Cellulose ester composition and articles made therefrom

Patent metadata

Field	Value
Publication number	US-12351703-B2
Application number	US-202117531336-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Nov 20, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A polymer composition containing cellulose acetate in combination with one or more plasticizers and one or more biodegradable fillers. The biodegradable fillers can include monosaccharides, polysaccharides, esters thereof, and mixtures thereof. The polymer composition is formulated so as to have properties similar to petroleum-based polymers for producing, for example, single-use biodegradable articles.

First claim

What is claimed:

1. A polymer composition comprising:
a cellulose ester polymer;
a plasticizer comprising an acetylglycerol or polyethylene glycol;
an acid scavenger; and
a biodegradable filler, the biodegradable filler comprising a monosaccharide, a monosaccharide ester, a polysaccharide, a polysaccharide ester, or mixtures thereof.

2. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises fibers.

3. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises a powder or particles.

4. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises dextran, a starch, a modified starch, a hydrolyzed starch, a modified hydrolyzed starch, alpha-1,3-glucan or mixtures thereof.

5. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises bast fibers.

6. A polymer composition as defined in claim 5 , wherein the bast fibers comprise hemp.

7. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises cellulose fibers, sisal fibers, viscose fibers, or mixtures thereof.

8. A polymer composition as defined in claim 7 , wherein the cellulose fiber comprises hardwood fibers, softwood fibers, or mixtures thereof.

9. A polymer composition as defined in claim 1 , wherein the biodegradable filler comprises alpha cellulose or an engineered polysaccharide.

10. A polymer composition as defined in claim 1 , wherein one or more biodegradable fillers are present in the polymer composition in an amount from about 0.1% to about 75% by weight.

11. A polymer composition as defined in claim 1 , wherein one or more biodegradable fillers are present in the polymer composition in an amount from about 3% to about 25% by weight.

12. A polymer composition as defined in claim 1 , wherein the cellulose ester polymer comprises cellulose acetate having a degree of substitution of from about 1.3 to about 2.8.

13. A polymer composition as defined in claim 1 , wherein the acid scavenger comprises an alkali metal salt, an alkaline earth metal salt, a carbonate, an oxide, a hydroxide, an amine, or a mixture thereof.

14. A polymer composition as defined in claim 1 , wherein the plasticizer comprises monoacetin, diacetin, triacetin or mixtures thereof.

15. A polymer composition as defined in claim 1 , wherein the cellulose ester polymer is present in the composition in an amount of from about 15% to about 85% by weight and the plasticizer is present in the composition in an amount of from about 8% to about 40% by weight.

16. A polymer composition as defined in claim 1 , wherein the cellulose acetate consists essentially of cellulose diacetate.

17. An article made from the polymer composition as defined in claim 1 .

18. An article as defined in claim 17 , wherein the article is a beverage holder, a drinking straw, a hot beverage pod, a fork, a knife, a spoon, packaging, a container, a lid, or an interior automotive part.

19. A polymer composition as defined in claim 1 , wherein the polymer composition is in the form of extruded pellets, a film, or a foam.

20. An article as defined in claim 17 , wherein the article has been formed through injection molding or extrusion.

Assignees

• Celanese Int Corp
• Acetate Int Llc

Inventors

• Combs Michael
• Devanathan Narsi

Classifications

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2201/06

  Biodegradable · CPC title

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title