JPH11279393A - Biodegradable tape, packaging and packing tape, and self-adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biodegradable tape with excellent degradability, moldability and mechanical properties, and a packaging and packing tape and a self-adhesive tape using the same. SOLUTION: The biodegradable tape is obtained by adding 10-50 pts.wt. of talc to 100 pts.wt. of a biodegradable resin comprising 10-60 wt.% of ε- caprolactone, 90-40 wt.% of an aliphatic polyester such as a succinic acid-1,4- butanediol polyester, a succinic acid-ethylene glycol polyester, a succinic acid/ adipic acid-1,4-butanediol copolyester or the like and kneading, extruding and stretching the resultant mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lactone-containing resin comprising a lactone resin alone or a lactone resin and another biodegradable resin, or a lactone-containing resin composition comprising the lactone resin and a resin additive. A molded biodegradable tape having excellent degradability, moldability, and mechanical properties, and is used for packaging and packing tapes, adhesive tapes, and the like.

[0002]

2. Description of the Related Art Conventionally, packaging tapes, bands (bands are also referred to as tapes in the present invention), adhesive tape base materials,
Natural materials such as paper, or synthetic resins such as polyolefin resins, polyvinyl chloride resins, polyester resins, and polyamide resins are mainly used for labels and tapes used for various industrial materials. However, natural materials such as paper are vulnerable to moisture, which limits the range of use. When discarded, the tape produced from a synthetic resin increases the amount of garbage, and when buried, it remains semi-permanently underground, and when discarded, poses a problem of damaging the landscape. Until now, there has been no biodegradable tape that degrades in the natural environment. Therefore, in order to solve these problems, biodegradable resins have recently attracted attention. Here, biodegradable resin, when used as a material, has almost the same physical properties as general-purpose plastics, but after disposal, in the natural environment such as on soil, in soil, in compost, in activated sludge, in water, etc. Is rapidly degraded biochemically by microorganisms such as bacteria and mold, or by natural conditions such as temperature, humidity and light,
A macromolecule that is assimilated and is finely decomposed, and eventually becomes carbon dioxide and water depending on the substance.

Conventionally, as a biodegradable resin, starch, EVOH (ethylene-vinyl alcohol copolymer) resin, EVOH resin, besides a specific polyester-based biodegradable resin in order to satisfy the above requirements. Blend-based resin compositions such as aliphatic polyester-based resins and aliphatic polyester-based resins-polyolefin-based resins are known, and these resins or resin compositions are formed into various shapes such as films and put to practical use. However, in addition to the physical properties required as a biodegradable tape, the biochemical degradability required after disposal, etc., the excellent resin composition balanced in the moldability required during the production of films etc. Not yet proposed. JP-A-8-188706 discloses that a biodegradable resin, polycaprolactone (hereinafter sometimes abbreviated as PCL) is 80 to 100% by weight and a biodegradable linear polyester resin produced by living organisms. Lubricant 0.3-0.8 with respect to 100 parts by weight of a mixture with 20 to 0% by weight.
Although a biodegradable plastic film bag obtained by molding a composition comprising parts by weight is disclosed, there is a problem in mechanical strength at the time of film forming, and it is difficult to mass-produce the film. Not only that, even if the film is put into a composting device together with garbage, the biochemical decomposition of the film takes 100 days, so the decomposition rate is not sufficiently fast.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made under the above technical background by molding a resin or a resin composition having excellent decomposability, moldability and mechanical properties using a lactone resin. An object of the present invention is to provide the obtained biodegradable tape, a packaging / packing tape using the same, and an adhesive tape.

[0005]

Means for Solving the Problems As a result of intensive studies conducted by the present inventor to achieve the object, a lactone resin and a polyester resin represented by polycaprolactone are added to a lubricant, a plasticizer and a heat stabilizer. By adding
The present inventors have found that a biodegradable tape having a good balance in film moldability, film properties, biodegradability after disposal, and the like can be obtained, and have completed the present invention.

That is, the first aspect of the present invention is to provide a lactone-containing resin (c) comprising a lactone resin (a) alone or a lactone resin (a) and another biodegradable resin (b), or the lactone-containing resin (c). A) a lactone-containing resin composition (e) comprising a resin additive (d) and a biodegradable tape. In the second aspect of the present invention, a lactone resin (a)
Is ε-caprolactone, 4-methylcaprolactone,
3,5,5-trimethylcaprolactone, 3,3,5-
Various methylated caprolactone such as trimethylcaprolactone, β-propiolactone, γ-butyrolactone,
The biodegradable tape according to the first aspect of the present invention, which is a homopolymer of δ-valerolactone or enantholactone, a copolymer of two or more of these monomers, or a mixture of these homopolymers or copolymers. . A third aspect of the present invention provides the biodegradable tape according to any one of the first to second aspects of the present invention, wherein the other biodegradable resin is a synthetic and / or natural polymer.
Fourth, the synthetic polymer is an aliphatic polyester,
A biodegradable tape according to the third aspect of the present invention, comprising a biodegradable cellulose ester, polypeptide, polyvinyl alcohol, or a mixture thereof. The fifth of the present invention
Is a natural polymer, starch, cellulose, paper, pulp,
A biodegradable tape according to the third aspect of the present invention, which comprises cotton, carrageenan, chitin / chitosan, natural linear polyester resin, or a mixture thereof. A sixth aspect of the present invention is that the resin additive is a plasticizer, a heat stabilizer, a lubricant, an antioxidant, an ultraviolet stabilizer, an antistatic agent, a flame retardant, a dropping agent, an antibacterial agent, a deodorant, a filler, a coloring agent. Or a biodegradable tape according to any one of the first to fifth aspects of the present invention, which is a mixture thereof. A seventh aspect of the present invention is any one of the first to sixth aspects of the present invention, which comprises 10 to 60% by weight of a lactone resin and 90 to 40% by weight of an aliphatic polyester (the total of the lactone resin and the aliphatic polyester is 100% by weight). The invention provides a biodegradable tape as described. An eighth aspect of the present invention is that the lactone resin is poly-
s-caprolactone, wherein the aliphatic polyester is succinic acid / 1,4-butanediol polyester, succinic acid / ethylene glycol polyester, or succinic acid / adipic acid / 1,4-butanediol copolyester. 2. A biodegradable tape according to the item 1. A ninth aspect of the present invention provides the biodegradable tape according to the eighth aspect of the present invention, comprising 100 parts by weight of polycaprolactone and aliphatic polyester in total and 10 to 50 parts by weight of talc. A tenth aspect of the present invention provides the biodegradable tape according to any one of the first to ninth aspects of the present invention, which is reinforced with biodegradable fibers.
An eleventh aspect of the present invention provides the biodegradable tape according to any one of the first to tenth aspects of the present invention, which is uniaxially or biaxially stretched. A twelfth aspect of the present invention provides the biodegradable tape according to any one of the first to eleventh aspects of the present invention, which has irregularities on one or both surfaces. A thirteenth aspect of the present invention relates to the first to first aspects of the present invention.
2. A packaging / packaging tape comprising the biodegradable tape according to any of 2. A fourteenth aspect of the present invention provides the biodegradable tape according to any one of the first to twelfth aspects of the present invention, which has at least one of an adhesive layer, a release agent layer, and a heat seal layer on one or both surfaces. . According to a fifteenth aspect of the present invention, there is provided an adhesive tape comprising the biodegradable tape according to the fourteenth aspect of the present invention.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lactone resin used in the present invention is a homopolymer of a lactone monomer, a lactone copolymer comprising two or more lactone monomers, or a copolymer of a lactone monomer and a monomer other than the lactone monomer. , And mixtures thereof. Examples of lactone monomers include ε-caprolactone; 4-methylcaprolactone, 3,5,5-trimethylcaprolactone,
Various methylated caprolactones such as 3,5-trimethylcaprolactone; β-propiolactone; γ-butyrolactone; δ-valerolactone; and enantholactone. Examples of the monomer other than the lactone monomer copolymerized with the lactone monomer include aliphatic hydroxycarboxylic acids such as lactic acid, hydroxypropionic acid, and hydroxybutyric acid; aliphatic diols and aliphatic dicarboxylic acids exemplified by the aliphatic polyester described below. Can be Examples of polycaprolactone include Plaxel H (manufactured by Daicel Chemical Industries, Ltd.).

In the present invention, another biodegradable resin may be used in combination with polylactone. The other biodegradable resin is not particularly limited as long as it is a resin that can be molded into a biodegradable tape in combination with the lactone resin, and various known synthetic and / or natural polymers are used. As a synthetic polymer,
Examples thereof include aliphatic polyesters, biodegradable cellulose esters, polypeptides, polyvinyl alcohols, and mixtures thereof described below. Natural polymers include starch,
Cellulose, paper, pulp, cotton, wool, silk, carrageenan,
Chitin / chitosan, natural linear polyester resin,
Or a mixture thereof.

An aliphatic polyester resin as a synthetic polymer is a polyester resin other than a lactone resin,
It is an aliphatic polyester resin obtained by a condensation polymerization system.
Examples of the aliphatic polyester resin, polylactic acid, polymers of hydroxycarboxylic acids such as polylactic acid copolymer,
Copolymers: polyesters and copolyesters of low molecular weight aliphatic dicarboxylic acids and low molecular weight aliphatic diols. Examples of the polylactic acid include ECOPLA (manufactured by Cargill), Lacty (manufactured by Shimadzu Corporation), and the like. Examples of the polyester of a low-molecular aliphatic dicarboxylic acid and a low-molecular aliphatic diol include a linear or branched aliphatic diol having 1 to 10 carbon atoms and a polyester composed of a linear or branched aliphatic dicarboxylic acid having 1 to 10 carbon atoms. Is preferred. A diol content of 20% by weight to 70% by weight and an aliphatic dicarboxylic acid content of 30% by weight to 80% by weight are used. As the aliphatic polyester resin, G
Number average molecular weight is 2 in terms of standard polystyrene by PC
0000 or more and 200,000 or less, preferably 40,
More than 000 can be used. An aliphatic polyester resin having a low molecular weight may be reacted with an aliphatic diisocyanate such as hexamethylene diisocyanate to increase the molecular weight. Commercially available polyesters from diol / aliphatic dicarboxylic acids include polyethylene succinate, polybutylene succinate,
Examples thereof include biodegradable polyester resins such as polybutylene succinate / adipate, for example, Bionole # 1000 series, # 3000 series, and # 6000 series (manufactured by Showa Polymer Co., Ltd.).

When polycaprolactone and polylactic acid are used, the mixing weight ratio is from 99/1 to 1/99, preferably from 90/10 to 60/40. When using a polyester from polycaprolactone and a diol / aliphatic dicarboxylic acid, the weight ratio is 80/20 to 10/9.
0, preferably in a range of 50/50 to 20/80. When a mixture of three kinds of polylactic acid, polyester from diol / aliphatic carboxylic acid, and biodegradable polymer of polycaprolactone is used, the polymerization ratio of polyester from diol / aliphatic carboxylic acid to polycaprolactone is 20/80 to 80. / 20 and the polymerization ratio between polylactic acid and polycaprolactone is from 20/80 to 80/20.

The biodegradable cellulose esters include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; inorganic acid esters such as cellulose nitrate, cellulose sulfate, and cellulose phosphate; cellulose acetate propionate; Hybrid esters such as cellulose acetate butyrate, cellulose acetate phthalate and cellulose nitrate acetate can be exemplified. These cellulose esters can be used alone or in combination of two or more. Among these cellulose esters, organic acid esters, particularly cellulose acetate, are preferred.

Examples of the polypeptide as the synthetic polymer include polyamino acids and polyamide esters.

[0013] Examples of the starch include raw starch, processed starch, and mixtures thereof. Examples of the raw starch include corn starch, horse bell chopsticks starch, sweet potato starch, wheat starch, cassava starch, sago starch, tapioca starch, rice starch, legume starch, kuzu starch, bracken starch, lotus starch, and heishi starch. Examples of the starch include physically modified starch (α-starch, fractionated amylose, wet heat-treated starch, etc.), enzyme-modified starch (hydrolyzed dextrin, enzyme-decomposed dextrin, amylose, etc.), chemically-modified starch (acid-treated starch, hypochlorite). Acid-oxidized starch, dialdehyde starch, etc.) and chemically modified starch derivatives (esterified starch, etherified starch, cationized starch, cross-linked starch, etc.). Among the above, as the esterified starch, acetate-starch, succinate-starch, nitrate-starch, phosphate-starch, urea-phosphate-starch, xanthate-starch, acetoacetate-starch Etc .; etherified starch such as allyl etherified starch, methyl etherified starch, carboxymethyl etherified starch, hydroxyethyl etherified starch and hydroxypropyl etherified starch; etc .; cationized starch includes starch and 2-diethylaminoethyl chloride , A reaction product of starch and 2,3-epoxypropyltrimethylammonium chloride, etc .; Examples of the crosslinked starch include formaldehyde crosslinked starch, epichlorohydrin crosslinked starch, phosphoric acid crosslinked starch, and acrolein crosslinked starch. The amount of the starch added is not particularly limited, but in order to effectively achieve the purpose of addition, 10% by weight of the lactone resin or 100 parts by weight of the total amount of the lactone resin and the aliphatic polyester resin. The amount is preferably from 80 to 80 parts by weight, and particularly preferably from 25 to 50 parts by weight.

As the lubricant used in the present invention, those generally used can be used. For example, fatty acid esters, hydrocarbon resins, paraffins, higher fatty acids, oxy fatty acids, fatty acid amides, alkylene bis fatty acid amides, aliphatic ketones, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters, fatty acid polyglycol esters, fatty alcohols, Examples include a hydric alcohol, polyglycol, polyglycerol, metal soap, modified silicone or a mixture thereof. Preferably, fatty acid esters, hydrocarbon resins and the like are used. The compounding amount is 0.05 to 5 parts by weight, preferably 0.1 to 3 parts by weight of a lubricant based on 100 parts by weight of the lactone resin or the total of the lactone resin and other biodegradable resin. If the amount is less than 0.05 part by weight, the effect is not sufficient, and if the amount is more than 5 parts by weight, the material is not wound around a roll, and the physical properties are deteriorated. As a commercially available product, RIQUESTER EW-100 (manufactured by RIKEN Vitamin Co., Ltd.)
And Hoechst wax OP (manufactured by Hoechst).

Examples of the plasticizer used in the present invention include aliphatic dibasic acid esters, phthalic acid esters, hydroxy polycarboxylic acid esters, polyester plasticizers, fatty acid esters, epoxy plasticizers, and mixtures thereof. For example, di-2-ethylhexyl phthalate (D
OP), phthalic acid esters such as dibutyl phthalate (DBP) and diisodecyl phthalate (DIDP), adipic acid esters such as di-2-ethylhexyl adipate (DOA), diisodecyl adipate (DIDA), and azelaic acid-diamine Polyester plasticizers such as azelaic acid esters such as -2-ethylhexyl (DOZ), hydroxy polyvalent carboxylic acid esters such as tri-2-ethylhexyl acetylcitrate and tributyl acetylcitrate, and polypropylene glycol adipate; Is used in one kind or in a mixture of two or more kinds. Preferably, di-2-ethylhexyl azelate (DO)
Z). The addition amount of these plasticizers is preferably in the range of 3 to 30 parts by weight based on 100 parts by weight of the lactone resin or the total of the lactone resin and another biodegradable resin. Further, it is preferably 5 to 15 parts by weight. 3
If it is less than parts by weight, elongation at break and impact strength will be low,
On the other hand, if it exceeds 30 parts by weight, the breaking strength and the impact strength may be undesirably reduced.

The heat stabilizer used in the present invention includes an aliphatic carboxylate. As the aliphatic carboxylic acid, an aliphatic hydroxycarboxylic acid is particularly preferred. As the aliphatic hydroxycarboxylic acid, naturally occurring ones such as lactic acid and hydroxybutyric acid are preferable. Examples of the salt include salts of sodium, calcium, aluminum, barium, magnesium, manganese, iron, zinc, lead, silver, copper, and the like. These can be used as one kind or as a mixture of two or more kinds. The amount of the lactone resin, or a total of 100 parts by weight of the lactone resin and the other biodegradable resin, in the range of 0.5 to 10 parts by weight, preferably,
It is in the range of 0.5 to 5 parts by weight. When the heat stabilizer is used within the above range, the impact strength (Izod impact value) is improved, and there is an effect that variations in elongation at break, strength at break, and impact strength are reduced.

The lactone resin, the lactone resin composition or the composition to which the various additives are further added, if necessary, a photodecomposition or biodegradation accelerator, a lactone resin and a fat as components of the resin composition Resin components other than the aromatic polyester resin (eg, ethylene / vinyl acetate copolymer (EVA) and other polyolefins, hydrogenated styrene butadiene rubber, polyurethane, polyamide, polyhydroxybutyrate, etc.), and natural polymers other than the above-mentioned starch (For example, polysaccharide-based polymer, cellulose-based polymer, protein-based polymer, etc.), fine powder particles having a diameter of 50 μm or less and manufactured from paper, heat stabilizer, filler, talc, calcium carbonate, etc. Agents, lubricants, coloring agents, flame retardants, water resistance agents, autoxidants, UV stabilizers, crosslinkers, antibacterial agents, herbicides, antioxidants, It can be added to the deodorant and the like.
Urea, alkaline earths, alkali metal hydroxides and mixtures thereof can also be added as starch modifiers. Fillers such as talc and calcium carbonate are mixed with a total of 100 parts by weight of a lactone resin such as polycaprolactone and an aliphatic polyester such as polybutylene succinate and a filler such as talc, 10 to 50 parts by weight. You.

Examples of the ethylene / vinyl acetate copolymer include those having an ethylene content of 10 to 70% by weight and a vinyl acetate content of 30 to 90% by weight, preferably an ethylene content of 20 to 40% by weight. It has a vinyl acetate content of 60 to 80% by weight. When the vinyl acetate content is less than 30% by weight, the elongation at break decreases, and when the vinyl acetate content exceeds 90% by weight, the impact strength (Izod impact value) decreases. The weight average molecular weight is preferably about 50,000 to 500,000, and if it is less than 50,000, the breaking strength and the yield strength are reduced, and the breaking elongation is also reduced. If it exceeds 500,000, the breaking strength decreases. EVA is added in an amount of 5 to 70 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight of the total of the lactone resin or the lactone resin and the other biodegradable resin. E
If the VA is less than 5 parts by weight, sufficient elongation at break and impact strength cannot be obtained, and if the EVA exceeds 70 parts by weight, the transparency of the present composition is reduced, and the strength is greatly reduced. Commercially available E
For VA, Ebaslen 250, 310P, 450P
(Manufactured by Dainippon Ink and Chemicals, Inc.). When the present invention is applied to a biodegradable tape, the addition of EVA is preferable because the shrinkage at low temperatures is improved (excellent in low-temperature shrinkability).

Examples of the photodegradation accelerator include benzophenones such as benzoins, benzoin alkyl ethers, benzophenone and 4,4-bis (dimethylamino) benzophenone and derivatives thereof; acetophenone,
acetophenones such as α, α-diethoxyacetophenone and derivatives thereof; quinones; thioxanthones; photoexcitants such as phthalocyanine, anatase-type titanium oxide, ethylene-carbon oxide copolymer, sensitization of aromatic ketones with metal salts And the like. These photolysis accelerators are
One type or two or more types can be used in combination.

Examples of the biodegradation accelerator include oxo acids (for example, oxo acids having about 2 to 6 carbon atoms such as glycolic acid, lactic acid, citric acid, tartaric acid, and malic acid), saturated dicarboxylic acids (for example, Organic acids such as lower saturated dicarboxylic acids having about 2 to 6 carbon atoms such as oxalic acid, malonic acid, succinic acid, succinic anhydride, glutaric acid and the like; these organic acids and alcohols having about 1 to 4 carbon atoms; Lower alkyl esters. Preferred biodegradation promoters include organic acids having about 2 to 6 carbon atoms, such as citric acid, tartaric acid, and malic acid, and coconut shell activated carbon. One or more of these biodegradation accelerators can be used in combination.

Hereinafter, the lactone resin according to the present invention will be described using polycaprolactone as a typical example. Polycaprolactone has a number average molecular weight of 10,000.
~ 1,000,000 is preferred, but 100,000 ~
500,000 are particularly preferred. The polycaprolactone having the above-mentioned molecular weight has a relative viscosity of 1.15 to 2.80 according to JIS K6726, and particularly preferably has a relative viscosity of 1.50 to 2.80. Examples of commercially available polycaprolactone include Plaxel (manufactured by Daicel Chemical Industries, Ltd.).

Preferred examples of the resin composition used in the present invention include a mixture of a lactone resin and a synthetic aliphatic polyester resin as main polymer components and a fatty acid amide. It contains silica and / or starch. When a fatty acid amide, a liquid lubricant, finely divided silica, starch or the like is added, a mixture of a lactone resin and an aliphatic polyester resin is referred to as a resin, and the addition ratio is indicated by the ratio to the resin. The resin composition has a melt flow index (MI) of 190.
0.5 to 20 g, measured with a load of 2160 g at 0 ° C
/ 10 min is preferable, and 1 to 5 g / 10 min is particularly suitable. The polycaprolactone and the aliphatic polyester resin are used as a mixture. The compounding weight ratio of polycaprolactone and the aliphatic polyester resin is 70 to 5% by weight of polycaprolactone, the aliphatic polyester resin is 30 to 95% by weight, and the compounding weight ratio of polycaprolactone is preferably 60% by weight or less. And particularly preferably 40 to 10% by weight. If the amount of the aliphatic polyester resin exceeds 90% by weight, the biodegradability becomes slow. On the other hand, if the amount is less than 30% by weight, heat resistance is poor, for example, when processed into a tape. When the mixing ratio of polycaprolactone exceeds the above ratio, the mechanical properties of the tape at high temperatures become insufficient. Known fatty acid amides can be used. Among them, the products according to the present invention can be used in a wide variety of applications, so that they are highly safe and ethylene bisstearic acid registered with the FDA (US Food and Drug Administration). Amides, stearamides, oleamides, and erucamides are preferred. The fatty acid amide is added in an amount of 0.2 to 5 parts by weight, preferably 0.3 to 1.5 parts by weight, based on 100 parts by weight of the resin as the main polymer component. When the amount is less than 0.2 parts by weight, the anti-blocking effect is small. On the other hand, when the amount is more than 5 parts by weight, the slip of the tape becomes too large, and the printability and the adhesiveness are deteriorated. As the liquid lubricant, a liquid lubricant having a melting point of 70 ° C. or less, preferably a liquid at room temperature is used. As a liquid lubricant,
Paraffin wax; stearyl alcohol; stearic acid; and stearic esters such as butyl stearate, monoglyceride stearate, pentaerythritol tetrastearate, and stearyl stearate. The most desirable liquid paraffin as a liquid lubricant has an oral acute toxicity (rat) LD50 of 5 g / kg.
Therefore, it is very safe, is recognized as a food additive under the Food Sanitation Act, and is a very convenient material. When a liquid lubricant is mixed, the entire system including the resin can be used practically when the melting point of each solid lubricant is equal to or higher than the melting point of each of the solid lubricants described above, but desirably, liquid paraffin that is liquid at room temperature should be used. Is the best on the job. Polycaprolactone or aliphatic polyester resin as a main polymer component is usually supplied in the form of pellets or beads. When uniformly mixing fine powder silica or the like having a very small bulk specific gravity, the surface of the pellets or beads must be wet. The amount of liquid paraffin added as a wetting agent is in the range of 0.1 to 3 parts by weight, preferably 0.2 to 0.7 parts by weight, based on 100 parts by weight of the total amount of polycaprolactone and aliphatic polyester resin. Is added. If the amount exceeds 3 parts by weight, the inner surface of the tumbler becomes sticky, making it difficult to produce a stable product. The finely divided silica may be silica produced by a wet method or silica produced by high-temperature hydrolysis of silicon tetrachloride in an oxyhydrogen flame, but preferably has a particle size of 50 nm or less. It is heated and kneaded in a plastic polycaprolactone and an aliphatic polyester resin. At this time, a considerably high shearing force acts to loosen the secondary aggregated particles, thereby exhibiting an effect of preventing the tape of the product from blocking. The amount of the fine silica powder is 0.1 to 3 parts by weight based on 100 parts by weight of the resin. Starch can be added in an amount of 10 to 80 parts by weight, preferably 25 to 50 parts by weight, based on 100 parts by weight of the resin.

The biodegradable tape of the present invention can be obtained by molding a lactone-containing resin (c) or a lactone-containing resin composition (e) into a tape using a T-die extruder or the like, or into a film. The obtained film is cut into a tape,
Fibers or fiber bundles are obtained by weaving or knitting them to form a tape, or by arranging fibers and bonding them by fusion or the like to form a tape. The tape may be laminated with another biodegradable resin material or may be reinforced with fiber. The biodegradable tape may be uniaxially or biaxially stretched, may be provided with irregularities on one or both surfaces to provide an effect such as anti-slip, an adhesive layer on one or both surfaces, a release agent A layer and / or a heat sealing layer can also be provided. The tape of the present invention has a tape or string for packaging and packing, a part such as a stopper attached to the tape, for a band, an adhesive layer or a release layer on the surface, an adhesive tape for the surface, and a heat sealant on the surface. For heat sealing tape,
Other foams are laminated and used for gap tapes, other separators, cover tapes, packaging material tear tapes, displays, side tapes for diapers and sanitary products, and the like.

[0024]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples. In the Examples, “%” and “parts” are based on weight unless otherwise specified. Melt index is 190
It is the value at the time of 2,160 g weighting in ° C.

Example 1 Polycaprolactone (PCLH)
7 (manufactured by Daicel Chemical Industries, Ltd.)) 30 parts and poly 1, 4
-Butanediol-succinate (Bionole # 1
001 (manufactured by Showa Polymer Co., Ltd.) was placed in a twin screw type vented extruder (40 mm diameter), and extruded at a die temperature of 180 ° C. to obtain a lactone-containing resin pellet. The melt index of this lactone-containing resin was 2 g / 10 min. Using the prepared pellets, a tape was produced by a T-die extrusion method under the following molding conditions, and the physical properties of the tape were measured. Table 1 shows the results. Molding conditions Extruder: 40 mm diameter extruder Screw: L / D = 28, screw T die for MDPE (medium density polyethylene): width 50 mm, gap 3.
0 mm Extrusion temperature: 170 ° C. at the end of the cylinder Die temperature: 170 ° C. Resin temperature (T1): 160 ° C. Screw rotation speed: 15 rpm Discharge rate: 15 kg / hr Vertical stretching ratio: 5 times

Example 2 30 parts of talc was added to 70 parts of a lactone-containing resin composed of 30 parts of polycaprolactone and 70 parts of poly 1,4-butanediol-succinate used in Example 1 to give 2 parts. Put into a screw type vented extruder (40 mm diameter), die temperature 180
Extruded at ℃ to obtain pellets of the lactone-containing resin composition. Using the prepared pellets, a tape was produced by a T-die extrusion method under the same molding conditions as in Example 1, and the physical properties of the tape were measured. Table 1 shows the results.

Comparative Example 1 A tape was produced by using a T-die extrusion method under the same molding conditions as in Example 1 using polypropylene pellets. Using the prepared pellets, a tape was produced by a T-die extrusion method under the same molding conditions as in Example 1,
The physical properties of the tape were measured. Table 1 shows the results.

[0028]

[Table 1]

As a result, a tape equal to or higher than that of a conventional polypropylene packaging / wrapping tape was obtained. The tapes of Examples 1 and 2 and Comparative Example 1 were subjected to a biodegradability test by the following method. As a result, about 75% of the tapes of Examples 1 and 2 were decomposed by activated sludge in 28 days. The tape of Comparative Example 1 did not decompose at all. Biodegradability test method: The tape obtained above was pulverized and crushed in an urban sewage sludge environment according to JIS K6950.
It was subjected to an 8-day biodegradability test.

[0030]

According to the present invention, the moldability, physical properties at the time of use, decomposability after disposal, etc. are balanced.
A biodegradable tape was obtained.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 3/00 C08K 3/00 5/00 5/00 C08L 1/00 C08L 1/00 1/02 1/02 1/08 1/08 3 / 02 3/02 29/04 29/04 Z 67/02 67/02 77/04 77/04 89/00 89/00 C09J 7/02 C09J 7/02 Z

Claims (15)

[Claims] 1. A lactone-containing resin (c) comprising a lactone resin (a) alone or a lactone resin (a) and another biodegradable resin (b), or a lactone-containing resin (c) and a resin additive ( A biodegradable tape obtained by molding the lactone-containing resin composition (e) comprising d). 2. The lactone resin (a) is composed of various methylated caprolactones such as ε-caprolactone, 4-methylcaprolactone, 3,5,5-trimethylcaprolactone, and 3,3,5-trimethylcaprolactone, and β-propiolactone. , Γ-butyrolactone, δ-valerolactone, a homopolymer of enantholactone, a copolymer of two or more of these monomers, or a mixture of these homopolymers or copolymers. . 3. The biodegradable tape according to claim 1, wherein the other biodegradable resin is a synthetic and / or natural polymer. 4. The biodegradable tape according to claim 3, wherein the synthetic polymer comprises an aliphatic polyester, a biodegradable cellulose ester, a polypeptide, a polyvinyl alcohol, or a mixture thereof. 5. The natural polymer is starch, cellulose, paper,
The biodegradable tape according to claim 3, comprising pulp, cotton, carrageenan, chitin / chitosan, natural linear polyester resin, or a mixture thereof. 6. The resin additive is a plasticizer, a heat stabilizer, a lubricant,
The biodegradable product according to any one of claims 1 to 5, which is an antioxidant, an ultraviolet stabilizer, an antistatic agent, a flame retardant, a dropping agent, an antibacterial agent, a deodorant, a filler, a colorant, or a mixture thereof. tape. 7. A composition comprising 10 to 80% by weight of a lactone resin and 90 to 20% by weight of an aliphatic polyester (the total of the lactone resin and the aliphatic polyester is 100% by weight).
7. The biodegradable tape according to any one of to 6. 8. The lactone resin is poly-ε-caprolactone, and the aliphatic polyester is succinic acid / 1,4-butanediol polyester, succinic acid / ethylene glycol polyester, or succinic acid / adipic acid / 1,4.
The biodegradable tape according to claim 7, which is -butanediol copolyester. 9. The biodegradable tape according to claim 8, comprising a total of 100 parts by weight of polycaprolactone and aliphatic polyester and 10 to 50 parts by weight of talc. 10. The method according to claim 1, which is reinforced with biodegradable fibers.
10. The biodegradable tape according to any one of 9. 11. The film according to claim 1, which is uniaxially or biaxially stretched.
0. The biodegradable tape according to any one of 0. 12. The biodegradable tape according to claim 1, which has irregularities on one or both surfaces. 13. A packaging / packaging tape comprising the biodegradable tape according to claim 1. 14. The method according to claim 1, wherein at least one of an adhesive layer, a release agent layer and a heat seal layer is provided on one or both surfaces.
13. The biodegradable tape according to any one of items 12 to 12. 15. An adhesive tape comprising the biodegradable tape according to claim 14.