JPH03217480A - Anti-adhesive - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an anti-adhesive agent, and more particularly, an anti-adhesive agent that imparts easy-opening properties to the opening (heat-sealed portion) of, for example, liquid paper containers for beverages. Regarding drugs.

[Conventional technology and problems]

In milk cartons and other liquid paper containers for beverages such as juice, which use polyethylene laminated non-uniform paper, after the carton is formed, the liquid content is filled from the filling opening at the top, and then the filling opening is heat-sealed. It is made into a product.

Meanwhile, the consumer peels off the heat-sealed portion of the opening and uses the filling port as a pouring spout. In that case, if the heat-sealed part is bonded more tightly than necessary, it will not be easy to open the opening, and the opening will not be peeled off cleanly, resulting in damage or hangnails, which will be unsightly, and will not be suitable for use as a pouring spout. There are also problems such as spillage from damaged parts or accumulation in hangnails, which is unsanitary. In order to solve these problems, an anti-adhesive agent, which can also be called a heat-seal adhesion control agent, is used in the heat-sealed part. Anti-adhesive agents include silicone resin, polyethylene wax, soybean lecithin, mold release agents such as higher fatty acid amide, and base polymers include ethyl cellulose, cyclized rubber,
Ethyl acetate and toluene are recognized as solvents, and appropriate combinations of these raw materials are used. but,
The anti-adhesive agents currently in use are not synthesized for anti-adhesive purposes, and the control of adhesive strength is largely dependent on the combination of the release agents and the coating amount.

However, when controlling the coating amount, a sufficient amount is coated to maintain sealing strength with safety in mind, so it is difficult to obtain the original anti-adhesive effect.

On the other hand, if the amount of coating is reduced by focusing on ease of opening, the seal strength will decrease, causing seal failure and causing serious problems such as leakage of contents. [Means for Solving the Problems] In view of the above circumstances, the present inventors completed the present invention as a result of intensive research to solve the above problems.

That is, the present invention includes an anti-adhesive agent made by reacting an organosilicon compound having at least one hydrogen group with a hydrocarbon compound having at least one double bond that reacts with the hydrogen group. be.

The anti-adhesive agent of the present invention can be obtained by reacting an organosilicon compound having at least one hydrogen group with a hydrocarbon compound having at least one double bond that reacts with the hydrogen group.

Examples of the organosilicon compound having at least one hydrogen group include polymethylhydrogensiloxane, polymethylhydrodimethylsiloxane copolymer, and the like. Examples of the hydrocarbon compound having at least one double bond that reacts with the hydrogen group of the organosilicon compound include α-olefin, polyethylene wax, 1,4-polyptadiene, 1,2-polybutadiene, polybutene, 1-octadecene, etc. A mixture of the following can be mentioned. An example of a method for producing an anti-adhesive agent is to mix polymethylhydrogensiloxane (including polymethylhydrodimethylsiloxane copolymer) with an α-olefin having one vinyl group at the end, and use chloroplatinic acid as a catalyst. Add and heat to cause an addition reaction. The obtained reaction product is purified by washing several times with acetone, etc., and then dried.
The anti-adhesive agent synthesized as described above may be kneaded into the heat-sealing resin layer, that is, the resin layer of the liquid contact surface layer of the liquid paper container, but the anti-adhesive agent is only necessary in a limited heat-sealing area. Therefore, it is uneconomical to knead it into all the liquid-contacting surface layers because it will use more than necessary. Therefore, the anti-adhesive agent of the present invention, like the conventional ones, is dissolved in a solvent and applied as needed to the minimum necessary location using a base polymer such as ethyl cellulose or cyclized rubber. It is desirable that For example, in Figure 1, which is a developed view of a milk carton, the minimum required area is the spout heat-sealed part (2) at the top of the polyethylene laminated carton paper (1).
). Although there are no particular restrictions on the coating method, the printing method is economically advantageous because it is necessary to apply the minimum necessary amount to the required areas. Ethyl acetate and toluene, which are approved, are used as solvents. However, the anti-adhesive agent of the present invention can also be used as a water-soluble emulsion type. For either type, the concentration of the coating fluid naturally depends on the amount of coating, but it also largely depends on the silicone ratio of the anti-adhesive agent (the proportion of organic silicon molecules in the anti-adhesive molecules) and cannot be determined unconditionally. . However, the anti-adhesive agent is available as a toluene solution from 1 to
It is used as a 2-3% by weight solution with a silicone content of 6% by weight, more preferably 30%. In addition, during coating, the use of ethyl cellulose or cyclized rubber as a base polymer is permitted, and may be added as necessary. To give an example of a preferable coating, depending on the printing method,
Flexo printing is particularly preferred, with a wet coating weight of 2
~5 g/rrf.

[Action/Effect]

The present invention provides an anti-adhesive agent obtained by reacting an organosilicon compound having at least one hydrogen group with a hydrocarbon compound having at least one double bond that reacts with the hydrogen group;
That is, the present invention is characterized by providing an anti-adhesive agent comprising an organic silicon compound and a so-called comb-shaped graft copolymer in which a chain of a hydrocarbon compound is grafted onto the main chain.

Unlike conventional silicone resins, the anti-adhesive agent of the comb-shaped graft copolymer has an affinity for the applied polyethylene resin layer by grafting hydrocarbon compound chains, and it also skillfully controls the releasability of the silicone resin. It has a molecular structure. Therefore, it is possible to meet contradictory demands for adhesion and peeling at the same time under a wide range of conditions.

[Examples] The present invention will be explained below with reference to Examples and Comparative Examples.
The present invention is not limited in any way by these.

In the following, unless otherwise specified, "parts" and "%" mean "parts by weight" and "% by weight," respectively.

Synthesis example polymethylhydrogensiloxane (P=600, M
W=44000) 25.2 parts, α-olefin (“Dialene-30”, manufactured by Mitsubishi Chemical Industries, MW=650) 74
．． 8 parts and 3 parts of a 0.1% Hz PtCIk.6H20 isopropyl alcohol solution were charged into a reactor, and the addition reaction was carried out at 120°C for 5 hours, and further reacted at 120°C for 6 hours. After cooling, the solidified reaction product was washed five times with acetone to remove unreacted parts, purified, and dried. The silicone content of the anti-adhesive agent obtained was 25.2%.

Test polyethylene resin laminated paper for milk cartons: Low-density polyethylene resin laminated paper having the following structure was obtained by a conventional method.

Composition: Printing/Low density polyethylene resin layer 20μm/Gable base material for one ton of milk force 340g/s”/Low density polyethylene resin layer (liquid contact layer) 40μm For one ton of milk force, gable top type 1000 I made it into a paper container and tried it out.

Example 1 The anti-adhesive agent obtained in the synthesis example was dissolved in toluene to form anti-adhesive agent 3.
% toluene solution. Next, as shown in Figure 1,
Polyethylene laminated paper for one ton of milk sample (
An anti-adhesive agent of 0.12 g/n{ (dry) was applied to the upper pouring heat seal part (2) of 1) using a flexographic printing method. After making one ton of milk, milk was filled and poured, and the heat-sealed part (2) was heat-sealed. The heat sealing conditions were 245°C, 2kg/cd, and 3 seconds.

A carton for sealing strength measurement was separately produced by heat sealing under the same conditions as above.

The container obtained as described above showed no damage to the container or air leakage in the sealing strength test, and the opening of the heat-sealed area was easy, and the opening area after opening was clean.
The spout was hygienic. The results are shown in Table 1.

Comparative Example 1 The same procedure as in Example 1 was carried out, except that silicone oil and polydimethylsiloxane [SH-200 (500CS) J, manufactured by Toray Silicone] were dissolved in toluene and a 3% toluene solution was used as an anti-adhesive agent. .

In the sealing strength test of the obtained carton, there was no damage to the container, but air leakage was observed from the heat-sealed spout. The results are shown in Table 1. Comparative Example 2 The same operation as in Example 1 was carried out except that the anti-adhesive agent was not applied to the pressed Roheat seal portion.

In the sealing strength test of the obtained carton, no damage to the container or air leakage was observed. However, the opening at the heat-sealed area was not smooth, and the opening had hangnails, which made the product look bad, and milk was collected in the hangnails, making it unsanitary. The results are shown in Table 1.

Table 1 * Sealing strength Based on standard tests for polyethylene-processed paper containers and packaging for milk and dairy products, published in Official Gazette No. 15672, published on April 16, 1972.

[Brief explanation of drawings]

Figure 1 is an exploded view of a milk carton. I...Polyethylene laminate processing 2 ・Spout human seal part 3 ・Bottom part

Claims (1)

[Scope of Claims] 1. An anti-adhesive agent obtained by reacting an organosilicon compound having at least one hydrogen group with a hydrocarbon compound having at least one double bond that reacts with the hydrogen group. 2. The anti-adhesive agent according to claim 1, which is obtained by adding an olefinic macromer having at least one terminal vinyl group to polymethylhydrodienesiloxane and/or polymethylhydrodimethylsiloxane copolymer.