Photographic negative base for self-developing film packs

Claim 2

A low caliper photographic film assembly substantially free of optical pinholes suitable for use as a base for negatives in self-developing photographic film packs, said assembly comprising: (a) a layer of paper, said paper layer being characterized by: (i) a caliper of from about 2.0 mils to about 4.5 mils, and (ii) a basis weight of from about 55 g/m 2 to about 125 g/m 2 ; (b) a first layer of polyolefin extrusion coated on a first surface of said paper layer, said first polyolefin layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 ; (c) a second layer of polyolefin extrusion coated on a second surface of said paper layer, said second polyolefin layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 ; said film assembly containing from about 2.5 g/m 2 to about 4.0 g/m 2 of carbon black, said carbon black being substantially uniformly dispersed in at least two of said layers of said film assembly.

Claim 3

The photographic film assembly of claim 1 wherein the polyolefin is polyethylene.

Claim 4

The photographic film assembly of claim 2 wherein an antistatic layer has been applied to said first layer of polyethylene, said antistatic layer having a maximum surface resistivity of 10 8 ohms at 70° F. and 20% relative humidity.

Claim 5

The photographic film assembly of claim 3 wherein said carbon black is present in said first and second layers of polyethylene.

Claim 6

The photographic film assembly of claim 3 wherein said carbon black is present in said paper layer and said first layer of polyethylene.

Claim 7

The photographic film assembly of claim 5 wherein titanium dioxide pigment is present in said second layer of polyethylene in an amount sufficient to mask said carbon black in said gray paper.

Claim 8

The photographic film assembly of claim 3 wherein the caliper of said assembly is about 5.5 mils.

Claim 9

The photographic film assembly of claim 4 wherein a gelatin subcoating is applied to said second layer of polyethylene.

Claim 10

The photographic film assembly of claim 6 wherein a gelatin subcoating is applied to said second layer of polyethylene.

Claim 11

A low caliper photographic film assembly substantially free of optical pinholes suitable for use as a base for negatives in self-developing film packs, said assembly comprising: (a) a layer of paper, said paper layer being characterized by: (i) a caliper from about 2.0 to 4.5 mils, (ii) a basis weight from about 55 g/m 2 to about 125 g/m 2 , (iii) containing from about 0.15 g/m 2 to about 2.0 g/m 2 of carbon black, (b) a first layer of polyethylene extrusion coated on a first surface of said paper layer, said first polyethylene layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (c) a second layer of polyethylene extrusion coated on a second surface of said paper layer, said second polyethylene being characterized by a weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 1 g/m 2 to about 7.2 g/m 2 of titanium dioxide, (d) an antistatic layer adhered to said first layer of polyolefin, said antistatic layer having a maximum surface resistivity of 10 8 ohms at 70° F. and 20% relative humidity, said film assembly containing a maximum carbon black content of about 4.0 g/m 2 .

Claim 12

A low caliper photographic film assembly substantially free of optical pinholes suitable for use as a base for negatives in self-developing film packs, said assembly comprising: (a) a layer of paper, said paper layer being characterized by: (i) a caliper from about 2.0 to 4.5 mils, (ii) a basis weight from about 55 g/m 2 to about 125 g/m 2 , (iii) containing from about 0.15 g/m 2 to about 2.0 g/m 2 of carbon black, (b) a first layer of polyethylene extrusion coated on a first surface of said paper layer, said first polyethylene layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (c) a second layer of polyethylene extrusion coated on a second surface of said paper layer, said second polyethylene being characterized by a weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 1 g/m 2 to about 7.2 g/m 2 of titanium dioxide, (d) an antistatic layer adhered to said first layer of polyolefin, said antistatic layer having a maximum surface resistivity of 10 8 ohms at 70° F. and 20% relative humidity, said film assembly containing a maximum carbon black content of about 4.0 g/m 2 .

Claim 13

The photographic assembly of claim 10 wherein said first layer of polyolefin further contains up to about 1.5 g/m 2 of titanium dioxide.

Claim 14

The photographic film assembly of claim 10 or 11 wherein a gelatin subcoating is applied to said second layer of polyethylene.

Claim 15

A low caliper photographic film assembly substantially free of optical pinholes suitable for use as a base for negatives in self-developing film packs, said assembly comprising: (a) a layer of paper being characterized by: (i) a caliper from about 2.0 mils to about 4.5 mils, (ii) a basis weight from about 55 g/m 2 to about 125 g/m 2 , (b) a first layer of polyethylene extrusion coated on a first surface of said paper layer, said first layer of polyethylene being characterized by a total weight of from about 10 g/m to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (c) a second layer of polyethylene extrusion coated on a second surface of said paper layer, said second polyethylene layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (d) an antistatic layer adhered to said first layer of polyolefin, said antistatic layer having a maximum surface resistivity of 10 8 ohms at 70° F. and 20% relative humidity. said film assembly containing a maximum carbon black content of about 4.0 g/m 2 .

Claim 16

A low caliper photographic film assembly substantially free of optical pinholes suitable for use as a base for negatives in self-developing film packs, said assembly comprising: (a) a layer of paper being characterized by: (i) a caliper from about 2.0 mils to about 4.5 mils, (ii) a basis weight from about 55 g/m 2 to about 125 g/m 2 , (b) a first layer of polyethylene extrusion coated on a first surface of said paper layer, said first layer of polyethylene being characterized by a total weight of from about 10 g/m to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (c) a second layer of polyethylene extrusion coated on a second surface of said paper layer, said second polyethylene layer being characterized by a total weight of from about 10 g/m 2 to about 48 g/m 2 and containing from about 0.7 g/m 2 to about 3.0 g/m 2 of carbon black, (d) an antistatic layer adhered to said first layer of polyolefin, said antistatic layer having a maximum surface resistivity of 10 8 ohms at 70° F. and 20% relative humidity. said film assembly containing a maximum carbon black content of about 4.0 g/m 2 .

Claim 17

The photographic film assembly of claim 13 wherein each of said layers of polyethylene further contains up to about 1.5 g/m 2 of titanium dioxide.

Claim 18

The photographic film assembly of claim 13 or 14 wherein a gelatin subcoating is applied to said second layer of polyethylene.