JPH06190976A - Sheet having biodegradable see-through plastic film - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to print, etc., and while it has sufficient characteristics such as strength during use, you can see the information below through it, but it is biodegraded once it is discarded. Develop a sheet that can minimize environmental pollution. A sheet in which a transparent plastic film is laminated and / or laminated, the plastic film being printable, through which the information below can be seen, biodegradable and disposed of The objective is achieved by a biodegradable sheet with a transparent plastic film, which is characterized in that it is biodegradable and does not pollute the environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable sheet with a transparent plastic film, and more specifically, it is used as various transparent plastic films or sheets used in business forms and the like, and is a biodegradable plastic. It is possible to print, etc., and while it has sufficient characteristics such as strength during use, you can see the information below through it, but once it is discarded it is biodegraded and causes environmental pollution. It relates to a seat that can be kept to a minimum.

[0002]

2. Description of the Related Art With the progress of information-oriented society, the field of use of business forms has been expanding with the spread of computers, and various business forms have been devised, and many forms in which a transparent plastic film is incorporated in a slip Things are being used. These plastic films are used by taking advantage of the characteristics such as transparency and waterproofness, but with the increase in the amount, the problem of disposal occurs, the occurrence of corrosion at landfills in urban areas, and landfill. It has been pointed out that there is a permanent viability in the case of damage, and adverse effects on marine life when discarded in the sea. As described above, the property that plastic does not corrode becomes a problem when it is discarded, and it is not only difficult to dispose of, but also it remains permanently even after landfilling and is not returned to nature. is there. The material of the plastic film, polyethylene, polyester,
Although vinyl chloride and the like are used, printing on these requires special ink, and even when some kind of information is desired to be displayed, there is a problem that it is generally used without printing. It was

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to have sufficient properties such as strength during use, on which printing with conventional printing technology is possible, and through which the information below can be seen. However, it is to expand the means of transmitting information by providing a sheet with a transparent plastic film that can be biodegraded once it is disposed of to minimize environmental pollution.

[0004]

In view of the above points, the present inventor has made earnest studies, and as a result, as a result, transparent used in business forms such as transport slips, confidentiality postcards, empty envelopes, and slips with transparent envelopes. By replacing the plastic film or sheet with biodegradable plastic, it is possible to minimize the environmental pollution when these vouchers are used and then discarded, and make the most of the characteristics of the degradable plastic film. It has been found that the convenience of a slip can be improved by printing it, and the present invention has been completed.

The invention according to claim 1 of the present invention is a sheet obtained by laminating and / or laminating a transparent plastic film, the plastic film being printable, and seeing the information below. It is a biodegradable sheet with a transparent plastic film, which is characterized by being biodegradable and biodegradable after disposal and not polluting the environment. Claim 2 of the present invention
The invention according to claim 1 is a business form, and the sheet according to claim 1.

Next, the present invention will be described in more detail. Biodegradable plastics and photodegradable plastics are currently on the market as degradable materials.The former are decomposed into water and carbon dioxide by the action of microorganisms when they are buried in the soil. However, there is no pollution to the environment at all, and the latter is decomposed by the action of ultraviolet rays in the sunlight, and has a very small load on the environment.

Photodegradable plastics include, for example, ethylene-carbon monoxide copolymers and vinyl ketone-vinyl monomer copolymers as a photosensitive functional group-introducing type, and plastics such as polyethylene can be used as a photosensitizer with a metal. There is a type of polymer to which a compound or the like is added. These plastics have problems that their decomposition rate changes significantly depending on the change of sunshine duration in summer and winter, that the original function of plastics cannot be exhibited due to poor transparency, and that processing is difficult due to its high rigidity. The suitability as a business form, that is, the strength, the transparency, and the printability are not always sufficient, and it is often necessary to examine the materials and study the processing method. Also, the photodegradable polymer will not decompose unless left in a place exposed to sunlight, so when it is discarded, a vast land is required for the exposure site,
Although it may be effective where there is land like the United States, in the case of Japan, there is a problem that it may not match the actual situation.

On the other hand, a biodegradable plastic is a plastic that is decomposed by microorganisms in soil,
Broadly speaking, there are those that use bioplastics produced by microorganisms, those that use natural polymers, and those that use biodegradable synthetic polymers. Many microorganisms are capable of storing polyester as an energy storage substance in cells under conditions which are not necessarily suitable for reproduction of bacterial cells, for example, conditions where there is a carbon source but no nitrogen source. Among these microorganisms Alcaligenes eu
Glucose and propionic acid are given to Trofus to produce a copolymer of 3-hydroxybutyric acid (3-HB) and 3-hydroxyvaleric acid (3-HV). These plastics derived from microorganisms are naturally biodegradable because they are substances that are naturally produced by living organisms.

Examples of the biodegradable plastics derived from natural products include those obtained by blending starch, which is a natural product, and synthetic polymers into disintegrating plastics. For example, those obtained by adding starch to polyethylene, those obtained by adding starch to low molecular weight petroleum products, and those utilizing chitin, chitosan or cellulose obtained from crustaceans are applicable. Also, as a biodegradable plastic derived from a natural product, there is a composition comprising starch and a plastic to which a certain kind of additive is added, in which the additive which is a decomposition accelerator reacts with a metal salt in the soil. The resulting peroxide is said to cleave the polymer chains.

Polylactic acid, polymalic acid and the like as biodegradable synthetic polymers have already been used as medical polymers, and polycaprolactone (PCL) is also used.
and so on. There are also biodegradable synthetic polymers by blending PCL with PHB, calcium carbonate, etc., copolymerizing a fatty acid polyester with an aromatic polyester, and utilizing an amide-transesterification reaction between an aliphatic polyester and a polyamide. PCL is a thermoplastic polyester that is degraded by microorganisms.

The biodegradable, see-through plastic used in the present invention is a plastic material produced by the above-mentioned microorganism (eg, polyhydroxybutyrate, hydroxybutyric acid-hydroxyvaleric acid copolymer, etc.). , A composition composed of starch and polyethylene, a polycaprolactone composition, a composition composed of polycaprolactone and polyethylene, a composition composed of polycaprolactone and a natural mineral, a composition composed of starch and polyvinyl alcohol, and the like, suitable as a business foam, That is, it is not particularly limited as long as it has strength, transparency, printability, workability, etc., and all of these can be used.

Among them, those obtained by using polyhydroxybutyrate, a hydroxybutyric acid-hydroxyvaleric acid copolymer, a composition of starch-polyvinyl alcohol, etc. as a raw material are easily biodegradable and suitable for processing, and can be preferably used. .

[0013]

The sheet obtained by laminating and / or laminating the transparent plastic film of the present invention uses a biodegradable plastic as various transparent plastic films or sheets used in business forms and the like. It has properties such as strength, and it is possible to print on it, and the information below can be seen through it, but once it is disposed in the soil or the sea, it is biodegraded early and pollutes the environment. It is possible to minimize.

[0014]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention. (Example 1) A biodegradable plastic film (trade name: Matterby, manufactured by Novamont) (thickness: 30 mμ) made of corn starch and polyvinyl alcohol (thickness: 30 mμ) was cut into 140 mm × 200 mm, and from June to December 1992. During this period, one was left indoors for 6 months and the other was buried in the soil, and changes in appearance and weight were evaluated over time. As a result, there was no change in appearance or weight of the product left inside the room. On the other hand, the one buried in the soil became considerably opaque after 100 days, the weight became 73% before the test, became translucent after 180 days, had holes in the worm-eaten state, and became brittle without strength, Weight is 4 before the test
It decreased to 2%. This is believed to reduce the environmental damage caused by plastic, which has been a problem in the past.

Example 2 A biodegradable plastic film made of polyethylene containing starch as a raw material (trade name:
Ecostar (made by Hagiwara Kogyo Co., Ltd.) (thickness 30 mμ) is cut into 140 mm x 200 mm, and one is left indoors for 6 months from June to December 1992, the other is in the soil. It was embedded in the test piece, and changes in appearance and weight were evaluated over time. As a result, there was no change in appearance or weight of the product left inside the room. On the other hand, the one buried in the soil became slightly opaque after 100 days and weighed 9% before the test.
It became 0%, became opaque after 180 days, became brittle without strength, and the weight was reduced to 80% before the test. This is believed to reduce the environmental damage caused by plastic, which has been a problem in the past.

Comparative Example 1 Polyethylene film (trade name: Sekisui Unix, manufactured by Sekisui Chemical Co., Ltd.) (thickness 3
0 mμ) was cut into 140 mm × 200 mm and tested in the same manner as in Example 1. As a result, there was no change in appearance or weight of the one left indoors or the one buried in the soil, and the transparency and strength were maintained.

Comparative Example 2 A polyester film (trade name: Lumirror, manufactured by Toray) (thickness 30 mμ)
It was cut into 40 mm × 200 mm and tested in the same manner as in Example 1. As a result, there is no change in appearance or weight of the one left indoors or the one buried in the soil, and the transparency,
The strength was maintained.

(Example 3) Biodegradable plastic film composed of corn starch and polyvinyl alcohol (trade name: Matterby, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)
(Thickness 30 mμ, tensile strength 235 kgf / cm ² , tear strength 300 g, opacity 15.0%) was used to produce the following business foam.

(1) DP Envelope (See FIG. 1) In the conventional DP envelope, a part of the envelope is made of polyethylene film and a window is provided in order to confirm the existence of the contents. The biodegradable film 1 was attached to the paper sheet 2 by the same processing method.
Both the natural rubber water-based latex and the acrylic solvent-based adhesive were used, but any adhesive could be used without any problem. Various items were displayed on the biodegradable film 1 by ordinary offset printing and flexographic printing with an aqueous ink, but any printing could be carried out without any trouble.

(2) Open window envelope (see FIG. 2) The biodegradable film 1 was attached to the window portion of the envelope with a rubber-based adhesive, and an open window envelope was manufactured by a conventional method.
There was no problem.

(3) Delivery slip (see FIGS. 3 and 4) FIG. 3 is an explanatory view of the delivery slip, and FIG. 4 is a sectional explanatory view of the delivery slip. The biodegradable sheet 1 is used in place of the conventional polyethylene sheet used as the top sheet of the delivery slip, and a bag portion is formed with the envelope lower paper 4 as shown in FIGS. did. Reference numeral 5 indicates a release paper, and 6 indicates an adhesive. After tap water was sprayed for 1 minute with a shower, it was wiped with a towel and the slip 3 inside was visually observed, but it was possible to use without seepage of water.

The opacity of the films used in Examples 1 to 3 and Comparative Example 1 was measured and compared. (Measurement Method of Opacity) A photovoltmeter (using a green filter) was used to measure the reflectance of the standard white board and the standard blackboard, and the respective values were adjusted to 68.8% and 0%. Next, the sample is placed on each standard plate, and the reflectance through the sample, that is, the value R _W from the white plate and the value R _B from the blackboard are measured. The opacity is calculated by the following formula.

[0023]

[Table 1] As can be seen from Table 1, the Ecostar film is slightly opaque, but the Matterby film is close to the polyethylene film, which is usually perceived as transparent, and can be said to be quite transparent.

[0024]

INDUSTRIAL APPLICABILITY The biodegradable sheet with a transparent plastic film of the present invention uses a biodegradable plastic as various transparent plastic films or sheets used in business forms and the like, and is used for printing, etc. It is possible to use, and while it has sufficient properties such as strength during use, you can see the information below through it, but once it was disposed, it was biodegraded and it was possible to minimize environmental pollution. Since it is a product, it has a great industrial utility value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a DP envelope according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a windowed envelope according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a delivery slip according to another embodiment of the present invention.

FIG. 4 is a cross-sectional explanatory diagram of a delivery slip.

[Explanation of symbols]

 1 biodegradable film or sheet 2 paper sheet 3 slip 4 envelope bottom paper

Claims (2)

[Claims] 1. A sheet of laminated and / or laminated transparent plastic films, which is printable and through which the information below can be seen and which is biodegradable. , A biodegradable sheet with a transparent plastic film, which is biodegradable after disposal and does not pollute the environment. 2. The sheet according to claim 1, which is a business form.