Adhesion enhancers for anionic bituminous emulsions

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 95/00 (2006.01)

Patent

CA 2214915

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 such as styrene butadiene rubbers (SBR), styrene block copolymers (SBS), ethylene vinyl acetate copolymers (EVA), and other suitable modifiers. The invention also relates to emulsions modified by the incorporation of solvents (such as diesel oil or kerosene) or by the addition of polymer latices (such as SBR-latex or natural rubber latex). More particularly, the invention relates to improved methods for enhancing adhesion between asphalt and 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 novel adhesion enhancers utilized in these improved methods are the condensation reaction products of polyalkylene polyamines with a blend of polymerized linoleic acids and styrene (.alpha.-methyl styrene)-acrylic (metacrylic) acid copolymers.

L'invention porte sur des émulsions anioniques à prises rapide, moyenne ou lente, préparées à partir de bitumes bruts ou de bitumes modifiés par incorporation de polymères, comme des caoutchoucs styrène-butadiène (SBR), des copolymères de styrène-butadiène (SBS), des copolymères d'éthylène et d'acétate de vinyle (EVA), et d'autres modificateurs appropriés. L'invention porte aussi sur des émulsions modifiées par incorporation de solvants (comme le carburant diesel ou le kérosène) ou par addition de latex polymériques (comme le latex SBR ou le latex de caoutchouc naturel). Plus précisément, l'invention porte sur des méthodes améliorant l'adhérence entre l'asphalte et l'agrégat dans des émulsions bitumineuses anioniques, avec ou sans solvant, où les émulsifiants sont des sels de métaux alcalino-terreux d'acides gras de tallöl, des acides gras de tallöl fortifiés, de la colophane de tallöl, fortifiée ou non, ou encore des combinaisons de thiolignine et d'émulsifiants non ioniques. Les nouveaux agents améliorés d'adhérence de ces méthodes sont les produits de réaction de condensation de polyalkylène- polyamines avec un mélange d'acides linoléiques polymérisés et de copolymères de styrène (alpha-méthylstyrène) et d'acide (méth)acrylique.

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