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US 5,824,190 AGranted
Methods and agents for improving paper printability and strength
AssigneeCytec Technology Corp.
InventorsGerald Guerro, David Dauplaise, Rajiv Bazaj
Life of this patent
Estimating the term…
Abstract
Compositions containing hydrophilic polyacrylamide and hydrophobic surface size agents and the methods for using such compositions in paper and board to improve printability, sizing and strength are provided in the instant invention.
Claims24
A method for improving the printability or strength of printing paper or board which comprises:
- applying to the surface of paper or board a mixture comprising:
- (i) a synthetic, polymeric surface size containing at least about 40 mole percent hydrophobic groups;
- and
- (ii) a substantially hydrophilic polyacrylamide;
- wherein the ratio of said surface size to said polyacrylamide is from about 30-95 parts by weight surface size to about 70-5 parts by weight polyacrylamide based on 100 parts by weight combined total surface size and polyacrylamide, said mixture applied in an amount effective to improve one or both of the printability or strength of the paper or board.
2 more elements
A method for improving the printability or strength of paper or board which comprises:
- 1) adding to a liquid medium in any order:
- (a) a mixture comprising:
- (i) a synthetic, polymeric carboxylated surface size containing at least about 40 mole percent hydrophobic groups;
- and
- (ii) a substantially hydrophilic polyacrylamide;
- wherein the ratio of said surface size to said polyacrylamide is from about 30-95 parts by weight surface size to about 70-5 parts by weight polyacrylamide based on 100 parts by weight combined total surface size and polyacrylamide;
- and
- (b) an effective amount of crosslinking agent to form a dilute mixture;
- wherein the weight ratio of liquid medium to said mixture ranges from about 70-99 parts liquid medium to about 30-1 parts mixture based on 100 parts by weight combined total liquid medium and mixture;
- and
- 2) applying said dilute mixture formed in step (1) to the surface of paper or board.
8 more elements
A method for improving the printability or strength of uncoated paper or board which comprises:
- (1) forming a dilute mixture by adding to an aqueous starch solution in any order:
- (a) a mixture comprising:
- (i) a surface size selected from the group consisting of:
- hydrolyzed styrene maleic anhydride copolymers, styrene maleic acid salt copolymers, styrene maleic ester copolymers, styrene (meth)acrylate copolymers, styrene (meth)acrylate ester copolymers, styrene (meth)acrylate ester acrylonitrile terpolymers, styrene (meth)acrylic acid copolymers, acrylonitrile (meth)acrylate salt copolymers, and polyurethanes;
- and
- (ii) a substantially hydrophilic polyacrylamide;
- wherein the ratio of said surface size to said polyacrylamide is from about 40-70 parts by weight surface size to about 60-30 parts by weight polyacrylamide based on 100 parts by weight combined total surface size and polyacrylamide, and said mixture comprises from about 0.5 to about 30 weight percent solids;
- and
- (b) an effective amount of a crosslinking agent;
- 2) applying said dilute mixture formed in step (1) to the surface of paper or board, in an amount sufficient to deposit from about 0.5 to about 15 pounds of total surface size and polyacrylamide per ton of paper or board.
7 more elements
Dependencies are inferred from the claim text.