Abstract Improved adherence is obtained for sheet material having a hydrophobic film support or base, such as a hydrophobic cellulose ester or poly ester, by the combination of a vinyl polymer subbing layer arranged directly on the hydrophobic support, the subbing layer being formed of a copolymer containing at least 45% by weight of vinylidene chloride and/or vinyl chloride monomer along with a minor amount of a hydrophilic vinyl monomer with the balance being constituted by any other vinyl monomer, and superimposed upon the vinyl subbing layer a layer containing a mixture of gelatin with a copolymer of butadiene and a vinyl monomer containing 30-70% by weight of butadiene, the ratio of the gelatin to the butadiene copolymer being in the range of 1:3 to 2:1 by weight. An additional layer can be applied over the gelatin/copolymer layer and constituted by such ingredients as are desirable for the particular utility of the resultuant sheet material, such as electrophotographic layers containing finely divided photoconductive material such as zinc oxide or some other photosensitive semi-conductive material, mat layers containing pigment, diffusion transfer layers containing development nuclei and so on. Alternately, the ingredients appropriate to some particular ultimate utility can be incorporated into the gelatin/butadiene copolymer layer directly.
Sheet material according to claim 1 wherein said first layer is formed from a dried solution of a copolymer of vinylidene chloride, N-tert.butyl acrylamide, n-butyl acrylate and N-vinyl pyrrolidone.
Claim 2
Dependent Claim
41 words
Sheet material according to claim 1 wherein said second layer is formed from a dried mixture of gelatin and a latex of a copolymer of butadiene and at least one acrylonitrile, styrene, acrylic acid esters, methacrylic acid esters, or acrolein monomer.
Claim 3
Dependent Claim
17 words
Sheet material according to claim 1 wherein said photoconductive compound is photoconductive zinc oxide or titanium dioxide.
Claim 4
Dependent Claim
16 words
Sheet material according to claim 1 wherein the hydrophobic film support is a cellulose triacetate film.
Claim 5
Dependent Claim
29 words
Sheet material according to claim 1 wherein the hydrophobic film support is a polyethylene terephthalate film which is biaxially oriented before or after application of the first layer thereto.
Claim 6
Dependent Claim
34 words
Sheet material according to claim 1 wherein the first layer is applied to a polyethylene terephthalate film oriented in only one direction, which is then oriented in a direction perpendicular to the first one.
Claim 7
Dependent Claim
29 words
Sheet material according to claim 1 wherein said photoconductive particles are dispersed in a further layer of an electrically insulating binder situated in exterior relation to said second layer.
Claim 8
Dependent Claim
30 words
Sheet material according to claim 7 wherein an additional layer comprising an electroconductive substance is interposed between said second layer and said further layer having the photoconductive particles dispersed therein.
Claim 9
Dependent Claim
16 words
Sheet material according to claim 1 wherein said photoconductive particles are dispersed in said second layer.