Resin particles comprising a biodegradable resin and a specific amount of a metal element

Patent metadata

Field	Value
Publication number	US-11879040-B2
Application number	US-202117505647-A
Country	US
Kind code	B2
Filing date	Oct 20, 2021
Priority date	Mar 26, 2021
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

Resin particles include mother particles containing a biodegradable resin and a plasticizer, in which an amount of a metal element having an ionic valence of 2 or more, obtained by fluorescent X-ray analysis, is 0.002% by mass or more and 2.0% by mass or less with respect to a total amount of the resin particles.

First claim

What is claimed is:

1. Resin particles comprising:
mother particles containing a biodegradable resin and a plasticizer,
wherein an amount of a metal element having an ionic valence of 2 or more, obtained by fluorescent X-ray analysis, is 0.002% by mass or more and 2.0% by mass or less with respect to a total amount of the resin particles.

2. The resin particles according to claim 1 ,
wherein the metal element having an ionic valence of 2 or more includes at least one selected from the group consisting of Ca, Mg, Al, and Fe.

3. The resin particles according to claim 2 ,
wherein the metal element having an ionic valence of 2 or more includes Ca.

4. The resin particles according to claim 3 ,
wherein the biodegradable resin is cellulose acylate.

5. The resin particles according to claim 4 ,
wherein the cellulose acylate is at least one selected from the group consisting of cellulose diacetate, cellulose acetate propionate, and cellulose acetate butyrate.

6. The resin particles according to claim 5 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

7. The resin particles according to claim 4 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

8. The resin particles according to claim 3 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

9. The resin particles according to claim 2 ,
wherein the biodegradable resin is cellulose acylate.

10. The resin particles according to claim 9 ,
wherein the cellulose acylate is at least one selected from the group consisting of cellulose diacetate, cellulose acetate propionate, and cellulose acetate butyrate.

11. The resin particles according to claim 10 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

12. The resin particles according to claim 9 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

13. The resin particles according to claim 2 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

14. The resin particles according to claim 1 ,
wherein the biodegradable resin is cellulose acylate.

15. The resin particles according to claim 14 ,
wherein the cellulose acylate is at least one selected from the group consisting of cellulose diacetate, cellulose acetate propionate, and cellulose acetate butyrate.

16. The resin particles according to claim 15 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

17. The resin particles according to claim 14 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

18. The resin particles according to claim 1 ,
wherein a ratio (B/A) of a content (B) of the plasticizer to a content (A) of the biodegradable resin is 0.1 or more and 0.8 or less.

19. The resin particles according to claim 1 , further comprising:
a first layer containing at least one cationic resin of polyalkyleneimine, polyallylamine, or polyvinylamine on a surface of the mother particles; and
a second layer containing an anionic or nonionic hydrophobic compound, in this order.

20. Resin particles comprising:
mother particles containing a biodegradable resin and a plasticizer,
wherein a ratio (Rs/Rp) of a circle-equivalent diameter Rs of an aggregate to a circle-equivalent diameter Rp of a primary particle after storage for 3 months under a condition of 50° C. and 50% RH is less than 1.5, and
a durometer hardness is less than 75.

Assignees

• Fujifilm Business Innovation Corp

Inventors

• Yoshida Kazusei
• Oki Masahiro
• Yoshikawa Hideaki
• Yao Kenji
• Taguchi Tetsuya

Classifications

• C08J3/126 Primary

  Polymer particles coated by polymer, e.g. core shell structures · CPC title

• C08J7/042

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• C08K5/11 Primary

  of acyclic polycarboxylic acids · CPC title

• C08L1/14

  Mixed esters, e.g. cellulose acetate-butyrate · CPC title

• C08L39/02

  Homopolymers or copolymers of vinylamine · CPC title