JP2021160113A - Laminate having biomass-derived resin layer, and paper container for liquid and packaging product using the same - Google Patents

Abstract

To provide a laminate having a biomass-derived resin layer, the laminate having excellent workability and achieving reduced environmental load sufficient for countermeasures against global warming and the building of a recycling-based society, and a paper container for liquid and a packaging product each provided with the laminate.SOLUTION: The present invention provides a laminate 1 in which a biomass polyethylene resin layer 3 formed of a biomass polyethylene resin containing biomass-derived polyethylene and fossil fuel-derived polyethylene is provided on both or one of front and/or backs surfaces of a paper substrate layer 2. The biomass level in the biomass polyethylene resin layer is set to 70% or more, and the flexural modulus of the biomass polyethylene resin layer is set to 150 MPa or less, so that the amount of the fossil fuel used in the laminate 1 can be greatly reduced and the biomass polyethylene resin layer can be sealed at low temperatures.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminate having a resin layer derived from biomass, and a liquid paper container and a packaging product using the same.

In recent years, biomass has been widely used as a substitute for fossil fuels in the material field from the viewpoint of global warming countermeasures and the construction of a sound material-cycle society.
As one of its uses, a biomass polyethylene resin containing polyethylene derived from biomass and polyethylene derived from fossil fuel is used, for example, in a laminate used for liquid paper containers and packaging products based on paper, and is derived from fossil fuel. It is used as an alternative to polyethylene.

Conventionally, as a laminate in which a biomass polyethylene resin is used, it is a laminate including at least a first polyolefin resin layer, a paper base material layer, and a second polyolefin resin layer, and the first and first layers are described above. A laminate in which the polyolefin resin layer of No. 2 contains polyethylene derived from biomass and polyethylene derived from fossil fuel is disclosed (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2018-1609 JP-A-2018-1610

In a laminate using biomass polyethylene resin, biomass polyethylene resin that forms a polyolefin resin layer containing polyethylene derived from biomass and polyethylene derived from fossil fuel is sufficient for global warming countermeasures and construction of a recycling society. It must be able to respond to the reduction of environmental load, and when molding liquid paper containers, packaging products, etc. using laminates using biomass polyethylene resin, conventional filling machines and processing It must not impair the workability of the machine.
The present inventors have come to realize the present invention by paying close attention to such a viewpoint.

An object of the present invention is a laminate having a biomass-derived resin layer having good processability, which can sufficiently reduce the environmental load to cope with global warming countermeasures and the construction of a sound material-cycle society, and a liquid using the same. To provide paper containers and packaging products.

In order to achieve the above object, the invention according to claim 1 is a biomass containing polyethylene derived from biomass and polyethylene derived from fossil fuel on either the front or back surface of the paper substrate layer or either the front or back surface. It is a laminate provided with a biomass polyethylene resin layer formed of a polyethylene resin, characterized in that the biomass degree in the biomass polyethylene resin layer is 70% or more, and the bending elasticity of the biomass polyethylene resin layer is 150 MPa or less. do.

According to the invention of claim 1, since the biomass degree in the biomass polyethylene resin layer is 70% or more, the amount of fossil fuel used in the laminate provided with the biomass polyethylene resin layer can be significantly reduced. This will enable us to reduce the environmental load that can fully respond to global warming countermeasures and the construction of a sound-cycle society.
Further, since the bending elasticity of the biomass polyethylene resin layer of the biomass polyethylene resin forming the biomass polyethylene resin layer is 150 MPa or less, the bending repulsion of the laminate 1 is not too strong, and the laminate 1 is formed, for example. Good workability of liquid paper containers and packaging products.

The invention according to claim 2 is a liquid paper container, characterized in that the laminate according to claim 1 is used.

According to the invention of claim 2, since the liquid paper container is formed by using the laminate according to claim 1, the environmental load can be sufficiently reduced to cope with global warming countermeasures and the construction of a sound material-cycle society. It is possible to obtain a liquid paper container that has been made into a product, and since it has good workability, it is easy to mold.

The invention according to claim 3 is a packaged product, and is characterized by using the laminate according to claim 1.

According to the invention of claim 3, since the packaged product is molded by using the laminate according to claim 1, the environmental load can be reduced sufficiently to cope with global warming countermeasures and the construction of a sound material-cycle society. It is possible to obtain a packaged product in which the above is achieved, and since the workability is good, molding is easy.

According to the laminate having a biomass-derived resin layer according to the present invention, it is possible to reduce the environmental load that can sufficiently respond to global warming countermeasures and the construction of a sound material-cycle society. Then, the liquid paper container and the packaged product can be easily molded by using this laminated body.

It is explanatory drawing which shows the 1st example of the laminated structure of the laminated body which has a resin layer derived from biomass which concerns on this invention. It is explanatory drawing which shows the 2nd example of the laminated structure of the laminated body which has a resin layer derived from biomass which concerns on this invention. It is explanatory drawing which shows the 3rd example of the laminated structure of the laminated body which has a resin layer derived from biomass which concerns on this invention.

Hereinafter, an example of the laminate according to the present invention and the embodiment of the liquid paper container and the packaging product using the laminate will be described in detail.

First, an example of an embodiment of a laminate having a biomass-derived resin layer according to the present invention will be described.
FIG. 1 is an explanatory view showing a first example of a laminated structure of a laminated body having a biomass-derived resin layer according to the present invention.

The laminate 1 having the biomass-derived resin layer of this example (hereinafter, simply referred to as the laminate) is a biomass polyethylene resin containing polyethylene derived from biomass and polyethylene derived from fossil fuel on the surface of the paper base material layer 2. The formed biomass polyethylene resin layer 3 is laminated, and the barrier layer 4, the adhesive resin layer 5, and the thermoplastic resin layer 6 containing polyethylene as a main component are laminated in this order on the back surface of the paper base material layer 2. ing.

The paper base material in the paper base material layer 2 is not particularly limited, and a known paper base material used for liquid paper containers and packaging products is used.
Further, in this example, the back surface side of the paper base material layer 2 is the inner surface side of the liquid paper container or the packaging product.

The biomass polyethylene resin layer 3 laminated on the surface of the paper base material layer 2 contains polyethylene derived from biomass and polyethylene derived from fossil fuel.

Biomass-derived polyethylene consists of a polymer of biomass-derived ethylene-containing monomers.
The production of biomass-derived ethylene is not particularly limited, and is produced by a known method. In the production of ethylene derived from biomass, it is preferable to use fermented ethanol derived from biomass obtained from a plant raw material as a raw material. Examples of plant raw materials include, but are not limited to, corn, sugar cane, beet, and the like. The method for polymerizing a monomer containing ethylene derived from biomass is not particularly limited, and a known method can be used.

Further, the fossil fuel-derived polyethylene is composed of a polymer of a fossil fuel-derived ethylene and / or a monomer containing an α-olefin.
The production of ethylene and / or α-olefin derived from fossil fuel is not particularly limited, and a monomer produced by a known method and containing ethylene and / or α-olefin derived from fossil fuel is used. The method of polymerization is not particularly limited, and a known method can be used.

Further, the method for producing the biomass polyethylene resin layer 3 containing polyethylene derived from biomass and polyethylene derived from fossil fuel is not particularly limited, and a known method can be used.

Further, the flexural modulus of the biomass polyethylene resin forming the biomass polyethylene resin layer 3 is set to 150 MPa or less. When the flexural modulus of the biomass polyethylene resin exceeds 150 MPa, the bending repulsion of the laminate 1 becomes strong, which makes it difficult to mold, for example, a liquid paper container or a packaged product.
The flexural modulus of the biomass polyethylene resin is not particularly limited as long as it is 150 MPa or less, but it is preferably 150 MPa or more. If the flexural modulus of the biomass polyethylene resin is less than 40 MPa, the moldability is good but the strength is lowered, and the required strength may not be obtained depending on the liquid paper container or the packaging product.

Further, in this example, the blending of the biomass-derived polyethylene and the fossil fuel-derived polyethylene is such that the degree of biomass in the biomass polyethylene resin layer 3 is 70% or more.
When the biomass degree is 70% or more, the amount of fossil fuel used is significantly reduced by laminating the biomass polyethylene resin layer 3 on the laminate 1, which is sufficient for global warming countermeasures and the construction of a sound material-cycle society. It is possible to reduce the environmental load. If the biomass content is less than 70%, such an effect cannot be expected.

Further, the melt mass flow rate of the biomass polyethylene resin forming the biomass polyethylene resin layer 3 is set to 4.5 g / 10 min to 10 g / 10 min.
When the melt mass flow rate of the biomass polyethylene resin forming the biomass polyethylene resin layer 3 is 4.5 g / 10 min to 10 g / min, the biomass polyethylene resin easily flows, and the biomass polyethylene resin layer 3 can be sealed at a low temperature, so that the laminate It is possible to reduce the energy cost required for sealing processing of, for example, a liquid paper container or a packaged product molded in 1.
If the melt mass flow rate of the biomass polyethylene resin is less than 4.5 g / 10 min, a high temperature is required for sealing the biomass polyethylene resin layer 3, and the laminate 1 is molded, for example, sealing a liquid paper container or a packaging product. The energy cost required for this will increase. Further, if the melt mass flow rate of the biomass polyethylene resin exceeds 10 g / min, pinholes may be formed in the seal portion.

In this example, a deodorant is added to the biomass polyethylene resin forming the biomass polyethylene resin layer 3. As the deodorant added to the biomass polyethylene resin, a porous substance such as zeolite or silicate, a metal oxide, a chemically adsorbed substance having an acidic group or a basic group, or the like is used in this example. The deodorant added to the biomass polyethylene resin is added in a masterbatch. The amount of the deodorant added to the biomass polyethylene resin is preferably 0.1 to 10 parts by weight. If the amount of the deodorant added is less than 0.1 parts by weight, the odor of the biomass raw material of the biomass polyethylene resin may not be sufficiently deodorized, and if it exceeds 10 parts by weight, the odor of the first biomass polyethylene resin layer 3 may not be sufficiently deodorized. The strength may decrease.

The odor barrier layer 4 is made of aluminum foil, metal vapor deposition film, ceramic vapor deposition film other than metal, ethylene vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), polyethylene terephthalate (PET), nylon resin and the like. Will be done.

The adhesive resin layer 5 is not particularly limited as long as it is an adhesive resin as a material for forming the adhesive resin layer 5, but when the material of the odor barrier layer 4 is aluminum foil, both ethylene and methacrylic acid are used. A polymer resin (EMAA) is suitable.

Further, in this example, the thermoplastic resin layer 6 containing polyethylene as a main component is mainly composed of a high-pressure method low-density polyethylene resin.

According to the laminated body 1 of this example configured as described above, since the biomass degree in the biomass polyethylene resin layer 3 is 70% or more, the amount of fossil fuel used in the laminated body 1 including the biomass polyethylene resin layer 3 is used. It will be possible to significantly reduce the amount of fuel, and it will be possible to reduce the environmental load that can fully respond to global warming countermeasures and the construction of a sound-cycle society.
Further, since the bending elasticity of the biomass polyethylene resin layer of the biomass polyethylene resin forming the biomass polyethylene resin layer 3 is 150 MPa or less, the bending repulsion of the laminate 1 is not too strong, and the laminate 1 is formed, for example. Good workability of liquid paper containers and packaging products.

FIG. 2 is an explanatory view showing a second example of a laminated structure of a laminated body having a biomass-derived resin layer according to the present invention.
In the laminate 1 of this example, a biomass polyethylene resin layer 3 formed of a biomass polyethylene resin containing polyethylene derived from biomass and polyethylene derived from fossil fuel is laminated on the surface of the paper base material layer 2, and the paper base material layer 1 is formed. On the back surface of 2, a biomass polyethylene resin layer 7 formed of a biomass polyethylene resin containing polyethylene derived from biomass and polyethylene derived from fossil fuel, a barrier layer 4, an adhesive resin layer 5, and a thermoplastic containing polyethylene as main components. The resin layer 6 is laminated in this order.

The biomass polyethylene resin layer 3 of this example is the same as the biomass polyethylene resin layer 3 of the first example, and the biomass polyethylene resin layer 7 is the same as the biomass polyethylene resin layer 3, and the biomass polyethylene resin layer 3 of this example. And the biomass polyethylene resin layer 7 refer to the description of the biomass polyethylene resin layer 3 of the first example.

Further, the barrier layer 4 of this example, the adhesive resin layer 5 and the thermoplastic resin layer 6 containing polyethylene as main components are thermoplastic having the barrier layer 4 of the first example, the adhesive resin layer 5 and polyethylene as main components. Since it is the same as the resin layer 6, the description of the first example is used for each.
Further, the effect of this example is the same as that of the first example, and the explanation of the first example is incorporated.

FIG. 3 is an explanatory view showing a second example of a laminated structure of a laminated body having a biomass-derived resin layer according to the present invention.
In the laminated body 1 of this example, a thermoplastic resin layer 8 containing polyethylene as a main component is laminated on the surface of the paper base material layer 2, and the back surface of the paper base material layer 2 is derived from biomass as in the second example. A biomass polyethylene resin layer 7 formed of a polyethylene resin containing polyethylene and polyethylene derived from fossil fuel, a barrier layer 4, an adhesive resin layer 5, and a thermoplastic resin layer 6 containing polyethylene as a main component are formed. They are stacked in order.
Further, the effect of this example is the same as that of the first example, and the explanation of the first example is incorporated.

Next, an example of the embodiment of the liquid paper container and the packaged product using the laminated body 1 will be described in detail.
The liquid paper container and the packaged product according to the present invention are molded using the above-mentioned laminate 1, and are molded according to a known molding process. The shape of the liquid paper container and the packaged product to be molded is not particularly limited.

Since the liquid paper container and packaging product are molded using the above-mentioned laminate 1, the liquid paper container and packaging product are designed to reduce the environmental load that can sufficiently respond to global warming countermeasures and the construction of a sound material-cycle society. Is obtained. Since the laminated body 1 has good workability, it is easy to mold.

1 Laminate 2 Paper substrate layer 3 Biomass polyethylene resin layer 4 Barrier layer 5 Adhesive resin layer containing polypropylene as the main component 6 Thermoplastic resin layer containing polyethylene as the main component 7 Biomass polyethylene resin layer 8 Main component from polyethylene Thermoplastic resin layer

Claims (3)

A laminate having a biomass polyethylene resin layer formed of a biomass polyethylene resin containing biomass-derived polyethylene and fossil fuel-derived polyethylene on either the front or back surface of the paper base material layer or on either the front or back surface. A laminate having a biomass-derived resin layer, characterized in that the degree of biomass in the biomass polyethylene resin layer is 70% or more, and the bending elasticity of the biomass polyethylene resin layer is 150 MPa or less. A liquid paper container using the laminate according to claim 1. A packaged product using the laminate according to claim 1.

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