Hot melt sealant and foam-in-place gasketing material

Details Hot melt sealant and foam-in-place gasketing material Hot melt sealant and foam-in-place gasketing material

C - Chemistry, Metallurgy

09

J

C09J 123/10 (2006.01) C09J 121/00 (2006.01) C09J 123/02 (2006.01) C09J 123/14 (2006.01) C09J 123/16 (2006.01) C09J 129/04 (2006.01) C09J 131/04 (2006.01) C09J 133/00 (2006.01)

Patent

CA 2619343

A hot melt sealant and foam-in-place gasket composition based on a rubber such as ethylene propylene rubber (EPR) and/or ethylene propylene diene rubber (EPDM) and at least one semicrystalline olefinic polymer. The hot melt composition includes the rubber or a blend of rubbers in an amount of 5% to 50% by weight, at least one semicrystalline olefinic polymer in an amount of 5% to 40% by weight, at least one amorphous poly-.alpha.-olefm (APAO) polymer in an amount of 0% to 70% by weight, a compatible tackifier in an amount of 0% to 50% by weight, and a plasticizer in an amount of at least 30% by weight. The composition is particularly useful for foamed gasket applications as a replacement for pressure sensitive adhesive (PSA) coated foam tape.

Composition de matériau d'étanchéité thermofusible et de joint d'étanchéité formé par moussage in situ à base de caoutchouc tel qu'un caoutchouc d'éthylène et de propylène (EPR) et/ou un caoutchouc d'éthylène, de propylène et de diène (EPDM) et d'au moins un polymère oléfinique semi-cristallin. La composition thermofusible comprend le caoutchouc ou un mélange de caoutchoucs en quantité de 5 % à 50 % en poids, au moins un polymère oléfinique semi-cristallin en quantité de 5 % à 40 % en poids, au moins un polymère de type poly-.alpha.-oléfine amorphe (APAO) en quantité de 0 % à 70 % en poids, un agent poisseux compatible en quantité de 0 % à 50 % en poids et un plastifiant en quantité d'au moins 30 % en poids. La composition est particulièrement utile pour des applications de joints d'étanchéité expansés telles qu'un remplacement pour une bande d'isolant adhésif autocollant (PSA).

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