Polypropylene-based adhesive compositions

Details Polypropylene-based adhesive compositions Polypropylene-based adhesive compositions

C - Chemistry, Metallurgy

09

J

C09J 123/14 (2006.01) C08F 210/16 (2006.01) C09J 123/10 (2006.01) C08F 210/06 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2395532

An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one C4 to C20 .alpha.-olefin, the copolymer having a weight average molecular weight (Mw) from about 15,000 to about 200,000; a melt index (MI) from about 7dg/min to about 3000 dg/min as measured by ASTM D 1238(B), and a (Mw/Mn) of approximately 2. Various production processes are also described. Also described are adhesive compositions and methods for making adhesive compositions having polymers or polymer blends with melt flow rates (MFRs) equal to and above 250 dg/min at 230NC. Certain specific embodiments of the invention involve the use of a free radical initiator, e.g., a peroxide.

L'invention concerne un mélange adhésif qui peut contenir un copolymère semi-cristallin de propylène et au moins un comonomère choisi dans le groupe constitué par l'éthylène et au moins une oléfine C¿4?-C¿20? .alpha., le copolymère ayant une masse moléculaire moyenne en poids (Mw) comprise entre environ 15.000 et environ 200.000; un indice de fusion (MI) compris entre environ 7dg/min et environ 3000 dg/mim mesuré par ASTM D 1238(B), et un rapport (Mw/Mn) d'environ 2. L'invention concerne également différents procédés de production. L'invention concerne également des compositions adhésives et des méthodes de fabrication de compositions adhésives comprenant des polymères ou des mélanges polymères ayant des taux de fluidité (MFRs) égaux ou supérieurs à 250 dg/min. à 230NC. Certains modes de réalisation spécifiques selon l'invention impliquent l'utilisation d'un initiateur de radicaux libres, par exemple un peroxyde d'hydrogène.

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