High porosity carbon coated cigarette papers
US4225636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1979 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Mar 8, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24D1/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for producing high porosity, high carbon content cigarette papers in which a paper substrate having an initial Filtrona porosity of at least 10,000 air permeability units is coated with an aqueous suspension containing from 10 to 50% by weight finely divided carbon, up to 3% by weight of a water-soluble binder, and from 0.5 to 3% by weight of an alkali metal carbonate and thereafter dried resulting in a coated paper having a Filtrona porosity of not less than 5,000 air permeability units. Carbon coated cigarette papers made in accordance with the foregoing method may be used as the inner wrapper for the tobacco column of a cigarette in combination with an outer wrapper of porous or perforated cigarette paper to provide substantial reductions in the constituent yields in the mainstream and sidestream smoke emanating from the cigarette without increasing the carbon monoxide yield obtained in the smoke from the cigatette when compared to conventional cigarettes containing a single wrap of standard cigarette paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.