Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1995-06-14
1999-07-13
McCamish, Marion E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428288, 428298, 4283044, 4283084, 4283111, 4283179, 428260, 428904, B32B 300, B32B 3300, B32B 2712, B32B 2740
Patent
active
059224452
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a composite material, which is flexible and durable, composed of fibrous base materials such as a yarn, woven fabric, nonwoven fabric, impregnated or coated with an elastic polymeric substance, and to a process for the production of the same. More spectifically, the present invention relates to a composite material (i) which is flexible and yet superior in the peel strength of the coating layer and other dynamic strength in the case of being coated and (ii) which is flexible and superior in the wear resistance and other durability contradictory to the same in the case of being impregnated, and to a process for the production of the same. Furthermore, the present invention relates to a composite material which is superior in flexibility and which is superior in durability maintaining its functions even after wearing and washing even in the case of impregnating or coating an elastic polymeric substance to which have been added antibacterial, deodorizing, heat storage, and moisture absorbing functional particles.
BACKGROUND ART
In recent years, interest has risen in comfort and health, in particular with respect to applications of clothing and daily necessities. Also, fabrics are being asked to (a) have high functionality, such as an antibacterial action, odor preventing action, deodorizing action, shielding from ultraviolet light, heat storage, etc. and (b) have comfort-related functions such as moisture permeability, waterproofness, water repellency, etc. for allowing sweat etc. to evaporate and the wearer to keep dry. As a method for realizing the functions of (a) above, use is generally made of the method for mixing in particles having the above functions with the yarn itself at the spinning stage (see Japanese Unexamined Patent Publication (Kokai) No. 2-182902) and the method of imparting the same by after-treatment methods such as impregnating or coating a fabric with a urethane or other resin in which particles have been added (see Japanese Unexamined Patent Publication (Kokai) No. 2-264074).
In the former method of mixing particles into the fibers, particles of a size on the submicron order enabling spinning are required. Even if addition is possible, the particles may lose their function due to the spinning conditions (particularly heat), the strength of the yarn may deteriorate or the spinning yield may fall, or it might not be possible to deal with small lots. For these and other reasons, it has been more convenient to impart the function by resin treatment and other after-treatment methods. In such after-treatment methods, however, there is the disadvantage that the resin constrains the fibers and therefore the feel of the fibrous substrate is remarkably impaired. Further, there was the problem that the resin itself would fall away during use or washing and the function would be lost.
On the other hand, a fabric having the functions of (b), that is, moisture permeability, waterproofness, and water repellency, is made much use of in sportswear applications such as for windbreakers. This fabric is generally obtained by coating a fabric with a urethane which foams at the time of solidification. In this case too, due to the entrance of the resin inside the fabric structure, there is the problem that the freedom of the fabric becomes remarkably lower and the feeling of the fiber becomes hard. The hardness of the feel cannot be avoided even with use of soft resins such as a urethane.
Therefore, to solve the above-mentioned problems, in the case of a moisture-permeable waterproof fabric coated with an elastic polymeric substance for use for a windbreaker etc., it has been considered to improve the feeling by controlling the permeation of the elastic polymeric substance into the fabric. As such a method, there are the method of applying hot calendering to the fabric to press the surface of the fabric and smooth it and the method of applying a fluorine compound or other repellent to the fabric in advance so as to prevent permeation (see Japanese Unexamin
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patent: 4318949 (1982-03-01), Okamoto et al.
patent: 4386127 (1983-05-01), Tanaka et al.
patent: 4973510 (1990-11-01), Tanaka
Copy of ROC Office Action dated Jul. 14, 1995 (including English-language translation).
Fukui Minoru
Okajima Shinichi
Yoshida Minoru
Asahi Kasei Kogyo Kabushiki Kaisha
Cole Elizabeth M.
McCamish Marion E.
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