MATRIX FOR RELEASE OF ACTIVE INGREDIENTS

A matrix for delivery of active substances such as fragrances and pheromones into the atmosphere is provided which matrix is active substance permeable (including to hydrophilic substances) and is formed of a copolymer which can be softened sufficiently at temperature between 45 DEG C. and 160 DEG C...

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Bibliographische Detailangaben
Hauptverfasser:	GORNOWICZ, GERALD ALPHONSE, LEE, CHI-LONG
Format:	Patent
Sprache:	eng
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FISHING FORESTRY HUMAN NECESSITIES HUNTING HYGIENE MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METALLURGY METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL ORGANIC MACROMOLECULAR COMPOUNDS PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRAPPING
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Beschreibung
Zusammenfassung:	A matrix for delivery of active substances such as fragrances and pheromones into the atmosphere is provided which matrix is active substance permeable (including to hydrophilic substances) and is formed of a copolymer which can be softened sufficiently at temperature between 45 DEG C. and 160 DEG C. to incorporate the substances therein without damage caused by heat or chemical reactions, the matrix being formed of a substantially linear block copolymer which is a reaction product of a polydiorganosiloxane which forms soft segments in said reaction product and a diisocyanate which forms hard segments, said copolymer having a glass transition temperature between 45 DEG C. and 160 DEG C., said soft segments comprising from 70 to 99 percent by weight, based on the weight of said copolymer, the average molecular weight of the copolymer being between 15,000 and 500,000.