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US3988157A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for adhering hydrophilic layers to dimensionally stable polyester films

Assignee: Agfa Gevaert NV
•
Filing: 1975-06-03
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Granted: 1976-10-26
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Expires: 1995-06-03
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Abstract

Abstract Hydrophilic layers are made to adhere to dimensionally stable polyester film supports by applying to an unstretched or only longitudinally stretched polyester film an adhesive layer from an aqueous coating composition comprising a chlorine-containing copolymer formed of 45 to 99.5 % by weight of at least one of the monomers vinylidene chloride and vinyl chloride, 0.5 to 10 % by weight of an ethylenically unsaturated mono- or dicarboxylic acid or of N-vinyl pyrrolidone, and 0 to 54.5 % by weight of at least one monomer taken from acrylamides, methacrylamides, esters of acrylic acid, methacrylic acid and maleic acid, and N-alkyl maleimides. Immediately thereafter, without drying of the adhesive layer, a subbing layer is applied thereto from an aqueous gelatin solution comprising a plasticizer for the gelatin. After drying of the two layers, they are biaxially or transversally stretched together with the polyester film support, and heat-setted. Finally a hydrophilic layer is applied to the subbing layer. The polyester film may be a film of polyethylene terephthalate and the hydrophilic layer applied to the subbing layer may be a light-sensitive gelatin silver halide emulsion layer.

Inventors

  • 👤 August Jean Van Paesschen
  • 👤 Lucien Janbaptist Van Gossum

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 23:51
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B29C55/026; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/056; G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2367/00; C08J2367/02; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; Y; Y10; Y10S; Y10S430/00; Y10S430/141

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 164 words
A process for adhering hydrophilic layers to dimensionally stable polyester film supports, which comprises applying to polyester film unstretched in at least its transverse direction an adhesive layer from an aqueous coating dispersion comprising as the dispersal phase a chlorine-containing copolymer formed of 45 to 99.5% by weight of at least one of the monomers vinylidene chloride and vinyl chloride, 0.5 to 10% by weight of an ethylenically unsaturated mono- or dicarboxylic acid or of N-vinylpyrrolidone, and 0 to 54.5% by weight of at least one copolymerizable monomer taken from acrylamides, methacrylamides, esters of acrylic acid, methacrylic acid and maleic acid, and N-alkyl maleimides; immediately applying thereto, without drying of said adhesive layer, a subbing layer from an aqueous gelatin solution containing a plasticizer for the gelatin, drying the two layers, stretching the thus-coated polyester film support to biaxially orient the same at a temperature up to about 90° C., heat-setting the stretched coated support, and applying to the subbing layer a hydrophilic layer.
Claim 2
Dependent Claim 164 words
A process for adhering hydrophilic layers to dimensionally stable polyester film supports, which comprises applying to polyester film unstretched in at least its transverse direction an adhesive layer from an aqueous coating dispersion comprising as the dispersal phase a chlorine-containing copolymer formed of 45 to 99.5% by weight of at least one of the monomers vinylidene chloride and vinyl chloride, 0.5 to 10% by weight of an ethylenically unsaturated mono- or dicarboxylic acid or of N-vinylpyrrolidone, and 0 to 54.5% by weight of at least one copolymerizable monomer taken from acrylamides, methacrylamides, esters of acrylic acid, methacrylic acid and maleic acid, and N-alkyl maleimides; immediately applying thereto, without drying of said adhesive layer, a subbing layer from an aqueous gelatin solution containing a plasticizer for the gelatin, drying the two layers, stretching the thus-coated polyester film support to biaxially orient the same at a temperature up to about 90° C., heat-setting the stretched coated support, and applying to the subbing layer a hydrophilic layer.
Claim 3
Dependent Claim 17 words
A process according to claim 1, wherein the polyester film is a film of a polyethylene terephthalate.
Claim 4
Dependent Claim 27 words
A process according to claim 1, wherein the chlorine-containing copolymer is a copolymer of vinylidene chloride, vinyl chloride, n-butyl acrylate, and itaconic acid (63:30:5:2 % by weight).
Claim 5
Dependent Claim 25 words
A process according to claim 1, wherein the chlorine-containing copolymer is a copolymer of vinylidene chloride, methyl acrylate and itaconic acid (88:10:2 % by weight).
Claim 6
Dependent Claim 37 words
A process according to claim 1, wherein said plasticizer is taken from 1,1,1-tri(hydroxymethyl)-propane, 1,2,6-hexanetriol, caprolactam, glutaric acid, trimellitic acid, resorcinol, 2-sulphoethyl methacrylate, and the latex of a copolymer of butadiene and methyl methacrylate (25:75 % by weight).
Claim 7
Dependent Claim 23 words
A process according to claim 1, wherein the hydrophilic layer applied to the subbing layer is a light-sensitive gelatin silver halide emulsion layer.

References Cited (Backward Citations)

US3607345A Cited
US3353958A Cited
US3545972A Cited
US3586508A Cited
US3589905A Cited
US3674531A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-10-26 1980-04-26 1980-10-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-10-26 1984-04-26 1984-10-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-10-26 1988-04-26 1988-10-26 $7700.00 Window Closed / Lapsed

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