JPH10324809A - Resin composition and pressure-sensitive adhesive film made therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition useful for obtaining film which shows excellent self-tack even when the amount of the pressure-sensitive adhesive and that of the tackifier are small and shows excellent adhesion to articles by including a thermoplastic resin, a pressure-sensitive adhesive incompatible therewith and a tackifier in a specified ratio and selecting at least the tackifier from among normally liquid ones. SOLUTION: This composition comprises 100 pts.wt. thermoplastic resin and 0.01-3 pts.wt., desirably 0.01-1.0 pt.wt. each of a pressure-sensitive adhesive and a tackifier. The thermoplastic resin is desirably a polyester resin, a halogen- containing resin or a polyamide resin. The adhesive desirably has a viscosity of 1,000-50,000, desirably 1,500-25,000 cP at 25 deg.C and is desirably polybutene or polybutadiene. The tackifier desirably has a viscosity of 10-199 cP, desirably 30-60 cP at 25 deg.C and is desirably a liquid paraffin or a surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin composition which can be used for producing an adhesive film used for packaging foods, industrial materials and the like. More specifically, the present invention relates to a resin composition comprising a thermoplastic resin and an incompatible pressure-sensitive adhesive and a tackifier, and a film having excellent tackiness obtained therefrom. The film obtained from the resin composition of the present invention has excellent self-adhesiveness and adhesion to articles, and can impart high airtightness to the package.

[0002]

2. Description of the Related Art A wrap film used for packaging food and industrial materials is provided with an adhesive property for the purpose of enhancing the airtightness in the package. Techniques for imparting tackiness to thermoplastic resins are often found in polyolefin-based resins, and achieve the purpose by using a tackifier and a tackifier alone or in combination. In JP-A-56-5842,
There has been proposed a polypropylene resin composition comprising 100 parts by weight of a polypropylene resin, 3 to 20 parts by weight of a polyolefin rubber, 5 to 30 parts by weight of polybutene, and 0.1 to 10 parts by weight of a tackifier. JP-A-53-829
In JP-A-5, polyolefin resin, thermoplastic rubber,
BACKGROUND ART Adhesive films for packaging comprising a liquid viscous aliphatic hydrocarbon have been proposed. In a conventional film, a large amount of a pressure-sensitive adhesive must be added to impart sufficient tackiness. In addition, in order to uniformly mix a large amount of pressure-sensitive adhesive, it must be melt-mixed by some means in advance, and a viscous pressure-sensitive adhesive may be difficult to handle, and adhesiveness is easily and effectively obtained. A resin composition is desired.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin composition which is easy to produce and contains a small amount of a pressure-sensitive adhesive, and a film comprising the same, which has excellent tackiness.

[0004]

Means for Solving the Problems The present inventors have found that by increasing the concentration of the pressure-sensitive adhesive on the film surface, it is possible to effectively increase the adhesiveness of the film with a small amount of the pressure-sensitive adhesive used. The invention has been completed.

[0005] The present invention relates to a resin composition comprising a thermoplastic resin and a pressure-sensitive adhesive and / or tackifier incompatible with the thermoplastic resin, and a film having high tackiness obtained from the resin composition. . ADVANTAGE OF THE INVENTION According to this invention, the film which has sufficient self-adhesiveness and the outstanding adhesiveness with respect to objects is obtained despite addition of a small amount of adhesives and / or tackifiers. That is, the first aspect of the present invention comprises a thermoplastic resin, a pressure-sensitive adhesive and a tackifier, the pressure-sensitive adhesive and the tackifier are incompatible with the thermoplastic resin, and at least the tackifier is liquid at room temperature, 100 parts by weight of a plastic resin,
A resin composition containing 0.01 to 3 parts by weight or less of an adhesive and a tackifier is provided. A second aspect of the present invention is a vinylidene chloride resin 100 containing a liquid plasticizer and a stabilizer.
Parts by weight, and a pressure-sensitive adhesive and a tackifier which are incompatible with the vinylidene chloride resin and are liquid at room temperature are combined in a total amount of 0.02 to 0.02.
100 parts by weight of a vinylidene chloride resin containing a resin composition and a liquid plasticizer and a stabilizer containing 1 part by weight or less, and a liquid pressure-sensitive adhesive at room temperature that is incompatible with the vinylidene chloride resin, At least one of 0.0
Provided is a resin composition comprising 1 to 1 part by weight or less. A third aspect of the present invention provides an adhesive film comprising the resin composition, wherein one layer has a thickness of 1.5 to 20 μm or less.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The thermoplastic resin used in the present invention includes a polyester resin, a halogen-containing resin, a polyamide resin, a polyolefin resin and the like. As useful resins as packaging materials, polyester resins include polyglycolic acid,
Polylactic acid, polysuccinate, polycaprolactone, aliphatic polyester resins such as copolymers of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, polybutylene terephthalate, and aromatic polyester resins such as polyethylene terephthalate, especially A copolymer polyester resin of a dicarboxylic acid component such as terephthalic acid and isophthalic acid and a diol component is preferred.

Examples of the halogen-containing resin include polyvinylidene fluoride and its copolymer, and examples of the polyvinyl chloride and vinylidene chloride resin include polyvinylidene chloride and its copolymer. The vinylidene chloride copolymer is a copolymer comprising 60 to 98 parts by weight of vinylidene chloride and 2 to 40 parts by weight of at least one monomer copolymerizable with vinylidene chloride. As the monomer copolymerizable with vinylidene chloride, any monomer can be used as long as it is a copolymerizable monomer. Typical examples thereof include vinyl chloride and an acrylate having an alkyl group having 1 to 8 carbon atoms. Examples thereof include a methacrylic acid ester having an alkyl group having 1 to 8 carbon atoms, a vinyl ester of an aliphatic carboxylic acid, and an unsaturated aliphatic carboxylic acid, and vinyl chloride, methyl acrylate, and butyl acrylate are preferably used. Is done.

Examples of the polyamide resin include nylon 6, nylon 6-66, nylon MXD6 and the like. Examples of polyolefin resins include polyethylene, polypropylene and their copolymers, poly-4-methylpentene-1, and the like. These thermoplastic resins and modified thermoplastic resins are formed into thin and flexible films. Is suitable for wrap film.

The adhesive used in the present invention is polybutene,
Examples include olefin oligomers such as polybutadiene and polypropylene, and polypolyhydric alcohols such as polyethylene glycol, polyglycerin, and polypropylene glycol. Among them, an adhesive that is liquid at normal temperature (25 ° C.) is used. Preferably, the viscosity at 25 ° C is 1,000 to
50,000 cps, particularly preferably 1,500 to 2,
Those in the range of 000 cps are suitable for use. The amount of the adhesive used is 0.01 to 3 parts by weight or less, preferably 0.01 to 1.0 part by weight, per 100 parts by weight of the thermoplastic resin.
Parts by weight or less, more preferably 0.05 to 0.5 parts by weight or less.

[0010] The tackifier imparts the property of easily adhering to an object. Liquid at room temperature,
From the viewpoints of being thermally stable during melt molding and easy handling, the viscosity at 25 ° C. is preferably from 10 to 100 cps, particularly preferably from 30 to 60 cps. Specific tackifiers include surfactants such as sorbitan fatty acid esters, propylene glycol fatty acid esters, and glycerin fatty acid esters such as sorbitan mono (tri) olate and glycerin mono (tri) olate; paraffinic and cycloparaffinic surfactants. Liquid saturated hydrocarbons, for example, naphthenic process oil, paraffin wax, liquid paraffin and the like can be mentioned. It may be a single compound or a mixture. The amount of the tackifier is based on 100 parts by weight of the thermoplastic resin.
0.01 to 3 parts by weight or less, preferably 0.01 to 1.0 part by weight
Parts by weight or less, more preferably 0.05 to 0.5 parts by weight or less.

If the amount of the pressure-sensitive adhesive or tackifier is too large or if the viscosity is too low, the extrudability tends to deteriorate, and the film tends to be sticky and difficult to handle. Excessive viscosity is not preferred because extrudability tends to deteriorate. The present invention
The adhesiveness changes depending on the combination of the above-mentioned materials, that is, the adhesiveness is effectively obtained by the resin composition composed of the combination of the thermoplastic resin and the incompatible adhesive or tackifier. Here, being incompatible with the thermoplastic resin means that bleeding of the liquid is recognized in the evaluation of incompatibility described later.

When a vinylidene chloride-based copolymer containing a liquid plasticizer and a stabilizer is used as the thermoplastic resin, the liquid-state pressure-sensitive adhesive and tackifier which are incompatible with the vinylidene chloride-based copolymer are used. Is 0.02
A resin composition containing 1 part by weight or less, or a pressure-sensitive adhesive that is incompatible with a vinylidene chloride-based copolymer at room temperature and at least one of tackifiers, 0.01 to 1 part by weight or less, more preferably A film obtained from a resin composition containing 0.05 to 0.5 parts by weight or less is suitably used. The above-mentioned adhesives and tackifiers can be arbitrarily selected and used. Specific examples of the liquid plasticizer and stabilizer include dioctyl phthalate, acetyl tributyl citrate, dibutyl sebacate, dioctyl sebacate, diisobutyl adipate, acetylated monoglyceride, and adipic acid-based polyester (average weight molecular weight of 100).
0 to 4000), epoxidized oils such as soybean oil and linseed oil, and epoxy group-containing stabilizers.

The thickness of the film obtained from the resin composition of the present invention is not particularly limited, but the thickness of one layer is preferably 1.5 to 20 μm or less, preferably 5 to 20 μm.
It is as follows. A laminate structure made of this resin composition may be used. In this case, a configuration in which curling does not occur in the film, for example, a symmetric configuration is preferable.

The resin composition according to the present invention can be obtained by a known method. For example, a method of kneading each component of a thermoplastic resin, a pressure-sensitive adhesive, and a tackifier with an extruder and pelletizing with a pelletizer is usually used. Henschel mixer, blade blend,
A ribbon blend is used. For molding into film, T
Die molding, inflation molding and the like are usually used.
The resin temperature at the time of molding differs depending on the resin used, and is performed in a desired temperature range. It may be a wrap film which is subjected to a heat-shrinkage by adding a stretching step. The resin composition of the present invention is also effective as a material for imparting tackiness to molded articles, and may be used in combination with these molded articles, for example, a sheet or an injection molded article and a wrap film. When the resin composition of the present invention is molded, known plasticizers, stabilizers, lubricants, pigments and the like may be added.

[0015]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. (Evaluation method) 1. Incompatibility: 1 part by weight of a liquid sample to be evaluated for compatibility is added to 100 parts by weight of a thermoplastic resin as a target resin to be evaluated for incompatibility, a kneaded resin composition is prepared, and press-molded. A sheet having a thickness of 200 μm was prepared. The state of the sheet when this was left in an environment of 40 ° C. for one week was observed. (): When the surface of the sheet is wiped with tissue paper, the added sample hardly oozes out on the paper side. (X): When the sheet surface was wiped off with tissue paper, the added sample was seeping out on the paper side. In this evaluation, (x) was determined that the liquid sample was incompatible with the target resin. 2. Viscosity: Measured with a B-type viscometer (JIS). 3. Self-adhesiveness: The surfaces of two wrap films (width 25 mm) lined with cellophane tape were put together, pressed with a 2 kg roller, and the pressed surfaces were separated by hand. ：: moderately sticky. Δ: Not very sticky. ×:
Stick. 4. Adhesion to objects: After wrapping a wrap film on a porcelain teacup and then passing it through a frame with the diameter of the teacup plus 5 mm, the appearance of the film coming off the teacup was observed. ：: Moderately adhered. Δ: Does not adhere very much. ×: Adhered. 5. Feeling of the wrap film: After the wrap film produced by the inflation method was left under an environment of 40 ° C. and 50% RH for 10 days, the feel of the surface of the film was observed. ：: Smooth (good) Δ: Sticky (slightly poor). ×: too sticky (bad)

Reference Example According to a method for evaluating compatibility, a copolymer polyester (terephthalic acid / isophthalic acid (9
0/10 weight ratio) and polyethylene glycol (manufactured by Kanebo Co., Ltd.) and a vinylidene chloride copolymer and an adhesive /
The incompatibility with the tackifier was evaluated, and the results are shown in Tables 1 and 2.

[0017]

[Table 1]

[0018]

[Table 2]

Examples 1 and 2 and Comparative Examples 1 to 3 100 parts by weight of the copolymer polyester of the reference example were used as a thermoplastic resin, and an adhesive and a tackifier were added in the proportions shown in Table 3 (unit: Parts by weight) to obtain a pellet-shaped resin composition with a twin-screw extruder. The pellets are formed using a T-die molding machine.
A film having a thickness of 15 μm was obtained. Evaluate the self-adhesiveness of this film, the adhesion to objects and the feel of the film,
The results are shown in Table 3.

(Examples 3 to 6 and Comparative Examples 4 to 7) As a thermoplastic resin, 100 parts by weight of a vinylidene chloride copolymer (manufactured by Kureha Chemical Co., Ltd., resin composition; vinylidene chloride /
(Vinyl chloride = 88/22 weight ratio), ATB as an additive
C (acetyltributyl citrate) 3 parts by weight, DO
2.3 parts by weight of A (dioctyl adipate) and 1.3 parts by weight of epoxidized linseed oil were mixed by a blade blend and biaxially oriented by inflation molding using a single screw extruder to obtain a film having a thickness of 10 μm. . The self-adhesiveness, adhesion to objects and feel of the film were evaluated, and the results are shown in Table 3.

[0021]

[Table 3]

[0022]

As described above, the film made of the resin composition of the present invention exhibits excellent self-adhesiveness with a small amount of the adhesive and / or tackifier added, and at the same time, has excellent adhesiveness to objects. have.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 71/02 C08L 71/02 77/00 77/00 // (C08L 101/00 23:20 9:00)

Claims (10)

[Claims] 1. A composition comprising a thermoplastic resin, a pressure-sensitive adhesive and a tackifier, wherein the pressure-sensitive adhesive and the tackifier are incompatible with the thermoplastic resin, and at least the tackifier is liquid at room temperature. A resin composition containing 100 parts by weight of a resin, 0.01 to 3 parts by weight or less of an adhesive and a tackifier. 2. The resin composition according to claim 1, comprising 100 parts by weight of a thermoplastic resin, 0.01 to 1.0 parts by weight of an adhesive and a tackifier, respectively. 3. The pressure-sensitive adhesive has a viscosity of 1,000 to 5 at 25 ° C.
The resin composition according to claim 1, wherein the resin composition has a molecular weight of 000 cps. 4. A tackifier having a viscosity of 10 to 10 at 25 ° C.
The resin composition according to claim 1, wherein the resin composition has 0 cps. 5. The resin composition according to claim 1, wherein the pressure-sensitive adhesive is polybutene or polybutadiene. 6. The resin composition according to claim 1, wherein the tackifier is liquid paraffin or a surfactant. 7. The resin composition according to claim 1, wherein the thermoplastic resin is a polyester resin, a halogen-containing resin, or a polyamide resin. 8. A mixture of 100 parts by weight of a vinylidene chloride resin containing a liquid plasticizer and a stabilizer, and a normal temperature liquid adhesive and a tackifier which are incompatible with the vinylidene chloride resin in a total amount of 0.02 to 0.02. A resin composition comprising 1 part by weight or less. 9. 100 parts by weight of a vinylidene chloride resin containing a liquid plasticizer and a stabilizer, and at least one of a pressure-sensitive adhesive and a tackifier which are incompatible with the vinylidene chloride resin and are liquid at room temperature. A resin composition comprising from 0.01 to 1 part by weight. 10. A pressure-sensitive adhesive film comprising the resin composition according to claim 7, wherein one layer has a thickness of 1.5 to 20 μm or less.