Permanent antistatic primer layer
First Claim
1. A method of preparing a silver halide photographic material comprising the steps of:
- (i) stretching a polyester sheet or web first in one direction and second in a direction perpendicular thereto(ii) coating said hydrophobic polyester sheet or web, either before stretching or between said first and second stretching operation, on one or both sides, with a transparent antistatic primer layer, wherein the coating composition of said transparent antistatic primer layer comprises (1) a dispersion of a polythiophene with conjugated polymer backbone and a polymeric polyanion compound and (2) a latex polymer having hydrophilic functionality(iii) coating one or more hydrophilic colloid layer(s), including at least one silver halide emulsion layer, on one or both sides of said hydrophobic polyester sheet or web.
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Accused Products
Abstract
There is provided a method for preparing a biaxially oriented polyester sheet or web, with improved antistatic properties, comprising the steps of
(i) stretching said polyester sheet or web first in one direction and second in a direction perpendicular thereto
(ii) coating said hydrophobic polyester sheet or web, either before stretching or between said first and second stretching operation, on one or both sides, with a transparent antistatic primer layer, wherein the coating composition of said transparent antistatic primer layer comprises (1) a dispersion of a polythiophene with conjugated polymer backbone and a polymeric polyanion compound and (2) a latex polymer having hydrophilic functionality.
The primer layer is coated from an aqueous composition and does not show a substantial change in resistivity depending on relative humidity or wet processing.
112 Citations
16 Claims
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1. A method of preparing a silver halide photographic material comprising the steps of:
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(i) stretching a polyester sheet or web first in one direction and second in a direction perpendicular thereto (ii) coating said hydrophobic polyester sheet or web, either before stretching or between said first and second stretching operation, on one or both sides, with a transparent antistatic primer layer, wherein the coating composition of said transparent antistatic primer layer comprises (1) a dispersion of a polythiophene with conjugated polymer backbone and a polymeric polyanion compound and (2) a latex polymer having hydrophilic functionality (iii) coating one or more hydrophilic colloid layer(s), including at least one silver halide emulsion layer, on one or both sides of said hydrophobic polyester sheet or web. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification