Glue-bonded multi-ply absorbent sheet

Patent metadata

Field	Value
Publication number	US-9822285-B2
Application number	US-201615000071-A
Country	US
Kind code	B2
Filing date	Jan 19, 2016
Priority date	Jan 28, 2015
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A multi-ply absorbent sheet includes a first absorbent ply of cellulosic sheet; a second absorbent ply of cellulosic sheet; and a ply bonding adhesive interposed between the first absorbent ply and the second absorbent ply, the ply-bonding adhesive thereby adhering said absorbent plies together. The ply-bonding adhesive comprises polyvinyl alcohol and nanofibrillated cellulose. In a particularly preferred embodiment the adhesive is applied as a dilute aqueous composition to tissue plies and the nanofibrillated cellulose has a Characteristic Breaking Length of 6.5 km or above.

First claim

What is claimed is:

1. A multi-ply absorbent sheet comprising:
(a) a first absorbent ply of cellulosic sheet;
(b) a second absorbent ply of cellulosic sheet; and
(c) a ply bonding adhesive interposed between said first absorbent ply and said second absorbent ply, said ply-bonding adhesive adhering said absorbent plies together,

wherein said ply-bonding adhesive comprises polyvinyl alcohol and nanofibrillated cellulose.

2. The multi-ply absorbent sheet according to claim 1 , wherein said nanofibrillated cellulose has a Characteristic Breaking Length of at least 3 km.

3. The multi-ply absorbent sheet according to claim 1 , wherein said nanofibrillated cellulose has a Characteristic Breaking Length of from 4.5 km to 9 km.

4. The multi-ply absorbent sheet according to claim 1 , wherein said nanofibrillated cellulose exhibits a Characteristic Nanofiber Viscosity reduction of at least 80% as the shear rate is increased from 5 sec −1 to 500 sec −1 .

5. The multi-ply absorbent sheet according to claim 1 , wherein the adhesive contains from 0.5% by weight to 50% by weight of nanofibrillated cellulose, based on the weight of polyvinyl alcohol.

6. The multi-ply absorbent sheet according to claim 1 , wherein the adhesive contains from 1% by weight to 30% by weight of nanofibrillated cellulose, based on the weight of polyvinyl alcohol.

7. The multi-ply absorbent sheet according to claim 1 , wherein the adhesive contains from 1.5% by weight to 20% by weight of nanofibrillated cellulose, based on the weight of polyvinyl alcohol.

8. The multi-ply tissue sheet according to claim 1 , wherein the adhesive is applied between the plies as an aqueous composition containing from 1.5% to 10% by weight polyvinyl alcohol.

9. The multi-ply tissue sheet according to claim 1 , wherein the adhesive is applied between the plies as an aqueous composition containing from 1.5% to 6% by weight polyvinyl alcohol.

10. The multi-ply absorbent sheet according to claim 1 , wherein the adhesive is applied between the plies in a discontinuous pattern.

11. The multi-ply absorbent sheet according to claim 10 , wherein the discontinuous pattern corresponds to a pattern of raised embossments on one of the absorbent plies of cellulosic sheet.

12. The multi-ply absorbent sheet according to claim 1 , wherein the multi-ply absorbent sheet is a multi-ply tissue sheet composed predominantly of hardwood papermaking fiber.

13. The multi-ply absorbent sheet according to claim 1 , wherein the multi-ply absorbent sheet is a multi-ply towel sheet composed predominantly of softwood fiber.

14. The multi-ply absorbent sheet according to claim 1 , wherein the multi-ply sheet comprises a third absorbent ply of cellulosic sheet plied together with the first and second ply.

15. The multiply absorbent sheet according to claim 1 , consisting of three plies laminated together, wherein the ply bonding adhesive is applied only between two plies prior to lamination.

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Sumnicht Daniel W
• Yu Zhiying
• Vaijapurkar Siddharth S

Classifications

• C09J129/04 Primary

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09J101/02

  Cellulose; Modified cellulose · CPC title