METHOD OF MANUFACTURING DOUBLE-LAYER SHEET MICROPOROUS MATERIAL FOR INK-PADS Russian patent published in 2006 - IPC C08J9/28 C08L27/06 B41K1/54 

FIELD: polymer materials.

SUBSTANCE: invention relates to a method for manufacturing equal-thickness elastic microporous polyvinylchloride material constituted by metering and storage layers attached to attached to each other by a system of through holes. Metering layer composition is prepared from, wt %: polyvinylchloride 25-40, dibutyl or butylbenzyl phthalate 15-25, T-92 oxal as flotation reagent 15-25, and triethylene glycol 20-35. Measured quantity of composition is uniformly distributed at a rate 0.07-0.16 ml/cm² in lower portion of metallic or glass mold restricted from three sides by flat barriers with suitable height, thermally treated in strictly horizontal position at 80-110°C to transform liquid state into solid state, and cooled to temperature not higher than 35°C, after which mold is closed with flat upper portion, the twp portions are clamped, mold is installed in upright position, and composition contained in storage layer is poured in slot-like space at following proportions of components, wt %: polyvinylchloride 12-20, dibutyl or butylbenzyl phthalate 16-26, oxal T-92 11-13, triethylene glycol 12-17, and sucrose 30-45. Thereafter, contents are thermally treated in vertical and inclined positions at 150-180°C for 15-50 min until composition is completely gelled. When cooled to ambient temperature, sheet is removed, washed out in water from sucrose and triethylene glycol, and dried. Thus prepared material is characterized by thickness of metering layer about 0.7 to 1.6 μm, pore size if metering layer not larger than 1 μm, the same in storage layer 20 to 800 μm, and total porosity 40-55%. The sheet is cut into green products for ink-pads with required shape and dimensions and glued to a bottom of small box to be latter soaked with required amount of suitable ink.

EFFECT: enabled manufacturing high-quality ink-pad (especially exchangeable ones for automated equipment), which are able of metering ink, which allows printing of several thousands of clear nonspreading prints.

4 dwg, 1 tbl, 4 ex