Polyester polymer and copolymer compositions containing metallic titanium particles
AssigneeEastman Chemical Company
InventorZhiyong Xia
Life of this patent
Estimating the term…
Abstract
Polyester compositions are disclosed that include polyester polymers or copolymers having incorporated therein metallic titanium particles that improve the reheat properties of the compositions. Processes for making such compositions are also disclosed. The titanium particles may be incorporated in the polyester by melt compounding, or may be added at any stage of the polymerization, such as during the melt-phase of the polymerization. A range of particle sizes may be used, as well as a range of particle size distributions. The polyester compositions are suitable for use in packaging made from processes in which a reheat step is desirable.
Claims20
A polyester composition having improved reheat, comprising:
- a polyester polymer;
- and
- metallic titanium particles, having a median particle size less than 1 μm, dispersed in the polyester polymer in an amount from 0.5 ppm to 50 ppm, with respect to the total weight of the polyester composition.
A polyester composition having improved reheat, comprising:
- a polyester polymer;
- and
- metallic titanium particles, having a median particle size from about 0.005 μm to about 100 μm, dispersed in the polyester polymer, wherein the metallic titanium particles comprise hollow spheres comprised of titanium.
A polyester composition having improved reheat, comprising:
- a polyester polymer in which poly(ethylene terephthalate) residues comprise at least 90 wt. % of the polyester polymer;
- and
- metallic titanium particles, having a median particle size from about 0.005 μm to less than 1 μm, randomly dispersed in the polyester polymer in an amount from about 1 to about 50 ppm, wherein the polyester composition has a reheat improvement temperature of 10° C. or more and an L* brightness level of 60 or more.
A polyester composition having improved reheat, comprising:
- a polyester polymer;
- and
- metallic titanium particles dispersed in the polyester polymer in an amount from 2 ppm to 15.4 ppm, with respect to the total weight of the polyester composition.
A polyester composition having improved reheat, comprising:
- a polyester polymer;
- and
- metallic titanium particles dispersed in the polyester polymer in an amount from 4.2 ppm to 15.4 ppm, with respect to the total weight of the polyester composition.
Dependencies are inferred from the claim text.