Polysaccharide coatings for paper

Patent metadata

Field	Value
Publication number	US-11230812-B2
Application number	US-201615756659-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Oct 26, 2015
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

Coating compositions that can provide grease and oil resistant coating for substrates, especially paper and textile substrates, are disclosed. The coating compositions comprise water insoluble α-(1,3-glucan) polymer and/or dextran polymer and optionally other additives.

First claim

What is claimed is:

1. A coated substrate that comprises: a substrate and wherein at least a portion of the substrate is coated with a continuous layer of a coating composition,
wherein the coating composition comprises polyvinyl alcohol and a water-insoluble α-1,3-glucan polymer having 90% or greater α-1,3-glycosidic linkages, and the substrate is paper, paper board, cardboard, or corrugated board.

2. The coated substrate of claim 1 , wherein the water-insoluble α-1,3-glucan polymer comprises greater than or equal to 95% α-1,3-glycosidic linkages.

3. The coated substrate of claim 1 , wherein the coating composition further comprises one or more additives.

4. The coated substrate of claim 1 , wherein the coating composition is essentially free from starch or hydroxyalkyl starch.

5. The coated substrate of claim 1 , wherein the water-insoluble α-1,3-glucan polymer has greater than or equal to 99% α-1,3-glycosidic linkages.

6. The coated substrate of claim 1 , wherein the coated substrate resists grease and/or oil.

7. The coated substrate of claim 1 , wherein the continuous layer is dry and has a thickness in the range of 0.1 to 50 micrometers.

8. The coated substrate of claim 1 , wherein the substrate is paper.

9. The coated substrate of claim 1 , wherein the water-insoluble α-1,3-glucan polymer has less than 1% α-1,3,6-glycosidic branch points.

10. The coated substrate of claim 1 , wherein the water-insoluble α-1,3-glucan polymer has a number average degree of polymerization in the range of 55 to 10,000.

11. The coated substrate of claim 1 , wherein the water-insoluble α-1,3-glucan polymer consists of α-1,3-glucan.

12. The coated substrate of claim 1 , wherein grease is in contact with the continuous layer of the coating composition, but the grease is not in contact with the substrate.

13. The coated substrate of claim 1 , wherein oil is in contact with the continuous layer of the coating composition, but the oil is not in contact with the substrate.

Assignees

• Nutrition & Biosciences Usa 4 Inc

Inventors

• Behabtu Natnael

Classifications

• C09D105/02

  Dextran; Derivatives thereof · CPC title

• C08L5/00

  Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00 · CPC title

• C08L5/02

  Dextran; Derivatives thereof · CPC title

• D21H21/16

  Sizing or water-repelling agents · CPC title

• D06M2200/11

  Oleophobic properties · CPC title