Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-04-17
1997-03-25
Green, Anthony
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
12146D, 36 45, 36 68, 1562733, 156326, 156327, 156332, 156333, 523167, B29C 6500, A43B 2308, A43B 2314, A43B 2316
Patent
active
056140495
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the use of aqueous dispersions of two-phase emulsion graft copolymers as heat-and solvent-activatable binders for stiffening. materials in the textile and leather industry, in particular to their use as binders in shoe caps.
In the textile and leather industry, stiffening backings are very often used for stabilizing the corresponding end products. They are used for shaping and retaining shape. Examples here are hats and shoes. In the case of the latter, the shoe uppers are of interest above all, in particular in the regions of the shoe tips and the heels. In this branch of the industry, stiffening backings are often also called "cap materials" or "shoe caps".
A very large number of possibilities for manufacture and incorporation of appropriate shoe caps are described in the literature. Fiber backings with a thermoplastic as a binder are often used, this polymer in the end often being decisive for retaining the shape. The initially sheet-like materials, that is to say the fiber materials coated or impregnated with binder, are glued to the leather material and then brought into their final shape by means of heat treatment. Ideally, this operation is carried out in one step. According to the prior art, shoe caps are therefore glued to the leather material by the action of heat, and at the same time are brought into their final shape, which they are to retain after cooling. For the purpose of heat-activated gluing, before their shaping the shoe caps are therefore often charged with hot-melt adhesives which can be activated, for example, with microwaves (DE-A 2224967=U.S. Pat. No. 4,069,602).
The use of hot-melt adhesives is often also dispensed with by using as the fiber binder a thermoplastic which, by simultaneous application of heat and pressure, is capable of gluing the shoe caps to the leather: DE-A 4103389 (Derwent Abstract AN 92-269897) describes a process for the production of polyamide-containing shoe caps in which a hot polymer melt is applied to a textile carrier and this is glued with the leather before cooling. EP-B 0102414 (U.S. Pat. No. 4,350,732) likewise mentions shoe caps which can be glued to the shoe material only by heat or solvent activation, without further adhesives. The disadvantage of these caps is their involved and expensive multilayer structure.
Other production processes for shoe caps are claimed in DE-C 3404701 (GB-A 2154859) and DE-C 3447920 (GB-A 2154899). In this process, pulverulent polymers are sintered onto the fiber materials and the materials are further processed accordingly.
However, simple processes in which nonwovens and similar fiber materials, for example paper, woven fabric and knitted fabric, are bonded with the aid of aqueous plastics dispersions and stiffening materials for the textile and leather industry are accessible in this manner, are desirable. In such processes, such as are known, for example, from DE-A 1485579 (Derwent Abstract AN 68-22047) for the production of shoe caps by means of aqueous polymer dispersions, the fiber materials are immersed in the polymer dispersion and dried and the coated fiber materials are initially dissolved by dipping in a solvent before gluing to the substrate, for example shoe upper leather. To improve the adhesiveness, the doctrine in DE-A 1485579 is to employ the plastics dispersion as a mixture with a polymer powder which can easily be initially dissolved. A disadvantage is that the system mentioned in this publication is a two-component system and must be stirred in an extra step before application.
The object was therefore to provide a binder for stiffening materials which is based on aqueous plastics dispersions, in which context it should be possible for the textile carrier materials coated or impregnated therewith to be glued to a substrate not only after initial dissolving with solvent but also after heat treatment. The stiffening materials furthermore should impart to the end product a permanent, shape, hard handle and good edge seam strength. To protect the upper material, the binder shoul
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English Derwent Abstract AN 92-269897 (Aug. 1992).
English Derwent Abstract AN 68-22047Q (Mar. 1969).
Koegler Gerhard
Kohlhammer Klaus
Schwemmer Monika
Green Anthony
Wacker - Chemie GmbH
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