JPS5847042A - Self-adhesive packaging film - Google Patents

Abstract

PURPOSE:To provide the titled film which has excellent cutting properties, tackiness, blocking resistance and microwave oven applicability and is useful for the hermetical packaging of foods, by molding into a film a resin compsn. consisting of PP and a nucleating agent and having an n-heptane-extraction residue content within a specified range. CONSTITUTION:0.01-1pt.wt. nucleating agent such as benzoic acid or thioglycolic anhydride is blended with 100pts.wt. PP to obtain a compsn. having an n- heptane-extraction residue content of 30-95wt%. If necessary, 0.01-5pts.wt. surfactant such as propylene glycol 8-22C fatty acid ester or an alkylbenzene sulfonate is added thereto. The mixture is kneaded and pelletized. The pellets are extruded at 200-280 deg.C through an inflation die or a T-die. The extrudate is cooled with water or a cooling roll to obtain a self-adhesive packaging film of 7-20mu in thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polypropylene I [for self-adhesive packaging with a lubricant composition] lume, and in detail, the present invention relates to polypropylene I lume, which has improved cuttability, adhesion, anti-blocking property and t This invention relates to a self-adhesive packaging film that has excellent adhesive properties.

This self-adhesive packaging material, 71 lumen, is widely used in households, restaurants, hotels, etc. for hermetically sealing food, preventing it from drying out when stored in the refrigerator, and heating it in the microwave. It has sound effects such as preventing drying when stored, preventing flavor or odor from dispersing or absorbing odor during storage, and preventing dust from adhering when used for commercial purposes. With the recent spread of microwave ovens, the demand for this application is rapidly increasing.

In other words, to prevent food from evaporating and losing flavor when it is cooked or mixed in a microwave oven, a container containing the food (generally made of ceramic or glass) is used. It is used for hermetically sealed packaging.

The cutting mechanism and usage method of 71 lum for self-adhesive packaging used for such purposes is, for example, for core material such as 6 paper tubes! !
It is stored in a case such as a fully loaded medium 20-451 and a thickness of 10-20 Jl, such as a Fulm T1 paper box. The film is inspected and cut into appropriate lengths, and the film's adhesive properties are used to seal the openings of food storage containers and food containers.

The 10k "saw blade" used for cutting film is:
Generally, a simple blade is used, which is a saw-shaped blade punched out of an iron plate with a size of 11.2 ml'a.
A paper box made of coated cardboard with a weight of about 0 g/- is used, and its rigidity is extremely low.

This type of film is intended to be easily cut according to the user's wishes using such a simple cutting mechanism, but in reality, the case or the "saw blade" may become deformed. Not only that, but the film may deform, or
Cutting may occur at a position 5+B'+ from the saw blade. Specifically, when cutting a film made of conventional polyvinylidene chloride, a crack is formed in a part of the film, and the crack widens and forms along the "saw blade". The product is cut diagonally without being cut. Further, conventional polyethylene films are subjected to a considerable tensile force when cut, and the case does not only bend, but the film also deforms.

-The demand for self-adhesive packaging films for this purpose has increased dramatically with the recent spread of microwave ovens. In other words, when food is cooked in a microwavable oven or stirred, the moisture in the food evaporates and the flavor is lost.
To prevent this, containers containing food (generally ceramic or crow-grade containers) are used.

) is used for sealed packaging.

The packaging film used for such purposes has the property of having small heat shrinkage in a microwave oven and not causing heat melting or whitening phenomenon, which is referred to as microwave oven suitability (6) 1. is required. However, conventional polyvinylidene chloride films have the disadvantage of large shrinkage when heated, and conventional polyethylene films have a 11t71 The drawback is that the lume melts, and on the other hand, conventional 71 lume made of polyvinyl chloride causes a whitening phenomenon when it comes into contact with boiling water, making it unsuitable for use. Therefore, these conventional self-adhesive packaging films and chairs are not fully suitable for microwave ovens.

The present inventors have conventionally tried to use poly-10-pyrene mainly If1. Proceed with the development of packaging film named a.
We strived to improve the adhesiveness, transparency, cuttability, storage stability, and microwave suitability, and as a result of extensive research, we completed the present invention.

An object of the present invention is to provide a self-adhesive packaging film that has excellent adhesion and transparency, improved cuttability, pro-wrecking dust resistance, and microwave oven suitability. It is.

The above object of the present invention is to provide 100 parts of polypropylene,
A self-adhesive packaging film made of a polypropylene resin composition containing 0.01 to 1 part of a nucleating agent and having a normal heptane extraction residue of 301 t% or more (more than 9511). This is achieved by

According to a preferred method of the present invention, 0.01 to 1 part of a nucleating agent is contained per 100 parts of polypropylene, the crystallization of the polypropylene is raised to 2°C or more, and normal hebutane extraction is carried out. A self-adhesive packaging film is produced by forming a film from one part of polypropylene 411 resin containing 95 parts of the remainder.

The present invention will be explained in detail below. In addition, in the present invention, “
"Parts" means "parts by weight", and the polypropylene resin composition according to the present invention is mainly composed of fibrobylene. It also contains one type of other α-olene (eg, d-ethylene, butene, hexedyl, etc.) or a copolymer with Fi2dan9.

Core III used in the present invention is made of polyethylene 100m
Addition 1 is capable of raising the crystallization temperature of the unpainted polypropylene resin composition by 2° C. or more by adding 0.0 l-1ift to K.

Such nucleating agents include aromatic and saturated aliphatic dicarboxylic acids, benzoic acid, nucleo-converted benzoic acid, fn1 dicarboxylic acid, and various grades of these, as well as silicic anhydride, thioglycolic anhydride. acid, ζradluenesulfonic acid,
Examples thereof include talc, e&c1fc 711 aluminum, thiodiglycolic anhydride, pt-butylbenzoic acid, aluminum pt-bunalbenzoate, dibenzylidenon rubitol, and the like.

If the content of the nucleating agent used in the present invention is less than 0.01 parts, the effect of the present invention cannot be seen, and if it exceeds 1 part,
This causes the appearance of dust on the surface of the film, impairing the sense of hygiene.

Generally, a differential thermal analysis device (Dif-fe) is used for crystallized wet hair.
Rental The-rmal Analysis
), Differential S
However, in the present invention, the crystallization temperature refers to the temperature measurement measured using a differential erosion calorimeter (manufactured by Rigaku wo Ki Kogyo) under the following 6C measurement conditions. .

〔Measurement condition〕

When measuring the crystal turbidimetry of a sample using the above-mentioned apparatus and measurement conditions, a melting peak was first observed, and then a melting peak was observed at 250°C.
When the temperature is raised to 1, the temperature begins to decrease and a crystallization peak is observed.

In the present invention, the crease at the point on this crystallization curve that is farthest from the base line 1 is defined as crystallization am. Like this 4C+l! The determined crystallization a1 degree varies slightly depending on the processing of each strain.

The above-mentioned nucleating agent that can be used in the present invention is known as a nucleating agent or crystallization promoter 1111, and is used, for example, by injection molding. It is used to increase the transparency and mechanical properties of thick molded products produced in factories by adding it to resin compositions. However, in the field of thin film, it is currently considered worthless. However, surprisingly, when the nucleating agent as an additive described above was used to raise the temperature of the crystallization seawater [k2°C or more] in the IJ fluoropylene resin composition, the strength of the nucleating agent significantly increased. It was found that it improved. Particularly, in the present invention, by combining the nucleating agent of the present invention with poly-10-pyrene having a normal heptane extraction residue of 1 in the suite of the present invention, it is possible to obtain cutting property tliL with soil having sufficient viscosity.
In this specification, normal heptane extraction residue refers to l5ot, which is commonly used in polypropylene.
This is a numerical value measured by a method substantially the same as the #j standard method of the active index, and is extracted with boiled normal heptane using a 1-lumen Soxhlet extractor for 24 hours. The remainder is then dried and weighed, and the value is calculated as the ratio to the total weight of the film before extraction.

In addition, the extracted content is mainly atacte'sokboliglobileno, but is not limited to this, and includes other aspect ratio hydrogen, rosin, petroleum resin, etc. In 2Fk14, the normal hebutane extraction residue is 95%. If the amount exceeds 50%, that is, if the extracted amount is less than 50%, the adhesiveness or adhesion to ceramic or glass containers, and the adhesiveness or adhesion of the film itself to other members will deteriorate. . −
power, normal heptane extraction residue exceeds 30i [if the extraction amount exceeds 70tii:Ik)1
The lum itself is too flexible, and the value measured by the one-child oven suitability measurement method described below is 100°C or less, making it unsuitable for microwave ovens. In this BA, in order to obtain microwave oven suitability of light, the normal hebutane extraction residue must be 90 to 6011
Polypropylene resin compositions are available in limited quantity.

The normal hebutane extraction residue used for making this bag is 95%
~30% by weight poly-10-pyrene resin composition c) When producing a polypropylene resin composition using a normal poly-10-bire/homopolymer and/ma+ti random copolymer,
At least one normal hebutane extract component selected from the group consisting of atactic polypropylene, petroleum resin, rosin, and other aspect ratio hydrogen is added to strain 1 or without addition [7
, this normal hebutane extraction residue is 30 to 95 times fj1
%.

In the present invention, by adding 0.01 to 5 parts of surfactant-1 during the production of the raw material for the polypropylene resin composition of the present invention or during the manufacturing error of maO, the cutting property as well as the blocking phenomenon can be prevented. performance can be imparted. In misfire #3, the following are effective surfactants: b0 glycerin fat 117j12 (
Cg-C22) ester, sorbitan fat Dfllt (
Cs-C22) ester, propylene glycol ghl
EFjal (Cg~C22) ester, sucrose side EB
H(Cg-Cz) ester, citric acid mono(di or tri)stearate, pentaerythritol-kmEB
tl (Cs-C1g) ester, polyglycerin h
EB acid (Cs-Ctg) ester, polyoxyethylene (20) glycerin fat 11 (C12-CI+5) ester, polyoxyethylene (20) and tongue fat IF
jllccx2~Cxs) ester, polyethylene glycol aEHe (C9~C20) ester, polypropylene glycol If[E7j II (Ca-CIll
) ester, polyoxyethylene (9,5) dodecyl ether, polyoxyethylene (4-14, 30-50
) alkyl (C4.9.12) phenyl ether, N,
N-bis(2-hydroxyethyl) Jig fat (C12~
C1g) amine, fatty acid (C12-C1g) amine,
Condensation product of fatty acid (C12-C1s) and jetanolamine, polyoxybrobylene polyoxyethylene polymer, polyethylene glycol (molecular weight 200-9500), polypropylene glycol, alkyl (C1o-C20) sulfonate (Na・ni-NH
il), alkyl (C9-C20) benzene sulfonate (Na@KIINH4) alkylnaphthalene sulfone tlk salt (Na), sodium dialkyl (C4.5.6
・8.15) Sulfosuccinate, alkyl (C1O~
C20) sulfate (Na@11NH4), potassium stearate, N-acyl CCs to C1g) sarcosinate, etc. are effective. Conventionally, blocking phenomenon @
A compound containing fatty acid amide threads has been used to reduce the viscosity, but it cannot be used in unexploited #4vL because it inhibits self-viscosity.

According to the present invention, the addition of filter surfactant 1 is 0.01
If the amount is less than 5 parts, the effect of improving cuttability will not be seen, and if it exceeds 5 parts, problems such as a decrease in self-adhesiveness and a decrease in brightness will occur.

In the present invention, general additives may be included in addition to the cage processing of the present invention described above. The mold may optionally contain an antioxidant, a stabilizing agent, an anti-blocking agent, an anti-staining agent, and the like.

In addition,? IIJIJ is not suitable for use because it impairs self-adhesion.

It is optional to the method of manufacturing the film according to the present invention.

For example, polyethylene of the present invention and a nucleating agent (and surfactant) or atactic polypropylene or the like are extruded into a poly-10-pyrene resin composition together with other additives such as an antioxidant, a stable cutting agent, and an anti-rotation cutting agent. Knead using a machine etc.
It is made into pellets and can be used as a raw material for film formation as described below.

Poly-10-pyrene 11jlh whose crystallization temperature is raised to 112°C or more and contains various additives according to the present invention
Regarding film formation of the composition, the general 11! Membrane law can be adopted. For example, using the 1-inflation method and the T-da 1 method, a 71 lumen can be easily extruded! It is preferably about 200 to 280°C, extruded through a JJ-shaped or flat plate-shaped slit, and cooled and solidified in water or on a cooling roll. The thickness of the film according to the invention may be the same as that of a conventional so-called laminate film, and is generally F17 to F20p.

It should be noted that it is not necessary that the blends of polyethylene, core, and surfactant used in the present invention can be completely blended when the polypropylene resin composition is made into pellets;
! It may be done at the time of the call or at other times.

Hereinafter, the present invention will be illustrated by examples, but the embodiments of the present invention are not limited thereto.

Performance 1 100 parts of a polypropylene resin composition (Mikata Toatsu Chemical Co., Ltd., Sankata Noprene, GPL-G) was added with anhydrous ft-y! J
:l-ru@0.25! 11 kilS was added, the crystallization increase sitΔTc was 2.5°C, and 1 part of glycerin stearate was added to the normal hebutane extraction residue t-93i & fume, and after mixing with a mixer, 220
The material was made into a pellet by the method of Tsutomi at 100°C and then made into a pellet with the following specifications (1111 m and a thickness of 13 μm) to obtain a steel plate according to the present invention.

This sample N11l) had a haze value of 1.5 lumen, was completely transparent, and had good adhesion to ceramic containers. In addition, mtm according to the microwave oven aptitude measurement method below.
The temperature was also 140°C.

['III Microwaving resistance measurement method]

Place 2.5 mK paper on the top and bottom of a strip-shaped film sample piece with a medium size of 3ts and a length of 14m, and weigh it with a weight of 10g (1).

It is displayed in increments of 11 degrees t - 10 degrees Celsius for the daytime atmosphere that does not expire in one hour (see Tokyo Metropolitan Ordinance No. 1072 "Quality indication of Rapflum lum").

The cutting properties were good; just by applying it to a conventional "saw blade" and pulling it lightly, the JX cut straight away, and there were no diagonal cuts. In addition, a storage test was conducted by winding a film of sample N11l around a core tube, and even under long-term high temperature storage conditions, no blocking phenomenon was observed, and the storage stability was good.

Example 2 Polypropylene resin composition (manufactured by Mikata Toatsu Chemical Co., Ltd.).

0.5s of sebacic acid and 15 parts of active polypropylene were added to 100 parts of three-piece Noprene j (FL-G), and the crystallization increased ii #ΔTc = 5°C, and the normal heptane extraction residue t-60 parts Extruded pellets were obtained from the pellets that had been smoothed by 1°.

A film of 10j was made using a machine manufactured by 1Flashion Co., Ltd. with specifications listed in item 11 above.

This film's M degree Fil. 2) It was completely self-explanatory and had sufficient self-adhesiveness. When I cut this 1r in the same way as Example 1, it was found that the Fi was a little stronger by 4 than the film of Example 1, but it cut straight with just a light pull compared to the conventional product, and there was no diagonal cut. . In addition, blocking dust particles were not bound, and the storage stability was good. Furthermore, the lagoon value according to the microwave oven suitability method is 120℃.
It was good.

Comparative Example 1 0.005 parts of thiodiglycolic acid anhydride was added to polypropylene 4II fat composition (manufactured by Mikata Toatsu Chemical Co., Ltd., Mikata Noprene, GF L-G) 1001i8, and the crystallization increased by 1 slr:ΔTe=IC A film sample was prepared in the same manner as in Example 1 using a sample with a normal to 1 ton extraction residue of 27@@%.

As a result, not only was the microwave oven suitability value of 100 degrees Celsius inferior, and the case with the "saw knife" cut ability became deformed, but also the blocking tax problem was raised in terms of storage stability. It was a failure.

Ratio 112 cases 2 Poly, propylene resin composition (Mikata Riding Chemistry 11!

0.00511 parts of thiodiglycolic anhydride was added to 100 parts of Sankata Noprene (EFL-G), and the crystallization was carried out.
Tc = 1°C, and the normal heptane extraction residue was 961°C.
Film samples were examined using the same method as in Example 2, starting from the first sample.

As a result, it was found to have poor adhesion and unstable cutting, and was rejected.

Patent applicant: Mitsui Toatsu Chemical Co., Ltd.

Claims (2)

[Claims] (1) Nucleating agent 0.01 to 100 parts of polypropylene
Poly 10 containing 1ml'ir and having a normal heptane extraction residue of 951i or more and 3011rfrs or more.
A self-adhesive packaging film made of a pyrene resin composition, which is particularly moldy. (2) Add 1 to 100 parts of polypropylene to make the surface active.
1j0.01-5111-containing, holophrobylene 11
I fat composition 11! Claims: 71 Lumens for self-adhesive packaging arranged in Section 1.