C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 33/06 (2006.01) C08J 7/04 (2006.01) C08L 25/00 (2006.01) C09D 125/00 (2006.01) C09D 133/06 (2006.01) E04D 5/02 (2006.01) C09K 3/10 (2006.01)
Patent
CA 2270318
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 -25°C to 20°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 (C8 to C24) 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.
Kelly David Goodro
Winey Donald Alfred
Yang Huiling
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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