Hot melt adhesive having controllable water solubility

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 179/02 (2006.01) C09J 7/04 (2006.01) D21H 17/56 (2006.01)

Patent

CA 2347291

A water sensitive hot melt adhesive composition based on polyalkyleneimine copolymers for use with articles such as paper products, disposable nonwoven products, tapes, labels and packaging materials. By varying the amount of copolymer included in the composition as well as by varying the chain structure and the ratio of soluble versus insoluble repeating units in the copolymer, an adhesive may be formulated to modify the degree of solubility from 100 % to 0 % soluble in water and/or other performance characteristics. The adhesive composition includes about 10 % to about 70 %, by weight, of a polyalkyleneimine copolymer or a bland of one or more polyalkyleneimine copolymers; about 0 % to about 70 %, by weight, of a tackifying resin; about 10 % to about 70 %, by weight, of a compatible plasticizer; and about 0.1 % to about 3 % by weight of one or more antioxidant. The adhesive maintains the article in an assembled condition by providing adequate adhesive bond strength during normal use, but dissolves in the presence of water thereby permitting the article to be recycled or otherwise disposed of in an environmentally friendly manner.

La présente invention concerne une composition de colle thermofusible sensible à l'eau,à base de copolymères de polyalkylèneimine, qui est destinée à des articles tels que produits en papier, articles non tissés jetables, rubans adhésifs, étiquettes et matériaux de conditionnement. En jouant sur la teneur en copolymère de la composition ainsi que sur la structure en chaîne et sur le rapport entre unités récurrentes solubles et unités récurrentes insolubles du copolymère, on peut faire varier le degré de solubilité dans l'eau de 100 % à 0 % et modifier d'autres caractéristiques fonctionnelles. Cette composition adhésive comprend de 10 à 70 % en poids environ d'un copolymère de polyalkylèneimine ou un mélange d'un ou de plusieurs copolymères; de 0 % à 70 % en poids environ d'une résine donnant du collant; de 10 % à 70 % en poids environ d'un plastifiant compatible; et de 0,3 % à 3 % en poids environ d'un ou de plusieurs antioxydants. Cette colle offre une résistance d'adhésion suffisante pour maintenir l'article à l'état assemblé pendant son utilisation normale, mais se dissout en présence d'eau, ce qui permet de recycler ledit article ou de l'éliminer d'une manière écologique.

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