Improved anionic bituminous emulsions

Details Improved anionic bituminous emulsions Improved anionic bituminous emulsions

C - Chemistry, Metallurgy

08

L

C08L 95/00 (2006.01)

Patent

CA 2212545

This invention relates to rapid set, medium set, and slow set anionic emulsions prepared from straight bitumen or bitumen modified by the incorporation of polymers, solvents, or polymer latices. Particularly, the invention relates to improved methods for enhancing adhesion between the asphalt and the aggregate in anionic solventless and solvent-containing bituminous emulsions wherein the emulsifiers are alkali earth salts of tall oil fatty acids, fortified tall oil fatty acids, tall oil rosin and fortified rosin as well as combinations of kraft lignin and nonionic emulsifiers. The adhesion promoters utilized in these improved methods are the reaction products of styrene (.alpha.-methyl styrene)-acrylic (metacrylic) acid polymers with polyalkylene amines. Further improvement can be obtained by using tall oil fatty acid or fortified tall oil fatty acids as co-reactants in the production of the polyamidoamine products.

Émulsions anioniques à prise rapide, moyenne et lente, préparées à partir de bitumes bruts ou de bitumes modifiés par incorporation de polymères, de solvants ou de latex polymériques. L'invention porte notamment sur des méthodes plus efficaces pour améliorer l'adhérence entre l'asphalte et l'agrégat dans les émulsions bitumineuses anioniques, avec ou sans solvant, les émulsifiants étant des sels de métaux alcalino-terreux d'acides gras de tallöl, d'acides gras de tallöl fortifiés, de colophane de tallöl et de colophane fortifiée, ainsi que des combinaisons de thiolignine et d'émulsifiants non ioniques. Les promoteurs d'adhérence utilisés dans ces méthodes améliorées sont les produits de réaction de polymères de styrène (alpha-méthylstyrène)-acide acrylique (méthacrylique) avec des polyalkylèneamines. Mieux encore : l'emploi d'acide gras de tallöl ou d'acide gras de tallöl fortifié, comme coréactifs dans la production de polyamidoamines.

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