Abstract: Lithographic printing plate precursors are prepared with a unique aluminum-containing substrate and one or more radiation-sensitive imageable layers. The aluminum-containing substrate is prepared by three separate and sequential anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 500-1,500 nm and a multiplicity of inner pores having an average inner pore diameter (Di) larger than 0 and <15 nm. A formed middle aluminum oxide layer has a dry thickness (Tm) of 60-300 nm and a multiplicity of middle pores of average middle pore diameter (Dm) of 15-60 nm, arranged over the inner aluminum oxide layer. A formed outer aluminum oxide layer comprises a multiplicity of outer pores having an average outer pore diameter (Do) of 5-35 nm and an average dry thickness (To) of 30-150 nm, arranged over the middle aluminum oxide layer. Dm is larger than Do that is larger than Di.

Abstract: Lithographic printing plate precursors are prepared with a unique aluminum-containing substrate and one or more radiation-sensitive imageable layers. The aluminum-containing substrate is prepared by three separate and sequential anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 500-1,500 nm and a multiplicity of inner pores having an average inner pore diameter (Di) larger than 0 and <15 nm. A formed middle aluminum oxide layer has a dry thickness (Tm) of 60-300 nm and a multiplicity of middle pores of average middle pore diameter (Dm) of 15-60 nm, arranged over the inner aluminum oxide layer. A formed outer aluminum oxide layer comprises a multiplicity of outer pores having an average outer pore diameter (Do) of 5-35 nm and an average dry thickness (To) of 30-150 nm, arranged over the middle aluminum oxide layer. Dm is larger than Do that is larger than Di.

Abstract: Lithographic printing plate precursors are prepared with a unique substrate and one or more radiation-sensitive imageable layers. The substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 650-3,000 nm and a multiplicity of inner micropores having an average inner micropore diameter (Di) of ?15 nm. A formed outer aluminum oxide layer comprises a multiplicity of outer micropores having an average outer micropore diameter (Do) of 15-30 nm; an average dry thickness (To) of 130-650 nm; and a micropore density (Co) of 500-3,000 micropores/?m2. The ratio of Do to Di is greater than 1.1:1, and Do in nanometers and the outer aluminum oxide layer micropore density (Co) in micropores/?m2, are further defined by the outer aluminum oxide layer porosity (Po) according to the following equation: 0.3?Po?0.8 where Po is 3.14(Co)(Do2)/4,000,000.

Abstract: On-press developable, negative-working lithographic printing plate precursors are used to provide lithographic printing plates. Such precursors are prepared with a substrate and one or more negative-working, infrared radiation-sensitive imagable layers. The substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 650-3,000 nm and inner micropores having an average inner micropore diameter (Di) of <15 nm. A formed outer aluminum oxide layer comprises outer micropores having an average outer micropore diameter (Do) of 15-30 nm; an average dry thickness (To) of 130-650 nm; and a micropore density (Co) of 500-3,000 micropores/?m2. The ratio of Do to Di is greater than 1.1:1, and Do in nanometers and the outer aluminum oxide layer micropore density (Co) in micropores/?m2, are further defined by the outer aluminum oxide layer porosity (Po) as: 0.3?Po?0.8 wherein Po is 3.14(Co)(Do2)/4,000,000.

Abstract: On-press developable, negative-working lithographic printing plate precursors are used to provide lithographic printing plates. Such precursors are prepared with a substrate and one or more negative-working, infrared radiation-sensitive imagable layers. The substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 650-3,000 nm and inner micropores having an average inner micropore diameter (Di) of <15 nm. A formed outer aluminum oxide layer comprises outer micropores having an average outer micropore diameter (Do) of 15-30 nm; an average dry thickness (To) of 130-650 nm; and a micropore density (Co) of 500-3,000 micropores/?m2. The ratio of Do to Di is greater than 1.1:1, and Do in nanometers and the outer aluminum oxide layer micropore density (Co) in micropores/?m2, are further defined by the outer aluminum oxide layer porosity (Po) as: 0.3?Po?0.8 wherein Po is 3.14(Co)(Do2)/4,000,000.

Abstract: Lithographic printing plate precursors are prepared with a unique substrate and one or more radiation-sensitive imageable layers. The substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 650-3,000 nm and a multiplicity of inner micropores having an average inner micropore diameter (Di) of ?15 nm. A formed outer aluminum oxide layer comprises a multiplicity of outer micropores having an average outer micropore diameter (Do) of 15-30 nm; an average dry thickness (To) of 130-650 nm; and a micropore density (Co) of 500-3,000 micropores/?m2. The ratio of Do to Di is greater than 1.1:1, and Do in nanometers and the outer aluminum oxide layer micropore density (Co) in micropores/?m2, are further defined by the outer aluminum oxide layer porosity (Po) according to the following equation: 0.3?Po?0.8 where Po is 3.14(Co)(Do2)/4,000,000.