Substantially solvent-free, stable dispersion of a bituminous ma

Details Substantially solvent-free, stable dispersion of a bituminous ma Substantially solvent-free, stable dispersion of a bituminous ma

1992-03-27

1994-06-07

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 64, 524 70, 524284, 524589, 524590, 524705, 524848, 524871, 525127, 25218214, 25218218, 2521822, 25218222, 106277, C08L 9500

Patent

active

053190084

ABSTRACT:
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 C.sub.2 -C.sub.12 branched or straight chain polyol; (C) a mono- or diester of a polyether polyol; (D) an ester of a polyester polyol and a C.sub.9 -C.sub.24 fatty acid; (E) an ester of a polyether diol such as a polyalka(C.sub.5 -C.sub.6)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 C.sub.2 -C.sub.12 alkylene diol, or triol; a polyalkylene C.sub.2 -C.sub.4 diol; and a polyoxyalkylene C.sub.2 -C.sub.4 diol.

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