Heat sealable polyester film
AssigneeNan Ya Plastics Corporation
InventorsWen-Cheng Yang, Te-Chao Liao, Chia-Yen Hsiao, Ching-Yao Yuan
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Abstract
A heat sealable polyester film and a method for manufacturing the same are provided. The heat sealable polyester film is made from a recycled polyester material. The heat sealable polyester film includes a base layer and a heat sealable layer formed on at least one surface of the base layer. The heat sealable layer is formed from a first polyester composition. A main component of the first polyester composition is regenerated polyethylene terephthalate and the first polyester composition further includes at least one of 1,4-butanediol, isophthalic acid, neopentyl glycol, and polybutylene terephthalate. A heat sealing temperature of the heat sealable polyester film ranges from 120° C. to 230° C.
Claims7
A heat sealable polyester film which is formed from a recycled polyester material, the heat sealable polyester film comprising:
- a base layer, comprising a main component of regenerated polyethylene terephthalate with a first melting temperature;
- and
- a heat sealable layer disposed on at least one surface of the base layer, the heat sealable layer formed from a first polyester composition, the first polyester composition consisting of regenerated polyethylene terephthalate and polybutylene terephthalate;
- wherein the regenerated polyethylene terephthalate includes a physically regenerated polyester resin and a chemically regenerated polyester resin, and the physically regenerated polyester resin is formed by fusing the polybutylene terephthalate and the recycled polyester material;
- wherein, based on a total weight of the physically regenerated polyester resin being 100 wt %, a content of PBT ranges from larger than 0 wt % to 30 wt %;
- wherein a heat sealing temperature of the heat sealable polyester film is lower than the first melting temperature in a range from 120° C. to 230° C.
A method for manufacturing a heat sealable polyester film, comprising:
- physically reproducing a part of a recycled polyester material to obtain physically regenerated polyester chips, and the physically regenerated polyester chips including physically regenerated polyester chips;
- chemically reproducing another part of the recycled polyester material to obtain chemically regenerated polyester chips, and the chemically regenerated polyester chips including chemically regenerated polyester chips and chemically regenerated electrostatic pinning polyester chips;
- mixing modified polyester chips with the physically regenerated polyester chips and the chemically regenerated polyester chips to form a raw material mixture;
- wherein the modified polyester chips are formed from the recycled polyester material,
- wherein the modified polyester chips consist of regenerated polyethylene terephthalate and polybutylene terephthalate, and is formed by fusing the polybutylene terephthalate and the recycled polyester material;
- wherein, based on a total weight of the physically regenerated modified polyester chips being 100 wt %, a content of PBT ranges from larger than 0 wt % to 30 wt %;
- using the raw material mixture to form a heat sealable layer;
- and
- disposing a base layer onto the heat sealable layer so as to obtain the heat sealable polyester film;
- wherein the base layer includes a main component of regenerated polyethylene terephthalate with a first melting temperature;
- wherein a heat sealing temperature of the heat sealable polyester film is lower than the first melting temperature in a range from 120° C. to 230° C.
Dependencies are inferred from the claim text.