Process for the manufacture of coated liquid packaging board
AssigneesErplip S.A., Kemira Iberica S.A.
InventorsJuan José Costas Poch, Josep Lluis Bisbal Tudela
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Abstract
The process contemplates the use of a sizing dispersion that comprises an aqueous dispersion of rosin material, a synthetic sizing agent and a aluminum compound selected from the group formed by aluminum sulfate and aluminum polymers of formulas [Al(OH)x(A)(3−x)]n (1) or [Al(OH)x(H3PO4)y(A)(3−x)]n (2) where A=Cl−, NO3−, HCOO−, CH3COO−; or [Al(OH)x(H3PO4)y(SO4)(3−x/2)]n (3) where “x” ranges from 0.03 to 2.7, and “y” ranges from 0.01 to 0.8 and n≧2; and by mixtures thereof.
Claims8
A process for the manufacture of coated liquid packaging board having improved long term resistance to edge penetration by lactic acid or hot hydrogen peroxide, which process comprises:
- (a) forming a sized board of cellulose fibers using a sizing dispersion containing an aqueous dispersion of rosin material, a ketene dimer (AKD) of formula
- wherein R1, and R2 are C6-C30 hydrocarbon groups as a sizing agent and from 20 to 60 wt % of an aluminum compound calculated as aluminum on rosin material in the sizing dispersion, wherein said aluminum compound is chosen from the group consisting of (1) aluminum sulfate;
- (2) aluminum polymers of general formula 1
- [Al(OH)x(A)(3−x)]n (1)
- where A=Cl−, NO3−, HCOO−, or CH3COO−;
- (3) aluminum polymers of general formula 2
- [Al(OH)x,(H3PO4)y(A)(3−x)]n (2)
- where A=Cl−, NO3−, HCOO−, or CH3COO−;
- (4) aluminum polymers of general formula 3
- [Al(OH)x(H3PO4)y (SO4)(3−x/2)]n (3)
- where “x” ranges from 0.03 to 2.7, and “y” ranges from 0.01 to 0.8 and n≧2;
- and
- (5) mixtures thereof, and (b) applying to the sized board a suspension containing at least a binder and a pigment to form a coated board.
Dependencies are inferred from the claim text.