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

2006-04-18

2006-04-18

Cameron, Erma (Department: 1762)

Coating processes

With post-treatment of coating or coating material

Heating or drying

C427S393400, C427S393600, C427S397000

Reexamination Certificate

active

07029725

ABSTRACT:
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 (Tm) 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 1×105dynes/cm2at 115° C. measured at 6.28 rad/sec.

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