KR101116668B1 - An aliphatic polyester coating sheet and its manufacturing process - Google Patents

Abstract

PURPOSE: An aliphatic polyester coating sheet is provided to improve adhesion between polymer material and a paper, and the processing rate of coating papers by spreading a water-dispersing type primer on paper material in advance. CONSTITUTION: An aliphatic polyester coating sheet comprises paper material(3), a water-dispersed type primer(2), and a coating resin consisting of an aliphatic polyester resin(1). The water-dispersed type primer comprises polyvinylacetate copolymer. The coating resin consisting of an aliphatic polyester resin comprises 50-100 weight% of poly lactic acid(PLA), and 0-50 weight% of aliphatic polyester selected from polybutylenesuccinate, polycaprolactone, a polybutyleneadipate/terephthalate copolymer, polyhydroxylalkylrate, or polyhydroxybutyrate. The manufacturing method of the polyester coating sheet comprises a step of spreading the water-dispersed type primer with the amount of 1-20 g/m^2 and the movement speed of 10-120 m/minute on one side or both sides of paper material by using a gravure roll.

Description

Aliphatic polyester coated paper and its manufacturing method {AN ALIPHATIC POLYESTER COATING SHEET AND ITS MANUFACTURING PROCESS}

The present invention relates to an aliphatic polyester coated paper having improved adhesion to a coated resin and a method for manufacturing the same, and more particularly, to a paper substrate and a coating by applying a water-dispersible primer in advance before melt extrusion of the aliphatic polyester resin onto a paper substrate. It improves the adhesive strength between resins, and maintains a strong bonding strength even when the thickness of the coating resin is thinned, and can increase the processing speed of the coated paper to improve the productivity of the product. The aliphatic polyester coated paper prepared by the above method is harmless to humans, biodegradable even when disposed of, and the price competitiveness is excellent, so it is environmentally friendly aliphatic polyester coated paper that can be applied to various paper products such as various disposable products and wrapping paper, and its manufacture. It is about a method.

As is well known, synthetic resins have applications as plastic articles, including films, sheets, fibers, foams, molded articles, adhesives, coatings, and various forms of use, as well as articles bonded to other materials, most of which are solid wastes. Is terminated. Although such plastic wastes have been steadily being recycled, different grades of chemically similar plastics that are mixed during collection are degraded due to repeated processing of pure polymers, resulting in poor mechanical properties. It may cause low or processing problems.

For this reason, products including plastic coatings are required to be biodegradable, but articles such as various food containers or wrapping papers are mainly formed of laminates of plastics or foils, and the laminates contain mostly non-biodegradable materials. As a result, it is deposited in landfills, causing environmental problems. In addition, even if biodegradable, paper products such as printing paper require a gloss coating having grease and water resistance, and thus coatings which still provide a gloss finish on biodegradable paper are used. .

On the other hand, unlike non-degradable synthetic resin, aliphatic polyester, a biodegradable polymer, has the property of being biodegraded by microorganisms when buried. Among the aliphatic polyesters, polylactic acid (PLA) is the most environmentally friendly polymer because it is not only biodegradable but also produced in plants. For this reason, various researches on environmentally friendly polymers have been conducted, and among them, many studies have been made in the disposable paper containers and packaging parts. However, the aliphatic polyester has poor processability and adhesion, and in particular, the continuous production of the coated product is not easy.

In order to remedy this drawback, US Pat. No. 6,813,814 (Registration Date: Nov. 09, 2004) developed a melt coating method and a composition of a biodegradable resin, polylactic acid, but the invention has improved processability during melt coating, Adhesion is not sufficiently improved, and the final product has problems of stability and odor generation due to peroxide added during processing.

In addition, the Republic of Korea Patent No. 10-0875104 (Registration Date: 2008. 12. 15) is a biodegradable coating paper prepared by coating a biodegradable biodegradable resin composition on the paper surface or both sides under a predetermined condition, disposable food containers 10-75% polylactic acid, 10-75% biodegradable polyester resin, for use on coated paper that is free of environmental hormones, harmless to humans, and no environmental pollution when used as a paper cup, cup noodle container, disposable tray, etc. A biodegradable resin composition for laminating coatings is disclosed in a feeder to which 10-30% of biodegradable polyester urethane for physical property reinforcement, 0.05-1% of a plasticizer, 0.05-1% of a compatibilizer, and a filler are added. However, in the prior art, although the adhesive strength is slightly improved due to the improvement of the processing conditions, the product is not constant, and when the processing speed is increased, the adhesive strength with the paper is significantly reduced, and it has been investigated that there is a problem that peeling occurs during post-processing.

And in the Republic of Korea Patent No. 10-0939046 (Registration Date: 2010. 01. 20), the cardboard product having a coating thereon comprises at least one hollow-core binder of the first polymer containing at least one void, wherein the first polymer Has a coating formed from an ethylenically unsaturated monomer encapsulated by a second polymer. However, this has the effect of enabling a high gloss cardboard coating, but the problem that the workability for the paper substrate is significantly reduced.

In addition, the Republic of Korea Patent Publication No. 2003-0025930 (published: March 29, 2003) relates to a substrate having a coating comprising a biodegradable polyhydroxyalkanoate copolymer, which is easy to process, aerobic and Coatings are known which can improve the water and oil resistance of papers and fabrics and impart gloss on paper using polymers that will be biodegradable under anaerobic conditions, but are polyhydroxyalkano produced by the metabolism of the microorganisms. Eight copolymer is not yet produced universally, there is still a problem that is not suitable for the use of packaging, such as poor workability and expensive.

Accordingly, the present invention is to apply a water-dispersible primer to melt the extrusion of the aliphatic polyester on the paper substrate to improve the adhesion between the paper substrate and the aliphatic polyester to enhance the strength of the coated paper to improve the processing speed and product productivity With this in mind, the present invention has been completed.

It is an object of the present invention to improve the productivity of the product by enhancing the adhesion between the polymeric material and the paper to be coated and increasing the processing speed of the coated paper by pre-coating a water-dispersible lowering agent having excellent compatibility with the aliphatic polyester resin on the paper substrate It is to provide an aliphatic polyester coated paper and a method for producing the same that can be improved.

Another object of the present invention is to produce a coated paper that maintains strong adhesion even when the coating thickness of the aliphatic polyester on a paper substrate is continuously produced by aliphatic polyester coated paper that does not occur between the layers even when the coated paper is post-processed And to provide a method for producing the same.

Aliphatic polyester coated paper of the present invention, a paper substrate; Water dispersible primers made of polyvinyl acetate copolymers; 50-100% by weight of polylactic acid (PLA) and polybutylene succinate, polycaprolactone, polybutylene adipate / terephthalate copolymer, polyhydroxyalkylate, polyhydroxybutyrate Coating resin made of aliphatic polyester resin consisting of 0 to 50% by weight of the aliphatic polyester selected above; including, and is applied to one or both sides of the paper substrate in order of water-dispersible primer, coating resin It is characterized by.

The polyvinyl acetate copolymer is a polyvinylacetate / acrylate copolymer emulsion composition or monomer content ratio of 10 to 90% by weight of vinyl acetate and 10 to 90% by weight of acrylate and 50 to 80% by weight of vinyl acetate Polyvinylacetate / ethylene copolymer emulsion composition composed of 20 to 50% by weight of ethylene, the coating amount of the water-dispersible primer is characterized in that 1 ~ 20 g / m ² , the coating resin of the aliphatic polyester resin The thickness is characterized in that 0.01 ~ 3mm.

In addition, the coating resin of the aliphatic polyester resin may further include 1 to 80 parts by weight of a plasticizer with respect to 100 parts by weight of the aliphatic polyester resin, the paper base material is white paper, kraft paper, wrapping paper, corrugated paper, white paper, nonwoven fabric and It consists of any 1 or more types of products manufactured from these.

And in the method for producing an aliphatic polyester coated paper of the present invention, using a gravure roll on one side or both sides of the paper substrate is coated with a water-dispersible bottom coating agent of polyvinylacetate copolymer, the transfer speed of the paper substrate is 10 ~ 120 m Per minute, the coating amount of the primer is 1 to 20 g / m ² The first step of applying a water-dispersible primer; A second step of drying the water of the water-dispersing primer, using a heating chamber and a heating roller, on which the paper base material coated with the polyvinylacetate copolymer is coated at a temperature of 80-200 ° C .; A third step of melt extruding the aliphatic polyester resin at a temperature of 150 to 230 ° C. on one or both sides of the paper substrate to which the water-dispersing primer is made of the polyvinyl acetate copolymer; It characterized in that it comprises a fourth step of winding the coated paper coated with the aliphatic polyester resin continuously.

The present invention ensures uniform and strong adhesion between the paper substrate and the aliphatic polyester resin by applying a water-dispersible lowering agent of polyvinylacetate copolymer to the paper substrate, and also continuously aliphatic immediately upon application and drying of the primer. Since the polyester resin is manufactured by extrusion coating, it is possible to improve the production speed, reduce the process defects, and produce products with price competitiveness due to the reduction of the processing cost. There is no effect that the productivity is improved.

In addition, since the aliphatic polyester coated paper prepared by the present invention is coated with a water-dispersible lowering agent made of polyvinylacetate copolymer and an aliphatic polyester resin on one side or both sides of the paper in turn, the adhesive strength to the paper substrate is very excellent. Existing non-degradable disposable products and paper products in various fields, such as wrapping paper can be replaced, and as a coating paper having a stronger adhesive force and biodegradability than the conventional has the effect that can be safely used as a coating paper harmless to the human body and environmentally friendly.

1 is a cross-sectional view showing the structure of a single-sided aliphatic polyester coated paper according to the present invention.
2 is a cross-sectional view showing the structure of a double-sided aliphatic polyester coated paper according to the present invention.
Figure 3 is a block diagram showing the procedure for producing an aliphatic polyester coated paper according to the present invention.

Hereinafter will be described with respect to the aliphatic polyester coated paper according to the present invention with reference to the drawings, which is intended to illustrate to the extent that it can be easily carried out self-invention having ordinary skill in the art to which the present invention belongs, This does not mean that the technical spirit and scope of the present invention is limited.

As shown in Figure 3, the method for producing an aliphatic polyester coated paper according to the present invention comprises a first step to a fourth step.

The first step is to apply a water-dispersible undercoat made of polyvinylacetate copolymer to one or both sides of the paper substrate using gravure roll, and the applied undercoat is coated on the paper substrate and the coating resin in its molecular structure. Good compatibility with, enhances the adhesive strength and improves productivity by shortening the processing time. In addition, by maintaining the adhesive strength of the coating surface can be prevented in advance peeling phenomenon that may occur during the post-processing.

Polyvinylacetate copolymer used in the present invention includes a polyvinylacetate / ethylene copolymer emulsion, polyvinylacetate / acrylate copolymer emulsion, etc., the copolymer emulsion is an emulsion of copolymerization of ethylene or acrylate to vinyl acetate It is a material that is almost harmless to the environment that can be used as an adhesive for wood, papermaking, nonwoven binder, resin processing agent by providing excellent adhesive strength, water resistance, elongation and the like. The polyvinyl acetate / acrylate polymer emulsion is a composition having a monomer content ratio of 10 to 90% by weight of vinyl acetate and 10 to 90% by weight of acrylate, the polyvinylacetate / ethylene polymer emulsion is a vinyl acetate 50 ~ A composition having a composition ratio of 80% by weight and 20-50% by weight of ethylene.

The viscosity of the water-dispersible undercoat made of the polyvinylacetate copolymer composed of the above components is maintained at 2000 cps or less, and is suitable for application, and does not cause problems with impregnation with the paper substrate and adhesion.

As described above, the present invention is applied continuously using gravure roll of 75 ~ 225 neck according to the application amount of the water-dispersible primer of polyvinylacetate copolymer on one or both sides of the paper substrate, wherein the transfer speed of the paper substrate 10 to 120 m / min, the coating amount of the primer is set to 1 to 20 g / m ² It is preferable that the coating of the water-dispersible primer is applied uniformly, more preferably 4 to 8 g / m ² When applied to, it was studied to be sufficient to maintain a strong adhesion between the paper substrate and the aliphatic polyester resin.

The second step process is to dry the water of the water-dispersible primer, using a heating chamber and a heating roller is set to a temperature of 80 ~ 200 ℃ the paper substrate coated with the polyvinylacetate copolymer, If moisture remains on the paper substrate, the drying ability of the heating chamber and the heating roller (drying efficiency, residence time) may weaken the adhesion between the paper substrate and the coating resin and cause deformation of the paper substrate, which may cause unwanted problems during post-processing. It is very important to ensure uniform temperature conditions.

In the third step, the aliphatic polyester resin is melt-extruded at a temperature of 150 to 230 ° C. on one or both surfaces of the paper substrate to which the water-dispersing primer is made of the polyvinylacetate copolymer. By winding the coated paper coated with the aliphatic polyester resin, the winding of the coating surface to the outside during the winding may minimize the curling phenomenon of the coated paper.

In general, aliphatic polyester resins are known to belong to fully biodegradable plastics and are the main materials for producing daily necessities and medical supplies. In other words, while the demand for aliphatic polyesters for daily necessities such as improvement of people's living standards, health, and environmental protection is increasing, general aliphatic polyesters have limitations in manufacturing or use that physical properties such as heat deformation temperature and transportation humidity are rather weak. have.

For reference, plastics are decomposed in the natural environment for a few hundred years and generally hardly decomposed, so they are not only restricted in use, but are also recognized as one of the main causes of environmental pollution. Therefore, the demand for new materials that are easily decomposed in the natural environment and does not cause environmental pollution problems has increased, and 'biodegradable plastic' is emerging. Biodegradable plastics are usually made from starch or aliphatic polyester. Starch is made by adding corn or potato, and 'aliphatic polyester' is a biodegradable 'aromatic polyester (used mainly in clothing)' that replaces the benzene ring with hydrocarbons in its natural structure. Making it fully biodegradable. Starch products are inexpensive and degradable but have a weak strength. On the other hand, aliphatic polyester has a high price, but has been in the spotlight recently because of its superior strength and processability.

In the present invention, aliphatic polyester is used as the coating resin, and among them, the most competitive in price, and polylactic acid (PLA), which is a plant-derived biodegradable polymer, is used as a main component. However, in order to improve the brittleness of polylactic acid according to the use of coated paper, a polymer composition containing other aliphatic polyester may be prepared and coated on a paper substrate.

The other aliphatic polyester added to the polylactic acid in the present invention is any one or more of polybutylene succinate, polycaprolactone, polybutylene adipate / terephthalate copolymer, polyhydroxyalkylate, polyhydroxybutylate It is included within 50% by weight based on the total weight of the coating resin. At this time, the moisture content of the raw materials must be dehumidified and dried to 100ppm or less before mixing, and it is important to prevent the thermal decomposition of the biodegradable resin at a processing temperature of 150 to 230 ° C.

In addition, the coating resin further contains 1 to 80 parts by weight of plasticizer based on 100 parts by weight of the aliphatic polyester resin to be better in terms of elasticity, strength, heat resistance, cold resistance, flame resistance, electrical properties, moldability and processability of the coated paper. Although the plasticizer is not particularly limited in its components, the plasticizer may be a type compatible with the coating resin, and specifically, ethoxycarbonyl methyl dioctyl citrate, butoxycarbonyl methyl dimethyl citrate, and butoxycarb Carbonyl methyl diethyl citrate, butoxycarbonyl methyl dibutyl citrate, dimethoxycarbonyl methyl monomethyl citrate, dimethoxycarbonyl methyl monoethyl citrate, dimethoxycarbonyl methyl monobutyl citrate, diethoxycarbon Carbonyl Methyl Monomethyl Citrate, Methoxycarbonyl Methyl Dimethyl Citrate , Methoxycarbonyl methyl diethyl citrate, methoxycarbonyl methyl dibutyl citrate, ethoxycarbonyl methyl dimethyl citrate, ethoxycarbonyl methyl dibutyl citrate, diethoxycarbonyl methyl monobutyl citrate At least one ester compound selected from the group consisting of dibutoxycarbonyl methyl monoethyl citrate, dibutoxycarbonyl methyl monobutyl citrate, phthalate compounds, epoxidized oils, epoxidized esters or mixtures thereof It is desirable to.

In other words, in the present invention, the method of adhering the coating resin of the paper substrate and the aliphatic polyester resin is an extrusion coating method, the optimum temperature of the molten coating resin is 150 ~ 230 ℃ and the coating thickness is 0.01 ~ 3.0㎜, processing A linear speed of 40 to 80 m / min is appropriate. And it is preferable to set the gap between the die and the cooling roll within 10cm to strengthen the adhesion between the paper substrate and the coating resin coated with the primer, and to minimize the curling phenomenon of the coated paper, the winding is a coating surface of the coated paper It is good to wind it outward.

As described above, the present invention has been completed through numerous experiments. Hereinafter, the present invention will be described through preferred embodiments to be easily understood and implemented by those skilled in the art.

≪ Example 1 >

180 pyeong of white paper for food was used as a paper substrate, and 150 vinyl gravure roll was applied to the paper substrate as a polyvinylacetate (70 wt%) / ethylene (30 wt%) copolymer emulsion as a primer. , Dried by passing through a heating chamber of 120 ℃ at a rate of 60 m / min and further drying using a heating roller. The coating resin was melt-extruded 100 wt% polylactic acid through a T-die at 230 ° C., and the extrusion rotation speed was 15 rpm to prepare an aliphatic polyester coated paper having a coating thickness of 20 μm.

<Example 2>

A coating paper was prepared in the same manner as in Example 1, except that the coating resin was blended in a ratio of 80 wt% polylactic acid and 20 wt% polybutylene succinate.

<Example 3>

A coated paper was prepared in the same manner as in Example 1 except that a polyvinylacetate (50 wt%) / acrylate (50 wt%) copolymer emulsion was applied as a primer to the paper substrate.

<Example 4>

Polyvinylacetate (50% by weight) / acrylate (50% by weight) copolymer emulsion was applied to the paper substrate as a coating agent, and then 80% by weight of polylactic acid and 20% by weight of polybutylene succinate were coated with a coating resin. Coated paper was prepared in the same manner as in Example 1 except for using the blended composition.

Comparative Example 1

A coated paper was prepared in the same manner as in Example 1 except that no primer was applied to the paper substrate.

Comparative Example 2

A coated paper was prepared in the same manner as in Example 2, except that no primer was applied to the paper substrate.

Experimental Example 1

Peel strength was measured according to the Korean Industrial Standard KS M 3725. The sample size was 1cm in width and 5cm in length, and the adhesion strength of the paper and the coated resin was confirmed without moisture absorption at room temperature, and the peeled paper and the coated resin were subjected to 10 samples for each Example and Comparative Example. The state was observed and the results are shown in the following [Table 1].

division
materials
Water dispersible primer
Coated Resin
materials
Destruction
adhesion
compatibility
Example 1
Woodfree paper for food
(180 basis weight)
Polyvinylacetate (70%) /
Ethylene (30%)

Polylactic Acid (100%)
10
○
Example 2
〃
Polyvinylacetate (70%) /
Ethylene (30%)
Polylactic Acid (80%) / Polybutylene Succinate (20%
)
10
○
Example 3

〃
Polyvinylacetate (50%) /
Acrylate (50%)

Polylactic Acid (100%)
10
○
Example 4
〃
Polyvinylacetate (50%) /
Acrylate (50%)
Polylactic Acid (80%) / Polybutylene Succinate (20%)

10
○
Comparative Example 1

〃
-
Polylactic Acid (100%)
0
×
Comparative Example 2
〃
-
Polylactic Acid (80%) / Polybutylene Succinate (20%)

0
×

※ Evaluation standard

(Circle): 9 or more base materials destroyed

(Triangle | delta): 5-8 base material destruction

×: 0 to 4 substrate destruction

Example 5

Kraft paper of 90 pyeong was used as a paper substrate, and a polyvinylacetate (70% by weight) / ethylene (30% by weight) copolymer emulsion was used as a coating agent using 150 gravure rolls on the paper substrate. Moisture was dried through a heating chamber at 120 ° C. at a rate of m / min and further dried using a heating roller. The coating resin was melt-extruded 100 wt% polylactic acid through a T-die at 230 ° C., and the extrusion rotation speed was 15 rpm to prepare an aliphatic polyester coated paper having a coating thickness of 20 μm.

<Example 6>

A coated paper was prepared in the same manner as in Example 5, except that the composition blended at a ratio of 80 wt% polylactic acid and 20 wt% polybutylene succinate was used as the coating resin.

<Example 7>

A coated paper was prepared in the same manner as in Example 5 except that the polyvinylacetate (50% by weight) / acrylate (50% by weight) copolymer emulsion was applied to the paper substrate as a primer.

<Example 8>

Polyvinylacetate (50% by weight) / acrylate (50% by weight) copolymer emulsion was applied to the paper substrate as a coating agent, and then 80% by weight of polylactic acid and 20% by weight of polybutylene succinate were coated with a coating resin. Coated paper was prepared in the same manner as in Example 5, except that the composition blended thereto was used.

Comparative Example 3

A coated paper was prepared in the same manner as in Example 5 except that no primer was applied to the paper substrate.

<Comparative Example 4>

A coated paper was prepared in the same manner as in Example 6 except that no primer was applied to the paper substrate.

Experimental Example 2

Adhesive strength evaluation method and evaluation criteria are the same as in Experimental Example 1, the results are shown in Table 2 below.

division

materials
Water dispersible primer
Coated Resin
materials
Destruction
adhesion
compatibility
Example 5
Kraft paper
(90 pyeong)

Polyvinylacetate (70%) /
Ethylene (30%)
Polylactic Acid (100%)
10
○
Example 6
〃
Polyvinylacetate (70%) /
Ethylene (30%)

Polylactic Acid (80%) / Polybutylene Succinate (20%)
10
○
Example 7
〃
Polyvinylacetate (50%) /
Acrylate (50%)

Polylactic Acid (100%)
10
○

Example 8
〃
Polyvinylacetate (50%) /
Acrylate (50%)

Polylactic Acid (80%) / Polybutylene Succinate (20%)
10
○
Comparative Example 3

〃
-
Polylactic Acid (100%)
0
×
Comparative Example 4
〃
-
Polylactic Acid (80%) / Polybutylene Succinate (20%)

0
×

As shown in [Table 1] and [Table 2], Comparative Examples 1 to 4 have weak interfacial adhesion between the paper substrate and the coating resin, so that peeling easily occurs, while all of the aliphatic polyester coated papers prepared according to the present invention are aliphatic poly It was confirmed that even when the coating thickness of the ester resin was thin, the adhesive had sufficient adhesive strength to destroy the paper substrate, and the physical properties such as the adhesive strength between the paper substrate and the aliphatic polyester resin were remarkably improved to improve the processing speed as well as the post processing. Even though the delamination does not occur, the productivity of the final product can be improved.

Therefore, the aliphatic polyester coated paper of the present invention can be used in various uses and forms as an environmentally friendly material that can be applied to biodegradable paper products such as various disposable products and wrapping papers without departing from the technical spirit of the present invention.

1: aliphatic polyester resin or composition thereof 2: water-dispersible primer
3: paper base material 4: rewinder
5: gravure roll 6: heating chamber
7: Heat roller 8: Ti die dies
9: compression roll 10: cooling roll
11: winder

Claims (10)

Paper substrates;
Water dispersible primers made of polyvinyl acetate copolymers;
50-100% by weight of polylactic acid (PLA) and polybutylene succinate, polycaprolactone, polybutylene adipate / terephthalate copolymer, polyhydroxyalkylate, polyhydroxybutyrate It includes; coating resin made of aliphatic polyester resin composed of 0 to 50% by weight of aliphatic polyester selected above
Aliphatic polyester coated paper, characterized in that the coating is made by applying one or both surfaces of the paper substrate in order of water-dispersible primer, coating resin. The method of claim 1,
The polyvinyl acetate copolymer is an aliphatic polyester coated paper, characterized in that the monomer content ratio of polyvinylacetate / acrylate copolymer emulsion composition consisting of 10 to 90% by weight of vinyl acetate and 10 to 90% by weight of acrylate. The method of claim 1,
The polyvinyl acetate copolymer is an aliphatic polyester coated paper, characterized in that the monomer content ratio of polyvinylacetate / ethylene copolymer emulsion composition consisting of 50 to 80% by weight of vinyl acetate and 20 to 50% by weight of ethylene. 4. The method according to any one of claims 1 to 3,
Aliphatic polyester coated paper, characterized in that the coating amount of the water-dispersible undercoat of the polyvinyl acetate copolymer is 1 ~ 20 g / m ² . delete 4. The method according to any one of claims 1 to 3,
The thickness of the coating resin of the aliphatic polyester resin is an aliphatic polyester coated paper, characterized in that 0.01 ~ 3mm. The method according to any one of claims 1 to 3,
The coating resin of the aliphatic polyester resin is an aliphatic polyester coating paper, characterized in that it further comprises 1 to 80 parts by weight of a plasticizer based on 100 parts by weight of aliphatic polyester resin. The method of claim 7, wherein
The plasticizer is ethoxycarbonyl methyl dioctyl citrate, butoxycarbonyl methyl dimethyl citrate, butoxycarbonyl methyl diethyl citrate, butoxycarbonyl methyl dibutyl citrate, dimethoxycarbonyl methyl monomethyl sheet Rate, dimethoxycarbonyl methyl monoethyl citrate, dimethoxycarbonyl methyl monobutyl citrate, diethoxycarbonyl methyl monomethyl citrate, methoxycarbonyl methyl dimethyl citrate, methoxycarbonyl methyl diethyl citrate , Methoxycarbonyl methyl dibutyl citrate, ethoxycarbonyl methyl dimethyl citrate, ethoxycarbonyl methyl dibutyl citrate, diethoxycarbonyl methyl monobutyl citrate, dibutoxycarbonyl methyl monoethyl citrate, Dibutoxycarbonyl methyl monobutyl citrate, phthalate compound, epoxidation An aliphatic polyester coated paper comprising any one or more ester compounds selected from the group consisting of oils, epoxidized esters or mixtures thereof. The method of claim 1,
The paper substrate is an aliphatic polyester coated paper, characterized in that any one or more of woodfree paper, kraft paper, wrapping paper, corrugated paper, white paper, nonwoven fabrics and products made therefrom. In the continuous production of aliphatic polyester coated paper,
Using a gravure roll on one or both sides of the paper substrate, apply a water-dispersible type primer made of polyvinylacetate copolymer, but the paper substrate transfer speed is 10-120 m / min, the coating amount of the primer is 1 ~ 20 g / a first step of applying a water-dispersible primer as m ² ;
A second step of drying the water of the water-dispersing primer, using a heating chamber and a heating roller, on which the paper base material coated with the polyvinylacetate copolymer is coated at a temperature of 80-200 ° C .;
A third step of melt extruding the coating resin made of an aliphatic polyester resin on one or both sides of the paper substrate to which the water-dispersible primer is made of the polyvinyl acetate copolymer at a temperature of 150 to 230 ° C .;
A fourth step of winding the coated paper to which the coated resin of the aliphatic polyester resin is applied;
Method for producing an aliphatic polyester coated paper comprising a.

Images