Patent ID: 11920010
Assignee: NAN YA PLASTICS CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A heat-sealable polyester film, comprising:
a base layer; and
a heat-seal layer formed on at least one side surface of the base layer, wherein the heat-seal layer is formed by a polyester composition, and the polyester composition comprises:
a physically regenerated polyester resin formed by physically regenerated polyester chips, and the physically regenerated polyester chips have a first intrinsic viscosity;
a chemically regenerated polyester resin formed by chemically regenerated polyester chips, and the chemically regenerated polyester chips have a second intrinsic viscosity less than the first intrinsic viscosity; and
a modifier dispersed in the physically regenerated polyester resin and the chemically regenerated polyester resin;
wherein the physically regenerated polyester resin, the chemically regenerated polyester resin, and the modifier are mixed according to a predetermined intrinsic viscosity, so that the heat-seal layer has the predetermined intrinsic viscosity, and the modifier is configured so that the heat-sealable temperature of the heat-sealable polyester film has a range between 100° C. and 230° C. for heat-sealing, based on a total weight of 100 wt % of the heat-seal layer, a content of the physically regenerated polyester resin is between 50 wt % and 95 wt %, and a content of the chemically regenerated polyester resin is between 1 wt % and 40 wt %.