Substrate for volatile delivery systems

A - Human Necessities – 01 – M

Patent

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Details

A01M 1/20 (2006.01) A01N 25/14 (2006.01) A61L 9/03 (2006.01) A61L 9/12 (2006.01)

Patent

CA 2513404

Volatile impregnated substrates (70), such as wicks and mats, that can be used in a dispensing device that uses a heat source or otherwise uses active (25) means to promote the release of the volatile material (22) from the substrate are disclosed. The preferred substrate has a structure including sand particles adhered together by a binder to form a network of pores and passages. The binder is selected from thermoset polymeric materials and mixtures thereof. A volatile material is disposed in the pores before the substrate (70) is installed in the dispensing device. The impregnated substrate is positioned in the dispensing device on or near the heat source (25) of the dispensing device. The heat source (25) is activated thereby elevating the temperature of the substrate such that volatile material is released from the pores. In one embodiment, the sand particles comprise silica sand and the binder is a cured novolac resin.

L'invention concerne des substrats imprégnés de matériaux volatils (70), tels que des mèches et des mats, qui peuvent être utilisés dans un dispositif de distribution qui utilise une source de chaleur ou des moyens actifs (25) pour favoriser la libération du matériau volatil (22) à partir du substrat. Le substrat préféré présente une structure qui comporte des particules de sable collées les unes aux autres par un liant de façon à former un réseau de pores et de passages. Le liant est choisi parmi des matériaux polymères thermodurcis et des mélanges de ces derniers. Un matériau volatil est disposé dans les pores avant que le substrat (70) soit installé dans le dispositif de distribution. Le substrat imprégné est positionné dans le dispositif de distribution sur la source de chaleur (25) du dispositif de distribution ou à proximité de cette dernière. Lorsque la source de chaleur (25) est activée, la température du substrat s'élève de façon que le matériau volatil soit libéré par les pores. Dans un mode de réalisation, les particules de sable comportent du sable siliceux et le liant est une résine novolaque durcie.

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