Coating method and coating slip for substantially inorganic fibrous material
US4937099A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1989 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Feb 22, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/56
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A coating slip and a method of coating a fibrous sheet material are disclosed. The coating slip comprises PA0 60-90% by weight pigment consisting of a mixture of talc and soapstone, PA0 10-50% by weight anionic polyelectrolyte, PA0 0-5% by weight thickener, and PA0 water in an amount such that the dry solids content of the coating slip will be 60-95% by weight. The weight ratio of talc:soapstone is preferably from about 30:70 to about 70:30, and the talc preferably has a mean particle diameter of about 10-20 .mu.m, while the soapstone preferably has a mean particle diameter of about 5-10 .mu.m. Upon coating, the sheet material is coated on one or both of its sides with preferably about 30-100 g dry material per square meter and side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.