Use of molar mass controlled cellulose

Patent metadata

Field	Value
Publication number	US-12252602-B2
Application number	US-202217851874-A
Country	US
Kind code	B2
Filing date	Jun 28, 2022
Priority date	Feb 10, 2017
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

According to an example aspect of the present invention, there is provided a use of molar mass controlled cellulose in injection molding, extrusion and three dimensional printing applications.

First claim

The invention claimed is:

1. A method for manufacturing thermoplastic cellulose material comprising:
decreasing a molar mass of a raw cellulose material via hydrolysis, excluding total hydrolysis, to generate a hydrolyzed molar mass controlled cellulose, wherein the hydrolysis provides the hydrolyzed molar mass controlled cellulose with an average molecular mass of 30 to 300 kD and reduces an average molecular mass of the raw cellulose material by 40-85%; and
performing a long chain fatty acid modification on the hydrolyzed molar mass controlled cellulose to produce the thermoplastic cellulose material.

2. The method of claim 1 , wherein the thermoplastic cellulose material comprises a cellulose ester or ether having a chain length between 6 and 30 carbon atoms.

3. The method of claim 2 , wherein the cellulose ester or ether has a chain length between 6 and 18 carbon atoms.

4. The method of claim 1 , wherein the thermoplastic cellulose material comprises a degree of substitution (DS) of from 0.7 to 30.

5. The method of claim 1 , wherein the long chain fatty acid modification comprises a member selected from the group consisting of esterification, etherification, and hydroxyalkylation.

6. The method of claim 1 , wherein the long chain fatty acid modification comprises heterogeneous or homogeneous esterification of the hydrolyzed molar mass controlled cellulose.

7. The method of claim 1 , wherein the thermoplastic cellulose material is compostable and/or recyclable.

8. The method of claim 1 , wherein the thermoplastic cellulose material is reprocessable at least two times.

9. The method of claim 1 , wherein the cellulose raw material is selected from the group consisting of native softwood pulp, native hardwood pulp, annual plant pulp, softwood sulphite dissolving grade pulp, hardwood sulphite dissolving grade pulp, ozone treated hydrolyzed pulp, and enzyme treated pulp.

10. The method of claim 1 , wherein the average molecular mass is reduced to 40 to 200 kD.

11. The method of claim 1 , wherein the thermoplastic cellulose material comprises cellulose palmitate.

12. The method of claim 1 , wherein the thermoplastic cellulose material comprises granules having a diameter of 0.5 to 4 mm.

13. The method of claim 1 , further comprising activating the hydrolyzed molar mass controlled cellulose prior to performing the long chain fatty acid modification.

14. The method of claim 12 , wherein the granules are free from external plasticizers.

Assignees

• Teknologian Tutkimuskeskus Vtt Oy

Inventors

• Willberg-Keyriläinen Pia
• Ropponen Jarmo
• Harlin Ali
• Talja Riku

Classifications

• C08B3/10 Primary

  with five or more carbon-atoms, {e.g. valerate} · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• B33Y40/00

  Auxiliary operations or equipment, e.g. for material handling · CPC title

• B29K2001/08

  Cellulose derivatives · CPC title

• B29B13/00

  Conditioning or physical treatment of the material to be shaped (chemical aspects C08J3/00 {; heating, cooling or curing during shaping B29C35/00; thermal after-treatment B29C71/02}) · CPC title