# US 2023/0407573 A1 · Wet laid disposable absorbent structures with high wet strength and method of making the same

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- Number: US 2023/0407573 A1
- Document ID: US20230407573A1
- Status: Published application
- Kind: A1
- Application number: 17/842,248
- Filed: 2022-06-16
- Published: 2023-12-21
- Earliest claimed: 2022-06-16
- Assignees: First Quality Tissue, LLC
- Applicants: First Quality Tissue, LLC
- Inventors: James E. Sealey, II; Kevin P. Brennan; Justin S. Pence
- Web page: https://patentgrep.com/patent/US20230407573A1

## CPC

- D21H 21/20: Wet strength agents
- D21H 17/34: obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H 17/55: Polyamides; Polyaminoamides; Polyester-amides
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

## Abstract

A method of making an absorbent structure including mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide adducts (“GPVM”) and/or high molecular weight (“HMW”), glyoxalated polyacrylamide and/or high cationic charge glyoxalated polyacrylamide (“GPAM”) copolymers and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A retail roll paper towel product comprising:
a two ply wet laid product with cross direction wet strength of 80 to 200 N/m and basis weight range of 38-45 g/m2, where in the retail roll paper towel contains 0 to 0.1% by weight polyaminoamide-epihalohydrin.

### Claim 10 (depends on 9)

The retail roll paper towel product of claim 9, wherein the product is free from latex.

### Claim 11 (depends on 9)

The retail roll paper towel product of claim 9, wherein the product is wet laid.

### Claim 12 (depends on 9)

The retail roll paper towel product of claim 9, wherein the product is creped.

### Claim 13 (depends on 9)

The retail roll paper towel product of claim 9, wherein the product has a Gravimetric Absorption Testing System (GATS) absorbency from 8 to 18 g/g.

### Claim 14 (depends on 9)

The retail roll paper towel product of claim 9, further comprising a polyamine polymer of a functionalized vinylamine-containing base polymer comprising randomly distributed repeating monomer units having the following formula (I), (II) and (III),
wherein R is a reacted α, β-unsaturated alkyl carbonyl compound through Michael addition by vinylamine in the polymer; n, p and q are the numbers indicating mole % of the repeating units of formula (I), (II) and (III) present in the functionalized vinylamine-containing polymer; and wherein n is from about 5 mole % to about 98 mole %, p is from about 1 mole % to about 80 mole %, q is from about 1 mole % to about 30 mole % the mole ratio of the functionalized vinylamine-containing base polymer to the vinyl monomer in the graft polymer is in the range of from about 10:90 to about 50:50.

### Claim 15 (depends on 14)

The retail roll paper towel product of claim 14, wherein the product is free from plastics or extruded polymers.

### Claim 16

A retail roll paper towel product comprising:
a two ply wet laid product with cross direction wet strength of 80 to 200 N/m and caliper is 700 to 1300 microns, where in the retail roll paper towel contains 0 to 0.1% by weight polyaminoamide-epihalohydrin.

### Claim 17 (depends on 16)

The retail roll paper towel product of claim 16, wherein the product is free from latex.

### Claim 18 (depends on 16)

The retail roll paper towel product of claim 16, wherein the product is wet laid.

### Claim 19 (depends on 16)

The retail roll paper towel product of claim 16, wherein the product is creped.

### Claim 20 (depends on 16)

The retail roll paper towel product of claim 16, wherein the product has a Gravimetric Absorption Testing System (GATS) absorbency from 8 to 18 g/g.

### Claim 21 (depends on 16)

The retail roll paper towel product of claim 16, further comprising a polyamine polymer of a functionalized vinylamine-containing base polymer comprising randomly distributed repeating monomer units having the following formula (I), (II) and (III),
wherein R is a reacted α, β-unsaturated alkyl carbonyl compound through Michael addition by vinylamine in the polymer; n, p and q are the numbers indicating mole % of the repeating units of formula (I), (II) and (III) present in the functionalized vinylamine-containing polymer; and wherein n is from about 5 mole % to about 98 mole %, p is from about 1 mole % to about 80 mole %, q is from about 1 mole % to about 30 mole % the mole ratio of the functionalized vinylamine-containing base polymer to the vinyl monomer in the graft polymer is in the range of from about 10:90 to about 50:50.

### Claim 22 (depends on 21)

The retail roll paper towel product of claim 21, wherein the product is free from plastics or extruded polymers.