Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1987-12-02
1990-10-30
Ives, P. C.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428372, 428374, 428375, 428377, 428394, 428395, 428400, 428401, 428913, 156271, B32B 2714, B32B 516, B29D 900
Patent
active
049668099
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water-absorbing composite body and a process for the preparation thereof. More particularly, the present invention relates to a water-absorbing composite body comprising a tape-shaped laminate having at least one layer of a high-melting-point synthetic resin and at least one layer of a low-melting-point synthetic resin, a split yarn obtained by splitting said tape-shaped laminate or a composite fibrous body having said laminate structure, and a powdery polymeric water absorber fusion-bonded to the surface thereof, and a process for the preparation of this water-absorbing composite body.
BACKGROUND ART
Waterproof covering materials formed by utilizing a water-absorbing or moisture-absorbing material are used in various fields. For example, in so-called conduction cables such as telecommunication cables and optical fiber communication cables, there must be no intrusion of water or moisture from the outside, and therefore, an especially elaborate waterproof covering is formed on the joins between cables. This waterproof covering is formed by applying a waterproof covering material to the join, winding a water-absorbing and moisture-absorbing material on the outer surface of the waterproof covering material, and coating a waterproof material such as a rubber on the water-absorbing and moisture-absorbing material. Water or moisture intruding into the covering layer through the outermost waterproof material is absorbed in the water-absorbing and moisture-absorbing material and is prevented from reaching the cable.
As the water-absorbing and moisture-absorbing material, there are used, for example, a split fiber of polyethylene glycol-impregnated polypropylene and a diethylene glycol-impregnated paper. However, these water-absorbing materials are difficult to handle because of their wettability, and furthermore, since a fluid is contained as the constituent, reproduction of the covering is very difficult.
As a means for solving these problems, a method has been proposed in which a powdery polymeric water absorber is incorporated and kneaded into a polyolefin at the extrusion step and a waterproofing property is imparted by subjecting the extrusion-shaped film to a drawing treatment and a splitting treatment. However, a polymeric water absorber generally has a poor resistance to heat, and if the polymeric water absorber is placed even at a melting temperature of a synthetic resin such as a polyolefin for a long time before extrusion shaping, the water-absorbing capacity is degraded, and moreover, the polymeric water absorber is substantially buried in the resin after extrusion shaping and the amount of the polymeric water absorber exposed to the surface is very small. Therefore, a satisfactory water-absorbing effect is not attained.
It is an object of the present invention to provide a water-absorbing material having a high water-absorbing efficiency and a good mechanical strength.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a water-absorbing composite body comprising a tape-shaped laminate having at least one layer of a high-melting-point synthetic resin and at least one layer of a low-melting-point synthetic resin, in which at least a part of the low-melting-point synthetic resin layer is exposed to the surface, a split yarn obtained by splitting said tape-shaped laminate or a composite fibrous body having said laminate structure, and a powdery polymeric water absorber fusion-bonded to the outer surface of the low-melting-point synthetic resin layer exposed to the surface.
In accordance with another aspect of the present invention, there is provided a process for the preparation of a water-absorbing composite body, which comprises forming a tape-shaped laminate having at least one layer of a high-melting-point synthetic resin and at least one layer of a low-melting-point synthetic resin, in which at least a part of the low-melting-point synthetic resin layer is exposed to the surface, a split yarn
REFERENCES:
patent: 3935099 (1976-01-01), Weaver et al.
patent: 4457974 (1984-07-01), Summers
patent: 4560385 (1985-12-01), Baravian
patent: 4764427 (1988-08-01), Hara et al.
Hashimoto Akihiro
Kamei Ryosuke
Nakamura Akira
Ohira Katuzi
Tanaka Toyoaki
Ives P. C.
Showa Denko Kabushiki Kaisha
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