| 摘要 |
1,179,563. Coated foil. MINNESOTA MINING & MFG. CO. 2 Jan., 1967 [3 Jan., 1966; 17 Jan., 1966], No. 150/67. Heading B2E. [Also in Divisions C3 and G2] A polymeric foil is primed with a layer to render the material receptive to further layers of material which is normally poorly adherent thereto which comprises a homogeneous blend of (I) an unsaturated film forming polyester and (II) an epoxidised rubber polymer, e.g. epoxidised cis-polybutadiene or epoxidised polymers of butadiene with styrene or acrylonitrile. The epoxidised polymer may have an epoxide equivalent of 80-200. I and II may be present in a weight ratio of 20:80 to 80:20. Examples of polymeric foils are polyethylene terephthalate, polyvinyl chloride and cellulose acetate. The second coating may be a normally tacky and pressure sensitive adhesive, e.g. an acrylate/acrylic acid copolymer a butyrated urea-formaldehyde resin, or a gelatin silver halide emulsion in which case the primer layer may also comprise from 0.3 to 30% by wt. of total solids of an aldehyde containing hardener for photographic emulsions. The primer layer may contain a peroxide curing catalyst; it may be spread on to the substrate in the form of a dilute solution in an organic solvent, e.g. methyl ethyl ketone. |
