Abstract:
A thin, continuous film is formed on a substrate by the ultraviolet surface polymerization of the vapor of an imide containing photopolymerizable organic material. Such films are useful as coatings on metallic and nonmetallic substrates, capacitor dielectrics, cryogenic device insulation, insulation for microelectric devices, insulation on electrically conductive wire, and for corrosion protection.
Abstract:
Continous films are obtained by photopolymerizing on the surface of a substrate a gaseous material selected from hexachlorobutadiene, tetrafluoroethylene, trifluoromonochloroethylene, monofluorotrichloroethylene, hexafluorobutadiene, mixture thereof and acrylonitrile. Preferably ultra-violet light having an effective wave length in the range of 2000 r to 3500 r at a vapour pressure for said gaseous material in the range of 0.1 to 8.0 millimetres is used. Preferably the substrate is cooled during photopolymerization thereby increasing the rate of film formation. An apparatus for carrying out the polymerization is described.
Abstract:
A THIN, CONTINUOUS ADHERENT COATING IS FORMED ON A SUBSTRATE BY ULTRAVIOLET SURFACE PHOTOPOLYMERIZATION OF SODIUM HEPARIN IN THE GASEOUS PHASE. THE RESULTING COATED ARTICLE EXHIBITS ANTI-THROMBOGENIC BEHAVIOR AND IS SUITABLE FOR PROSTHETIC USE.
Abstract:
Capacitors are provided having a first metal substrate, a dielectric film on such substrate and a second electrode on the dielectric film which is made by the photopolymerization of certain photopolymerizable organic materials in vaporous form.
Abstract:
Copolymer films are provided which are made by the surface photopolymerization of vaporous mixture of a diene such as butadiene and a vinyl monomer, for example acrylonitrile. The copolymer films exhibit valuable insulating properties and have a dielectric constant over the range of from about 2.65 to about 5.9.