发明授权
- 专利标题: Protective overcoat for photographic elements
- 专利标题(中): 摄影元素保护罩
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申请号: US09235437申请日: 1999-01-22
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公开(公告)号: US06232049B1公开(公告)日: 2001-05-15
- 发明人: Mridula Nair , Tamara K. Jones , Tiecheng A. Qiao
- 申请人: Mridula Nair , Tamara K. Jones , Tiecheng A. Qiao
- 主分类号: G03C189
- IPC分类号: G03C189
摘要:
The present invention is a photographic element which includes a support, at least one silver halide emulsion layer superposed on the support and a processing solution permeable protective overcoat overlying the silver halide emulsion layer. The processing solution permeable overcoat is composed of a urethane-vinyl copolymer having acid functionalities wherein a weight ratio of a urethane component in the copolymer comprises from 20 to 100 percent and a weight ratio of a vinyl component in the copolymer comprises from 0 to 80 percent and a second polymer composed of polyvinyl alcohol, cellulose ethers, n-vinyl amides, polyesters, poly(ethylene oxide), starch, proteins, whey, albumin, poly(acrylic acid), alginates or gums. The present invention is a method of making a photographic element which includes providing an photographic element having a support, a silver halide emulsion layer superposed on the support and a processing solution permeable protective overcoat overlying the silver halide emulsion layer. The processing solution permeable overcoat is composed of a urethane-vinyl copolymer having acid functionalities wherein a weight ratio of a urethane component in the copolymer comprises from 20 to 100 percent and a weight ratio of a vinyl component in the copolymer comprises from 0 to 80 percent and a second polymer composed of polyvinyl alcohol, cellulose ethers, n-vinyl amides, polyesters, poly(ethylene oxide), starch, proteins, whey, albumin, poly(acrylic acid), alginates or gums. The photographic element is developed in a developer solution having a pH greater than 7 and the processing solution permeable overcoat is fused.
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