6.
~31.4:68.6 and 7.1:92.9 to 47.6:52.4 in the case of isopropanol and n-heptane.
The SP value of each solvent is from KLHoy, Journal of
Using the values in Paint Technology, 42 , 76, (1970), the SP value after mixing is calculated using the following formula (Paint Handbook, p. 324).
Calculated using Nikkan Kogyo Shimbun, edited by Juku Matsumoto). _{δtotal =} δ _{1 X 1 + δ 2} fragrance,
A co-solvent and the like can be added within a range that does not impair the effects of the present invention. In particular, it is preferable to use a ketone solvent such as acetone, methyl ethyl ketone, 2-pentanone, or 2-heptanone as a co-solvent because it increases the peeling effect, but increasing the amount of ketone will attack styrene, printing, etc. must be 20% or less, 15% or less for methyl ethyl ketone, and 5% or less for 2-pentanone and 2-heptanone. The release agent of the present invention weakens the adhesive strength of the pressure-sensitive adhesive tape by wetting it with the release agent, making it easier to peel off. The method of using the release agent of the present invention varies depending on the type of pressure-sensitive adhesive tape to be used, but if the support of the adhesive tape is a material that is easily penetrated by the release agent solution, such as paper or cloth, The adhesive tape may be applied directly onto the support, and if the object to which the adhesive tape is attached is paper or cloth, the opposite method may be used. In the case of cellophane tape, vinyl tape, etc. that cannot be penetrated by solvents, it is preferable to peel off the edge of the tape a little, pour the release agent little by little from there, and then gently peel it off. The release agent of the present invention may be filled in any type of container as long as the release agent solution can be taken out, but it is preferable to fill it in a felt-tip pen type container because of the convenience of direct application. [Example] Next, the present invention will be explained in more detail by giving examples. Examples 1 to 15, Comparative Examples 1 to 8 A commercially available pressure-sensitive adhesive tape (made of paper) was attached to a polyethylene terephthalate (PET) film for 1 kg/
After applying a pressure of ^cm2 , leave it at room temperature for one day. Next, various release agents listed in Tables 1 and 2 are applied onto the support to the extent that the support is uniformly wetted, and the PET
The 90 degree peel strength between the film and the pressure sensitive adhesive tape was measured. The measuring device used was Tensilon UTM-4 (manufactured by Toyo Keikokuki), and the measurement conditions were room temperature and tensile speed.
50mm/min. The results are shown in Tables 1 and 2.

【table】

[Table] As shown in Tables 1 and 2, single solvents with SP values in the same range as the SP value of the stripping agent of the present invention, such as acetone, trichloroethylene, benzene, and ethyl acetate, attack styrene, printing, etc. It cannot be used for the intended purpose, and the peeling effect is not sufficient with acetone and ethyl acetate. In contrast, the release agent according to the present invention has a peel strength of
It weighs 120 g or less, allows pressure-sensitive adhesive tape to be easily peeled off, does not attack styrene, printing, etc., and is less toxic to the human body. Examples 16 to 23 Table 3 shows examples in which a ketone solvent was used as a co-solvent.

【table】

Claims (1)

[Claims] 1. A lower alcohol having 2 to 4 carbon atoms and 6 carbon atoms.
~10 paraffinic solvents and/or cyclohexane with a solubility parameter of 8.0
A release agent for pressure-sensitive adhesive tape, characterized in that the release agent is in the range of ~10.0. 2. The release agent for pressure-sensitive adhesive tapes according to claim 1, wherein the paraffin solvent is n-hexane, n-heptane, n-octane, or n-nonane.