WO2004031480A1

WO2004031480A1 - Recyclable moistureproof packaging paper

Info

Publication number: WO2004031480A1
Application number: PCT/JP2002/010293
Authority: WO
Inventors: Imam Mahfudzi; Lukmannul Hakim; Chandra Heriyanto; Ming Tsung Tsai
Original assignee: Pt. Pabrik Kertas Tjiwi Kimia Tbk.; Suzuki, Rikio
Priority date: 2002-10-02
Filing date: 2002-10-02
Publication date: 2004-04-15
Also published as: JPWO2004031480A1; AU2002368254A1; CN1685109A; CN100383338C; JP3966879B2; AU2002368254A8

Abstract

A recyclable moistureproof packaging paper for, e.g., copying papers for photographic printing which is obtained by coating a raw paper on one side with a moistureproof layer comprising or formed from the following ingredients (1) to (3): fine calcium carbonate particles, a thin polymer film which has been formed from an allyl acrylate emulsion and hydroxyethyl cellulose and with which the individual fine calcium carbonate particles are coated, and a synthetic rubber latex obtained from a conjugated diene compound and other compound(s) copolymerizable therewith. The moistureproof packaging paper is odorless. In particular, the moistureproof layer is almost equal in moisture resistance and water repellency to the polyethylene layer in polyethylene laminates.

Description

Recyclable moisture-proof wrapping paper

The invention of this application relates to a recyclable moisture-proof wrapping paper used for copying paper for photo printing and the like, and more particularly to a recycling method in which the moisture-proof layer has the same moisture-proof and water-repellent properties as a polyethylene laminate layer. A possible moisture-proof wrapping paper.

Ming background technology.

book

One of the major issues around the world these days is waste. Not all waste is environmentally friendly. Therefore, from the viewpoints of environmental pollution prevention and waste reduction, there is a demand for moisture-proof wrapping paper that can be recycled. Moisture-proof wrapping paper generally has a moisture-proof layer provided on one side of kraft paper, and polyethylene is often used as the moisture-proof layer because of its excellent moisture-proof performance.

In order to recycle moisture-proof wrapping paper, it is necessary that the pulp of the paper be sufficiently defibrated into single fibers and that the resulting pulp be low in other contaminants. Even if the pulp is removed from the polyethylene-laminated moisture-proof wrapping paper in the pulp treatment step to remove the pulp, it is very difficult to re-pulp or disperse the pulp in the state of stock pulp because the pulp does not sufficiently disintegrate. Polyethylene is mixed in the papermaking process. This is partly due to the fact that the good moisture-proof property and high water-repellency of polyethylene and the properties required for repulping and re-pulpting kraft paper are mutually exclusive.

Therefore, polyethylene-laminated moisture-proof wrapping paper is mostly treated as industrial waste. On the other hand, it is known that paraffin wax is used as a moisture-proof layer as recycled moisture-proof wrapping paper. This moisture-proof wrapping paper is easy to recycle when compared with polyethylene laminate wrapping paper. It has the drawback that it is easily transferred to the package and its moisture-proof property tends to decrease from the crease, so that it has not been put to practical use except for special uses. By the way, special quality is required for moisture-proof wrapping paper for photo printing paper. This is because photographic printing paper has a low water content (water content of about 4.5 to 5%), and this property is necessary in order to be able to print with high quality on photo printing machines. To keep the moisture content of photographic printing paper at about 4.5 to 5%, moisture-proof wrapping paper laminated with polyethylene having good moisture-proof properties and water-repellent properties has been used so far. However, as described above, moisture-proof wrapping paper laminated with polyethylene cannot be easily recycled, causing environmental problems. Since paraffin wax was transferred and the moisture-proof properties deteriorated from the folds, it could not be used as moisture-proof wrapping paper for photographic printing paper. As a solution to the above-mentioned problems of the moisture-proof wrapping paper, for example, Japanese Patent Application Laid-Open No. 9-120969 discloses a moisture-proof layer having a pigment having an aspect ratio of 5 or more and an average particle diameter of 5 or more. Talc or mica of 5 μπι to 50 μπι was used, and the filler and styrene-butadiene rubber latex (SBR) content ratio was 30:70 to 70:30 by weight. A moisture proof wrap is disclosed. Similarly, Japanese Patent Application Laid-Open No. 9-21094 discloses a moisture-proof composition formed by applying an aqueous emulsion composition comprising a synthetic rubber latex and a wax-based emulsion onto base paper and drying. Emulsion polymerization of a conjugated diene compound and a monomer composed of another compound copolymerizable with it in the presence of a neutralized product of a soluble polymer as a synthetic rubber latex in a moisture-proof paper having a layer The use of a synthetic rubber latex obtained by the above-mentioned method is described. Disclosure of the invention

However, the above-mentioned known moisture-proof wrapping paper has a high content of SBR, so a deinking step is required in the recycling process, and there is a problem that the paper is directly cut to make paper. Has the problem of becoming sticky due to its thermoplasticity, and was not suitable as a recyclable moisture-proof wrapping paper for photographic printing paper at all. The present inventors have conducted various studies to solve this problem, and as a result, as PCT / JP02 / 05937, the surface of each particle of calcium carbonate commonly used as a filler has been added to the surface. A patent application has been filed for a moisture-proof wrapping paper coated with a coating layer formed of a lilacacrylate emulsion and an ester polymer.

The recyclable moisture-proof wrapping paper according to the invention of the above-mentioned patent application (hereinafter, referred to as “the prior invention”) specifically has the following configuration.

(I) Recyclable moisture-proof wrapping paper characterized in that one side of the paper is coated with a moisture-proof layer containing at least the following components (1) to (3).

(1) calcium carbonate fine particles,

(2) a thin film formed from aryl acrylate emulsion and ester polymer, which coats the individual calcium carbonate fine particles,

(3) Synthetic rubber latets composed of other compounds copolymerizable with the conjugated diene compound.

(II) The main component of the fine particles of calcium carbonate is a particle having a particle size of 2 / im or less, and the fine particles of calcium carbonate are contained in the moisture-proof layer at a ratio of 40 to 60% by weight. ) A recyclable moisture-proof wrapping paper according to (1).

(III) The recyclable product according to (I) or (II), wherein the ester polymer is formed from acrylic acid and propylene dalicol. Moisture proof wrapping paper,

(IV) The polymer thin film that coats the individual calcium carbonate fine particles is a thin film composed of allylic acrylate copolymer and an ester polymer formed from acrylic acid and daricol, and aryl acrylate in the moisture-proof layer. 1 0-2 0 weight ^_0/0, recyclable moisture-proof wrapping paper according to 2 are Akuriru acid 5 wt% and propylene Dali Lumpur is contained in a proportion of 1-3 wt% (III).

(V) Styrene butadiene rubber latex as a synthetic rubber latex made of another compound copolymerizable with the conjugated diene compound in the moisture-proof layer is 20 to

40 weight. The recyclable moisture-proof wrapping paper according to any one of (I) to (IV), wherein the wrapping paper is contained at a ratio of / ₀ . According to the above-mentioned prior invention, the coating layer has the same moisture-proof and deep-water properties as the polyethylene laminate layer by adopting the above-mentioned configuration, but it does not separate only the pulp in the recycling process. Not only the pulp portion but also the moisture-proof layer components can be easily recycled, and excellent moisture-proof and water-recyclable recyclable moisture-proof wrapping paper can be obtained that can sufficiently protect photographic printing paper. It is.

The feature of the invention of the prior application is that the calcium carbonate particles do not themselves have a moisture-proof or water-repellent property, but are formed from aryl acrylate emulsion and acrylic acid and propylene daricol. By forming a coating layer made of an ester polymer, the calcium carbonate particles themselves are imparted with moisture resistance and water resistance. However, since the ester polymer formed from acrylic acid acrylate and acrylic acid and propylene dalicol in the above-mentioned prior invention has a slight odor, the use of the moisture-proof wrapping paper according to the above-mentioned invention makes it difficult for the packaged article to be used. There was a problem that the odor would adhere. Accordingly, the present inventors have conducted various searches for a coating layer which can impart moisture-proof and water-repellent properties to calcium carbonate particles having no odor and capable of achieving at least the same effects as those of the above-mentioned prior invention. When a coating layer composed of a polymer formed from rate emulsion and hydroxyethyl cellulose (HEC) is used, not only does it have no odor, but it also requires a less amount of coating as a moisture-proof layer than in the case of the above-mentioned prior application. They have found that the same effects can be achieved, and have completed the present invention. The present invention is characterized by being a recyclable moisture-proof wrapping paper in which one surface of the paper is coated with a moisture-proof layer containing at least the following components (1) to (3).

(1) Calcium carbonate fine particles

(2) A polymer thin film formed from arylacrylate emulsion and hydroxyethyl cellulose that coats the individual calcium carbonate fine particles.

(3) Synthetic rubber latex composed of another compound copolymerizable with a conjugated diene compound In the embodiment, the particle size of the calcium carbonate fine particles is preferably 2 μπι or less as a main component, and the content thereof Is 40 to 60 weight in the moisture barrier. / ₀ is preferably contained. If the particle size of the calcium carbonate fine particles is too large, the smoothness of the moisture-proof layer will be reduced, causing a decrease in moisture-proof properties.If the content of calcium carbonate fine particles is too large, the moisture-proof layer will be too strong. However, it may be torn when folded, causing a decrease in moisture resistance. Conversely, if the content of calcium carbonate fine particles is too small, the content of the synthetic rubber latex becomes too large, and it becomes difficult to obtain good paper when recycled. Polymer coating the calcium carbonate particles is Arirua moistureproof layer moisture barrier layer chestnut rates force S 1 0 to 2 5 weight ^_0/0, a non de Loki Chez Chino les cellulose 0.2 to 2 by weight. / ₀ is preferably contained. Within this range, the calcium carbonate fine particles can be imparted with good moisture-proof properties and water resistance. Further, to coat the calcium carbonate fine particles with the polymer thin film, the calcium carbonate fine particles are charged into the aqueous emulsion solution of the aryl acrylate and the hydroxyxethyl cellulose, and the mixture is sufficiently stirred and mixed. It can be produced by separating and drying.

As a binder for binding the polymer-coated calcium carbonate fine particles to each other, a synthetic rubber latex made of another compound copolymerizable with a conjugated gen compound is used. As the conjugated diene compound, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and the like can be used, and 1,3-butadiene is particularly preferred. As the other compound copolymerizable with the conjugated diene compound, an aromatic vinyl compound such as styrene, methylstyrene and butyltoluene can be used, but styrene is particularly preferable.

The most preferred synthetic rubber latex used in the present invention is styrene-butadiene rubber latex (SBR) conventionally used in coated papers and the like. This synthetic rubber latex is preferably 20 to 40% by weight in the moisture-proof layer. Used at a rate of / ₀ . The moisture-proof wrapping paper of the present invention is produced by coating a base paper with an aqueous emulsion composition containing polymer-coated calcium carbonate fine particles and a synthetic rubber latex, followed by drying. Manufacturing process is performed by using a blade coater or air knife coaters, the coating weight on the back side of the base paper ^{1 5~ 3 0 g / m 2} ( dry weight conversion calculation) and water content from 3.0 to 4.5 wt% Coated with. If the amount of coating is less than 15 _g / m ² , the base paper is insufficiently coated, resulting in pinholes and insufficient moisture-proof effect. On the other hand, if the coating amount exceeds 35 g Zm ² , the folds are apt to be broken, and the moisture resistance deteriorates therefrom, which is not preferable.

The moisture-proof wrapping paper using the polymer-coated calcium carbonate of the present invention is easily dispersed in a mixer or pulp, like a coated paper. As a result, the moisture-proof wrapping paper of the present invention is completely redispersed in fibers and coating materials after being repulped or mixed, the coating material is crushed after the mixing process, and the fine coating It functions as a filler in a paper machine because it is dispersed as a bulk material. Therefore, high quality paper can be obtained even if recycled. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, specific examples of the present invention will be described with reference to examples. In order to measure the quality of wrapping paper suitable for photographic printing paper, the present inventors adopted the following four kinds of standard test methods. -a. WVTR (moisture permeability)

The water vapor permeation rate was determined by measuring the weight of water vapor permeating the sheet material under the conditions described in the following standards, and converting the water vapor permeation amount to g / 24 hr Zm ² . The standards used for the method of measuring the moisture permeability are as follows.

1. Japan TAP PI Test Method for Pulp and Paper No. 7

2. TAP P I test method, 1998-1999 edition, No. T 448 o m-97, Τ 464 o m-95, T465 sp-95 b. Recyclability test by high-speed mixer

The test method for recyclability is as follows.

1. Cut the paper into 3 x 3 cm and collect a weight of 22.5 g.

2. Put the cut paper into a high-speed mixer and add 150 Om1 of water.

3. Mix for 30 minutes using a high-speed mixer.

4. Remove the mixed paper and make it to 60 g / m ² in a manual paper machine.

5. Observe the completed paper for flocks.

6. If the obtained paper has no floc, recyclability is guaranteed. c. Adhesion resistance test

The test method for tack resistance is as follows.

1. Cut the test paper to 3.1 x 3.1 cm. 2. Prepare the photo print paper, and place the cut test paper on the photo print paper with the moisture-proof coating layer side.

3. Place 3 x 3 cm rubber on test paper. The thickness of the rubber is arbitrary, unless it is too thick.

4. Prepare an oven and raise the temperature to 40 ± 1 ° C.

5. Place a stack of photo print paper, test paper and rubber in the oven and place a 5 kg weight.

6. After 48 hours in the oven, remove the rubber and remove the photo print paper bundle and test paper. Investigate how sticky the test paper is when it is removed from the photo paper.

7. When the test paper is peeled off from the photo printing paper, the surface is not peeled off at all, and if both surfaces have almost no scratches, good quality is maintained. d. Bending test

The bending test method is the same as the method for measuring the water vapor transmission rate in Test No. 1 except that the test paper is folded in two before the test.

(Example 1)

In this example, commercially available calcium carbonate fine particles (TKF-65, trade name, manufactured by Tjiwi Kimia Co., Ltd.) in which 65% of particles having a particle size of 2 zm or less account for 65% of the calcium carbonate fine particles were used. Allyl Atarilate (made by CIBA)

INTEMEDIATE2003, trade name) Pour into a water-based emulsion solution of a polymer consisting of emulsion and hydroxechinocellulose (HEC), stir well, mix, separate, dry, and dry to form a polymer film on the surface of calcium carbonate fine particles. Was formed.

Styrene butadiene rubber latex (SBR) as a polymer-coated carbonic acid rubber and a binder is dispersed in water to form a coating solution, and high-quality paper is used as a base paper to obtain a dry weight of 18 g / m ^2. Coated on one side, dried and dampproof wrapping paper It was created. The content of each composition in the moisture-proof layer is as follows in terms of solid content. The contents shown below all represent% by weight. Carbonate carbonate 54.3 0%

Arylak Relate Emulsion: 16.0 0%

Hydroxyshetyl cellulose (HEC): 0.80%

SBR latex 28.90%

Total 100% The results of performing the above four tests on the obtained moisture-proof wrapping paper are shown in Table 1 together with the results of the other Examples and Reference Examples. Incidentally, WVTR of polyethylene laminated wrapper, the thickness of polyethylene laminated layers if a 20 mu m, a 20 Bruno 24 hr Zm ^2. The moisture-proof wrapping paper obtained in Example 1 has almost no smell, has almost the same good moisture-proofness as polyethylene-laminated wrapping paper, and is also excellent in recyclability and adhesive resistance. At the same time, it was confirmed that the bending resistance was also good.

(Example 2)

In Example 2, all the procedures were the same as in Example 1 except that the coating amount was 25 g / m ² in terms of dry weight. The obtained results are shown in Table 1 together with the results of the other Examples and Reference Examples. The moisture-proof wrapping paper obtained in Example 2 also has almost no smell, has almost the same good moisture-proofing properties as polyethylene-laminated wrapping paper, and has excellent recyclability and adhesion resistance. It was also confirmed that the bending resistance was good. Hereinafter, specific examples of recyclable moisture-proof wrapping paper disclosed in the specification of the above-mentioned prior application (PCT / JP 02/05937) are shown as Reference Examples 1 to 3 for comparison. (Reference example 1) In Reference Example 1, commercially available calcium carbonate fine particles (TKF- ⁶⁵ , trade name, manufactured by Tjiwi Kimia), which account for ⁶⁵ % of particles having a particle size of 2 jum or less as the calcium carbonate fine particles, were used. Atarilate (made by CIBA

INTEMEDIATE2003 (trade name) The emulsion and the ester polymer were poured into an aqueous emulsion solution, thoroughly stirred, mixed, separated, and then dried to form a polymer film on the surface of the calcium carbonate fine particles.

The polymer-coated calcium carbonate and styrene-butadiene rubber latex (SBR) as a binder were dispersed in water to form a coating solution, and high-quality paper was used as the base paper to a dry weight of 27 g / m ² on one side. It was coated and dried to create a moisture-proof wrapping paper. The content of each composition in the moisture-proof layer is as follows. The contents shown below all represent% by weight. Calcium carbonate 52. 30%

Ally Acrylate 10.2%

Esthenole polymer

Acrylic acid 3.27%

• Propylene Dali Cornole 1.72%

• Ammonia 3.36%

SBR latex 28.83%

The same test as in Example 1 was performed on the obtained moisture-proof wrapping paper, and the results are shown in Table 1 together with the results of Example and other reference examples. (Reference Example 2)

In Reference Example 2, all components were the same as Reference Example 1 except that the content of each component in the moisture-proof layer was as follows. Calcium carbonate 5 1.95% Ester polymer

• Ataryl acid 3.56%

-Propylene glyco-1.88%

Ammonia 3.66%

Ally Acrylate Emulsion: 13.0 0%

SBR latex: 25.95%

Total: 100% The obtained results are shown in Table 1 together with the results of the examples and other reference examples. (Reference example 3)

In Reference Example 3, all components were the same as in Reference Example 1 except that the content of each component in the moisture-proof layer was as follows. Calcium carbonate: 5 1.95%

Ester polymer

• Ataryl acid 2.5 3%

• Propylene glycol 1.34%

Ammonia 2.6 2%

Arylakry: Emulsion: 12.99%

SBR latex: 28.57%

Totl: 100% The obtained results are shown in Table 1 together with the results of Examples and other reference examples. 【table 1】

〇: No floc = indicates good recyclability □: No surface-to-surface adhesion = indicates good adhesion resistance As is clear from the results in Table 1, the coating amount of Example 1 is as small as 18 g / m ² , but it is almost the same as that of Reference Example 3 where the coating amount is 27 g Zm ² . water vapor transmission rate of the moisture-proof wrapping paper after bending has been obtained, also intended a coating amount of 2 5 g / m ² and the multi Kushida example 2, the coating amount is 2 7 g / m ² Both the acceleration of water vapor and the like and the acceleration of water vapor after bending are superior to those of Reference Examples 1-3, and they have no odor, and they are almost the same in both recyclability and adhesion resistance as those of Reference Examples 1-3. It was confirmed that the moisture-proof wrapping paper was obtained. As described above, the moisture-proof wrapping paper of the present invention not only has no odor, but also has a good moisture-proof property due to a low water vapor permeation rate, and has excellent recyclability because no floc is generated when recycled. The moisture-proof layer does not transfer to photographic printing paper, has the effect of reducing the deterioration of waterproofness from the fold, and has the same moisture-proof performance as polyethylene-laminated moisture-proof packaging paper. Compared to polyethylene laminate moisture-proof wrapping paper that is recyclable, it has the excellent property of being environmentally friendly.

Claims

The scope of the claims

1. A recyclable moisture-proof wrapping paper characterized in that one side of the paper is coated with a moisture-proof layer containing at least the following components (1) to (3).

(1) Calcium carbonate fine particles

(2) A polymer thin film composed of arylacrylate emulsion and hydroxyethynolecellulose coating the individual calcium carbonate fine particles.

(3) Synthetic rubber latex composed of other compounds copolymerizable with the conjugated diene compound

2. The claim, wherein the calcium carbonate fine particles have a particle size of 2 μπι or less as a main component, and are contained in the moisture-proof layer at a ratio of 45 to 65% by weight. A recyclable moisture-proof wrapping paper according to item 1. 3. polymer film covering the individual calcium carbonate particles, the content by percentage of the Ariruakuri rate moistureproof layer is 1 0-2 5 weight ^_0/0, human de Loki shell chill cellulose 0.2 to 2 wt% The recyclable moisture-proof wrapping paper according to claim 1, characterized in that the wrapping paper is recycled.

4. The recyclable moisture-proof wrapping paper according to claim 1, wherein the synthetic rubber latex comprising another compound copolymerizable with the conjugated diene compound is styrene-butadiene rubber latex.

5. The coating amount of the moisture-proof layer is 15 to 30 g / cm ² , and the water content is 3.0 to 4.5 weight. 2. The recyclable moisture-proof wrapping paper according to claim 1, wherein the ratio is / ₀ .