Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Coated or impregnated woven – knit – or nonwoven fabric which... – Coating or impregnation intended to function as an adhesive...
Patent
1995-03-07
1997-07-29
Short, Patricia A.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Coated or impregnated woven, knit, or nonwoven fabric which...
Coating or impregnation intended to function as an adhesive...
427 231, 4272082, 4273899, 525131, 525411, 525412, 525415, 525440, 525445, 525903, 602 2, C08L 3306, C08L 6704, C08L 7504, A61F 501
Patent
active
056520530
DESCRIPTION:
BRIEF SUMMARY
This invention relates to new alloys under various forms of interpenetrating polymer networks (IPN), principally under the form of semi-IPN or thermoplastic IPN, in sheets, plaques or bulk product that are thermomoldable and thermoadhesive, flexible or rigid, with rather short setting time, and to preparation processes of those alloys and to processes for their eventual application on a textile substrate.
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 pretreatment such as heating at an easily accessible temperature. It may also concern a matter one desires to apply between two objects showing uneven surfaces in order to bond them together and where in particular usual adhesives are not suited because there are cavities to fill for example.
Through the preparation treatment for their use, those materials must therefore have an adequate malleability as well as an adhesive potential to themselves and eventually to other bodies. 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, molding, bonding applications must be realized from a pretreatment 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 governed by the application.
A pretreatment 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 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 aging nor preferably to any physical aging.
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.
There are already a few domains of applications of the type of product addressed by this invention where one uses materials that are thermoformable and thermoadhesive or not 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 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 scener
REFERENCES:
patent: 3760034 (1973-09-01), Critchfield
patent: 4326509 (1982-04-01), Usakura
patent: 4404333 (1983-09-01), Watanabe
patent: 4912174 (1990-03-01), Grouiller
A. Earley John F.
A. Earley III John F.
Short Patricia A.
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