Polyester Composition And Method For Preparing Articles By Extrusion Blow Molding
First Claim
1. A polyester composition suitable for extrusion blow molding comprising a first polyester copolymer which does not show a peak crystallization time of less than about 45 minutes, a second polyester having a peak crystallization time of less than 45 minutes, and from about 0.1 to about 5 wt % of a chain extender, wherein the first polyester copolymer and the second polyester have a weight ratio of from about 10:
- 90 to about 90;
10.
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Accused Products
Abstract
Polyester compositions described herein have properties which are particularly suitable for extrusion blow molding (EBM). These properties relate primarily to the rate of crystallization and melt strength or melt viscosity. Articles prepared from the polyester compositions exhibit good clarity, aesthetics, and other physical properties. The polyester compositions also exhibit broad molecular weight distribution (MWD), resulting in improved processability and melt strength. The crystallization rate allows for good drying characteristics while also enabling the use of regrind. In addition, the compositions exhibit improved recyclability, such as in existing PET recycling streams. In one aspect, articles are prepared in an extrusion blow molding method by combining a dry first polyester copolymer component, a dry second polyester component, and a chain extender to form a feed material suitable for extrusion blow molding. In another aspect, a single component co-polyester and a chain extender are combined to form a feed material.
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Citations
65 Claims
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1. A polyester composition suitable for extrusion blow molding comprising a first polyester copolymer which does not show a peak crystallization time of less than about 45 minutes, a second polyester having a peak crystallization time of less than 45 minutes, and from about 0.1 to about 5 wt % of a chain extender, wherein the first polyester copolymer and the second polyester have a weight ratio of from about 10:
- 90 to about 90;
10. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 90 to about 90;
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13. A process of extrusion blow molding an article comprising:
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combining a dry first polyester copolymer component, a dry second polyester component, and a chain extender to form a feed material suitable for extrusion blow molding; and feeding the feed material to an extrusion blow molding machine to form an extruded article. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A process of extrusion blow molding an article comprising:
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combining a single component co-polyester and a chain extender to form a feed material suitable for extrusion blow molding; and feeding the feed material to an extrusion blow molding machine to form an extruded article. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A process of recycling a polyester extrusion blow molded container in a PET recycling stream comprising:
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granulating a polyester extrusion blow molded container to form a recycle feed material of particles or flake; washing the recycle feed material; drying the recycle feed material; and further processing the recycle feed material into a form suitable for preparing finished articles. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification