Low density material containing a vegetable filler
US5227024A · kind A · utility
Inventor
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L97/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for reducing the density, increasing the bulk, the hand and the porosity of a sheet material containing fibers by use of a vegetable filler, wherein a pulverulant vegetable filler of density less than 500 kg/m.sup.3 is introduced into the fibrous mass during the manufacture of the material. At least 95% by weight of the particles of the vegetable filler are less than 150 micrometers in size and at least 80% by weight of the particles of vegetable filler are greater than 10 micrometers in size. The process is particularly useful for obtaining paper and cardboard of low density with improved hand (or bulk) and porosity. It is also attractive since it reduces the cost prices and enhances the thermal and acoustic insulation properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.