Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1994-03-29
1995-07-25
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 61, 528 62, 528 64, 528 65, 558266, 4284231, C08G 1810, C08G 1832, C08G 1860, C07C 6996
Patent
active
054363993
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thermoplastic polyurethane. More particularly, the present invention is concerned with a novel thermoplastic polyurethane, derived from a polytetramethylene carbonate diol, which has excellent resistance to light, oleic acid, hydrolysis and alcohol, so that it is useful as a coating material, an adhesive, a molding latex material and the like. The present invention is also concerned with a coating composition comprising the thermoplastic polyurethane dissolved in an organic solvent therefor, and further concerned with a laminate synthetic leather and an impregnation composite artificial leather which are obtained by processing a fibrous substrate with the coating composition, the leathers exhibiting the above-mentioned excellent resistance properties. Moreover, the present invention is concerned with a novel process for preparing a polytetramethylene carbonate diol which is to be used for preparing such an excellent thermoplastic polyurethane.
BACKGROUND ART
A thermoplastic polyurethane has been appreciated for its excellent properties, such as high toughness, and high resistance to oil and abrasion, etc. The marketability thereof is increasing. However, conventional thermoplastic polyurethanes have drawbacks in that they do not exhibit satisfactory resistance to light, so that they are likely to suffer from being yellowed when used for a prolonged period of time. For example, in the use of molded polyurethane products as articles having a nature of fashion, such as watchbands and the like, the discoloration to yellow is a serious problem. For alleviating this problem of the discoloration occurring with a lapse of time, many of such articles have generally been produced in black color. Further, it has recently been found that when a thermoplastic polyurethane is used as a material for producing articles which are used in direct contact with human skin, such as watchbands, the polyurethane is deteriorated due to the action of oleic acid which is a sebum component contained in sweat. Therefore, it has been recognized that the resistance to oleic acid is an important property for polyurethanes to be used as materials for such articles. Other examples of such articles include automobile parts, such as a steering wheel, gear shift lever and the like.
Furthermore, a polyurethane type coating composition has been appreciated in the field of leathers, such as a laminate synthetic leather and an impregnation composite artificial leather, with respect to the abrasion resistance, feeling to the skin, appearance and the like, so that it has been widely used as materials for a variety of articles, such as shoes, bags, belts, gloves, furniture such as sofas, and automobile seats. However, most of polyurethanes used for these articles are of polyester type or polyether type, thereby causing various problems. For example, in the case of furniture, such as sofas and office chairs, automobile seats and the like, which are used in direct contact with human bodies for a long period of time, the surfaces thereof are deteriorated due to the hydrolysis of the polyester type polyurethane resin, thereby causing the surfaces to be tacky. Furthermore, in extreme cases, a phenomenon is observed such that polyurethane resin layers are deteriorated, so that the resin layers are peeled off from substrates thereof, thereby rendering difficult the use of the articles for a long period of time. With respect to the polyether type polyurethanes, they have excellent resistance to hydrolysis. However, they are poor in resistance not only to oleic acid, but also to alcohol. The resistance to alcohol is an extremely important property in the above-mentioned uses, because, for example, alcohol is usually contained in hairdressing agents. That is, by the use for a long period of time, polyether type polyurethane resin layers formed On articles are deteriorated, thereby rendering the articles useless. For solving these problems, the use of polycarbonate type polyurethanes derived from 1,6-hexan
REFERENCES:
patent: 3426042 (1969-02-01), Hostettler et al.
patent: 3663569 (1972-05-01), Lew
patent: 4440937 (1984-04-01), Krimm et al.
Polymer, vol. 33, No. 7, pp. 1384-1390 (1992).
Polymer, (Korea), Abstract, vol. 14, No. 5, pp. 487-496 (1990).
Kawai Kenzou
Koyama Masaoki
Mori Motoyoshi
Watanabe Tomonari
Asahi Kasel Kogyo Kabushiki Kaisha
Michl Paul R.
Niland Patrick
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