Paper, cardboard or paperboard-like material and a process for its production
First Claim
1. A paper, cardboard or paperboard material containing inorganic fibers, inorganic particulate additives and organic binder or flocculating agents, wherein(A) the particulate inorganic additives constitute 40 to 80% by weight of the dry matter of the material, the inorganic particulate additives are composed of(i) 35-75% by weight of the dry matter of the material of a base filler selected from the group consisting of SiO2, kaolin, aluminum oxide, fuller'"'"'s earth, calcium carbonate and gypsum, of which 35 to 99% by weight have a particle size of <
- 2 μ
m and not more than 10% by weight have a particle size of >
20 μ
m, and(ii) 1 to 15% by weight of the dry matter of the material of an anionic flocculating active pigment of which at least 50% by weight have a primary particle size of <
2 μ
m, selected from the group consisting of aluminum hydroxide, bentonite and colloidal amorphous SiO2, and(B) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material,1000 g of base filler being unable to bind more than 0.1 mMol and 1000 g of anionic flocculating active pigment being able to bind at least 0.1 mMol cationic carbohydrate under flocculation prior to the attachment to the inorganic fiber.
0 Assignments
0 Petitions
Accused Products
Abstract
Paper, cardboard or paperboard-like material containing inorganic fibres, inorganic particle-like additives and organic binders and flocculating agents characterized in that
(1) the particle-like inorganic additives constitute 40-80% by weight of the dry matter of the material;
(2) the inorganic particle-like additives are composed of
(2.1) a base filler of which at least 20% by weight has a particle size of <2 μm and not more than 20% by weight has a particle size of >20 μm on the one hand and <0.5 μm on the other hand, and
(2.2) an anionic flocculating active pigment of which at least 50% by weight has a primary particle size of <2 μm,
(3.1) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material, and
(3.2) 1000 g of base filler is unable to bind more than 0.1 mMol and 1000 g of anionic flocculating active pigment is able to bind at least 0.1 mMol cationic carbohydrate under flocculation.
58 Citations
30 Claims
-
1. A paper, cardboard or paperboard material containing inorganic fibers, inorganic particulate additives and organic binder or flocculating agents, wherein
(A) the particulate inorganic additives constitute 40 to 80% by weight of the dry matter of the material, the inorganic particulate additives are composed of (i) 35-75% by weight of the dry matter of the material of a base filler selected from the group consisting of SiO2, kaolin, aluminum oxide, fuller'"'"'s earth, calcium carbonate and gypsum, of which 35 to 99% by weight have a particle size of < - 2 μ
m and not more than 10% by weight have a particle size of >
20 μ
m, and(ii) 1 to 15% by weight of the dry matter of the material of an anionic flocculating active pigment of which at least 50% by weight have a primary particle size of <
2 μ
m, selected from the group consisting of aluminum hydroxide, bentonite and colloidal amorphous SiO2, and(B) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material, 1000 g of base filler being unable to bind more than 0.1 mMol and 1000 g of anionic flocculating active pigment being able to bind at least 0.1 mMol cationic carbohydrate under flocculation prior to the attachment to the inorganic fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 28, 29, 30)
- 2 μ
-
23. A process for the manufacture of a paper, cardboard or paperboard material containing inorganic fibers, inorganic particulate additives and organic binder or flocculating agents, wherein
(A) the particulate inorganic additives constitute 40 to 80% by weight of the dry matter of the material, the inorganic particulate additives are composed of (i) 35-75% by weight of the dry matter of the material of a base filler selected from the group consisting of SiO2, kaolin, aluminum oxide, fuller'"'"'s earth, calcium carbonate and gypsum, of which 35 to 99% by weight have a particle size of < - 2 μ
m and not more than 10% by weight have a particle size of >
20 μ
m, and(ii) 1 to 15% by weight of the dry matter of the material of an anionic flocculating active pigment of which at least 50% by weight have a primary particle size of <
2 μ
m, selected from the group consisting of aluminum hydroxide, bentonite and colloidal amorphous SiO2, and(B) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material, 1000 g of base filler being unable to bind more than 0.1 mMol and 1000 g of anionic flocculating active pigment being able to bind at least 0.1 mMol cationic carbohydrate under flocculation prior to the attachment to the inorganic fiber, and comprising mixing an aqueous dispersion of said inorganic fibers and said particulate inorganic base fillers (i) with an aqueous suspension of said active pigment (ii), thereafter adding said cationic polymeric carbohydrate (B) to said mixture shortly before shaping, and shaping said mixture. - View Dependent Claims (24, 25, 26, 27)
- 2 μ
Specification