Reservoir system for prolonged diffusion of an active principle

Details Reservoir system for prolonged diffusion of an active principle Reservoir system for prolonged diffusion of an active principle

1992-10-01

1998-11-03

Marquis, Melvyn I.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

2065241, 206484, 220454, 222 92, 604408, 6048901, B65D 8300, A61K 900, A01N 2534

Patent

active

058305467

ABSTRACT:
A reservoir system consisting of a nonwoven made from thermoplastic polymer filaments, shaped into a closed bag containing a water-soluble active principle. The bag is intended to ensure a prolonged release, progressing linearly, of the active principle in an aqueous environment. For a given active principle, the desired diffusion kinetics are obtained by adjusting, depending on the availability of the active principle, the surface area of the nonwoven and the degree of hydrophily of the latter. To this end, it is impregnated, either with polysiloxane or a quaternary ammonium salt, or with a perfluorinated compound or an acrylic resin and paraffin.

REFERENCES:
patent: 4207893 (1980-06-01), Michaels
patent: 4209607 (1980-06-01), Shalaby et al.
patent: 4434153 (1984-02-01), Urquhart et al.
Abstract & Partial English Translation of Japanese Patent Publication 1,299,857-A.
Ullmanns Encyklopadie der technischen Chemie, 4th Edition, vol. 21, p. 534 (1982).
Rompp Chemie Lexikon, 9th Edition, vol. 5, pp. 3730-3731 & 4168-4169 (1992).
Ullmann's Encyclopedia of Industrial Chemistry, 5th Edition, vol. A8, pp. 338 & 350 (1987).

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