JP2983371B2 - Sheets with excellent design effects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like material having an excellent effect of forming designs such as characters and designs, and more particularly to the use of a heating mold when pressing a heating mold to form a design. The present invention relates to a sheet material excellent in design effect over a wide temperature range.

[0002]

2. Description of the Related Art Conventionally, as a sheet-like material for forming a design such as a character or a design by pressing a heated mold,
It is known that a porous resin layer made of polyurethane is formed on a sheet substrate obtained by adding a polymer elastic body to a fibrous substrate.

[0003] The sheet-like material as described above is, for example, 160 to
By pressing the mold heated to 210 ° C., an uneven design is formed on the surface, and the temperature of the mold used here needs to be appropriately set according to the softening temperature of the porous resin layer. is there. That is, when the softening temperature of the porous resin layer is high, the irregular shape is not sufficiently imparted unless the temperature of the mold is also increased accordingly. Conversely, if the softening temperature of the porous resin layer is low, the mold should not be heated to a correspondingly high temperature. If the temperature is too high, the sheet may stick to the surface of the mold.

In general, in shaping a design into a sheet having excellent design effects, a method in which a high-temperature mold is pressed for a short time is advantageous in terms of working efficiency, and therefore, the softening temperature of the porous resin layer is reduced. , Which are made of a resin having a temperature of 190 ° C. or higher.

However, when shaping a sheet having a porous resin layer having a high softening temperature, it is necessary to keep the temperature of the mold at a high temperature and within a certain range. When a large number of shaping processes are performed, it is difficult to precisely control the temperature to a fixed temperature, such as a temporary decrease in the temperature of the mold. For this reason, a favorable uneven shape cannot be given to the sheet-like material with a change in the temperature of the mold, and stable quality cannot be obtained.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have completed the present invention as a result of intensive studies in view of the above-mentioned problems, and an object of the present invention is to form a good shape by pressing a heating mold. It is an object of the present invention to provide a sheet-like material excellent in design effect that can perform shaping processing with stable quality even when the temperature of the heating mold fluctuates to some extent.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet-like material comprising a sheet base obtained by adding a polymer elastic body to a fibrous base, and a porous resin layer made of polyurethane. Further, the present invention is attained by a sheet-like material having an excellent design effect, wherein the porous resin layer is obtained by wet-solidifying a mixture of at least two types of polyurethanes having softening temperatures different by 30 ° C. or more.

In the present invention, the term “sheet base” refers to a fiber base made of a non-woven fabric, a woven fabric, a knitted fabric, or the like, to which an organic solvent solution or emulsion of a polymer elastic substance is applied and solidified. Is filled with a polymer elastic body, or a coating layer of the same polymer elastic body is formed on this surface,
The production may be performed by a known appropriate method.

Examples of the above polymer elastic body include polymers such as polyurethane resin, vinyl chloride resin, acrylate / styrene copolymer, styrene / butadiene copolymer, urethane / vinyl chloride copolymer, and mixtures thereof. And preferably a polyurethane resin and a mixture of a polyurethane resin and a urethane / vinyl chloride copolymer.

In the present invention, a resin layer having a porous structure is formed on the surface of the sheet substrate. The porous resin layer is made of polyurethane, and usually contains a pigment or dye dispersed therein for coloring into a desired color.
The polyurethane forming the porous resin layer is obtained by wet-solidifying a mixture of at least two types of polyurethanes having different softening temperatures.

The combination of the above-mentioned polyurethanes to be mixed has a softening temperature of 30 ° C. or higher, preferably 40 to 70 ° C.
It is a mixture of polyurethanes different in temperature. If the difference in the softening temperature of the polyurethane to be mixed is less than 30 ° C., the temperature range of the mold in which good shaping can be performed becomes narrow, and the temperature control of the mold must be strictly controlled accordingly. Examples of the combination of the polyurethane include those having a softening temperature of 180 to 220 ° C,
Combinations of ~ 150 ° C can be mentioned.

The mixing ratio of the polyurethane having a low softening temperature and the polyurethane having a high softening temperature is preferably 1: 9 to 9: 1, more preferably 1.5: 8.5.
４4: 6.

In the present invention, the porous resin layer is formed by a wet coagulation method. When the porous resin layer is formed by the dry foaming method, the color change when the design is shaped by the heating mold is poor, which is not preferable.

As a method of forming the porous resin layer on the surface of the sheet substrate, for example, a polyurethane mixed by the above-mentioned combination is dissolved in an appropriate organic solvent, and if necessary, a pigment or pigment of a desired color is dissolved. Add an appropriate amount of dye,
After forming an organic solvent solution, a method of applying the solution to the sheet substrate, performing wet coagulation, washing with water, and drying may be used.

The method of shaping a design such as a character or a pattern on the sheet-like material of the present invention may be a known appropriate method.
For example, a mold on which a design such as a character or a pattern is formed
What is necessary is just to heat to about 210 degreeC and to press with a pressure of ² to 50 kg / cm < ² >. The heating and pressing conditions may be set as appropriate according to the desired degree of shaping.

[0016]

According to the sheet-like material of the present invention, the suitable temperature range of a mold for shaping a design such as a character or a pattern is significantly wider than that of a conventional product. For this reason, even if the temperature of the mold fluctuates to some extent, it is possible to perform shaping processing with stable quality, which is extremely useful when shaping a large amount in a short time or when the temperature control of the mold cannot be performed very precisely. It is.

[0017]

The present invention will be described below in detail with reference to examples. In the examples and comparative examples, “parts” means “parts by weight”.

Example 1 Ester staple fiber (denier 1.5 denier, length 50 mm)
Nonwoven fabric (basis weight 240 g / m ² , thickness 1.6 m
m), a polyurethane elastomer 10 synthesized from polybutylene adipate glycol, diphenylmethane-4,4'-diisocyanate and ethylene glycol
After impregnating with a solution consisting of 0 parts, 1.5 parts of iron oxide brown and 100 parts of dimethylformamide, and wet-coagulated,
After sufficiently washing with water and drying, a substrate having a thickness of 1.5 mm and an apparent density of 0.34 g / cm ³ was obtained.

Next, on one surface of the obtained substrate, 80 parts of a polyurethane elastomer having a softening temperature of 190 ° C. synthesized in the same manner as described above, polybutylene adipate glycol, diphenylmethane-4,4′-diisocyanate and Softening temperature 1 synthesized from 1,6 hexanediol
20 parts 30 ° C. of polyurethane elastomer, the acid iron brown 2 parts by <br/> a colorant, dimethylformamide 3
Solution consisting of 0 parts and 3 parts of a surfactant is 800 g / m 2
^{After 2} coatings, they were immersed in water to solidify the polyurethane. This was washed with warm water to completely remove dimethylformamide, followed by drying to form a brown porous resin layer and obtain a sheet.

<Shaping> The obtained sheet-shaped material was heated at a temperature shown in Table 1 with a mold having an uneven pattern formed on the surface thereof and heated under pressure for 1 second to perform shaping.

The results are as shown in Table 1, and a good three-dimensional design was formed at any heating temperature.

Example 2 Polybutylene adipate glycol and diphenylmethane-diphenylmethane were used in place of the polyurethane elastomer having a softening temperature of 130 ° C. among the two polyurethane elastomers blended in the solution used for forming the porous resin layer in Example 1. A sheet was obtained in the same manner as in Example 1 except that 20 parts of a polyurethane elastomer having a softening temperature of 150 ° C synthesized from 4,4'-diisocyanate and 1,4-butanediol was used.

The obtained sheet was shaped in the same manner as in Example 1. The results were as shown in Table 1.

Example 3 The amount of the polyurethane elastomer having a softening temperature of 190 ° C. used in Example 1 was changed to 50 parts instead of 80 parts, and the amount of the polyurethane elastomer having a softening temperature of 130 ° C. was changed to 20 parts and changed to 50 parts. A sheet was obtained in the same manner as in Example 1, except that

The obtained sheet was subjected to shaping in the same manner as in Example 1. The results are as shown in Table 1.

COMPARATIVE EXAMPLE 1 Instead of the mixture of two kinds of polyurethane elastomers having different softening temperatures used in Example 1, a softening temperature of 1 was used.
A sheet was obtained in the same manner as in Example 1, except that 100 parts of a polyurethane elastomer at 50 ° C was used.

The obtained sheet was shaped in the same manner as in Example 1. The results were as shown in Table 1.

COMPARATIVE EXAMPLE 2 Instead of the mixture of two kinds of polyurethane elastomers having different softening temperatures used in Example 1, a softening temperature of 1 was used.
A sheet was obtained in the same manner as in Example 1 except that 100 parts of a polyurethane elastomer at 80 ° C was used.

The obtained sheet was shaped in the same manner as in Example 1. The results were as shown in Table 1.

[0030]

[Table 1]

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D06N 3/00-3/18 B32B 5/18 B32B 27/06 B32B 27/40

Claims (1)

(57) [Claims] 1. A sheet-like material comprising a sheet base obtained by providing a polymer elastic body to a fibrous base and a porous resin layer made of polyurethane, wherein the porous resin layer has a softening temperature. A sheet-like material having an excellent design effect, which is obtained by wet coagulating a mixture of at least two kinds of polyurethanes different by 30 ° C. or more.