Hot melt desiccant matrix composition based on plasticized...

C - Chemistry – Metallurgy – 09 – J

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C09J 123/14 (2006.01) C09J 11/04 (2006.01) E06B 3/66 (2006.01)

Patent

CA 2698373

A hot melt desiccant matrix composition has an organic binder and an absorbent material as components thereof. The organic binder includes about 10% to 80% by weight of a propylene based poly- .alpha.-olefin polymer having a melting point or a glass transition temperature less than 180 0C, a density in the range of 0.85 to 0.95 g/cc or a blend of poly-.alpha.-olefin polymers; about 5% to 70% by weight of a plasticizer having a flash point equal to or greater than 180 0C; about 0% to 50% by weight a compatible tackifier; and a stabilizer in the amount of about 0% to 5% by weight. The absorbent component may be a water/moisture absorbing material, or a VOC absorbing material, or a blend of water/moisture absorbing and VOC absorbing materials. The absorbent material is selected from absorbing materials including, but not limited to, silica gels, activated carbons, silica alumina, calcium sulfate, calcium oxide, natural zeolites and molecular sieves and the mixtures thereof. The ratios of organic binder component to absorbent component range from about 30% by weight to about 80% by weight.

L'invention concerne une composition de matrice de dessiccatif thermofusible comprenant un liant organique et une matière absorbante en tant que composants de celle-ci. Le liant organique comprend environ 10 % à 80 % en poids d'un polymère de type poly(a-oléfine) à base de propylène ayant un point de fusion ou une température de transition vitreuse inférieure à 180 °C et une densité comprise dans la plage de 0,85 à 0,95 g/cm3 ou d'un mélange de polymères de type poly(a-oléfines) ; environ 5 % à 70 % en poids d'un plastifiant ayant un point d'éclair supérieur ou égal à 180 °C ; environ 0 % à 50 % en poids d'un agent poisseux compatible ; et un stabilisant en quantité d'environ 0 % à 5 % en poids. Le composant absorbant peut être une matière absorbant l'eau/l'humidité ou une matière absorbant les COV ou un mélange de matières absorbant l'eau/l'humidité et les VOC. La matière absorbante est sélectionnée parmi des matières absorbantes comprenant des gels de silice, des charbons actifs, la silice-alumine, le sulfate de calcium, l'oxyde de calcium, des zéolites et tamis moléculaires naturels et des mélanges de ceux-ci, entre autres. Les proportions du composant liant organique par rapport au composant absorbant vont d'environ 30 % en poids à environ 80 % en poids.

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