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US 12,534,854 B2Granted
Wet laid paper and paperboard products with high wet strength and method of making the same
AssigneeFirst Quality Tissue, LLC
InventorsJames E. Sealey, II, Kevin P. Brennan, Justin S. Pence, Richard James Riehle, Daniel Mark Henn
Life of this patent
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Abstract
A method of making paper and paperboard products, including absorbent structures, where the method includes mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide (“GPVM”) adducts and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.
Claims17
A paper or paperboard product, comprising:
- lignocellulosic and/or cellulosic fibers;
- ultra-high molecular weight glyoxalated polyvinylamide (UHMW GPVM) adducts and high molecular weight anionic polyacrylamide (HMW APAM) complex, the UHMW GPVM adducts and HMW APAM complex being present in the paper or paperboard product by an amount of at least 0.05% by weight;
- a dichloropropanol concentration of less than 50 ppb;
- a chloropropanediol concentration of less than 300 ppb;
- from 0 to 0.09% by weight polyaminoamide-epihalohydrin;
- and
- a wet tensile strength of at least 10% of the value of a dry tensile strength of the product,
- wherein the UHMW GPVM adducts and HMW APAM complex comprises:
- (i) HMW APAM having a weight average molecular weight (Mw) of from greater than 500,000 to 2,000,000 daltons;
- (ii) UHMW GPVM having a weight average molecular weight (Mw) of from greater than 2,000,000 to about 50,000,000 daltons;
- or (iii) both (i) and (ii).
8 more elements
A paper or paperboard product comprising:
- from 80 to 99% by weight lignocellulosic and/or cellulosic fibers;
- ultra-high molecular weight glyoxalated polyvinylamide (UHMW GPVM) adducts and high molecular weight anionic polyacrylamide (HMW APAM) complex, the UHMW GPVM adducts and HMW APAM complex being present in the paper or paperboard product by an amount of 0.05 to 1.5% by weight;
- and
- from 0 to 0.5% by weight polyvinylamine,
- wherein the UHMW GPVM adducts and HMW APAM complex comprises:
- (i) HMW APAM having a weight average molecular weight (Mw) of from greater than 500,000 to 2,000,000 daltons;
- (ii) UHMW GPVM adducts having a weight average molecular weight (Mw) of from greater than 2,000,000 to about 50,000,000 daltons;
- or (iii) both (i) and (ii).
5 more elements
A method of making a paper or paperboard product, comprising:
- forming an aqueous stock mixture comprising from 80 to 99% by weight solids lignocellulosic and/or cellulosic fibers, ultra-high molecular weight glyoxalated polyvinylamide (UHMW GPVM) adducts and high molecular weight anionic polyacrylamide (HMW APAM) complex, the UHMW GPVM adducts and HMW APAM complex being present in the stock mixture by an amount of 0.05 to 1.5% by weight solids, from 0 to 0.09% by weight solids of a polyaminoamide-epihalohydrin, and from 0 to 0.5% by weight solids of a polyvinylamine;
- and
- sheeting and drying the aqueous stock mixture, thereby giving the product,
- wherein the UHMW GPVM adducts and HMW APAM complex comprises:
- (i) HMW APAM having a weight average molecular weight (Mw) of from greater than 500,000 to 2,000,000 daltons;
- (ii) UHMW GPVM adducts having a weight average molecular weight (Mw) of from 8,000,000 to about 25,000,000 daltons;
- or (iii) both (i) and (ii).
4 more elements
Dependencies are inferred from the claim text.