Pigment system for paper

DETAILED DESCRIPTION I claim: 1.
A pigment system for paper comprising: titanium dioxide (TiO.
sub.
2) and zeolite of less than 3 micron average particle size and an average crystal size of less than 1 micron.
2.
The pigment system of claim 1 wherein there is 10 to 90% by weight of the TiO.
sub.
2 and 90 to 10% by weight of the zeolite.
3.
The pigment system of claim 1 wherein the zeolite has an average particle size of 1.
5 to 2.
5 microns and an average crystal size of 0.
2 to 0.
8 microns.
4.
The pigment system of claim 2 wherein the zeolite is Zeolite A which has an average particle size of 1.
5 to 2.
5 microns and an average crystal size of 0.
2 to 0.
8 microns.
5.
The pigment system of claim 1 wherein the zeolite has the following composition: Zeolite (Ca.
sub.
x Na.
sub.
12-x/2)A zH.
sub.
2 O wherein x can be up to about 4.
8 and z can be 20 to 27.
6.
The pigment system of claim 2 wherein the zeolite has the following composition: Zeolite (Ca.
sub.
x Na.
sub.
12-x/2)A zH.
sub.
2 O wherein x can be about 0.
3 to 3.
6 and z can be 20 to 27.
7.
The pigment system of claim 3 wherein the zeolite has the following composition: Zeolite (Ca.
sub.
x Na.
sub.
12-x/2)A zH.
sub.
2 O wherein x can be about 0.
3 to 3.
6 and z can be 20 to 27.
8.
The pigment system of claim 4 wherein the zeolite has the following composition: Zeolite (Ca.
sub.
x Na.
sub.
12-x/2)A zH.
sub.
2 O wherein x can be about 0.
3 to 3.
6 and z can be 20 to 27.
9.
The pigment system of claim 1 wherein the zeolite has the following composition: Zeolite [Ca.
sub.
x Na.
sub.
12-(x/2+y) Hy] zH.
sub.
2 O wherein x can be 0 to about 4.
8, y is about 0.
6 to 2.
5 and z is 20 to 27.
10.
The pigment system of claim 2 wherein the zeolite has the following composition: Zeolite [Ca.
sub.
x Na.
sub.
12-(x/2+y) Hy] zH.
sub.
2 O wherein x can be 0 to about 4.
8, y is about 0.
6 to 2.
5 and z is 20 to 27.
11.
The pigment system of claim 3 wherein the zeolite has the following composition: Zeolite [Ca.
sub.
x Na.
sub.
12-(x/2+y) Hy] zH.
sub.
2 O wherein x can be 0 to about 4.
8, y is about 0.
6 to 2.
5 and z is 20 to 27