Agfa Patent 1976
I was sure that I had a simple subbing formula copied from a book I read, but damned if I can find it.
I also find some of the formulas complex:
Agfa patent UK 1976 11216 or EP0003627 A1
demin H2O 2460ml
disodiumhydrogen phospate 6.3g
xitric acid 20.4g
ammonium sulphate 72g
aqueous colloidal solution of silica 888ml
demin H2O 939ml
6N sulfuric acid to bring ph to 3 21.1ml
20% aqueous solution of formaldehyde 576ml
add B to A at 40 degrees C, stirring at 6000 rpm for 2 hours. Add C. stir 15min. decrease rpm to 3000 for 2 hours at 40 degrees C
change ph to 6 with 110ml 2N sodium hydroxide and 300g gelatine stir 300rpm for 1 hour!
Other interesting Patents
(1) Applying a first coating comprising a dilute aqueous solution of a polyvalent metal salt selected from the group consisting of ferric, stannic, stannous, chromic, and zirconium salts plus a polymer film swelling agent to the polymer film support;
(2) Drying and curing this first coating to form a first subbing layer;
(3) Applying a second coating comprising an aqueous gelatin solution containing a polyvalent metal salt selected from the group consisting of ferric, stannous, stannic, chromic, and zirconium salts plus a polymer film swelling agent to the first subbing layer; and
(4) Drying and curing this second coating to form a second subbing layer.
This one confirms the use of latex:
A sample of photographic baryta coated paper stock was coated on both sides with a 15 g./m. coating of 50:50 solids blend of polystyrene latex and styrenezbutadiene (60:40) latex. This coated paper was very hydrophobic to water and showed a moisture pickup (Cobb test) of approximately 0.02 g./ 100 cm. after 8 minutes exposure to water at 70 F. A 1.0 g./rn. sub coating of the following composition was then coated over the face side resinous layer.
Material: Weight, gms. Water 907.9 Chelating agent 2.5 Wet-ting agent 1.5 Sodium meta-borate 2.0 Casein 7.6 Polystyrene latex (32.5% solids) 70.0 Gelatin 7.6 40% formaldehyde 0.9
The sub coating was dried by passing the paper first through an air drier at 160-180 F. for l-l5 sec. and then in front of a bank of infrared heaters at 240280 F. for -20 sec. The paper was then coated on the face side with a suitable photographic gelatin-based emulsion, and dried. When processed, no evidence of emulsion frill was noted. The same paper without the sub layer showed a complete sloughing off of the emulsion during processing.
When the same latex coated base was subbed with a 1.0 g./m. sub coating composed of equal parts (by solids weight) of a resin latex mixture of polystyrene resin latexstyrene butadiene resin latex combination (45 :55 by solids weight) and gelatin, adhesion was not considered passable--an objectionable amount of emulsion coating could be rubbed away.
1949 US2461474 A
A film base of cellulose acetate was coated with the following gelatinous substrating composition:
Parts Gelatin 0.73 Water 1.33 Acetic acid 1.20 Diphenylsulfone 1.34 Methanol 75.53
An anti-static gelatin composition suitable for the subbing of a photographic film support, which comprises a gelatin subbing composition containing from 0.5 to 1.5% of gelatin, from 1.33 to 15% of water, from 78 to 95.4% of a solvent for said support, and from 0.5 to of a diphenylsulfone of the following general formula: which comprises a gelatin subbing composition containing from 0.5 to 1.5% of gelatin, from 1.33 to of water, from 78 to 95.4% of a solvent for said support, and from 0.5 to 10% of diphenylsulfone.
1939 US2196775 A
A cellulose acetate photographic film base made from cellulose acetate containing about 40.5% acetyl was coated with a solution having the following composition:
Grams Polymerized methyl acrylate 1 Acetone 10 Methyl alcohol After this coating had dried the following solution was applied:
Grams Cellulose nitrate 1 Methyl alcohol 40 Butyl alcohol This layer was dried and a gelatin sub was then applied having the following composition:
Gelatin g 1 Acetic acid g 1 Water cc 25 Ethyl alcohol cc 25 The gelatin layer was dried and a photographic gelatino silver halide emulsion was then applied in the usual manner.
1938 Mr Babcock US2110496 has the coating speeds and formulas! Enjoy!
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