# US 12,600,855 B2 · Biodegradation accelerator for biodegradable resin

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- Number: US 12,600,855 B2
- Document ID: US12600855B2
- Status: Granted
- Kind: B2
- Application number: 18/029,126
- Filed: 2021-10-20
- Published: 2023-11-16
- Granted: 2026-04-14
- Earliest claimed: 2020-10-20
- Assignees: Daicel Corporation
- Applicants: Daicel Corporation
- Inventors: Masahiko Itakura; Takayuki Ogihara; Shinichiro Imanishi; Shohei Yasuoka
- Web page: https://patentgrep.com/patent/US12600855B2

## CPC

- C08L 1/12: Cellulose acetate
- C08L 67/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence)
- A61L 31/148: {Materials at least partially resorbable by the body}
- A61L 31/16: Biologically active materials, e.g. therapeutic substances {(A61L31/047 takes precedence)}
- B29B 17/0412: {to large particles, e.g. beads, granules, flakes, slices}
- C08J 11/105: {by treatment with enzymes}
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08L 101/16: the macromolecular compounds being biodegradable
- B09B 3/60: Biochemical treatment, e.g. by using enzymes
- C08L 2201/06: Biodegradable
- C08L 2205/16: Fibres; Fibrils
- Y02W 30/62: Plastics recycling; Rubber recycling
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B09B: DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

[Problem] To provide a biodegradation accelerator for a biodegradable resin to accelerate biodegradation of the biodegradable resin. [Solution] A biodegradation accelerator for a biodegradable resin, the biodegradation accelerator containing a regenerated cellulose, in which the regenerated cellulose is selected from the group consisting of fibers, molded products including films, powders, cotton-like objects, and intermediate molded bodies, and a biodegradation speed for a biodegradable resin is accelerated compared to a case where the biodegradation accelerator for a biodegradable resin is not used.

## Claims

### Claim 1

A biodegradable resin composition comprising a biodegradation accelerator for a biodegradable resin and a biodegradable resin,
the biodegradation accelerator comprising a regenerated cellulose, wherein
the regenerated cellulose is selected from the group consisting of fibers, molded products including films, powders, cotton-like objects, and intermediate molded bodies,
a biodegradation speed for a biodegradable resin is accelerated compared to a case where the biodegradation accelerator for a biodegradable resin is not used, and
a content proportion of the biodegradation accelerator for a biodegradable resin is from 0.1 to 50 mass % in terms of a regenerated cellulose in the biodegradable resin composition.

### Claim 2 (depends on 1)

The biodegradable resin composition according to claim 1, wherein a content proportion of the biodegradation accelerator for a biodegradable resin is from 0.1 to 40 mass % in terms of a regenerated cellulose in the biodegradable resin composition.

### Claim 3 (depends on 1)

The biodegradable resin composition according to claim 1, wherein the biodegradable resin is selected from the group consisting of cellulose ester, starch polyester, polylactic acid (PLA), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), polylactic acid/polycaprolactone copolymers, polyglycolic acid (PGA), polylactic acid/polyether copolymers, butanediol/long-chain dicarboxylic acid copolymers, polybutylene adipate/terephthalate (PBAT), polytetramethylene adipate-co-terephthalate, polyethylene terephthalate succinate (PETS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyvinyl alcohol (PVA).

### Claim 4 (depends on 1)

The biodegradable resin composition according to claim 1, wherein the biodegradable resin is a cellulose ester selected from the group consisting of cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, polycaprolactone grafted cellulose acetate, acetyl methyl cellulose, acetyl ethyl cellulose, acetyl propyl cellulose, acetyl hydroxyethyl cellulose, and acetyl hydroxypropyl cellulose.

### Claim 5 (depends on 1)

A biodegradable resin molded product comprising the biodegradable resin composition according to claim 1.

### Claim 6 (depends on 5)

The biodegradable resin molded product according to claim 5, wherein the biodegradable resin molded product has biodegradability in sea water, fresh water, and soil.

### Claim 7 (depends on 5)

The biodegradable resin molded product according to claim 5, wherein the biodegradable resin molded product is an article including a fishing implement used in fishery and a container for containing caught marine products.

### Claim 8 (depends on 7)

The biodegradable resin molded product according to claim 7, wherein the biodegradable resin is polylactic acid.

### Claim 9 (depends on 5)

A method for treating the biodegradable resin molded product according to claim 5, the method comprising incubating the biodegradable resin molded product, with the biodegradable resin and the biodegradation accelerator being in contact with each other.

### Claim 10 (depends on 9)

The method for treating the biodegradable resin molded product according to claim 9, wherein the biodegradable resin molded product is mechanically crushed or mechanically shredded.

### Claim 11 (depends on 9)

The method for treating the biodegradable resin molded product according to claim 9, wherein the biodegradable resin molded product contains the biodegradable resin selected from the group consisting of cellulose ester, starch polyester, polylactic acid (PLA), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH), polylactic acid/polycaprolactone copolymers, polyglycolic acid (PGA), polylactic acid/polyether copolymers, butanediol/long-chain dicarboxylic acid copolymers, polybutylene adipate/terephthalate (PBAT), polytetramethylene adipate-co-terephthalate, polyethylene terephthalate succinate (PETS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyvinyl alcohol (PVA).