JPS61152785A - Releasable treatment - Google Patents

Abstract

PURPOSE:The titled treatment suitable as a novel releasant, capable of controlling releasability and forming a treated layer having printability, consisting of a reaction product of an ethylene-acrylic acid copolymer resin and a long- chain alkyl isocyanate. CONSTITUTION:The aimed treatment consisting of a reaction product of (A) 100pts.wt. ethylene-acrylic acid copolymer resin (preferably 3-20wt% acrylic acid content and 1-3,000g/10min melt index) and (B) 5-50pts.wt., preferably 10-30pts.wt. long-chain alkyl isocyanate (e.g., hexadecyl isocyanate, etc.).

Description

Detailed Description of the Invention [Field of Application] The present invention consists of a reaction product of ethylene-acrylic, /L/acid copolymer resin and long-chain alkyl isocyanate, and has controllable peelability and printability. The present invention relates to a new releasable treatment agent that can form a treatment layer and is suitable as a release agent.

[Conventional technology]

Release paper is used to protect or preserve the adhesive surface of adhesive tapes, adhesive tapes, etc. This release paper is generally made of a base material made of glassine paper, kraft paper, or a polyethylene film laminated on one or both sides thereof, with a layer made of a release agent or a release treatment agent to impart releasability. It's getting worse.

By the way, the release paper has enough adhesion strength to the base material to prevent the releasable treated layer from easily falling off the base material due to mechanical impact force, etc., and on the other hand, when the release paper is peeled off, there is a need to prevent the transfer of adhesive, etc. Therefore, removability to the extent that it can be easily peeled off is required.

Hitherto, as a release treatment agent for forming the release paper, a silicone-based emulsion treatment agent has been known.

[Problems to be solved]

However, there is a problem in that the conventional y-licon release treatment agent does not have satisfactory adhesive strength to a polyethylene base material laminated with a polyethylene film. That is, when this was applied to the polyethylene film surface of a polyethylene base material, there was a problem in that the adhesive strength was poor and the releasable treated layer easily fell off from the base material due to mechanical impact force. . When a product from which the treated layer has fallen off is attached to an adhesive or the like, problems such as inability to peel occur occur. In addition, the adhesion strength to adhesives such as adhesives is not sufficient, and when release paper using this is applied to labels etc., there are problems such as the package crumbling during transportation and peeling during post-processing. was.

On the other hand, FIJ cones have poor printability, so the releasable treatment layer also has the problem of not being able to write on them using ballpoint pens, pencils, magic inks (water-based, oil-based), etc. Ta.

(Means for Solving the Problems) The present inventors have overcome the problems described below, and have achieved satisfactory adhesion to polyethylene base materials with a good balance of peelability and printability. As a result of intensive research to develop a stripping treatment agent that has the same properties, it was discovered that this objective could be achieved using a reaction product between an ethylene-acrylic acid copolymer resin and a long-chain alkyl isoV anate. , the present invention was accomplished.

That is, the present invention provides an ethylene-acrylic acid copolymer resin and an ethylene-acrylic acid copolymer resin of 5 to 50% per 100 parts by weight of the ethylene-acrylic acid copolymer resin! A stripping treatment agent consisting of a reaction product with a certain amount of long-chain alkyisoV anate is provided.

In the present invention, the ethylene-acrylic acid copolymer resin has a copolymerization rate of ac+3 A/acid, that is, an implication of 8 to 2.
0 heavy, melt index credit ~8000, f/
10 minutes, among which the content is 5 to 18% by weight and the melt index is 5 to 2500 JF/10 minutes is preferably used. A specific example is “Delimakoyl”.
820J, ``Delimacor'' 1480J, ``Primacor/I1598oJ'', 11 to 45cm (both trade names; Dow Chemical Company a) can be obtained.

On the other hand, representative examples of long-chain alkyl isocyanates include hexade Vμ in V anate, heptadecyl isocyanate, ophtade VA/iso V anate, nonade V/l/isocyanate, and the like.

According to the present invention, the long-chain acrylic isocyanate is 5 to 5 parts per 100 parts by weight of the ethylene-acrylic acid copolymer resin.
0 parts by weight, preferably 10 to 80 parts by weight. In the present invention, this long-chain alkyl isocyanate is mainly used as a releasability-imparting agent and a printability-imparting agent for the ethyl V-acrylic acid copolymer resin, which is mainly used as an adhesion-imparting agent for polyethylene base materials. Therefore, if the blending ratio is less than 5 parts by weight, the adhesion will be too strong and the releasability will not be sufficiently developed, whereas if it exceeds 50 parts by weight, the releasability will be too good, especially for adhesion to polyethylene base materials. This is not desirable because the force is insufficient.

The releasable treatment agent of the present invention is applied to a base material such as a polyethylene base material as a reaction product of an ethylene-acrylic acid copolymer resin and a long-chain alkyisoV anate. That is, for example, it is applied to the base material as a reaction product formed by heating and melting an ethylene-acrylic acid copolymer resin and adding a long-chain oxyincyanate thereto.

(Effects of the Invention) According to the present invention, since the ethylene-acrylic acid copolymer resin and the long-chain alkyl isocyanate are used in combination, the adhesive strength (castability) and releasability are improved even to polyethylene base materials. Therefore, release paper or adhesive tape made of a polyethylene base material that prevents the release treatment layer from falling off from the base material in actual use can be easily performed. etc. can be obtained.

By changing the blending ratio of t'fi-1, the balance between adhesive strength and releasability can be controlled, and releasability treatment can be performed in accordance with the properties of the base material or adhesive.

Furthermore, the treatment layer formed with the releasable treatment agent of the present invention is
It has printing properties that allow it to be written on with various writing instruments such as pens, magic ink, and pencils.

In addition, the releasable treatment layer has excellent adhesion and releasability as well as puffiness, which prevents labels, adhesive tapes, etc. made with this treatment agent from collapsing during transportation, making it easier to use during post-processing. Problems such as peeling in etc. are also effectively prevented.

〔Example〕

Example 1 Ethylene-acrylic acid copolymer resin (Delimacor tv 1
820 p (manufactured by Dow Chemical Company) was heated and melted (170°C)
Add 5 I of octadecyl isocyanate to 100.9 kg of Sake Marumono and let it react, and apply the resulting reaction liquid to the polyethylene film side of kraft paper laminated with polyethylene film so that the solid content becomes 0.8 jl/m'! A release paper was prepared by washing and drying.

Next, the resulting release paper was examined for release strength, adhesive strength, shedding property, and printability. The evaluation was performed using the following method.

(Peeling force) After attaching the release paper to a polyester adhesive tape (r'h81B; Nitto Denki Kogyo IK) by making one reciprocation of 2kliOTX-F, the release paper was heated at 70°C for 24 hours, then the release paper was pulled at 20°C. The film was peeled off using a Tensilon tensile tester (manufactured by Shimadzu Corporation) at a speed of 80 Gam/min, and the peeling force at that time was examined.

(Adhesive strength) The test was carried out in the same manner as in the case of peel strength, except that the adhesive was heated at 70° C. for 24 hours and then left as is for 80 minutes.

(Removal property) After applying a load of C2Q & 4 on the releasable surface of the release paper and reciprocating it 10 times, it was removed, and then the polyester adhesive tape-81B was affixed to that surface and its peeling force was examined. , the case where the peeling force increased was evaluated as x, and the other cases were evaluated as O.

(Printability) Characters were written on the releasable treated surface with an oil-based or water-based ballpoint pen, and the clarity was visually judged.If the characters were sufficiently legible, they were evaluated as O1, which was impossible to read, or if it was slightly insufficient, which was rated as ×. The results are shown in the table.

Example 2 Ethylene-acrylic acid copolymer fil (Nat S 6
To 100 g of Dow Chemical Co. yR) heated and melted (160°C), Octade VA/Iso V ane) 2
A release treatment agent was prepared according to Example IK except that 9II was used, release paper was produced, and an evaluation test was conducted. The results are shown in the table.

Example 3 A release treatment agent was prepared according to Example 1 except that 6 g of Octade V1%/Iso V Anne (6 g) was used, and a release paper was prepared and an evaluation test was conducted.9 The results are shown in the table. .

Example 4 Ethylene-acrylic acid copolymer tree Jli (f 13-r
:l w/L/1480; Dow Chemical Company II) was heated and melted (160°C) 1009, and 80 g of heptadene isoquanate was added and reacted, and the resulting reaction solution was laminated with a polyethylene film. The coating amount was 1.0. lil
/rn' by an extrusion coating method to prepare a release paper.

The results of evaluation tests for this release paper are shown in the table.

Example 5 Ethylene-acrylic acid copolymer tree 1lW (Primaco-A'
6980 z Dow Chemical Company 11) 100g, off l
f ￥ # y y 7 Net 30g, application amount 1.2
A releasable treatment agent and a release paper were obtained according to Example 4, except that the exfoliating agent was changed to "p/m", and an evaluation test was conducted. The results are shown in the table.

Comparative Example 1 A release treatment agent obtained by adding a platinum-based catalyst to silicone emulsion μ resin (Ks-772; (Etsu Kagaku Co., Ltd.: added mvu cone) was applied to the polyethylene film surface of polyethylene film laminated kraft paper. 0.8.9/r
A release paper having a treated layer corresponding to rl' was obtained. The evaluation results of this release paper are shown in the table.

Comparative Example 2 V 13 : i-en Z W /l/jin (S Y
L -OF F 22: A release treatment agent obtained by adding an organotin compound catalyst to shrink mold silicone (manufactured by Toray Silicone Co., Ltd.) was applied to form a treatment layer of Q, 5,9/rn''. A release paper was obtained in accordance with Comparative Example 1, and an evaluation test was conducted on it.The results are shown in the table.

As a matter of fact, the release papers of Examples 1 to 5 are of a type with slightly heavy release properties, that is, heavy release type release papers, and therefore have high adhesion and good release properties and lance. It can be seen that it is possible to control the peeling force, and that it has excellent drop-off prevention properties and printing properties.

Claims (1)

[Scope of Claims] 1. A stripping treatment agent comprising a reaction product of an ethylene-acrylic acid copolymer resin and 5 to 50 parts by weight of long-chain alkyl isocyanate per 100 parts by weight of the ethylene-acrylic acid copolymer resin. . 2. The ethylene-acrylic acid copolymer resin has an acrylic acid content of 3-20% by weight and a melt index of 1-3000g.
/10 minutes.