JP2004514796A5

JP2004514796A5 -

Info

Publication number: JP2004514796A5
Application number: JP2002517894A
Authority: JP
Filing date: 2001-08-02
Publication date: 2005-03-03

Claims

In an aqueous suspension containing cellulosic fibers and optional fillers,
(I) an anion or cation sizing dispersion, and (ii) a cationic organic polymer having one or more aromatic groups, and a step-growth polymer, polysaccharide or naturally occurring aromatic having one or more aromatic groups Adding a sizing accelerator containing an anionic polymer that is a polymer, forming the resulting suspension and dehydrating, adding the sizing dispersion and the sizing accelerator separately to the aqueous suspension A paper sizing method characterized by:

The method of claim 1, wherein the cationic organic polymer and the anionic polymer contained in the sizing accelerator are added separately to the aqueous suspension.

An anionic polymer having an aromatic group contained in the sizing accelerator is added to the aqueous suspension after both the sizing dispersion and the cationic organic polymer having an aromatic group contained in the sizing accelerator. The method of claim 1.

The method according to any one of claims 1 to 3, wherein the cationic organic polymer is a cationic polysaccharide or a cationic vinyl addition polymer.

The cationic organic polymer has the structural formula (I):

(Wherein P is a polysaccharide residue, A is a chain of atoms including C and H atoms that bind N to the polysaccharide residue, and R ₁ and R ₂ are each H or a hydrocarbon group. , R ₃ is an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X ⁻ is an anion counterion)
And / or general formula (II):

(Wherein R ₁ is H or CH ₃ , R ₂ and R ₃ are each an alkyl group having 1 to 3 carbon atoms, A ₁ is O or NH, and B ₁ is 2 to 8) An alkylene group having 1 carbon atom or a hydroxypropylene group, Q is a substituent containing an aromatic group, and X ⁻ is an anion counterion)
The method according to any one of claims 1 to 4, which is a vinyl addition polymer obtained by polymerizing a cationic monomer or a monomer mixture containing a cationic monomer.

The method of claim 1 wherein the cationic organic polymer is selected from cationic polysaccharides.

2. A process according to claim 1 wherein the cationic organic polymer is selected from cationic starch.

The cationic polymer is structural formula (I):

(Wherein P is a polysaccharide residue, A is a chain of atoms including C and H atoms that bind N to the polysaccharide residue, and R ₁ and R ₂ are each H or a hydrocarbon group. , R ₃ is an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X ⁻ is an anion counterion)
The method according to claim 1, which is selected from cationic polysaccharides having the formula:

A is an alkylene group having 2 to 18 carbon atoms, optionally interrupted or substituted by one or more heteroatoms, and R ₁ and R ₂ are each H or 1 to 3 carbon atoms The method according to claim 8, wherein R ₃ is a benzyl group or a phenylethyl group.

The method according to any one of claims 1 to 9, wherein the anionic polymer is a step-growth polymer or a naturally occurring aromatic polymer.

The method according to any one of claims 1 to 9, wherein the anionic polymer is a naphthalene sulfonate condensation polymer or a modified lignin polymer.

The method according to any one of claims 1 to 9, wherein the anionic polymer is condensed naphthalene sulfonate or lignin sulfonate.

In an aqueous suspension containing cellulosic fibers and optional fillers,
(I) an anionic or cationic sizing dispersion comprising a sizing agent and an anionic polymer having one or more aromatic groups, and (ii) a cationic organic polymer having one or more aromatic groups, and one A sizing accelerator comprising an anionic polymer having the above aromatic group,
And sizing the resulting suspension, dehydrating, and adding the sizing dispersion and the sizing accelerator separately to the aqueous suspension.

The method of claim 13, wherein the sizing dispersion further comprises a cationic organic polymer having one or more aromatic groups.

The method according to claim 13 or 14, wherein the cationic organic polymer is a cationic polysaccharide or a cationic vinyl addition polymer.

The cationic organic polymer has the structural formula (I):

(Wherein P is a polysaccharide residue, A is a chain of atoms including C and H atoms that bind N to the polysaccharide residue, and R ₁ and R ₂ are each H or a hydrocarbon group. , R ₃ is an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X ⁻ is an anion counterion)
A cationic polysaccharide having the general formula (II):

(Wherein R ₁ is H or CH ₃ , R ₂ and R ₃ are each an alkyl group having 1 to 3 carbon atoms, A ₁ is O or NH, and B ₁ is 2 to 8) An alkylene group having 1 carbon atom or a hydroxypropylene group, Q is a substituent containing an aromatic group, and X ⁻ is an anion counterion)
The method according to claim 13 or 14, which is a vinyl addition polymer obtained by polymerizing a cationic monomer or a monomer mixture containing a cationic monomer.

15. A method according to claim 13 or claim 14 wherein the cationic organic polymer is a cationic polysaccharide.

The cationic organic polymer has the structural formula (I):

(Wherein P is a polysaccharide residue, A is a chain of atoms including C and H atoms that bind N to the polysaccharide residue, and R ₁ and R ₂ are each H or a hydrocarbon group. , R ₃ is an aromatic hydrocarbon group, n is an integer from 2 to 300,000, and X ⁻ is an anion counterion)
The method according to claim 17, which is a cationic polysaccharide having the formula:

A is an alkylene group having 2 to 18 carbon atoms, optionally interrupted or substituted by one or more heteroatoms, and R ₁ and R ₂ are each H or 1 to 3 carbon atoms The method according to claim 18, wherein R ₃ is a benzyl group or a phenylethyl group.

20. A method according to any one of claims 13 to 19 wherein the anionic polymer is a step-growth polymer, a polysaccharide or a naturally occurring aromatic polymer.

20. A method according to any one of claims 13 to 19 wherein the anionic polymer is a step-growth polymer or a naturally occurring aromatic polymer.

20. A process according to any one of claims 13 to 19 wherein the anionic polymer is a naphthalene sulfonate condensation polymer or a modified lignin polymer.

20. A process according to any one of claims 13 to 19 wherein the anionic polymer is condensed naphthalene sulfonate or lignin sulfonate.

The method according to any one of claims 1 to 23, wherein the sizing agent is a cellulose reactive sizing agent.

The method according to any one of claims 1 to 24, wherein the sizing agent is a ketene dimer or an acid anhydride.

The method according to any one of claims 1 to 24, wherein the sizing agent is an acid anhydride.

27. A method according to any one of claims 1 to 26, wherein the conductivity of the suspension is at least 4.5 mS / cm.

28. A method according to any one of claims 13 to 27, wherein the cationic organic polymer and the anionic polymer contained in the sizing accelerator are added separately to the aqueous suspension.

29. Any of claims 13 to 28, wherein the anionic polymer contained in the sizing accelerator is added to the aqueous suspension after both the sizing dispersion and the cationic organic polymer contained in the sizing accelerator. 2. The method according to item 1.

The amount of sizing promoter cationic organic polymer added to the suspension is from about 0.001% to about 3% by weight based on the dry fiber, and the sizing promoter added to the suspension. 30. A method according to any one of claims 1 to 29 wherein the amount of anionic polymer is from about 0.001% to about 3% by weight based on the dry fiber.

31. The range of claims 1 to 30 wherein the amount of sizing dispersion added to the suspension is from about 0.01% to about 5.0% by weight calculated as a sizing agent based on the dry fiber The method of any one of these.