JPH0485022A - Manufacture of peel ply and laminate with said peel ply - Google Patents

Abstract

PURPOSE:To provide peeling force usable without trouble on an automatic machine by laminating a laminate composed of specified three components on a substrate by the extrusion laminating method. CONSTITUTION:A peel ply composed of a compound prepared by the reaction of polyolefin synthetic resin, an organic silicon compound having at least one hydrogen radical with a hydrocarbon compound having at least one double bond reacting with said hydrogen radical and an ethylene.alpha-olefin copolymer is laminated on a substrate by the extrusion laminating method. The same can be used without trouble on an automatic machine by said arrangement. The peeling force, for instance, at 0.3m/min (low speed) is 10g/25mm width or less, and the peeling force, for instance, at 200m/min (high speed) is 100g/25mm width or less. Also, a tape (sheet) can be laminated on said peel ply, and magic ink can be applied with good writing effect and also non-slipping properties are provided.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a release layer and a method for manufacturing a laminate including the release layer. The present invention relates to a release layer that has a small peeling property, is suitable for use in automatic machines, and has excellent peelability, and a method for producing a laminate having the release layer.

[Conventional technology and problems]

Silicone resins are known as typical conventional release agents. However, silicone-based #I fats have problems such as migration of silicone to the surface of the pressure-sensitive adhesive layer, inability to overlay tapes (sheets), poor writing performance with marker ink, and slipping properties. There are many problems.

In order to solve this problem, fatty acid amide is blended into the release layer, and the shear modulus is 2.0XIO" dyne/d or more (JIS K 7213) and the surface wetting property is a surface tension of 50 dynes/ell. Equilibrium contact angle 55 for
Ethylene α- that is more than @ (JIS K 6768)
A method using an olefin copolymer as the main component of the release layer is known. However, this type of release layer has low peeling speed (0,
Although it has excellent mold releasability at high-speed peeling II (150-250 m/lll1n)
), the peeling force is large, so the reality is that it cannot be used in automatic machines that are used at high speeds.

In view of the above circumstances, it is an object of the present invention to provide a release layer having excellent release properties by reducing the release force at all speeds from low to high speeds suitable for automatic machines.

In other words, in order to be able to use it without trouble in an automatic machine, the peeling force at 0.3 m/sin (low speed) must be 1.
0g/25m+width or less is required, and for example 200
Peeling force at m/sin (high speed) is 100 g/2
5-middle or lower is required, and the object of the present invention is to provide a release layer that satisfies these requirements.

Another object of the present invention is to provide a tape (
The object of the present invention is to provide a release layer that can be laminated (sheets), has good marker ink writing properties, and has non-slip properties.

[Means for solving problems]

That is, the first aspect of the present invention is that the main component of the release layer is the following (A).
, (B) and (C); (A) a polyolefin synthetic resin; (B) an organosilicon compound having at least one hydrogen group; and a double layer that reacts with the hydrogen group. The second aspect of the present invention is to form a compound obtained by reacting a hydrocarbon compound having at least one bond, (C) an ethylene/α-olefin copolymer, with the above-mentioned release layer on a support by an extrusion lamination method. Each content is a method of manufacturing a laminate having a release layer, which is characterized by lamination.

Since (B) and (C), which are the release components of the present invention, have insufficient film-forming performance when used alone, it is essential to blend the polyolefin synthetic resin, which is the component (A). Component (A) includes, for example, thermoplastic resins such as polyethylene, polypropylene, ethylene/vinyl acetate copolymer, ethylene/ethyl acrylate copolymer, and ethylene/acrylic acid copolymer. They may be used alone or in combination of two or more.

A compound obtained by reacting a silicon compound having at least one hydrogen group, which is component (B) of the present invention, with a hydrocarbon compound having at least one double bond that reacts with the hydrogen group is , is described in detail in JP-A-633076. Examples of the organosilicon compound include polymethylhydrodiene siloxane, polymethylhydro-dimethylsiloxane copolymer, etc., and mixtures thereof. Examples of the hydrocarbon compound having at least one bond include α-olefin, polyethylenewanx, 1,4-bolybutadiene, 1,2-polybutadiene, polybutene, 1-octadecene, etc., and mixtures thereof.

The ethylene/α-olefin copolymer which is component (C) of the present invention preferably has a density of 0.80 to 0.90 g/cj, and the α-olefin is an alkene having a double bond at the α position, For example, propylene, 1-pentene, 1-
Butene, 4-methyl-1-pentene, 1-hexene, 1
-C3 to octene, 2-ethylhexene-1, etc.
There are 8 examples. Examples of the ethylene/α-olefin copolymer include ethylene/1-butene (random) copolymer, ethylene/propylene copolymer, etc.
They may be used alone or in combination of two or more.

The blending ratio of the above components (A), (B) and (C) is (A
) to 70 to 98.5 parts by weight of component (B).
5 to 10 parts by weight, component (C) is preferably 1 to 20 parts by weight, more preferably component (A) is 85 to 96 parts by weight, component (B) is 2 to 5 parts by weight, and component (C) is 85 to 96 parts by weight. 2-1 (1
Parts by weight. However, (A) + (B) + (C) = 1
00 parts by weight.

If component (B) is less than 0.5 parts by weight, the effect of reducing the peeling force from the low speed range to the high speed range will not be sufficient, and if it exceeds 10 parts by weight, not only will kneading become difficult,
The effect of lowering the peeling force also does not increase in proportion to the amount blended. Furthermore, if component (C) is less than 1 part by weight, the effect of reducing the peeling force in the low speed range is insufficient, and if it exceeds 20 parts by weight, the peeling force in the high speed range becomes large, which is unsuitable.

In addition to the above-mentioned main components, the release layer of the present invention contains pigments, stabilizers, fillers, plasticizers, pickpockets, anti-slip agents, antistatic agents, cross-linking agents, etc., as necessary, without reducing the release function. It may be contained within a range.

The above-mentioned release layer is usually laminated on a support. Examples of the support include paper, cloth, nonwoven fabric, cellophane, various unstretched or stretched (uniaxially, biaxially) synthetic resin films, metal foils, etc. alone or in composites. The lamination method is not particularly limited, but an extrusion lamination method is suitable. In addition, the release layer is extruded to form a film, which is stretched (l axis, 2
There is also a method of attaching the base (shaft) and then adhering it to the support. others,
It is also reasonable to form an integral film by coextruding the release layer and the support and then stretching the film. In order to increase the adhesive force between the release layer and the support, an adhesion-enhancing layer may be interposed between the two. The adhesion enhancing layer is preferably a resin of the same type as component (A), but is not particularly limited as long as it achieves the purpose of enhancing adhesion.

The laminate having a release layer on the support obtained as described above is useful, for example, as a base material for adhesive tapes and sheets. The adhesive used in this case is not particularly limited as long as it is a pressure-sensitive adhesive, but it is preferable to use one mainly composed of polyacrylic esters, such as those consisting only of polyacrylic ester, polyacrylic ester-based adhesives, etc. Examples include copolymers with vinyl monomers such as vinyl acetate, vinylidene chloride, methacrylic acid esters, acrylic acid, and methacrylic acid in an amount of 25% or less relative to the ester, and these may be used alone or in combination of two or more. used. Examples of polyacrylic ester include methyl, ethyl, butyl, 2
- Esters such as ethylhexyl are common. In addition, pigments, drugs (salicylic acid esters, nitroglycerin, etc.), tackifiers, plasticizers, fillers, anti-aging agents, cross-linking agents, etc. may be added to the pressure-sensitive adhesive as necessary. .

Next, an example of laminating a release layer on a support by an extrusion lamination method will be described.

(A), (B) and (C), which are the main components of the present invention, are blended using a well-known method, for example, using a pelletizer.

The temperature at which the formulation is extrusion laminated onto the support is the temperature at which the formulation is extrusion laminated onto the substrate.
270-3, which is a slightly lower temperature than 00-350°C
A temperature of about 00°C is desirable. This is because the release performance of the release layer is closely related to the extrusion temperature, and the lower the extrusion temperature, the better the release performance can be obtained.

If the adhesion between the release layer and the support is weak, sequential extrusion lamination or coextrusion lamination may be performed such that an adhesion-enhancing layer is provided on the support and a release layer is provided on top of it.In the case of coextrusion lamination It is desirable that the extrusion temperature of the adhesion-enhancing layer is higher than the extrusion temperature of the formulation forming the release layer, thereby achieving both excellent release properties and excellent adhesion to the support. The laminated film thickness is preferably 15 to 30 μm in total including the release layer and one adhesion enhancement layer, however,
Because the release layer forms a uniform film due to extrusion technology, 3.
A thickness of μm or more is required.

Next, an adhesive 1PIN is formed into an adhesive tape or sheet. In the case of an adhesive tape, the adhesive is coated on the release layer or on the opposite side of the support, and after drying, it is rolled up into a tape shape. In the case of a pressure-sensitive adhesive sheet, the pressure-sensitive adhesive is directly coated on the release layer or the support on the opposite side, and after drying, the pressure-sensitive adhesive is formed into a pressure-sensitive adhesive sheet. Emulsion type or hot melt type adhesives are best. A well-known method can be used to form the adhesive 1FIN. In the case of emulsion type adhesives, it is applied by roll coating, air knife coating, etc. Dry adhesive @ temperature is 100-110°C
is preferred.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but these are not intended to limit the present invention.

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

Synthesis example of component (B) Polymethylhydrodiene siloxane (P-300, M
W=22000) 45.6 parts, α-olefin (“Dialene-30”, manufactured by Mitsubishi Chemical Industries, MW=650) 54
．． 4 parts, 0.1% H2PtCIt.

Charge 8 parts of 6H20 tetrahydrofuran/8 liquid into a reactor, conduct an addition reaction at 80°C for 8 hours, and further heat at 130°C.
The reaction was allowed to proceed for 8 hours. The viscosity of the reaction product is approximately 10,000c
The reaction was stopped when ps was reached.

The reaction product was washed three times with acetone to remove unreacted parts, and purified and dried. The silicone content of the obtained modified silicone compound (hereinafter referred to as NR-B) was 45.6%.
Met.

Example 1 Low-density polyethylene "Mirarin 1" was used as a component of the release layer.
0 P J (M + 9.5ag/sin, density 0
．． 917g/ctA, manufactured by Mitsui Petrochemical Industries, Ltd.) 9
3%, ethylene/propylene copolymer “Tafmer POI”
80 J (MI 4.5ag/win, density 0.
88g/cd, manufactured by Mitsui Petrochemical Industries, Ltd.) 5%, modified phosphoricone compound rNR-B obtained in Synthesis Example 1, 3
% were mixed in a tumbler for 10 minutes, and this mixture was pelletized with a pelletizer. Using Kurupak paper (basis weight 13 g/n (manufactured by Chuetsu Pulb Kogyo Co., Ltd.) as a support, the mixed resin pellets (for 'JLIH layer) and the adhesion enhancing layer were formed by coextrusion (multi-manifold die) lamination method. "Mirarin 10P" as a resin for
Single unit and laminated. That is, the first extruder (screw diameter 9
0++m+, L/D 29, T-die temperature 280°C), the mixed resin (for release layer), (thickness 5 μm) was applied to the second extrusion jR (screw diameter 115a, L/D 29, T-die temperature 300"). C) is a resin for adhesion enhancing layer (thickness: 15 μm).
m) and a mirror roll as a cooling roll to perform coextrusion lamination to produce a laminate having a three-layer structure of a support layer and an adhesion enhancing layer mixed resin layer (release layer), that is, a release paper. Incidentally, the surface of the support to be laminated was previously subjected to a corona discharge treatment (30-.+ain/a).

Using the obtained release paper, the peeling force and residual adhesion rate against an acrylic pressure-sensitive adhesive were measured by the following measuring method. The results are shown in Table 1.

From the results in Table 1, it can be seen that the combination of the three components (A), (B), and (C) reduces the speed (0.3m/
The component (C) covers heavy peeling in the sin) area,
Component (B) covered the drawback of component (C), which was heavy peeling in the high speed (200 m/5 inch) range, and showed stable peeling performance from low speed to high speed.

Furthermore, the surface of this release layer had marker ink writing properties, had no slip properties, and could be laminated.

Measurement of Peeling Force and Residual Adhesive Strength; Standard adhesive tape: Acrylic craft adhesive tape "Elmtave" (Lintik) was adjusted to a width of 25 m+a and a length of 210 m, and was tested.

Measurement conditions and method: The above standard adhesive tape was placed on the sample release paper using an automatic 4.5 k
They were bonded together by applying pressure back and forth at a speed of 5 m/SeC with a rubber roller of 1.5 m/SeC. Thereafter, it was aged for 20 hours in an atmosphere with a load of 20 g/ci, a temperature of 70'C, and a temperature of 65% RH, and was measured after being allowed to cool.

The peeling force at a peeling speed of 0.3 m/min was measured using an autograph tensile tester "Strograph-RJ (Toyo Seiki model), and the peeling force at a peeling speed of 3 m/min to 200 m/min was measured using a high-speed peeling tester (Tester). (manufactured by Sangyo) at a peeling angle of 180°.The environmental conditions at the time of measurement were a temperature of 23° C. and a humidity of 65% RH.

Comparative Example 1 of Adhesion Strength of Standard Adhesive Tape Not Adhered to the Peeling Layer Surface Using the same support as used in Example 1, the surface to be laminated was subjected to corona discharge treatment (30 sin/rr) in advance.
After applying r), “Mirarin 10P” was added as a component of the release layer.
J100% extruded with T die m<screw diameter 90x, L/
Extrusion laminate (thickness: 20 μm) L and release paper were produced using D29 and T die temperature of 320'c>. The measurement results of peel force and residual adhesion rate are shown in Table 1.

Comparative Example 2 Example 1 except that the components of the release layer on the support were only two components: 97% of 1Mirason 10P and 3% of NR-BJ.
A release paper was prepared in the same manner as above.

The measurement results of peel force and residual adhesion rate are shown in Table 1.

Comparative example 3 The component of the release layer on the support is "Mirason 10P.

A release paper was prepared in the same manner as in Example 1 except that only two components were used: 94% and rNR-8.6%.

The measurement results of peel force and residual adhesion rate are shown in Table 1.

Comparative Example 4 A release paper was produced in the same manner as in Example 1, except that the release thickness on the support consisted of only two components: 95% "Mirason 10P" and 5% "Tafmer PO180J."Peeling force and residual adhesion The measurement results of the ratio are shown in Table 1.

Comparative example 5 The component of the peeling thickness on the support is "Mirason IOP.

A release paper was prepared in the same manner as in Example 1, except that only two components were used: 92% and Tafmer PO180J8%.

The measurement results of peel force and residual adhesion rate are shown in Table 1.

Comparative Example 6 A release paper was prepared in the same manner as in Example 1, except that the release thickness on the support was composed of only two components: 70% Mirason 10PJ and 30% Tough 7-PO180J. Release force and residual The measurement results of the adhesion rate are shown in Table 1.

Table 1 [Operations and Effects] As mentioned above, the release layer of the present invention has a small peeling force and excellent peelability at all speeds from low to high speeds, and is suitable for automatic machines.

Claims (1)

[Claims] 1. The main components of the release layer are the following (A), (B) and (C).
A release layer comprising: (A) a polyolefin synthetic resin; (B) an organosilicon compound having at least one hydrogen group; and a hydrocarbon having at least one double bond that reacts with the hydrogen group. (C) Ethylene/α-olefin copolymer. 2. A method for producing a laminate having a release layer, which comprises laminating the release layer according to claim 1 on a support by an extrusion lamination method.