Sheetlike products and interior finishing materials

Abstract

A sheetlike product comprising a nonwoven fabric obtained by entangling ultrafine-denier fibers having single-fiber finenesses of 0.5dtex or below and an elastic resin binder containing a polyurethane as the main component, wherein the polyurethane is a polycarbonate-base polyurethane which has polycarbonate skeletons represented by the general formulae (1) and (2) and a gel point of 2.5 ml or above but below 6 ml: (1) wherein R1 and R2 are each independently an aliphatic hydrocarbon group having 7 to 11 carbon atoms; n and m are each a positive integer; and when R1 and R2 are different, the two kinds of units may be copolymerized in block or at random] and (2) wherein R3 and R4 are each independently an aliphatic hydrocarbon group having 3 to 6 carbon atoms; x and y are each a positive integer; and when R3 and R4 are different, the two kinds of units may be copolymerized in block or at random.

Description

technical field [0001] The present invention relates to sheets, in particular to napped leather-like sheets. Background technique [0002] On the surface of the sheet formed by impregnating polyurethane resin in the base material made of fibers, by using sandpaper or the like to roughen the fibers, a napped leather-like sheet of imitation suede or imitation sanded cowhide can be obtained. is well known. The properties of the intended leather-like sheet can be arbitrarily broadly designed by combining a base material composed of fibers and a polyurethane resin. For example, Patent Document 1 discloses that by adopting a polyurethane resin using polytetramethylene glycol, an organic diisocyanate, and a diol chain extender, it is possible to obtain an Disadvantaged, artificial leather-like with an extremely soft hand. [0003] On the other hand, the brushed imitation leather sheet has an appearance and surface similar to natural leather, and can be seen to have advantages su...

AI Technical Summary

Problems solved by technology

[0009] These polyurethane resins are suitable for use as a resin impregnated into a non-woven fabric made of ultrafine fibers and made to exist in the internal space of the non-woven fabric. In the case of a roughened leather sheet obtained by shaving the surface and roughening the surface fibers, for example, the copolymerized polycarbonate-based polyurethane resin with 4 to 6 carbon atoms described in Patent Document 4 cannot be obtained. The softening effect of the degree of grinding becomes a rough surface with short naps on the surface, so it is extremely difficult to obtain a good grade with beautiful naps

In addition, since the polycarbonate-based polyurethane resin derived from 2-methyl-1,8-octanediol described in Patent Document 5 uses a long-chain alkylene glycol, after being impregnated into a nonwoven fabric, In the case of wet coagulation, the coagulation speed is remarkably fast, and the foaming of the polyurethane inside the nonwoven fabric is large and coarse, and in addition, partial foaming results in poor results, and there is the following problem. In some cases, only the length of the nap on the surface can be obtained, resulting in uneven nap quality and very poor flakes

In the case of napping a sheet impregnated with polyurethane resin mainly composed of polycarbonate modified with polysiloxane polyols having hydroxyl groups at both ends, through normal grinding, in order to obtain ideal The length of nap, beautiful appearance, the content of polysiloxane polyol should be at least 10% by weight relative to the polymer diol mainly composed of polycarbonate diol, but when the polyurethane resin contains actually When the polysiloxane polyol is more than 10% by weight, the light resistance of the polyurethane resin is significantly deteriorated, and the pilling and pilling of the fiber are prone to occur, and a sheet with satisfactory durability cannot be obtained.

[0013] As mentioned above, in the prior art, it is extremely difficult to stably obtain a napped leather-like sheet with excellent handle, nap quality and durability.

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