Flame-retardant polyester film

Patent metadata

Field	Value
Publication number	US-11753512-B2
Application number	US-202117199451-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Jul 15, 2020
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A flame-retardant polyester film and a method for manufacturing the same are provided. The flame-retardant polyester film includes a physically recycled polyester resin and a chemically recycled polyester resin. The physically recycled polyester resin is formed by a plurality of physically recycled polyester chips. The chemically recycled polyester resin is formed by a plurality of chemically recycled polyester chips and mixed with the physically recycled polyester resin. The plurality of chemically recycled polyester chips further includes chemically recycled electrostatic pinning polyester chips. The chemically recycled electrostatic pinning polyester chips contain electrostatic pinning additives, and the electrostatic pinning additives are metal salts. Expressed in percent by weight based on a total weight of the polyester film, a content of the electrostatic pinning additives in the polyester film is between 0.005% and 0.1% by weight. The flame-retardant polyester film further includes a flame-retardant additive.

First claim

What is claimed is:

1. A flame-retardant polyester film, comprising:
a physically recycled polyester resin formed by a plurality of physically recycled polyester chips; and
a chemically recycled polyester resin formed by a plurality of chemically recycled polyester chips and mixed with the physically recycled polyester resin, wherein the plurality of chemically recycled polyester chips further include chemically recycled electrostatic pinning polyester chips, and wherein the chemically recycled electrostatic pinning polyester chips contain at least one kind of electrostatic pinning additives, and the electrostatic pinning additives are metal salts;
wherein, expressed in percent by weight based on a total weight of the polyester film, a content of the electrostatic pinning additives in the polyester film is between 0.005% and 0.1% by weight;
wherein the polyester film further includes a flame-retardant additive, and the flame-retardant additive is dispersed in at least one of the physically recycled polyester resin and the chemically recycled polyester resin;
wherein the flame-retardant polyester film further comprises a black additive, and the black additive is selected from the group consisting of carbon black and black coloring materials; wherein, expressed in percent by weight based on the total weight of the polyester film, an added amount of the black additive is between 5% and 40% by weight.

2. The flame-retardant polyester film according to claim 1 , wherein the flame-retardant additive is a phosphorus flame retardant, a content of a phosphorus (P) element of the phosphorus flame retardant in the flame-retardant polyester film is between 10 ppm and 20,000 ppm, and the flame-retardant polyester film satisfies a flame-retardant standard of UL94 VTM-2 and above.

3. The flame-retardant polyester film according to claim 1 , wherein, expressed in percent by weight based on the total weight of the polyester film, a content of the physically recycled polyester resin is between 50% and 95% by weight, a content of the chemically recycled polyester resin is between 1% and 40% by weight, and a total content of the physically recycled polyester resin and the chemically recycled polyester resin is between 55% and 100% by weight.

4. The flame-retardant polyester film according to claim 1 , wherein the plurality of chemically recycled polyester chips further include chemically recycled slipping polyester chips; wherein the chemically recycled slipping polyester chips contain a slipping agent, and the slipping agent is selected from the group consisting of silicon dioxide particles, calcium carbonate particles, barium sulfate particles, polystyrene particles, silica gel particles and acrylic particles; wherein, based on 100 parts by weight of a total content of the polyester chips, a content of the chemically recycled slipping polyester chips is between 5 and 10 parts by weight relative to the total content of the polyester chips.

5. The flame-retardant polyester film according to claim 4 , wherein a particle size of the slipping agent is less than 2 micrometers; wherein, expressed in percent by weight based on the total weight of the polyester film, a content of the slipping agent in the polyester film is between 0.01% and 2% by weight, so that the polyester film has a transparency of not less than 85%.

6. The flame-retardant polyester film according to claim 1 , further comprising a slipping agent, wherein the slipping agent is selected from the group consisting of silicon dioxide, polystyrene, poly(methyl methacrylate), silica gel and acrylic; wherein, expressed in percent by weight based on the total weight of the polyester film, an added amount of the slipping agent is between 5% and 10% by weight.

7. The flame-retardant polyester film according to claim 1 , further comprising a matte additive, wherein the matte additive is selected from the group consisting of silicon dioxide particles, calcium carbonate particles, aluminum oxide particles and talc powder; wherein, expressed in percent by weight based on the total weight of the polyester film, an added amount of the matte additive is between 0.5% and 10% by weight.

8. The flame-retardant polyester film according to claim 1 , further comprising a white additive, wherein the white additive is selected from the group consisting of titanium dioxide, barium sulfate and calcium carbonate; wherein, expressed in percent by weight based on the total weight of the polyester film, an added amount of the white additive is between 5% and 40% by weight.

Assignees

• Nan Ya Plastics Corp

Inventors

• Yang Wen-Cheng
• Liao Te-Chao
• HSIAO Chia-Yen
• Chen hao-sheng

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J2300/30

  Polymeric waste or recycled polymer · CPC title

• Y02W30/62

  Plastics recycling; Rubber recycling · CPC title

• B29C48/022

  characterised by the choice of material · CPC title