A polymeric composition in pellet form

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/12 (2006.01) C08L 23/02 (2006.01) C08L 53/00 (2006.01) C08L 53/02 (2006.01) C09J 123/02 (2006.01) C09J 151/00 (2006.01) C09J 153/00 (2006.01) C09J 153/02 (2006.01)

Patent

CA 2239983

A polymeric composition in pellet form comprising a tacky hot melt composition, comprising a) from about 5 % by weight to about 90 % by weight of a thermoplastic polymer, b) from about 10 % by weight to about 65 % by weight of a tackifying resin, c) up to about 50 % by weight of a plasticizer, d) up to about 2 % by weight of an antioxidant, and a pelletizing aid, wherein the tacky hot melt composition is a pressure sensitive adhesive having a storage modulus, G', at about 25 ~C, of less than about 5 x 106 dynes/cm2, and each pellet has a substantially tack-free surface. This invention further discloses a polymeric composition in pellet from suitable for molding articles. The composition comprises a tacky hot melt composition comprising at least one high molecular weight triblock copolymer of the general configuration A-B-A and a plasticizer and a pelletizing aid. The pelletizing aid substantially surroudns the tacky composition such that the molded articles are substantially free from surface tack. A method of forming the pellets is also disclosed.

Cette invention concerne une composition polymère sous forme de granulés qui comporte une composition collante thermofusible contenant a) de 5 % environ à 90 % environ en poids d'un polymère thermoplastique, b) de 10 % environ à 65 % environ en poids d'une résine donnant du collant, c) jusqu'à 2 % en poids d'un agent plastifiant, d) jusqu'à 2 % en poids d'un agent antioxydant et un agent d'agglomération. Dans ladite composition polymère, la composition collante thermofusible est un adhésif autocollant dont le module de conservation, G', à 25 ·C environ, est inférieur à 5x10?6¿ dynes/cm?2¿ environ, et chaque granulé possède une surface sensiblement non collante. Cette invention concerne en outre une composition polymère sous forme de granulés destinée au moulage d'articles. La composition comporte une composition collante thermofusible contenant au moins un copolymère tribloc de poids moléculaire élevé et de structure générale A-B-A ainsi qu'un agent plastifiant et un agent d'agglomération enveloppe sensiblement la composition collante de telle sorte que les articles moulés ne présentent pratiquement pas de surface collante. L'invention se rapporte en outre à un procédé de formation des granulés.

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