Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Patent
1981-02-24
1982-12-14
Brown, J. Travis
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
430534, 430535, G03C 178
Patent
active
043638724
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a coated film base suitable for coating with a light-sensitive photographic emulsion, to a light-sensitive photographic film comprising a light-sensitive photographic emulsion applied to the coated film bases and to processes for the production of the film base and the light-sensitive photographic film.
It is known in the photographic art that light-sensitive photographic emulsions, such as conventional light-sensitive gelatinous silver halide emulsions, do not adhere readily to the surfaces of supports derived from thermoplastics films, such as films of synthetic linear polyesters. It has therefore become common practice in the art to improve the adhesion between the film support and the photographic emulsions by pretreating the surface of the film support prior to the application of the photographic emulsion, for example, by coating with one or more polymeric adhesion-promoting layers and optionally with a further adhesion-promoting gelatinous layer. Such layers are often termed subbing layers.
The present invention relates to a subbing copolymer which is effective in promoting the adhesion of a light-sensitive photographic emulsion to a film support of a synthetic linear polyester.
According to the present invention a coated film base suitable for coating with a light-sensitive photographic emulsion layer comprises a self-supporting film of a synthetic linear polyester and a continuous subbing layer applied to at least one surface of said self-supporting film comprising a water-insoluble copolymer of (a) a comonomer selected from acrylic acid, methacrylic acid or a derivative of acrylic acid or methacrylic acid and (b) a copolymerisable sulphonated ethylenically unsaturated comonomer having the general structure: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and represent hydrogen, halogen, alkyl, nitrile, amide, amine, ketone, ether or vinyl; ester, substituted ester, naphthylene, substituted naphthylene or vinylene; and is preferably lithium, potassium or sodium; percentages in the ranges (a) 26 to 99% and (b) 1 to 50%.
According to another aspect of the invention, a light-sensitive photographic film comprises a light-sensitive photographic emulsion layer applied directly or indirectly to the subbing layer of the coated film base defined in the preceding paragraph.
The invention also relates to a process for the production of a coated film base which comprises applying a continuous subbing layer to at least one surface of a self-supporting film of a synthetic linear polyester wherein the subbing layer is applied from a film-forming composition comprising a water-insoluble copolymer of (a) a comonomer selected from acrylic acid, methacrylic acid or a derivative of acrylic acid or methacrylic acid and (b) a copolymerisable sulphonated ethylenically unsaturated comonomer having the general structure: ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and represent hydrogen, halogen, alkyl, nitrile, amide, amine, ketone, ether or vinyl; ester, substituted ester, naphthylene, substituted naphthylene or vinylene; and is preferably lithium, potassium or sodium; percentages in the ranges (a) 26 to 99%, (b) 1 to 50%.
In another aspect of the invention, a process for the production of a light-sensitive photographic film comprises applying a light-sensitive photographic emulsion layer directly or indirectly to the subbing layer applied to the self-supporting film in the process defined in the preceding paragraph.
It has been surprisingly discovered that comonomer (b) is effective in adhering the light-sensitive photographic emulsion to the subbing layer. Comonomer (b) also confers anti-static properties upon the coated film base.
The subbing copolymer may be derived from one or more comonomers falling within the definitions of each of the comonomers (a) and (b).
The self-supporting film may be produced from any suitable synthetic linear polyester which may be obtained by condensing one or more dicarboxylic acids or their lower alkyl
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patent: 3592655 (1971-07-01), Dykstra
patent: 4135932 (1979-01-01), Mann
patent: 4225665 (1980-09-01), Schadt
patent: 4229523 (1980-10-01), Ohta et al.
patent: 4301240 (1981-11-01), Bruck et al.
Brown J. Travis
Imperial Chemical Industries Limited
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