发明授权
- 专利标题: Process for providing barrier properties to porous substrates
- 专利标题(中): 为多孔基材提供阻隔性能的方法
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申请号: US10795630申请日: 2004-03-08
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公开(公告)号: US07029725B2公开(公告)日: 2006-04-18
- 发明人: Frank Ralph Pepe , Charles Raymond Hegedus , John Joseph Rabasco
- 申请人: Frank Ralph Pepe , Charles Raymond Hegedus , John Joseph Rabasco
- 申请人地址: US PA Allentown
- 专利权人: Air Products Polymers, L.P.
- 当前专利权人: Air Products Polymers, L.P.
- 当前专利权人地址: US PA Allentown
- 代理商 Mary E. Bongiorno; Russell L. Brewer
- 主分类号: B05D3/02
- IPC分类号: B05D3/02
摘要:
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 1×105 dynes/cm2 at 115° C. measured at 6.28 rad/sec.