# US 12,760,163 B2 · Disposal method for polyester-containing release film and manufacturing method of polyester-containing object

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- Number: US 12,760,163 B2
- Document ID: US12760163B2
- Status: Granted
- Kind: B2
- Application number: 18/354,678
- Filed: 2023-07-19
- Published: 2024-12-05
- Granted: 2026-10-13
- Earliest claimed: 2023-06-02
- Assignees: Nan Ya Plastics Corporation
- Applicants: Nan Ya Plastics Corporation
- Inventors: Te-Chao Liao; Chao-Quan Wu; Ching-Yao Yuan
- Web page: https://patentgrep.com/patent/US12760163B2

## CPC

- C08J 11/08: using selective solvents for polymer components
- C08J 2367/00: Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- 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)

## Abstract

A disposal method for a polyester-containing release film including the following steps is provided: providing a release film, which includes a base material and a release layer, wherein at least a material of the base includes polyester, and providing an acid washing step or an alkali washing step to the release film for removing the release layer, and to obtain a polyester-containing solid material.

## Claims

### Claim 1

A disposal method for a polyester-containing release film, comprising:
providing a release film comprising a substrate and a release layer, wherein at least a material of the substrate comprises polyester;
performing an acid washing step to the release film for removing the release layer from the release film and obtaining a first solid matter containing polyester; and
performing an alkali washing step to the first solid matter for obtaining a second solid matter containing polyester.

### Claim 2 (depends on 1)

The disposal method for a polyester-containing release film according to claim 1, wherein the acid washing step comprises:
immersing the release film in an acid solution, wherein the acid solution comprises a mixture of dodecylbenzenesulfonic acid and paraffin oil at a weight ratio of 20:80 to 30:70.

### Claim 3 (depends on 1)

The disposal method for a polyester-containing release film according to claim 1, wherein the alkali washing step comprises:
immersing the first solid matter in an alkali solution, wherein the alkali solution comprises a sodium hydroxide aqueous solution at a concentration of 7 wt % to 13 wt %.

### Claim 4 (depends on 3)

The disposal method for a polyester-containing release film according to claim 3, wherein the alkali washing step further comprises:
heating the alkali solution to 50° C. to 70° C.

### Claim 5 (depends on 1)

The disposal method for a polyester-containing release film according to claim 1, wherein the release layer is formed by an aqueous release agent.

### Claim 6 (depends on 5)

The disposal method for a polyester-containing release film according to claim 5, wherein the aqueous release agent comprises hydrophilic silicone.

### Claim 7 (depends on 1)

The disposal method for a polyester-containing release film according to claim 1 is a volatile organic solvent-free process.