Process for providing barrier properties to porous substrates

Details Process for providing barrier properties to porous substrates Process for providing barrier properties to porous substrates

C - Chemistry, Metallurgy

04

B

C04B 41/48 (2006.01) B05D 5/00 (2006.01) B27K 3/15 (2006.01) B27K 3/50 (2006.01) C09D 123/08 (2006.01) C09D 131/04 (2006.01)

Patent

CA 2499040

The invention relates to an improvement in a process for imparting barrier properties to porous substrates, such as, concrete, masonry products, and wood products. The process comprises the steps of: applying an aqueous based sealing composition comprising a polymeric resin to said porous substrate, evaporating the water and forming a water repellent coating of said polymeric resin on said porous substrate. The improvement comprises: deriving the polymeric resin from an aqueous based polymer emulsion comprising a polymer comprised of emulsion polymerized units of vinyl acetate and ethylene, preferably with a carboxylic acid monomer, the polymer containing amorphous and crystalline ethylene segments and having: (a) a crystalline melting point (T m) ranging from 35 to 110 °C, preferably 50 to 100 °C; measured at a heat rate of 20 °C/minute; and, (b) a tensile storage modulus of at least 1 × 10 5 dynes/cm2 at 115 °C measured at 6.28 rad/sec.

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