JPS6156097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-like body such as a footwear sole or a bathroom mat that does not sag when a sheet is wound around a roll during production and does not slip even on a smooth floor. .

Conventionally, sponge sheets made of ethylene vinyl acetate resin have been used as elastic plate-like bodies such as footwear soles and bath mats, but they have also been used for so-called P tiles, concrete floors, tile floors, etc.
There was a problem that smooth floors such as FRP floors were prone to slipping when leaking. In addition, when forming a sponge sheet using ethylene vinyl acetate resin, it is difficult to mix the ethylene vinyl acetate resin with fillers such as calcium carbonate, resulting in poor workability. When winding this up onto a winding roll, there was a problem in that a sagging phenomenon called the so-called "loincloth phenomenon" occurred, making it difficult to wind up.

The present invention was invented in view of the above points, and its purpose is that the upper layer serving as the substrate is not too soft and has shape retention, and does not sink too much when the foot is placed on it. In addition, since both the upper and lower layers are mainly made of ethylene vinyl acetate resin, it is easy to mix with the filler, and there is no sagging phenomenon called "loincloth phenomenon" when winding up on a roll during manufacturing, resulting in excellent workability. The purpose is to provide a plate-like body such as a footwear sole or a bath mat.

The plate-shaped bodies such as the footwear soles and bathroom mats of the present invention are made from sponge sheets made by mixing 2 to 10 parts by weight of polypropylene resin, fillers, foaming agents, etc. to 100 parts by weight of ethylene vinyl acetate resin. A lower layer is formed by mixing an ethylene vinyl acetate resin, a polypropylene resin in approximately the same amount as the ethylene vinyl acetate resin, a filler, a foaming agent, etc., and a sponge sheet is formed, and the upper and lower layers are integrated. It is a layered product. This will be explained in detail below. 2 to 10 parts by weight of polypropylene resin, filler, foaming agent, etc. are mixed with 100 parts by weight of ethylene vinyl acetate resin (EVA resin), and after kneading with a mill, mixer, etc., a sponge sheet is formed with a roll. and wind it onto a take-up roll. The upper layer 1 is obtained by pulling out the material wound on the above-mentioned winding roll and cutting or stamping it into the shape of a footwear sole, a bathroom mat, or other plate-shaped object to be obtained. In addition, ethylene vinyl acetate resin, polypropylene resin in approximately the same amount as the ethylene vinyl acetate resin, filler, foaming agent, etc. are mixed, and after kneading with a mill, mixer, etc., a non-stick sponge sheet is formed with a roll. This is wound onto a take-up roll. The lower layer 2 is obtained by cutting or stamping the material wound on the above-mentioned winding reroll into the shape of footwear, bathroom mat, or other plate-like object to be obtained.

An example of the composition of the upper layer 1 and the lower layer 2 is shown below.

<Composition of upper layer 1> Ethylene vinyl acetate resin 100 parts Polypropylene 2 to 10 parts Calcium carbonate 25 to 30 parts Blowing agent 3 parts Peroxide 1 part Stearic acid 1 part <Composition of upper layer 2> Ethylene vinyl acetate resin 60 parts Polypropylene 40 to 60 parts calcium carbonate 40 parts blowing agent 3 parts peroxide 1 part stearic acid 1 part Next, when the upper layer 1 and lower layer 2 were heated and pressurized while stacked, the ethylene vinyl acetate resin mixed in the upper layer and the ethylene vinyl acetate resin mixed in the lower layer were mixed. The ethylene vinyl acetate resin, the polypropylene resin mixed in the upper layer 1, and the polypropylene resin mixed in the lower layer 2 are completely melted and integrated at the contact area between the upper layer 1 and the lower layer 2, and the foaming agent foams to create a moderate amount of foam. A plate-like body such as a footwear sole or a bath mat having cushioning properties is obtained.

Here, the reason why polypropylene resin is mixed in an approximately equal amount to ethylene vinyl acetate resin in the lower layer 2 is that the polypropylene resin is mixed in an approximately equal amount to ethylene vinyl acetate resin.
The lower layer 2 is softer than the upper layer 1 and has an anti-slip effect. On the other hand, by mixing 2 to 10 parts by weight of polypropylene resin with respect to 100 parts by weight of ethylene vinyl acetate resin in the upper layer 1, it becomes easy to mix the ethylene vinyl acetate resin and a filler such as calcium carbonate, and it also provides appropriate flexibility. It is given a certain amount of flexibility and eliminates the so-called "loincloth phenomenon" when it is wound onto a take-up roll, and is given appropriate flexibility, but retains its shape. Also, the soles of the feet will not sink into them. In this case, if the upper layer 1 contains more than 10 parts by weight of polypropylene resin per 100 parts by weight of ethylene vinyl acetate resin, the upper layer 1 will become too soft and the sole of the foot will sink in when the foot is placed on it, and it will be difficult to maintain the shape of the substrate. Furthermore, if the amount of polypropylene resin is less than 2 parts by weight, it will be difficult to mix the ethylene vinyl acetate resin with fillers such as calcium carbonate, and it will be difficult to mix the polypropylene resin with fillers such as calcium carbonate. The so-called “loincloth phenomenon”
This causes a phenomenon called sagging, which worsens workability.

In the present invention, as described above, ethylene vinyl acetate resin and polypropylene resin are mixed in both the upper layer and the lower layer, and since the upper layer and the lower layer are heated and pressurized to form a single layer, the presence of ethylene vinyl acetate resin and polypropylene resin in the upper and lower layers, respectively The ethylene vinyl acetate resin and the polypropylene resin are both integrated as a binder, and there is no need for a separate special binder.Moreover, the lower layer is made by mixing approximately equal amounts of ethylene vinyl acetate resin and polypropylene resin. Because it is foamed, it is more flexible than the upper layer and has anti-slip effects.The upper layer also contains 100 parts by weight of ethylene vinyl acetate resin, 2 to 10 parts by weight of polypropylene resin, a filler, and a foaming agent. Because it is a mixture of ethylene vinyl acetate resin and filler, it is easy to mix the ethylene vinyl acetate resin and the filler, and there is no sagging phenomenon called "loincloth phenomenon" when winding it into rolls during manufacturing, making it possible to roll it accurately into rolls. The upper layer has a certain degree of flexibility, but it retains its shape so that it does not lose its role as a substrate, and the sole of the foot does not sink too much when the foot is placed on it. .

[Brief explanation of the drawing]

The drawing is a partially cutaway perspective view of a plate-like body such as a footwear sole and a bathroom mat according to the present invention, in which 1 is an upper layer, 2 is a
is the lower layer.

Claims (1)

[Claims] 1. 100 parts by weight of ethylene vinyl acetate resin is mixed with 2 to 10 parts by weight of polypropylene resin, a filler, a foaming agent, etc. to form an upper layer made of a sponge sheet, and the ethylene vinyl acetate resin and ethylene vinyl acetate resin are mixed together. Footwear soles, bath wash mats, etc. characterized by forming a lower layer made of a sponge sheet by mixing approximately equal amounts of polypropylene resin, filler, foaming agent, etc., and laminating the upper layer and lower layer as one layer. Platyform body.