Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Coated or impregnated woven – knit – or nonwoven fabric which... – Coating or impregnation specified as porous or permeable to...
Patent
1994-12-22
1997-05-06
McCamish, Marion E.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Coated or impregnated woven, knit, or nonwoven fabric which...
Coating or impregnation specified as porous or permeable to...
4284231, 428913, 427471, 427541, 427337, 427342, 442 86, B32B 2704, B32B 2708, B32B 2712, B05D 500
Patent
active
056269501
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a moisture-permeable, waterproof fabric and its production process. More particularly, the present invention relates to a water-permeable, waterproof fabric having high moisture permeability and water resistance, as well as excellent washing durability and moisture condensation and its production process inhibition.
BACKGROUND ART
Known processed fabrics having moisture permeability and water resistance in the prior art consist of a coating of a polyurethane resin on a fabric and have cells formed in the resin coating, by wet coagulation, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 58-144178.
However, because moisture permeability and water resistance are reciprocal functions, in the above-mentioned prior art where the coating is a polyurethane resin, it is difficult to improve both functions. For example, when the moisture permeability was set at 4,000 g/m.sup.2 /24 hours, it was not possible to obtain a processed fabric having a water resistance pressure of 2,000 mmH.sub.2 O.
In order to improve on this point, the use of a film of a mixture of polyurethane resin and polyamino acid-modified urethane resin which was wet coagulated after mixing is proposed in, for example, Japanese Unexamined Patent Publication (Kokai) No. 60-173178. According to this proposal, a processed fabric is obtained having moisture permeability of at least 7,000 g/m.sup.2 /24 hours and a water resistance pressure of at least 1,500 mmH.sub.2 O.
In addition, the use of a film of a mixture of fluororesin copolymer, composed by using fluororubber for the base polymer, and polyurethane resin which was wet coagulated after mixing is proposed in, for example, Japanese Unexamined Patent Publication (Kokai) No. 2-99671. According to this proposal, a processed fabric is obtained having moisture permeability of 9,000-13,000 g/m.sup.2 /24 hours and a water resistance pressure of at least 1,500 mmH.sub.2 O.
However, in the technology which uses a resin coating composed by mixing the above-mentioned polyamino acid denatured urethane resin and polyurethane resin, although moisture permeability is 4,000-10,000 g/m.sup.2 /24 hours, water resistance pressure is on the order of 3,000-4,000 mmH.sub.2 O. Moreover, in addition to the wear resistance of the resin film being inferior, the washing durability is remarkably inferior. Namely, a decrease in water resistance and separation strength is observed as a result of washing, thus preventing this resin film from withstanding practical use.
In addition, in the technology which uses a resin coating composed by mixing a fluororesin copolymer, composed by using fluororubber for the base polymer, and polyurethane resin, although the moisture permeability is 9,000-13,000 g/m.sup.2 /24 hours, the water resistance pressure was on the order of 2,000-3,000 mmH.sub.2 O. Moreover, when the proportion of fluororesin copolymer is increased, its compatibility with polyurethane resin becomes poor, resulting in inferior workability and productivity.
DISCLOSURE OF THE INVENTION
In order to solve the problems of the prior art as described above, the object of the present invention is to provide an excellent moisture-permeable, waterproof fabric in which rotting and leakage do not occur even when work is performed in environments of strong wind and rain as well as during strenuous exercise. Moreover, the object of the present invention is to provide a moisture-permeable, waterproof processed fabric having excellent workability and productivity wherein washing durability is excellent and there is good compatibility between a fluorine-containing polyurethane resin and a polyurethane resin during processing and a preparation process.
Thus, the present invention provides a moisture-permeable, waterproof fabric comprising a textile fabric and a resin coating containing a fluorine-containing polyurethane resin and polyurethane resin having a low degree of polymerization on at least one side of said textile fabric.
In addition, the present invention al
REFERENCES:
patent: 4079028 (1978-03-01), Emmons et al.
patent: 4834764 (1989-05-01), Deiner et al.
Japan Kokai H3-8874, translated copy, Jan. 16, 1991.
Japan Kokai 3-27184, translated copy, Feb. 5,1991.
Japan Kokai 2-104771, translated copy, Apr. 17,1990.
Chatani Hideki
Hara Dai
Mukai Masashi
Shimano Yasunao
Takashima Kazuhiko
Choi Kathleen L.
Komatsu Seiren Co., Ltd.
McCamish Marion E.
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