Polymer complex

Patent metadata

Field	Value
Publication number	US-12410309-B2
Application number	US-202117767315-A
Country	US
Kind code	B2
Filing date	May 31, 2021
Priority date	May 29, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The present disclosure relates to a polymer complex containing microcellulose fibers comprising nanofibrils and fine particles; and a polymer matrix comprising a polyester resin. According to the present disclosure, there is provided a polymer complex capable of exhibiting excellent mechanical properties while being environmentally friendly by including cellulose fibers as a reinforcing material.

First claim

The invention claimed is:

1. A polymer complex comprising microcellulose fibers; and a polymer matrix,
wherein the microcellulose fibers comprise nanofibrils and fine particles, and the microcellulose fibers are fibrillated by growth of the fine particles on the microcellulose fibers,
wherein the polymer matrix comprises a polyester resin,
wherein the nanofibrils are bonded to a surface of the microcellulose fibers, and the fine particles are bonded to the nanofibrils or bonded to the surface or inside of the microcellulose fibers, and
wherein the fine particles are particles with a minor axis diameter of 0.01 μm to 10 μm.

2. The polymer complex of claim 1 ,
wherein the fine particles comprise one or more metal particles of copper, zinc, calcium, aluminum, iron, silver, platinum, palladium, ruthenium, iridium, rhodium, osmium, chromium, cobalt, nickel, manganese, vanadium, molybdenum, magnesium, strontium, titanium, zirconium, hafnium, and gallium, or silicon oxide particles.

3. The polymer complex of claim 1 ,
wherein the fine particles are included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the microcellulose fibers.

4. The polymer complex of claim 1 ,
wherein the fine particles comprise spherical fine particles having a diameter of 0.01 μm to 10 μm, columnar particles having a diameter of 0.01 μm to 10 μm on one axis and a diameter of 0.02 μm to 30 μm on another axis, or a mixture thereof.

5. The polymer complex of claim 1 ,
wherein the microcellulose fibers have a minor axis diameter of 1 μm to 30 μm, and the nanofibrils have a minor axis diameter of 10 nm to 400 nm.

6. The polymer complex of claim 1 ,
wherein the polymer matrix is an aliphatic-aromatic copolyester resin.

7. The polymer complex of claim 1 ,
wherein the polymer matrix comprises at least one of poly(ethylene adipate-co-terephthalate), poly(butylene adipate-co-terephthalate), poly(ethylene succinate-co-terephthalate), poly(butylene succinate-co-terephthalate), poly(ethylene adipate-co-succinate-co-terephthalate), or poly(butylene adipate-co-succinate-co-terephthalate).

8. The polymer complex of claim 1 ,
wherein the polymer complex contains 60 to 95 wt % of the polymer matrix; and 5 to 40 wt % of the microcellulose fibers.

9. The polymer complex of claim 1 ,
further comprising a compatibilizer.

10. The polymer complex of claim 1 ,
which has a yield strength measured according to ASTM D638-5 of 8 MPa to 30 MPa.

11. The polymer complex of claim 1 ,
which has a tensile strength measured according to ASTM D638-5 of 15 MPa to 30 MPa.

12. The polymer complex of claim 1 ,
which has an elastic modulus measured according to ASTM D638-5 of 120 MPa to 800 MPa.

13. The polymer complex of claim 8 ,
wherein the compatibilizer is a modified polyolefin.

14. The polymer complex of claim 13 ,
wherein the modified polyolefin is polypropylene or polyethylene in which 0.1 to 10 wt % thereof is grafted with maleic anhydride.

15. The polymer complex of claim 8 ,
wherein the compatibilizer is contained in the polymer complex in an amount of 0.1 to 15 wt %.

Assignees

• Lg Chemical Ltd

Inventors

• Park Chee Sung
• Park Minsung
• Jeon Kwang Seoung
• Jeon Harim

Classifications

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• D01F2/28

  from organic cellulose esters or ethers, e.g. cellulose acetate · CPC title

• C08L67/02 Primary

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• D10B2505/02

  Reinforcing materials; Prepregs · CPC title

• D10B2201/00

  Cellulose-based fibres, e.g. vegetable fibres · CPC title