US 5,670,562 A · Adhesion enhancers for anionic bituminous emulsions

Abstract

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.

Claims8

Dependent claims

An improved method for enhancing adhesion between asphalt and aggregate in anionic bituminous emulsions wherein the improvement comprises the addition to the emulsion of a composition which comprises the polyamidoamine condensation reaction products of:

A) 50-80 wt. % of a mixture comprising
1) 50-95 wt. % of a blend consisting essentially of
a) 50-70 wt. % C-36 dimer acid and
b) 50-30 wt. % of a member selected from the group consisting of C-54 trimer, higher molecular weight polycarboxylic homologues, and combinations thereof, and
2) 50.5 wt. % of the styrene-acrylic acid copolymer reaction product formed by reacting in a radical polymerization reaction
a) 1-99 wt. % of a member selected from the group consisting of .alpha.-methyl styrene, styrene, and combinations thereof,
b) 99-1 wt. % of a member selected from the group consisting of acrylic acid, metacrylic acid, alkyl esters of acrylic acid, alkylesters of metacrylic acid, and combinations thereof, and
c) a catalytic amount of a radical polymerization initiator;
with
B) 50-20 wt. % of polyalkylene polyamine.

7 more elements

Dependencies are inferred from the claim text.

Adhesion enhancers for anionic bituminous emulsions

Life of this patent

Adhesion enhancers for anionic bituminous emulsions

Life of this patent

Abstract

Claims8