Container for containing cellulose resin composition and package comprising same and cellulose resin composition

Patent metadata

Field	Value
Publication number	US-12330848-B2
Application number	US-202017608227-A
Country	US
Kind code	B2
Filing date	May 21, 2020
Priority date	May 21, 2019
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

The purpose of the present invention is to provide: a container in which a cellulose resin composition can be stored without discoloring with the lapse of time; a package comprising a cellulose resin composition and the container; a method in which a cellulose resin composition is inhibited from discoloring by using the container; and a method for producing a molded resin object, the method including using the container. The container, which is for containing a cellulose resin composition comprising a thermoplastic resin and cellulose, includes a high-lignin-content member, which has a lignin content of 10 mass % or higher, and a low-lignin-content member, which has a lignin content of 1 mass % or less, and has a surface to be in contact with the cellulose resin composition, the whole of the surface being constituted of the low-lignin-content member.

First claim

The invention claimed is:

1. A package comprising a container and a cellulose resin composition that includes a thermoplastic resin and cellulose, housed in the container, wherein:
the container comprises a high-lignin-content member with a lignin content of 10 mass % or greater and a low-lignin-content member with a lignin content of 1 mass % or lower, and
the whole of the surface of the container to be in contact with the cellulose resin composition is constituted of the low-lignin-content member.

2. The package according to claim 1 , wherein the lignin content of the cellulose is 20 mass % or lower.

3. The package according to claim 2 , wherein:
the lignin content (Lo) of the high-lignin-content member, the lignin content (Li) of the low-lignin-content member and the lignin content (Lc) of the cellulose satisfy the relationship represented by the following formula:
Lo>Lc≥Li.

4. The package according to claim 1 , wherein the water vapor permeability of the low-lignin-content member as measured by the method of JIS Z0208:1976 is 50 g/m 2 ·24 h or lower.

5. The package according to claim 1 , which comprises an external body composed of the high-lignin-content member and an internal body composed of the low-lignin-content member.

6. The package according to claim 1 , wherein:
the external body is a box or bag, and
the internal body is a sheet that is either anchored or not anchored to the external body.

7. The package according to claim 1 , wherein the yellowness index (YI) of the high-lignin-content member is 20 or greater.

8. The package according to claim 1 , wherein the high-lignin-content member is a paper material obtained from unbleached pulp and/or waste paper.

9. The package according to claim 1 , wherein the cellulose is cellulose nanofibers.

10. The package according to claim 1 , wherein the cellulose resin composition is in the form of pellets.

11. The package according to claim 1 , wherein 0.01 kg to 550 kg of the cellulose resin composition is housed in the container.

12. The package according to claim 1 , wherein the water absorption percentage of the cellulose resin composition as measured by the method of JIS K0113:2005 is 1000 ppm by mass or lower.

13. The package according to claim 1 , wherein when the package is subjected to high-temperature, high-humidity treatment for 720 hours in air at ordinary pressure at a temperature of 60° C. and a relative humidity of 75%, the difference between the yellowness index (YI) before high-temperature, high-humidity treatment and the yellowness index (YI) after high-temperature, high-humidity treatment of the cellulose resin composition is 20 or less.

14. The package according to claim 1 , wherein the thermoplastic resin excludes a polyester-based resin.

15. The package according to claim 1 , wherein the thermoplastic resin excludes polylactic acid (PLA).

16. A container for containing a cellulose resin composition that includes a thermoplastic resin and cellulose, wherein:
the container comprises a high-lignin-content member with a lignin content of 10 mass % or greater and a low-lignin-content member with a lignin content of 1 mass % or lower, and
the whole of the surface of the container to be in contact with the cellulose resin composition is constituted of the low-lignin-content member.

17. The container according to claim 16 , wherein:
the lignin content (Lc) of the cellulose is 20 mass % or lower, and
the lignin content (Lo) of the high-lignin-content member, the lignin content (Li) of the low-lignin-content member and the lignin content (Lc) of the cellulose satisfy the relationship represented by the following formula:
Lo>Lc≥Li.

18. The container according to claim 16 , wherein the water vapor permeability of the low-lignin-content member as measured by the method of JIS Z0208:1976 is 50 g/m 2 ·24 h or lower.

19. The container according to claim 16 , which comprises an external body composed of the high-lignin-content member and an internal body composed of the low-lignin-content member.

20. The container according to claim 16 , wherein:
the external body is a box or bag, and
the internal body is a sheet that is either anchored or not anchored to the external body.

21. The container according to claim 16 , wherein the yellowness index (YI) of the high-lignin-content member is 20 or greater.

22. The container according to claim 16 , wherein the high-lignin-content member is a paper material obtained from unbleached pulp and/or waste paper.

23. The container according to claim 16 , wherein the low-lignin-content member includes a polyolefin.

Assignees

• Asahi Chemical Ind

Inventors

• Ueno Koichi

Classifications

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• D21C3/00

  Pulping cellulose-containing materials (digesters D21C7/00) · CPC title

• C08L97/02

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• B65D81/24

  Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants (with thermal insulation B65D81/38) · CPC title