Process for preparing high-performance pressure-sensitive...

C - Chemistry – Metallurgy – 09 – J

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C09J 11/00 (2006.01) C08J 3/20 (2006.01) C09J 7/02 (2006.01) C09J 121/00 (2006.01)

Patent

CA 2224775

Pressure-sensitive hotmelt adhesive composition based on non-thermoplastic elastomers, obtained by a) preparing, as the preliminary batch, a composition comprising the elastomers and one or more of the following additives such as fillers, anti-ageing agents, plasticizers and tackifier resins in an intensively shearing, intensively cooling mixer and without solvent, the composition having a final temperature of from 100°C to 160°C, b) mixing and homogenizing the preliminary batch in a second mixer with one or more of the following additives such as fillers, anti-ageing agents, plasticizers and tackifier resins, without solvent, the composition having a final temperature of from 100°C to 160°C, where the total residence time of the composition at temperatures over 100°C does not exceed a figure of 6 minutes, so that the resulting hotmelt adhesive composition has a viscosity of more than 900 Pa*s, in particular from 900 Pa*s to 1200 Pa*s, at 130°C and at a shear gradient of 100 s-1.

Divulgation d'une composition d'adhésif thermofusible sensible à la pression à base d'élastomères non thermoplastiques, obtenue en a) préparant, comme charge préliminaire, une composition comprenant les élastomères et un ou plus d'un des additifs suivants comme matière de charge, des agents antivieillisseurs, des plastifiants et des résines collantes, sans solvant, dans un mélangeur provoquant un cisaillement et un refroidissement intenses, dont la température finale est de 100 à 160 .degré.C , b) mélangeant et homogénéisant la charge préliminaire dans un deuxième mélangeur avec un ou plus d'un des additifs suivants comme matière de charge, des agents antivieillisseurs, des plastifiants et des résines collantes, sans solvant, la composition ayant une température finale allant de 100 à 160 .degré.C, et où le temps de séjour total de la composition à une température supérieure à 100 .degré.C n'est pas supérieur à environ 6 minutes, de manière à ce que la composition thermofusible obtenue ait une viscosité supérieure à 900 Pa*s, en particulier allant de 900 à 1 200 Pa*s, à 130 .degré.C, et un gradient de cisaillement de 100 s-1.

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