发明授权
US08173346B2 Printing members having permeability-transition layers and related methods
有权
具有渗透性过渡层的印刷部件和相关方法
- 专利标题: Printing members having permeability-transition layers and related methods
- 专利标题(中): 具有渗透性过渡层的印刷部件和相关方法
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申请号: US12466760申请日: 2009-05-15
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公开(公告)号: US08173346B2公开(公告)日: 2012-05-08
- 发明人: Gerald P. Harwood, Jr. , Eugene L. Langlais
- 申请人: Gerald P. Harwood, Jr. , Eugene L. Langlais
- 申请人地址: US NH Hudson
- 专利权人: Presstek, Inc.
- 当前专利权人: Presstek, Inc.
- 当前专利权人地址: US NH Hudson
- 代理机构: Bingham McCutchen LLP
- 主分类号: G03F7/037
- IPC分类号: G03F7/037 ; G03F7/26
摘要:
Affinity transitions from hydrophobic to hydrophilic states, rather than ablation mechanisms, facilitate the creation of an imagewise lithographic pattern on a printing plate. In various embodiments, a lithographic printing member comprises a topmost “imaging” layer that undergoes, in response to heat, a transition from a hydrophobic and oleophilic state to a hydrophilic state (which may or may not also be oleophilic); and a substrate disposed below the imaging layer. The affinity change in the imaging layer may be due essentially to a foaming agent therein. The foaming agent decomposes upon heating, creating a gas that foams the surface of the imaging layer. The resulting spongelike texture enables the surface to retain water, i.e., renders it hydrophilic.