JP2005140939A - Print tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a print tape which has moderate flexibility and biodegradability and has good printing characteristic as well by solving the following problems; the print tape is used in a forest or on a farm land, comes off of itself and falls onto the ground and is sometimes blown off by the wind and in such a case, the print tape made of plastic is not degraded and therefore exists permanently in the forest and not only the print tape accumulates but is adversely influential if the tape is eaten by domestic animals etc. <P>SOLUTION: The print tape is formed by subjecting the tape comprised of a resin essentially composed of a polyester resin which is 50 to 1,000% in ductility in tension characteristics and has biodegradability to printing with ink. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a printing tape.

  The printing tape is used for various kinds of printing on a plastic tape, informing a danger, informing a passage, and other various transmissions. There are also prints that are letters, patterns, or just one color.

Such a printing tape (such as Patent Document 1) is often used in a forest or farmland. For example, when a tape is stretched to show a passage or range in a forest, it may come off naturally and fall to the ground or be blown away by the wind.
In such a case, since it is not decomposed by plastic, it will exist in the forest forever, and not only will it accumulate, but it will have adverse effects if eaten by livestock.
Of course, it goes without saying that it is bad for the global environment.
JP2003-138531A

  In order to prevent this, there is a tape using a biodegradable plastic. Of these, materials such as polylactic acid are difficult to stretch and substantially difficult to mold into a tape. In addition, a flexible one is too soft and difficult to use without so-called strain.

  Accordingly, a printing tape having moderate flexibility and biodegradability and good printing characteristics is provided.

  In view of the present situation as described above, the present inventor has completed the printing tape of the present invention as a result of intensive research, and the feature thereof is biodegradability with an elongation of 50 to 1000% in tensile properties. In another aspect, the polyester resin having biodegradability (flexible resin group) having an elongation of 50 to 1000% in tensile properties With 100 parts by weight, ink is applied to a tape composed of a resin mainly composed of 25 to 400 parts by weight of a biodegradable polyester resin (fragile resin group) having an elongation of 1 to 30% in tensile properties. It is in the printed point.

Here, many biodegradable polyesters are already known, and a typical one is polylactic acid. This is a self-condensation polymer of lactic acid (HOCHCH ₃ COOH), and the structural formula is HO (CHCHCH ₃ COO) _n H. This is generally not synthesized from petroleum, but mostly produced from plants.
Other linear polyesters (with or without side chains) also have biodegradability. For example, polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, hexanediol, octanediol, decanediol, glycerin, trimethylolpropane, malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, fumaric acid , Polycarboxylic acids such as maleic acid, dodecanoic acid, malic acid, tartaric acid, citric acid, and their anhydrides, and ring-opening polymers of cyclic esters such as lactide and ε-caprolactone, hydroxybutyric acid And polycondensation products such as hydroxyvaleric acid. These copolymers or a mixture thereof may be used.
Of course, it is not limited to this, and any polyester that has biodegradability may be used.

The biodegradable polyester resin as defined in claim 1 is a polyester (flexible resin group) having an elongation of 50 to 1000% in tensile properties, and may be one kind or plural kinds. In simple terms, when stretched, it stretches considerably until it breaks. What is necessary is just to select such a thing from said biodegradable polyester. It differs depending not only on the type of polyester but also on the degree of polymerization, polymerization type (block polymerization, random polymerization, etc.), and the like. In the present invention, not the molecular structure but the elongation is important, so the structure is not particularly limited.
The reason for limiting to such a flexible resin group is that it cannot be stretched otherwise and it is difficult to form a tape.

  The present invention is a tape. The term tape is used here in general terms. That is, it is long and thin with a certain width.

Furthermore, since the present invention is a printing tape, printing is performed with ink. As described above, this printing may be any type of character, pattern, symbol, etc., or simply one color. For example, when notifying the danger of a valley or the like, a warning may occur even with yellow or red.
Any ink may be used for printing, but biodegradable ink is preferable. Moreover, it may not be biodegradable but may be environmentally friendly.

In the present invention, a filler may be mixed in addition to the polyester resin. The filler referred to here simply means an extender for powder. There are organic and inorganic types. Examples of the organic type include starch, kenaf, bamboo powder, and examples of the inorganic type include talc, silica, titanium oxide, and charcoal calcium. However, according to the inventors' experiments, talc was the best. Talc is an oxide of magnesium and silicon having crystal water, and can be a crystal nucleating agent. It is thought that crystallization is promoted by adding this.
By mixing this inorganic filler, the hand cutting property (can be easily cut by hand) is improved, and a long product can be easily cut into an appropriate length by hand at the site.

  The filler is mixed in an amount of 1 to 100 parts by weight with respect to 100 parts by weight of the resin component. If the mixing amount is increased, through holes are formed when stretched, the contact area with air is increased, and biodegradability is improved.

  Further, in the present invention, a fragile resin group may be mixed with the above-described flexible resin group. The brittle resin group refers to a polyester having an elongation of 1 to 30% in tensile properties, and may be one type or a plurality of types. In simple terms, when pulled, it breaks with little elongation. Some of these are already commercially available, and polylactic acid is a representative one among the above-mentioned ones.

  The mixing ratio of the two components is preferably 25 to 400 parts by weight for the fragile resin group with respect to 100 parts by weight for the flexible resin group. This was obtained by experiment.

  In the mixture of polyesters having different physical properties, the fillers may be mixed to the same extent as described above. The effect is the same as above.

  In the resin used in the present invention (Claims 1 and 3), an additive may be further added to the above-described components. For example, pigments, fragrances, ultraviolet absorbers and the like. In short, as long as it is not contrary to the gist of the present invention, anything such as a bulking agent or other resin may be added.

  Moreover, as a tape after a shaping | molding, the elongation in the tensile characteristic is 1 to 400%, Preferably it is 1 to 250%, More preferably, 1 to 150% is good. This is determined by the mixing ratio of the vulnerable group and the flexible group.

  Furthermore, it is desirable that the maximum load stress in the tensile properties of the tape after molding is 0.1 to 2.0 gf / d, preferably 0.1 to 1.4 gf / d. This value is preferred when it is too weak, it tends to be cut when it is stretched as a printing tape, and when it is too strong, it is difficult to cut.

The printing tape of the present invention has the following advantages.
(1) Because it is biodegradable, it will not pollute the environment because it will return naturally even if left in forests or farmland.
(2) Since it is printed, it becomes various warnings and notifications.
(3) The main material is polyester, which can be manufactured as lactic acid from other than petroleum, and is friendly to the earth.
(4) Strength and flexibility are maintained in a mixture of vulnerable groups and flexible groups.

  Hereinafter, the present invention will be described in more detail based on preferred examples.

The following four polyester resins were prepared.
1 Bionore # 1001 (Polybutylene succinate / adipate: Showa Polymer Co., Ltd .: indicated as bio in the table) Elongation: 330%
2 GS PlaAZ81T (Polybutylene succinate: manufactured by Mitsubishi Chemical Corporation: indicated as GS in the table) ・ Elongation: 200%
3 Ecoflex (Polybutylene terephthalate / adipate: BASF: Eco is shown in the table) ・ Elongation: 650%
4 Lacia H440 (polylactic acid: manufactured by Mitsui Chemicals, Ltd .: labeled as Lacia in Table 1) Elongation: 8%

  The maximum load and elongation in the tensile properties were measured by the following method. The measuring method of the tensile property of the polyester resin was measured according to JISK7113. Moreover, in the case of this molded article, it was cut into a length of 300 mm, folded into four in the longitudinal direction, the distance between gripping jigs was set to 200 mm, and measurement was performed at 23 ° C. and a tensile speed of 50 to 1000 mm / min. However, in this case, since the molded product is in the form of a tape, the elongation was calculated using the generally used distance between marked lines as the distance between jigs.

Formula ρ = F / d
Where ρ: Maximum load stress (gf / d)
F: Load at maximum load (gf)
d: Denier of tape (g / 9000m)
l = (L−L ₀ ) / L ₀ × 100
l = Elongation (%)
L = Distance between marked lines at the time of destruction (mm)
L ₀ = original distance between marked lines (mm)

These four polyesters, charcoal cal, and talc were mixed as shown in Table 1. As the talc, talc MB (manufactured by Takehara Chemical Co., Ltd.) was used. The numerical values in Table 1 are parts by weight. Their physical properties and effects are shown in Table 2.

なお、成形性は、インフレーション加工時のダイから出た直後の膨らんだ状態が非常に安定のものが◎で、比較的安定が○である。
延伸性は、◎は３倍以上延伸可能、○は３倍程度は可能、△は１〜２倍程度で、×はほとんど延伸できないものである。
印刷性は、◎は良好、○は比較的良好、△は少し問題のあるものである。
比較例１、２は製品ができず、比較はできなかった。

In addition, as for formability, the swelled state immediately after coming out of the die at the time of inflation processing is very stable and is relatively stable.
As for stretchability, ◎ can be stretched by 3 times or more, ◯ can be stretched by about 3 times, Δ is about 1-2 times, and x can hardly be stretched.
As for printability, ◎ is good, ◯ is relatively good, and Δ is slightly problematic.
In Comparative Examples 1 and 2, no product was produced and comparison was not possible.

Examples 1 and 2 in Table 2 are only the flexible resin group and have a large elongation. In Examples 3 and 4, the brittle resin is mixed a little, but the elongation is still large.
When all the moldability, stretchability, and printability were combined, Examples 13 and 14 were very good.

Claims (4)

  A printing tape comprising an ink printed on a tape made of a resin mainly composed of a biodegradable polyester resin having an elongation of 50 to 1000% in tensile properties.   Furthermore, the printing tape of Claim 1 which mixes 1-100 weight part of fillers with respect to 100 weight part of resin.   Biodegradable polyester resin (fragile) with an elongation of 1 to 30% in tensile properties against 100 parts by weight of a biodegradable polyester resin (flexible resin group) with an elongation of 50 to 1000% in tensile properties A printing tape which is printed with ink on a tape made of a resin whose main component is a resin in which 25 to 400 parts by weight of a resin group) is mixed. Furthermore, the printing tape of Claim 3 which mixes 1-100 weight part of fillers with respect to 100 weight part of resin.