| (19) |
 |
|
(11) |
EP 0 365 502 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.01.1992 Bulletin 1992/01 |
| (43) |
Date of publication A2: |
|
25.04.1990 Bulletin 1990/17 |
| (22) |
Date of filing: 11.10.1989 |
|
|
| (84) |
Designated Contracting States: |
|
AT CH DE FR GB IT LI NL SE |
| (30) |
Priority: |
20.10.1988 FI 884843
|
| (71) |
Applicant: FINNMINERALS OY |
|
SF-00130 Helsinki (FI) |
|
| (72) |
Inventors: |
|
- Ahonen, Pertti Kalevi
SF-00980 Helsinki (FI)
- Huovinen, Mauno Sakari
SF-42300 Jämsänkoski (FI)
|
| (74) |
Representative: Roth, Ernst Adolf Michael et al |
|
GÖTEBORGS PATENTBYRA AB
Box 5005
S-402 21 Göteborg
S-402 21 Göteborg (SE) |
|
| |
|
| (54) |
Method for producing a pigment mix for coating paper |
(57) The invention concerns a method for preparing a pigment mix to be used in the coating
of a paper web, in which method a water slurry is prepared containing talc and at
least one other component of the coating mix such as calcined clay or calcined talc.
The invention is characterized by first dispersing talc into a water slurry and thereafter
mixing the second component of the coating mix in dry form into the talc slurry prepared
in the first stage. This kind of a direct mixing method results in a pigment mix allowing
preselected opacity and printability values of the paper to be attained using an appreciably
lower proportion of the second component, such as calcined clay or calcined talc,
in the mix.