Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1988-04-01
1990-09-04
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524296, 524297, 524306, 524474, 524487, 524906, 525 89, 525 92, 525 93, 525 98, 525939, C08L 501, C08L 511, C08L 512, C09J15302
Patent
active
049545507
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to systems for thermoplastic adhesives which have the peculiarity, after application to the surfaces to be glued, of leading to a product which is cross-linked in a substantially irreversible way, making it non-melting or melting only with difficulty. It likewise relates to the preparation of these systems, as well as to a corresponding method of gluing.
The systems for thermoplastic adhesives capable of cross-linking, in accordance with the present invention, have the double advantage of being adapted for use in a very simple manner in industrial installations, especially automated installations (robots) such as those of the automobile industry, and of being capable of application to numerous types of objects made from very diverse materials, such as wood, metals, woven or non-woven textiles, glass, porcelain, ceramics, cardboard, paper, stone, cement and plastics materials. In particular, they present an excellent capacity for adhesion between closed non-porous substrates, such as polystyrene, untreated polyethylene, untreated polyvinyl chloride, the acrylonitrile-butadiene-styrene rubbers, polymethyl methacrylate, glass, metals, surface-treated papers, film-coated papers, papers covered with a layer of varnish hardened by ultra-violet radiation.
This wide field of application of the thermoplastic adhesives according to the present invention deserves to be underlined.
We will mention in particular the specially interesting use of the systems according to the invention for bookbinding. In this field, the gluing methods known to date are:
(1) gluing by means of an aqueous dispersion in one or several applications;
(2) gluing in one or two applications, with the aid of a traditional thermoplastic glue, i.e. a composition which is solid at ambient temperature but which, after melting, hardens by cooling;
(3) mixed adhesion, with an application of vinyl glue and an application of thermoplastic glue; and
(4) gluing with the aid of a thermoplastic polyurethane glue.
Method (1) requires a long drying time; method (2), in the case of a single application, leads to a resistance to tearing out of the pages which is relatively limited both in the cold and in the hot, and in the case of a second application leads to a weak adhesion of the second coat on the first; method (3) suffers from the disadvantage of the length of time needed for drying the vinyl glue, which is in danger of failing to bond well to the thermoplastic glue if not well dried - a thing difficult to control on a machine; as regards method (4) it has the disadvantage that the thermoplastic polyurethane glues remain sticky as long as the cross-linking has not finished, so that during all that period it is not possible to effect the trimming of the books without a risk of fouling; furthermore, the thermoplastic polyurethane glues require an addition of water for cross-linking, which is not easy to add with film-coated book covers and closed laminated papers. With the compositions according to the present invention, the above disadvantages are overcome.
The systems for adhesives according to the present invention are mainly systems with two components (hereinafter called A and B), one containing mainly anhydride groups, and the other containing mainly groups capable of reacting with the latter, once the anhydride rings have been opened. These compounds can, each according to its kind, be melted and maintained in fusion for a relatively long time (a minimum of eight hours: such times being compatible with the exigencies of use on the industrial scale) and can be cooled and re-melted without causing cross-linkage. At the time of use, the two components are contacted in the melted state (by intimate mixing or by depositing a layer of the one on a layer of the other), and the expected cross-linking takes place under the effect of a rise in temperature.
This cross-linking mechanism between open anhydride groups and other reactive groups is known per se, but it has never been applied to industrial adhesive methods. Thus, in Frenc
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Lieberman Allan M.
Societe Chimique Des Charbonnages S.A.
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