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
1995-11-06
1998-09-08
Jagannathan, Vasu
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...
524376, 524504, 524505, 427 23, 604292, 128844, 424405, C08K 519, C08L 8304, A01N 2504
Patent
active
058046283
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to elastomer films in which there are uniformly dispersed, in the form of liquid droplets, active chemical substances such as anticorrosive agents, lubricants or else biocides for medical use; it also covers the processes of preparation and the various applications of these films.
The present invention also relates to stable emulsions comprising a continuous phase made up of a solution of elastomer in an organic solvent and a disperse phase including an active chemical substance in a solvent that is not miscible with the solution of elastomer, which are capable of being converted into elastomer films, and to the process for their preparation.
The various elastomer materials usually employed in the medical or paramedical field (especially hygiene) can be modified, so as to be used in combination with active chemical substances which have a protective action, when these materials are employed (gloves, fingerstalls, protective sheaths, tapes and various dressings).
In fact, both in the cases of examination or surgical intervention or in odontology, and for the protection against pathogenic agents such as, for example, bacteria, viruses and fungal spores, a rupture or even sometimes merely the pores or a crack in the elastomer membrane can give rise to a contamination of the carrier of the said material, the use of which is thus not free from risk, especially since in the practice of these occupations, pricks with syringes, suture needles, a trocar, bone fragments and the like take place relatively frequently.
Various treatments have been proposed in order to try to reduce the risk margin in the use of products manufactured with these elastomer materials: plasticizer for the latter; however, in this case the liquid is not very available as such, since it is bonded to the elastomer. Moreover, in the case where part of this chemical substance is not bonded to the elastomer, the liquid containing the said chemical substance, which is not bonded, can give rise to a macroscopic phase separation and to migration phenomena in the course of time; moreover, the liquid concentrates in some regions, thus leaving a whole surface of the elastomer without active substance; not integrally joined; in this case it no longer acts as a plasticizer and exhibits a greater availability. However, such a treatment has the disadvantage of placing the active substance in direct contact with the elastomer, which affects the latter by destroying its mechanical properties and therefore, consequently, its imperviousness. Moreover, the liquid present between the two sheaths tends, when friction takes place, to collect in a single place, also leaving a whole surface of the material without active substance (U.S. Pat. No. 2,586,674); microencapsulated liquid into an elastomer material, either between two layers of elastomer material (Application EP 306 389) or into the elastomer material (International Application WO 93/02668). The use of microcapsules makes the liquid effectively available as such; however, the walls of the microcapsules may be found difficult to pierce and in some cases they modify the mechanical properties of the elastomer.
Consequently, in continuing its research, the Applicant Company set itself the objective of developing an elastomer material which does not exhibit the disadvantages of the materials filled with active chemical substance of the prior art, especially: both in the case of tearing and merely by means of rubbing, in the form of stabilized fine droplets, uniformly in the whole of the said material, the liquid not being concentrated in some regions of the latter, and
The subject of the present invention is an elastomer film including an active chemical substance in liquid form, which film is characterized in that it includes a dispersion of droplets of a solvent b which is not miscible with the elastomer, laden with at least one active chemical substance (solution or dispersion), which dispersion is stabilized by a block or graft copolymer comprising at least polyB blocks which a
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Busnel Rene Guy
Cheymol Andre
Riess Gerard
Guarriello John J.
Hutchinson
Jagannathan Vasu
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