| 摘要 |
A moisture-curable, substantially solvent-free and anhydrous blend of a bituminous material such as asphalt and a liquid prepolymer is disclosed, which blend when cured, results in an elastomer having excellent adhesion to surfaces exposed outdoors. The stability of the blend derives from asphalt being microdispersed in a dispersed phase within a continuous phase of the liquid prepolymer so that particles of asphalt are in the size range from 0.5 mu m to 100 mu m. The asphalt is treated to react all functional groups it may have because they may react with a functional group of the liquid prepolymer. The prepolymer is a polyurethane, a terpolymer of ethylene-propylene-diene, or a silicone. The microdispersion is stably maintained by a compatibilizer having opposed substantially polar and non-polar terminal portions, present in an amount in the range from 0.01 to 5 parts per 100 parts of the blend. The compatibilizer is chosen from (A) an ester of a C2-C12 branched or straight chain polyol; (C) a mono- or diester of a polyether polyol; (D) an ester of a polyester polyol and a C9-C24 fatty acid; (E) an ester of a polyether diol such as a polyalka(C5-C6)diene diol and, a polydimethylsiloxane diol; or, (F) an ester of a polyester polyol having a repeating unit derived from acrylic acid and a polyol selected from the group consisting of a C2-C12 alkylene diol, or triol; a polyalkylene C2-C4 diol; and a polyoxyalkylene C2-C4 diol. |
