Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-03-07
1996-07-16
Bell, James J.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
427243, 427381, 428 357, 428 359, 428 368, 428109, 428131, 428137, 428247, 428253, 602 41, 602 1, 604304, B29D 2200
Patent
active
055365442
DESCRIPTION:
BRIEF SUMMARY
This invention relates to new composite combinations, in sheets, plaques, strips or laminates that are thermomalleable and thermoadhesive to themselves, flexible or rigid, with rather short setting time, and to preparation processes of those composite combinations.
Besides usual applications of plastics, there are various potential domains of applications wherein it is required to realize at every occasion a unique part or assembly with a material that one desires to mold, form or shape preferably manually and with a simple pre treatment such as heating at an easily accessible temperature.
Through the preparation treatment for their use, those materials must therefore have an adequate formability as well as an adhesive potential to themselves. The herein envisioned preparation treatment is limited to a temperature conditioning which will be detailed later, excluding the use of any solvent or external adhesive.
The application being in view can bear on an object or a creation as rigid as possible or one can seek in the application for some degree of flexibility to be selected according to the situation.
Such applications are often sought by individuals having not necessarily a great dexterity, who are willing to practice themselves without sophisticated technical means, realizing the molding, the shaping or the assembly principally by hand with the eventual help of a few simple tools such as scissors, clamps and holders. Obviously, the applications in view here can also be practiced by professionals operating in an industrial environment but that is not required.
As a result those forming and laminating applications must be realized from a pre-treatment temperature that remains accessible without risk of burns or other disadvantage that may cause clumsiness or an accident.
The used material must lose its adhesive property once it returns to ambient temperature and also keep the shape it was given and it must be capable to withstand mechanical stresses to which it may be exposed and not lose its shape up to a temperature as high as possible governed by the application.
A pre-treatment temperature range from 40.degree. C. to 80.degree. C. seems to be suitable, In any case under 100.degree. C. so that such preparation can be done easily and relatively quickly by using hot water for example. It makes sense that alternative heating sources can be used also such as the thermal oven, the heat gun or the microwave oven.
Considering the applications in view, it is also recommended that those materials are inert and do not release substances that are toxic, irritating or with another noxious character so that the user can apply them without any particular safety mean.
Those products must also be stable for a long period of time without being subject neither to chemical ageing nor preferably to any physical ageing.
Therefore it should not be necessary to have to use sophisticated packaging such as hermetically sealed pouches subjected to tearing and that compromise the use of the material once the pouch has been opened as it can be the case in the application of the european patent 0 413 399 A1.
There are already a few domains of applications of the type of product addressed by this invention where one uses composites that are thermoformable and thermoadhesive as from a temperature of treatment from about 70.degree. C. to 80.degree. C. and that are essentially restricted to uses where a high rigidity is looked for. This concerns principally the physiotherapy where splints, orthoses and other means of rigid support are already made like that, the orthopedics interested with said thermoplastic bandages for cylindrical casting or with external prostheses made of same material, but also the field of decoration where stage scenery, masks and various objects essentially in three dimensions are made like that by laminating 2 or more layers.
In order to obtain the effect of formability and adhesiveness in the desired temperature range, one has principaly linear polymers of cyclic esters characterized by "COO" moieties apart o
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patent: 4143655 (1979-03-01), Custer et al.
patent: 4273115 (1981-06-01), Holland et al.
patent: 4316457 (1982-02-01), Liegeois
patent: 4326509 (1982-04-01), Usuhura
patent: 4454873 (1984-06-01), Laufenberg et al.
A. Earley John F.
A. Earley III John F.
Bell James J.
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