Patent ID: 7910513
Filing Date: 2011-03-22
Classification: B01J,B32B,Y10T

Abstract:
1. A photocatalyst sheet comprising: a substrate made of glass fiber, a coated layer made of polytetrafluoroethylene (PTFE) coated on both sides of said substrate, and a photocatalyst-containing layer coated on at least one side of said coated layer, wherein said photocatalyst-containing layer contains tetrafluoroethylene-hexa-fluoropropylene copolymer (FEP) and apatite-coated photocatalyst particles having low water solubility, said photocatalyst particles contain titanium oxide, and said apatite is either of apatite hydroxide, apatite carbonate, apatite fluoride, or apatite chloride, or a mixture thereof, the particle diameter of said photocatalyst particles is 1 nm to 100 nm, the ratio of said apatite-coated photocatalyst particles to said photocatalyst-containing layer is 10-40 weight %, the coating quantity of said apatite coated on said photocatalyst particles is such that the weight loss ratio of the whole of said photocatalyst sheet is 10% or less when ultraviolet light of intensity of 18 mW/cm the water contact angle of said photocatalyst sheet surface is 130 degrees or less, whereby said coated layer can be peeled from said substrate when a pair of said photocatalyst sheets are mutually thermally welded to form a welded part and when said welded part is peeled off by a peeling test at the rate of 50 mm/min.