Surface application of polymers and polymer mixtures to improve paper strength
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-003/00
C08L-003/02
D21H-021/10
D21H-017/28
D21H-021/00
D21H-021/18
C08L-033/26
출원번호
US-0940197
(2010-11-05)
등록번호
US-8696869
(2014-04-15)
발명자
/ 주소
Borkar, Sachin
Putnam, Marc C.
출원인 / 주소
Hercules Incorporated
대리인 / 주소
Herman, Michael J.
인용정보
피인용 횟수 :
5인용 특허 :
16
초록
Stable, coating compositions useful for enhancing the dry strength of paper are disclosed. The compositions comprise an aqueous solution of nearly neutral polymer, cationic polymer and starch. Method of using the coating composition to improve the dry strength of paper is also disclosed.
대표청구항▼
1. A coating composition for a formed paper substrate comprising: component A selected from the group consisting of a polyacrylamide having less than 5 molar percent anionic functionality; component B selected from the group consisting of a cationic polymer wherein the cationic polymers have charge
1. A coating composition for a formed paper substrate comprising: component A selected from the group consisting of a polyacrylamide having less than 5 molar percent anionic functionality; component B selected from the group consisting of a cationic polymer wherein the cationic polymers have charge densities, on a solids basis, in the range of 1.00 to 12.00 meq/g; and starch wherein the ratio of component A to component B is from 99:1 to 80:20; and wherein the ratio of component A plus component B to starch is from 1:105 to 1:1. 2. The coating composition of claim 1 wherein component B is prepared from a vinyl or allyl monomer bearing amine functionality. 3. The coating composition of claim 1 wherein component A is prepared from monomers wherein at least one monomer is selected from the group consisting of acrylamide, methacrylamide, N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, and N-isopropyl(meth)-acrylamide. 4. The coating composition of claim 1 wherein component A is prepared from monomers wherein at least one monomer is selected from the group consisting of acrylic acid, methacrylic acid, 2-acrylamido-2-methylpropane sulfonic acid, 4-styrenesulfonic acid, and 4-vinylbenzoic acid and their salts. 5. The coating composition of claim 1 wherein component B is prepared from monomers wherein at least one monomer is selected from the group consisting of dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, diethylaminopropyl (meth)acrylate, [2-(Methacryloyloxy) ethyl]trimethylammonium chloride, [3-(Methacryloylamino) propyl]trimethylammonium chloride, [2-(Acryloyloxy) ethyl]trimethylammonium chloride, [3-(Acryloyloxy) propyl]trimethylammonium chloride, N,N-dimethylamino propyl(meth)acrylamide, dialkyldiallylamine, diallylamine, dialkylallylamine, and allylamine. 6. The coating composition of claim 5 wherein component B is additionally prepared from at least one monomer selected from the group consisting of acrylamide, (meth)acrylamide, N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, and N-isopropyl (meth)acrylamide. 7. The coating composition of claim 1 wherein component B comprises the hydrolyzed product of a polymer prepared from at least one monomer from the group consisting of N-vinyl formamide, N-vinyl acetamide, and vinyl N-phthalimide. 8. The coating composition of claim 1 wherein component B comprises a vinylamine containing polymer. 9. The coating composition of claim 1 wherein component A is cross linked with a monomer selected from the group consisting of ethylene glycol di(meth)acrylate, diethyleneglycol di(meth)acrylate, methylenebisacrylamide, methylene-bis-(meth)acrylamide, ethylene-bis-(meth)acrylamide, and hexamethylene-bis-(meth)acrylamide. 10. The coating composition of claim 1 wherein component B is cross linked with a monomer selected from the group consisting of ethylene glycol di(meth)acrylate, diethyleneglycol di(meth)acrylate, methylenebisacrylamide, methylene-bis-(meth)acrylamide, ethylene-bis-(meth)acrylamide, and hexamethylene-bis-(meth)acrylamide. 11. The coating composition of claim 1 wherein the molecular weight of component A is from 30,000 to about 300,000 Daltons. 12. The coating composition of claim 1 wherein the molecular weight of component B is from 50,000 to about 600,000 Daltons. 13. The coating composition of claim 1 wherein the starch is selected from the group consisting of unmodified or modified corn starch, rice starch, potato starch, wheat starch, and tapioca starch. 14. The coating composition of claim 1 wherein the viscosity of the composition is less than 1000 centipoise at a temperature of 60° C. 15. A process for making paper with improved dry strength, the process comprising applying to already formed paper a composition, comprising: component A selected from the group consisting of a polyacrylamide having less than 5 molar percent anionic functionality, component B selected from the group consisting of a cationic polymer wherein the cationic polymers have charge densities, on a solids basis, in the range of 1.00 to 12.00 meq/g, and starch; wherein the ratio of component A to component B is from 99:1 to 80:20; and wherein the ratio of component A plus component B to starch is from 1:105 to 1:1. 16. The process of claim 15 wherein component B is prepared from a vinyl or allyl monomer bearing amine functionality, wherein the molecular weight of component A is from 30,000 to about 300,000 Daltons, wherein the molecular weight of component B is from 50,000 to about 600,000 Daltons, and wherein the viscosity of the composition is less than 1000 centipoise at a temperature of 60° C. 17. The process of claim 16 wherein component B comprises a vinylamine containing polymer and wherein component A is anionic.
Smigo John G. (Whitehall PA) Robeson Lloyd M. (Macungie PA) Davidowich George (Allentown PA) Miller Gerald D. (Emmaus PA) Carroll William E. (Orefield PA), Crosslinked vinyl alcohol/vinylamine copolymers for dry end paper addition.
Brunnmueller Fritz (Limburgerhof DEX) Schneider Rolf (Mannheim DEX) Kroener Michael (Mannheim DEX) Mueller Hans (Ludwigshafen DEX) Linhart Friedrich (Heidelberg DEX), Linear basic polymers, their preparation and their use.
Castro, David J.; Lowe, Robert M.; Liu, Mei, Method of increasing paper bulk strength by using a diallylamine acrylamide copolymer in a size press formulation containing starch.
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