Huiling Yang

US Patent:

6528581, Mar 4, 2003

Filed:

Apr 16, 1999

Appl. No.:

09/293301

Inventors:

David Goodro Kelly - Ambler PA
Huiling Yang - Dresher PA
Donald Alfred Winey - Warminster PA

Assignee:

Rohm and Haas Company - Philadelphia PA

International Classification:

C08L 3100

US Classification:

524833, 524832, 5263184, 52631844, 526328, 5263285, 526329, 5263292

Abstract:

The quality of a mastic coating system for bituminous substrates is improved through the use of a topcoat composition and/or tiecoat composition comprising a water-insoluble latex polymer. The latex polymer has a Tg of from -25Â C. to 20Â C. and is prepared from a monomer mixture comprising: (a) at least 20% by weight of at least one hydrophobic monomer selected from the group consisting of (C to C ) alkyl (meth)acrylates; (b) 0 or up to 45% by weight of at least one vinyl aromatic monomer; wherein the weight of (a) and (b) together constitute at least 25% by weight of said monomer mix (c) 0 or up to 75% by weight of at least one monomer selected from the group consisting (C1 to C4) alkyl (meth)acrylates; and (d) 0 or up to 5% by weight of at least one monomer selected from acrylic or methacrylic acid; wherein when (b) is not present in the monomer mix the amount of (d) is in the range from 0 or up to less than 3% by weight. The mastic coating system has increased adhesion and blistering resistance when the coating is exposed to ponded water and may have reduced bleedthrough of chemicals from the bituminous substrate.