Laminates for the manufacture of relief printing plates

Details Laminates for the manufacture of relief printing plates Laminates for the manufacture of relief printing plates

1974-10-22

1976-11-09

Powell, William A.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 351, 96 363, 96 86P, 96 87R, 96115P, 101150, 101395, 1014011, 101456, G03C 194, G03C 168, G03C 180, G03F 700

Patent

active

039908976

ABSTRACT:
The invention relates to relief plates for flexographic printing comprising a relatively soft elastomeric base (U) having a modulus of elasticity of from 10 to 200 kg/cm.sup.2 and a thickness of from 0.5 to 6 mm and, firmly bonded thereto, a thin, relatively hard, difficultly soluble intermediate layer Z having a modulus of elasticity of from 1 .times. 10.sup.3 to 2.1 .times. 10.sup.6 kg/cm.sup.2 and a thickness of from 5 to 500 .mu. and, firmly bonded to said intermediate layer Z, a relief layer P' consisting of a photocrosslinked elastomeric mixture having a modulus of elasticity of from 30 to 2000 kg/cm.sup.2 and a thickness of from 200 to 300 .mu., the modulus of elasticity of the photocrosslinked relief layer P' being the same as or higher than that of the base U and the neutral surface of the relief plate lying in or near the intermediate layer Z. The invention also relates to photosensitive laminates for the production of such plates.

REFERENCES:
patent: 2760863 (1956-08-01), Plambeck, Jr.
patent: 3024180 (1962-03-01), Mc Graw
patent: 3202513 (1965-08-01), Thommes
patent: 3271149 (1966-09-01), Starch et al.
patent: 3356501 (1967-12-01), Tongs
patent: 3479182 (1969-11-01), Chu
patent: 3764324 (1973-10-01), Reyes

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