Electroimpregnation of paper and non-woven fabrics
US4089765A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1974 |
| Grant date | May 16, 1978 |
| Priority date | — |
| Expiry date | Dec 13, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D13/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for electroimpregnation of paper and non-woven fabrics is disclosed. The method comprises the steps of forming an aqueous solution containing about 1-30% of an ionic material having a specific conductance lower than 0.003 mhos cm.sup.-1, in a bath provided with cathode and anode electrodes submerged in the solution, introducing a sheet of paper or non-woven fabric having a predetermined degree of porosity into the bath in contact with the cathode or anode electrode, dependent on the polarity of the ionic material, and applying a predetermined DC voltage to the electrodes so as to cause the ions of such material to impregnate the paper or non-woven fabric when such ions move toward one or the other of the electrodes and deposit within the paper or non-woven fabric as partially or totally associated molecules. The ionic material may advantageously be a polymeric material to improve the clarity, dielectric strength and moisture absorption resistance characteristics of the paper or non-woven fabric. The ionic material may also be a size or a dye for the paper industry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.