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US 9,656,418 B2Granted
Co-polyester packaging resins prepared without solid-state polymerization, a method for processing the co-polyester resins with reduced viscosity change and containers and other articles prepared by the process
AssigneeDak Americas LLC
InventorsPeter S. Kezios, Helen Codd, Kevin Richard Harrison
Life of this patent
Estimating the term…
Abstract
A method of processing a polyester composition without changing the intrinsic viscosity of the polyester polymer by more than 0.025 dL/g such as injection molding a PET resin to form a bottle perform and blow molding a container from the bottle preform.
Claims37
A process for making a shaped article from a solid polyester resin containing a polyester polymer, comprising:
- forming the shaped article by melting and processing pellets of the polyester polymer without changing the intrinsic viscosity of the polyester polymer by more than 0.025 dL/g;
- wherein the polyester polymer before the melting has an intrinsic viscosity of from 0.70 to 0.95, and
- wherein the pellets of the polyester resin are:
- (i) made without solid-state polymerization, (ii) made with high IV melt polycondensation, and (iii) made by direct latent heat crystallization in which an extruded stream of the molten polyester polymer is quenched in a water bath containing water having a temperature of 80° C. or higher.
1 more element
A process for forming a molded article from a polyester resin containing a polyester polymer, comprising;
- forming the molded article by melting and processing pellets of the polyester resin without drying or partially drying the polyester resin before the melting and the processing;
- wherein the polyester polymer has an intrinsic viscosity of from 0.7 to 0.95 dL/g before the melting and the intrinsic viscosity of the polyester polymer after the melting and the processing has decreased by no more than 0.05 dL/g, and
- wherein the pellets of the polyester resin are:
- (i) made without solid-state polymerization, (ii) made with high IV melt polycondensation, and (iii) made by direct latent crystallization in which an extruded stream of the molten polyester polymer is quenched in a water bath containing water having a temperature of 80° C. or higher.
1 more element
A process for forming a molded article from a solid polyester resin containing a polyester polymer, comprising;
- forming the molded article by melting and processing a composition comprising pellets of the polyester resin and one or more additives,
- wherein the polyester polymer has an intrinsic viscosity of from 0.7 to 0.95 dL/g before the melting and the processing and the intrinsic viscosity of the polyester polymer decreases by no more than 0.05 dL/g after the molding and the processing, and
- wherein the pellets of the polyester resin are:
- (i) made without solid-state polymerization, (ii) made with high IV melt polycondensation, and (iii) made by latent crystallization in which an extruded stream of the molten polyester polymer is quenched in a water bath containing water having a temperature of 80° C. or higher.
1 more element
Dependencies are inferred from the claim text.