JP2000212499A - Hot melt composition, moistureproof paper using the composition and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot melt composition which provides a moistureproof paper which is excellent in disaggregation property to water, moistureproof property, abrasion resistance, and blocking resistance. SOLUTION: This composition comprises (A) 30-55 pts.wt. of an amorphous poly-α-olefin, (B) 20-45 pts.wt. of a wax, (C) 2-20 pts.wt. of a polyolefin resin, (D) less than 3-10 pts.wt. of a resin giving adhesiveness, (E) 0-15 pts.wt. of an agent giving compatibility (The total of (A), (B), (C) and (D) is 100 pts.wt.).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt composition, a disintegratable moisture-proof paper using the same, and excellent in moisture-proof, slip-proof and blocking-resistance, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, it is well known that a polymer compound having a film-forming property is applied or bonded to paper to form a moisture-proof and waterproof paper having moisture-proof and waterproof properties. For example, wrapping paper laminated with a polyolefin polymer compound such as polyethylene and polypropylene has sufficient moisture-proof and waterproof properties. However, such a laminated paper cannot be sufficiently disintegrated at the time of recovery of the used paper, so that it cannot be reused as the used paper, and there is a concern about the effect on the environment. In contrast, as packaging paper that can be recycled,
Many production methods based on applying a coating liquid obtained by mixing an acrylic emulsion and a styrene-butadiene latex with a wax emulsion have also been disclosed. However, although these wrapping papers sufficiently satisfy the requirement of disintegration, after being wound up, there is a problem that the wax component contained in the moisture-proof layer is transferred to the opposite surface and becomes very slippery. .

[0003] Hot melt compositions for imparting moisture resistance are widely used in the industry for packaging. However, those hot melt compositions are often used as an adhesive for bonding paper and paperboard, etc.,
High stickiness. For this reason, even if it is applied on paper with reduced adhesiveness, for example, when it is wound up and stored in a roll state for a long period of time, there is a drawback that a so-called blocking phenomenon occurs in which the front and back surfaces of the moisture-proof paper adhere to each other within the roll. .

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and provides a hot melt composition which can be defibrated and provides a moisture-proof paper having excellent moisture resistance, slip resistance and blocking resistance. An object of the present invention is to provide a moisture-proof paper used and a method for producing the same.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by using a hot-melt composition containing specific components in a specific ratio,
It has been found that moisture-proof paper satisfying the above object can be provided.

That is, a first aspect of the present invention is the following component (A):
~ (E) [however, (A), (B), (C), (D),
(E) in total of 100 parts by weight]. (A) Amorphous polyalphaolefin 30-55
Parts by weight, (B) 20 to 45 parts by weight of wax, (C) 2 to 20 parts by weight of polyolefin resin, (D) 3 to less than 10 parts by weight of tackifying resin, (E) 0 to 15 parts by weight of compatibilizer.

In a preferred embodiment, (A) the amorphous polyalphaolefin is propylene alone or a propylene-ethylene copolymer. In a preferred embodiment, (B) the wax has a softening point of 105 ° C.
This is a crystalline polyolefin wax (claim 3). In a preferred embodiment, the polyolefin resin (C) is polypropylene (Claim 4).
In a preferred embodiment, the tackifying resin (D) is at least one selected from the group consisting of aliphatic or aromatic hydrocarbon resins, terpene resins, and rosin resins (Claim 5). In a preferred embodiment, the compatibilizer (E) is a polyolefin resin to which an acid component has been grafted (claim 6). In a preferred embodiment, (C) the polyolefin resin is 10 to 20 parts by weight (claim 7). In a preferred embodiment, (E) the compatibilizing agent is 0 to
It is 7 parts by weight (claim 8).

A second aspect of the present invention is directed to a moisture-proof paper comprising a paper substrate and the above-mentioned hot melt composition layer (claim 9).

A third aspect of the present invention is directed to a method for producing a moisture-proof paper, which comprises applying the hot melt composition on a paper substrate (claim 10).

[0010]

DETAILED DESCRIPTION OF THE INVENTION The amorphous polyalphaolefin (A) used in the present invention includes amorphous olefins such as propylene homopolymer, propylene-ethylene copolymer and propylene-butene-1 copolymer. Although a propylene homopolymer and a propylene-ethylene copolymer are particularly preferable, they exhibit good performance in blocking resistance. Their molecular weight is 1
Those having about 0000 to 120,000 are suitable. If the molecular weight is less than 10,000, sufficient blocking resistance may not be obtained, and if it exceeds 120000, the resin may have poor fluidity and a uniform moisture-proof layer may not be formed, so that good moisture-proof properties may not be obtained. . These can be used alone or 2
A mixture of more than one species is used. The amount of the amorphous polyalphaolefin used is 30 to 55 parts by weight. 30
If the amount is less than 5 parts by weight, the moisture resistance deteriorates, and the blocking resistance becomes insufficient. If the amount exceeds 55 parts by weight, the blocking resistance and the disaggregation deteriorate.

The wax (B) used in the present invention includes:
Broadly speaking, there are two types, natural waxes and synthetic waxes, and any of these waxes may be used. Natural waxes include paraffin wax, microcrystalline wax, montan wax, carnauba wax, candelilla wax and the like, and synthetic waxes include polyolefin waxes such as polyethylene wax and polypropylene wax. These are used alone or in combination of two or more. In particular, a crystalline polyolefin wax having a softening point of 105 ° C. or more and a crystalline polyolefin-based wax is preferable in that it shows good performance in slip resistance. The amount of wax used is 20 to 45 parts by weight. 2
If the amount is less than 0 parts by weight, the moisture resistance and the blocking resistance will be poor, and if it exceeds 45 parts by weight, the slip resistance will be poor and the blocking resistance will be insufficient.

Examples of the polyolefin resin (C) used in the present invention include polyethylene and polypropylene. Among them, polypropylene which is particularly crystalline and which is used for injection molding and the like is preferable because of its excellent heat resistance. is there. Further, the molecular weight is preferably in the range of 10,000 to 50,000. If the molecular weight is less than 10,000, the heat resistance at the time of papermaking after defibration tends to be insufficient, and
If it exceeds 0, melt mixing tends to be difficult. The amount of the polyolefin resin used is 2 to 20 parts by weight, preferably 10 to 20 parts by weight. If less than 2 parts by weight, heat resistance,
Moisture resistance and blocking resistance become insufficient, and if it exceeds 20 parts by weight, moisture resistance and blocking resistance decrease.

As the tackifier resin (D) used in the present invention, those having a functional group include rosin, modified rosin, ester compounds thereof, alkylphenol resin, rosin and alkylphenol-modified xylene resin, terpene phenol resin and the like. And those having no functional group include terpene-based resins, aliphatic hydrocarbon-based resins, styrene-based resins, aromatic hydrocarbon-based resins, cumarone-indene resins, and isoprene-based resins. Any of these may be selected, and two or more of them may be used in combination. The amount of tackifier resin used is less than 3 to 10 parts by weight. If the amount is less than 3 parts by weight, the moisture resistance, the disaggregation property and the blocking resistance are poor, and the slip resistance is insufficient. If the amount is 10 parts by weight or more, the slip resistance and the blocking resistance deteriorate.

The compatibilizing agent (E) used in the present invention includes polyolefin resins such as polyethylene and polypropylene grafted with an acid component such as maleic anhydride; ethylene-vinyl acetate copolymer; Propylene copolymers and the like may be mentioned, and these may be used alone or in combination of two or more. The molecular weight is preferably in the range of 10,000 to 50,000. If the molecular weight is less than 10,000, heat resistance tends to be insufficient, and if it exceeds 50,000, the effect of compatibilization tends to decrease. The amount of the compatibilizer used is 0 to 15 parts by weight, preferably 0 to 7 parts by weight.
Although sufficient moisture-proofing properties can be obtained without using a compatibilizing agent, the moisture-proofing properties can be further improved by using a compatibilizing agent within a range of 15 parts by weight or less. 1
If the amount exceeds 5 parts by weight, the thermal stability, moisture resistance and blocking resistance of the hot melt composition become insufficient.

In the present invention, the amount of each component used is 100 parts by weight in total of components (A) to (E). If necessary, the hot melt composition according to the present invention may further contain additives such as a phenol-based antioxidant and a sulfide-based secondary antioxidant.

The above-mentioned hot melt composition forms, for example, a moisture-proof layer by being coated on a paper base material, and is excellent in disintegration properties and is excellent in moisture-proof properties, slip resistance and blocking resistance. Can be provided. There are a configuration in which a moisture-proof layer is provided on one or both sides of a paper base, a laminated paper in which a moisture-proof layer is sandwiched between paper bases, and the like, which can correspond to any production method used for polyolefin laminate paper. As a method of applying to the paper substrate, a roll coater, a slot orifice coater, an extrusion coater, or the like can be used, but is not limited thereto, and any manufacturing method may be used.

[0017]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the following description, unless otherwise specified,%
Indicates the weight%.

The moisture-proof papers produced in the following Examples and Comparative Examples were evaluated by the following methods.

(1) Moisture Permeability (Moisture Proof) Based on the cup method (JIS Z 0208), the measurement was performed on a flat plate with the coated surface outside. If the moisture permeability value is 50 g / m ² · 24 hr or less, there is sufficient practicality.

(2) Disintegration properties Using a standard pulp disintegrator manufactured by Kumagai Riki Kogyo Co., Ltd.,
40 g (pulp concentration: 2%) of a moisture-proof paper sample cut into a 1.5 cm square was added to 2 L of water and stirred for 30 minutes, and then the resin dispersibility of the pulp solution and the paper made was visually determined according to the following criteria. I do. ：: Almost no resin was found in the paper. ×: Resin not finely dispersed adheres to and exists on the paper made.

(3) Slip resistance A bleached kraft paper is fixed on a horizontal plate with an adhesive tape so as not to cause wrinkles or loosening. On the other hand, a test piece made of moisture-proof paper is brought into close contact with the weight, and both ends are adhered to the front and rear side faces of the weight with an adhesive tape so that wrinkles and looseness do not occur on the sliding surface (surface), thereby forming a test piece for the weight. Approximately 20 pieces on a test piece made of bleached kraft paper at a tensile speed of 300 mm / min.
Slide the 0 mm weight test piece. Record the frictional force between the surface of the bleached kraft paper that has been slid and the new bleached kraft paper that has not been slipped, and record the frictional force between the new bleached kraft papers that have not been slipped. Convert the difference. Horizontal plate: about 75 mm in width, 200 mm in length Weight: 60 mm in width, 100 mm in length, 1000 g in weight Static friction coefficient: The ratio of the frictional force for preventing the initial movement of the paper to the force applied perpendicular to the paper Dynamic frictional coefficient: The ratio of the frictional force trying to stop the movement of the moving paper to the force applied vertically

(4) Blocking resistance After drying the moisture-proof paper at 50 ° C. for 1 hour, it is cut into a size of 5 cm × 5 cm and overlaid so that the moisture-proof layer is on the top, and 6 kg /
Crimping was performed for 15 minutes under the condition of cm ² . Next, the state of adhesion of the laminate is observed and evaluated according to the following criteria. ：: easily peeled off. C: Peeling is possible, but crackling and peeling noise are generated. ×: Cannot be peeled.

Example 1 As the component (A), amorphous polyalphaolefin (A1) (polypropylene homopolymer, molecular weight 7000)
0, APAO) 39%, polypropylene wax (B1) as a component (B) (softening point 154 ° C., penetration 1 or less,
Molecular weight 19000) 36%, polypropylene resin (C1) [MFR (230 ° C.) = 55 g / 1 as a component (C)]
0 min, melting point 157 ° C, molecular weight 40000] 14%,
(D) 7% of a terpene phenol resin (D1) (softening point: 145 ° C., acid value: 2 or less, molecular weight: 1000) as a component;
As the component (E), maleic anhydride-modified polypropylene (E1) (molecular weight: 40,000, softening point: 154 ° C., acid value: 2)
6) A composition comprising 3% and 1% of a hindered phenolic antioxidant (melting point: 110 to 125 ° C.) as a stabilizer is heated to 180 ° C., and when all the materials are dissolved, each component is uniformly dispersed. As described above, a hot melt composition was prepared. The resulting hot melt composition was coated on 75 g / m ² kraft paper using a pre-heated Meyer bar at 20 g / m ² to produce a moisture-proof paper.

As shown in Example 2 in Table 1, (C1) a 16%, (D) C ₅ hydrocarbon resin (D2) as the component (softening point 100 ° C., an acid value 0.1, molecular weight 1050) 8 % And (E1) were changed to 0%, respectively, to produce a moisture-proof paper in the same manner as in Example 1.

Comparative Example 1 As shown in Table 1, (A1) was 50% and (B1) was 32%.
%, (C1) 9%, (D1) 2%, (E1) 6%
A moisture-proof paper was manufactured in the same manner as in Example 1, except that the respective materials were changed as follows.

Comparative Example 2 As shown in Table 1, as the component (A), amorphous polyalphaolefin (A2) (propylene-butene-1) was used.
Copolymer, molecular weight 10,000, APAO) 50%, (B
1) 32%, polypropylene resin (C) as component (C)
2) [MFR (230 ° C.) = 45 g / 10 min, melting point 15
7 ° C., molecular weight 50000] 9%, (D2) 2%, (E)
Maleic anhydride-modified polypropylene (E2) as a component
(Molecular weight 50000, softening point 154 ° C, acid value 26) 6%
A moisture-proof paper was manufactured in the same manner as in Example 1 except that the above was used.

Comparative Example 3 As shown in Table 1, as the component (A), amorphous polyalphaolefin (A3) (propylene-ethylene copolymer, molecular weight 120,000, APAO) 50%,
(B) 32% of polyethylene wax (B2) (softening point 105 ° C., penetration 3, molecular weight 6400) as a component,
As the component (C), a polyethylene resin (C3) [MFR
(190 ° C.) = 70 g / 10 min, melting point 102 ° C., molecular weight 10,000] 9%, water-added rosin resin (D3) as a component (D) (softening point 90 ° C., acid value 2-10, molecular weight 100)
0) 2%, (E) maleic anhydride-modified polyethylene (E
3) (Molecular weight 10,000, softening point 108 ° C, acid value 30)
A moisture-proof paper was manufactured in the same manner as in Example 1 except that 6% was used.

Comparative Example 4 An emulsion obtained by emulsifying an acrylate-styrene copolymer and wax (Sibinol, trade name, manufactured by Siden) was applied (solid content: 20 g / m ² ) to produce a moisture-proof paper.

With respect to the obtained moisture-proof paper, the moisture permeability (moisture-proof property), defibration property, slip resistance and blocking resistance were measured by the above-mentioned methods. As shown in Table 1, the results were as shown in Examples 1 and 2
Although the moisture-proof property, the disintegration property, the slip resistance and the blocking resistance are all sufficiently satisfied, Example 1 containing the compatibilizer of the component (E) is more satisfactory than Example 1 containing no compatibilizer. Better moisture resistance than 2. On the other hand, in Comparative Examples 1 to 3, since the amount of the tackifying resin as the component (D) is small, the moisture resistance, the disintegration, and the blocking resistance are poor, and the slip resistance is insufficient. Comparative Example 4 is a moisture-proof paper of an emulsion coating type, but has insufficient slip resistance and blocking resistance.

[0030]

[Table 1]

Example 3 As shown in Table 2, (A3) was 35% and (B2) was 35%.
%, (C3) to 18%, and (D3) to 8%, respectively, and further, as the component (E), ethylene-vinyl acetate copolymer (E
4) A moisture-proof paper was manufactured in the same manner as in Example 1 except that 3% of [melting point 75 ° C., molecular weight 14000] was used.

Example 4 As shown in Table 2, (A3) was 35% and (B2) was 35%.
%, (C3) was changed to 18%, and (D3) was changed to 8%. Further, as the component (E), an ethylene-propylene copolymer (E5) [MFR (230 ° C.) = 35 g / 10 min, Vicat softening point Example 1 except that 3% was used.
A moisture-proof paper was manufactured in the same manner as described above.

Example 5 As shown in Table 2, (A2) was 45% and (B1) was 40%.
%, (C2) 9%, (D2) 3%, (E3) 2%
A moisture-proof paper was manufactured in the same manner as in Example 1 except that the above was changed.

Comparative Example 5 As shown in Table 2, (A1) was 35% and (B1) was 30%.
%, (C1) was 10%, (D1) was 18%, and (E1) was 6%, and a moisture-proof paper was produced in the same manner as in Example 1.

Comparative Example 6 As shown in Table 2, (A3) was 44% and (B2) was 22%.
%, (C3) 6%, (D3) 23%, (E3) 4%
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 7 As shown in Table 2, (A2) was 50% and (B1) was 32%.
%, (C2) 3%, (D2) 11%, (E2) 3%
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

The moisture-proof paper thus obtained was measured for moisture permeability (moisture proof), defibration, slip resistance and blocking resistance. As shown in Table 2, the results of Examples 3 to 5 are good in moisture proofing property, defibration property, slip resistance, and anti-blocking property. Since the amount is too large, slip resistance and blocking resistance are poor.

[0038]

[Table 2]

Example 6 As shown in Table 3, (A2) was 39% and (B1) was 36%.
%, (C2) is 14%, (D2) is 7%, and (E2) is 3%.
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 8 As shown in Table 3, (A1) was 60% and (B1) was 22%.
%, (C1) is 2%, (D1) is 3%, and (E1) is 12%.
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 9 As shown in Table 3, (A2) was 27% and (B1) was 41%.
%, (C2) 18%, (D2) 9%, (E2) 4%
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 10 As shown in Table 3, (A3) was 33% and (B2) was 49%.
%, (C3) is 2%, (D3) is 3%, and (E3) is 12%.
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 11 As shown in Table 3, (A1) was 49% and (B1) was 18%.
%, (C1) 18%, (D1) 9%, (E1) 5%
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

The moisture-proof paper thus obtained was measured for moisture permeability (moisture proof), defibration, slip resistance and blocking resistance. As shown in Table 3, the results were as follows.
All of the disintegration, slip resistance and blocking resistance are sufficiently satisfied. On the other hand, in Comparative Example 8, the amount of the amorphous olefin as the component (A) was too large, and both the disintegration and the blocking resistance were poor. In Comparative Example 9, on the other hand, the moisture resistance was poor because the component (A) was too small. Insufficient and blocking resistance is also insufficient. In Comparative Example 10, the slip resistance was poor due to too much wax as the component (B), and the blocking resistance was also insufficient. In Comparative Example 11, on the other hand, the moisture resistance and moisture resistance were low because the component (B) was too small. Poor blocking resistance.

[0045]

[Table 3]

Example 7 As shown in Table 4, (A3) was 39% and (B2) was 36%.
%, (C3) 14%, (D3) 7%, (E3) 3
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 12 As shown in Table 4, (A2) was 33% and (B1) was 40%.
%, (C2) 22%, (D2) 3%, (E2) 1
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

Comparative Example 13 As shown in Table 4, (A3) was 49% and (B2) was 41%.
%, (C3) 1%, (D3) 5%, (E3) 3%
A moisture-proof paper was manufactured in the same manner as in Example 1 except that the above was changed.

Comparative Example 14 As shown in Table 4, (A1) was 33% and (B1) was 40%.
%, (C1) 3%, (D1) 7%, (E1) 16
%, And moisture-proof paper was manufactured in the same manner as in Example 1 except that the percentages were changed.

The moisture-proof paper thus obtained was measured for moisture permeability (moisture proof), defibration, slip resistance and blocking resistance. As shown in Table 4, the results were as follows.
All of the disintegration, slip resistance and blocking resistance are sufficiently satisfied. On the other hand, in Comparative Example 12, the moisture resistance was poor and the blocking resistance was insufficient because the polyolefin resin of the component (C) was too large.
Conversely, because the amount of the component (C) is too small, and in Comparative Example 14, the amount of the compatibilizer of the component (E) is too large, both the moisture resistance and the blocking resistance are insufficient.

[0051]

[Table 4]

[0052]

As described above, the hot melt composition of the present invention can provide a moisture-proof paper which can be disaggregated and is excellent in moisture resistance, slip resistance and blocking resistance.

Continued on the front page (72) Inventor Minoru Tsuzuki 4-13-18 Anritsu, Suminoe-ku, Osaka-shi, Osaka Inside Goyo Paper Works Co., Ltd. (72) Inventor Hiirori Ohara 4- 13-18, Anritsu, Suminoe-ku, Osaka-shi, Osaka No. Go-Term Paper Co., Ltd. F-term (reference) 4J038 BA211 BA222 BA232 CB021 CB022 CB052 CB081 CB082 CB091 CP032 NA04 NA07 NA10 PC10 4L055 AG50 AG51 AG57 AG59 AG60 AG61 AG70 AG79 AG89 AG92 AG94 AH50 AJ02 BE08 EA20

Claims (10)

[Claims] 1. The following components (A) to (E) (provided that the total of (A), (B), (C), (D) and (E) is 10
0 parts by weight]: (A) amorphous polyalphaolefin 30 to 55
Parts by weight, (B) 20 to 45 parts by weight of wax, (C) 2 to 20 parts by weight of polyolefin resin, (D) 3 to less than 10 parts by weight of tackifying resin, (E) 0 to 15 parts by weight of compatibilizer. 2. The hot melt composition according to claim 1, wherein (A) the amorphous polyalphaolefin is propylene alone or a propylene-ethylene copolymer. 3. The hot melt composition according to claim 1, wherein the wax (B) is a crystalline polyolefin wax having a softening point of 105 ° C. or higher. 4. The hot melt composition according to claim 1, wherein the polyolefin resin (C) is polypropylene. 5. The hot melt composition according to claim 1, wherein (D) the tackifier resin is at least one selected from the group consisting of aliphatic or aromatic hydrocarbon resins, terpene resins, and rosin resins. object. 6. The hot melt composition according to claim 1, wherein (E) the compatibilizer is a polyolefin resin to which an acid component has been grafted. 7. The method according to claim 1, wherein the polyolefin resin (C) is 10 to 10.
The hot melt composition according to claim 1, which is 20 parts by weight. 8. The hot melt composition according to claim 1, wherein the compatibilizing agent (E) is 0 to 7 parts by weight. 9. A moisture-proof paper comprising a paper base material and the hot-melt composition layer according to claim 1. 10. A method for producing a moisture-proof paper, comprising applying the hot melt composition according to claim 1 on a paper substrate.