Polyester resin closures for containers
AssigneeOrigin Materials Operating, Inc.
InventorsJay Clarke Hanan, Rachel Hess
Life of this patent
Estimating the term…
Abstract
Thermoformed polyester resin closures for closing containers, the polyester resins including polyethylene terephthalate (“PET”), polyethylene furandicarboxylate (“PEF”), or a copolymer including PET and PEF, are provided herein. Methods of making the thermoformed closures are further provided. Methods of sterilizing the thermoformed closures are further provided.
Claims43
A method of making a polyester resin closure that mounts onto a finish of a container;
- the polyester resin closure comprising:
- (a) at least one layer that comprises:
- (i) an annular wall configured to seat against a top surface of a rim of the finish;
- and
- (ii) an outer cylindrical wall extending downward from the annular wall, wherein an outer layer outer cylindrical wall comprises a plurality of knurls;
- (b) a tamper evidence feature configured to engage with a tamper evidence ledge of the finish;
- the method comprising:
- injection molding or compression molding the polyester resin into the polyester resin closure;
- and
- combining polyethylene terephthalate with an amount of furandicarboxylic acid (FDCA), diethylene glycol (DEG), or a combination thereof prior to the injection molding or the compression molding to reduce a modulus of the polyester resin and allow the polyester resin closure to be ejected from a cavity of a mold.
A method of making a polyester resin closure that mounts onto a finish of a container;
- the polyester resin closure comprising:
- (a) at least one layer that comprises:
- (i) an annular wall configured to seat against a top surface of a rim of the finish;
- and
- (ii) an outer cylindrical wall extending downward from the annular wall, wherein an outer layer outer cylindrical wall comprises a plurality of knurls;
- (b) a tamper evidence feature configured to engage with a tamper evidence ledge of the finish;
- the method comprising injection molding or compression molding polyester resin, which was synthesized while limiting a duration of solid-state polymerization, into the polyester resin closure, thereby resulting in the method being performed while limiting an intrinsic viscosity of the polyester resin.
A method of making a polyester resin closure that mounts onto a finish of a container;
- the polyester resin closure comprising:
- (c) at least one layer that comprises:
- (i) an annular wall configured to seat against a top surface of a rim of the finish;
- and
- (ii) an outer cylindrical wall extending downward from the annular wall, wherein an outer layer outer cylindrical wall comprises a plurality of knurls;
- (d) a tamper evidence feature configured to engage with a tamper evidence ledge of the finish;
- the method comprising:
- injection molding or compression molding the polyester resin into the polyester resin closure,
- wherein the method is performed while limiting an intrinsic viscosity of the polyester resin, and
- wherein the intrinsic viscosity of from 0.4 dE/g to 0.7 dL/g.
Dependencies are inferred from the claim text.