Abstract: A process for producing high grade polyethylene paper on conventional continuous wet-lay papermaking equipment. In particular, the process comprises preparing a furnish of 75-99 wt. % oriented polyethylene pulp, 0.5-15 wt. % fibrous stabilizing agent and 0.5-10 wt. % strengthening agent and depositing the furnish on the forming screen of a conventional wet-lay papermaking machine. The resulting waterleaf sheet is dried on heated drying cans and then thermally bonded to provide a high grade polyethylene paper having high dry strength and toughness, exceptional dimensional stability and superior uniformity (i.e., no holes). The high grade polyethylene paper made by the inventive process is particularly useful in microfiltration end-uses such as vacuum cleaner bags.

Abstract: A process for coating tin oxide with platinum which comprises soaking a tin oxide substrate in a strong caustic solution to activate the substrate, washing the substrate to remove all caustic solution, immersing the washed substrate in an alkaline solution containing Pt(OH).sub.6.sup..dbd. ions applying an electric potential of +0.1 to +0.7 volt to the immersed substrate, and recovering the substrate having a coating of platinum. This process is useful in preparing active platinum-coated catalysts using very small amounts of platinum.