Articles coated with synergistic anti-fog coatings based on hydrophillic polymers and organosiloxane- oxyalkylene block copolymers

Claim 1

A normally fogging transparent or reflecting substrate having on at least one surface thereof a non-fogging water insoluble hydrophilic coating comprising: (1) a hydrophilic acrylate or methacrylate polymer selected from the group consisting of polymers of hydroxy lower alkyl acrylates, hydroxy lower alkyl methacrylates, hydroxy lower alkoxy lower alkyl acrylates and hydroxy lower alkoxy lower alkyl methacrylates and (2) in an amount sufficient to synergistically improve the anti-fog activity of the hydrophilic polymeric compound of an organo-siloxane-oxyalkylene block copolymer comprising (a) at least one siloxane block containing at least two siloxane units represented by the formula: R.sub.b SiO.sub.(4.sub.-b) /2 whrein R contains from one to about 20 carbon atoms and is selected from the group consisting of monovalent hydrocarbon groups, halogen-substituted monovalent hydrocarbon groups, and divalent hydrocarbon groups and b has a value from 1 to 3 inclusive, said siloxane block containing at least one of said siloxane units wherein at least one R group is a divalent hydrocarbon group, and (b) at least one oxyalkylene block containing at least four oxyalkylene groups represented by the formula--R'O--, wherein R' is an alkylene group containing from two to about 10 carbon atoms, said siloxane oxyalkylene blocks being interconnected by said divalent hydrocarbon group.