Building assembly including a weather resistant barrier, a sheet for use as a weather resistant barrier, a liquid coating composition and methods of making the foregoing
申请人:CERTAINTEED CORPORATION
公开号:US10167627B2
公开(公告)日:2019-01-01
A weather resistive barrier (WRB) for the exterior protection of building substrates can have a water vapor permeability that decreases with increasing temperature. In an embodiment, the WRB includes a coating comprising a LCST polymer, and may further include a second polymer. The WRB can be part of a building assembly, part of a sheet, or a sheet itself, the sheet having an air permeability of less than 0.02 L/(s m2) at a pressure of 75 Pa. Furthermore a liquid coating composition can include a LCST polymer and a second polymer, wherein the liquid coating composition can be adapted that a solid coating formed by the liquid coating composition has an air permeability of less than 0.02 L/(s m2) at a pressure of 75 Pa and a water vapor permeability that decreases with increasing temperature.
用于建筑基材外部保护的耐候屏障(WRB)可以具有随温度升高而降低的水蒸气渗透性。在一个实施例中,WRB 包括一种由 LCST 聚合物组成的涂层,还可进一步包括第二种聚合物。WRB 可以是建筑组件的一部分、板材的一部分或板材本身,板材在 75 Pa 压力下的透气性小于 0.02 L/(s m2)。此外,液态涂层组合物可以包括一种 LCST 聚合物和一种第二种聚合物,其中液态涂层组合物可以使液态涂层组合物形成的固体涂层在 75 Pa 压力下具有小于 0.02 L/(s m2) 的透气性和随温度升高而降低的水蒸气渗透性。