Polyester compositions for molding clear parts
AssigneeEastman Chemical Company
InventorsAlisa Annette Williams, Mark Allan Treece, Ludovic Claude Robert Gardet, Gary Michael Stack
Life of this patent
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Abstract
This invention relates to certain poly(1,4-cyclohexylenedimethylene terephthalate) copolyesters which are useful for the preparation of clear and tough thick wall molded parts, produced at good cycle times. The copolyesters can be molded into desired shapes such as cosmetic jars, fragrance caps, tool handles, and toothbrushes. These molded articles can have thick or thin walls and may be molded in a two shot molding process. The copolyesters also have good flow and reduced cycle times.
Claims17
A molded article comprising a copolyester having an acid component and a glycol component and an inherent viscosity of from about 0.5 to about 0.8 dL/g,
- wherein the acid component comprises repeat units from 40 to 60 mole % terephthalic acid and from 40 to 60 mole % of one or more dibasic acids selected from the group consisting of isophthalic acid, cyclohexanedicarboxylic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, and stilbenedicarboxylic acid;
- the glycol component comprises repeat units from 1,4-cyclohexanedimethanol;
- the total mole % of the acid component is 100 mole % and the total mole % of the glycol component is 100 mole %;
- the molded article is visually clear;
- and
- the molded article has a thickness of from 8 to 90 mm.
A molded article comprising a copolyester having an acid component and a glycol component and an inherent viscosity of from about 0.5 to about 0.8 dL/g,
- wherein the acid component comprises repeat units from 40 to 60 mole % terephthalic acid and from 40 to 60 mole % of one or more dibasic acids selected from the group consisting of isophthalic acid, cyclohexanedicarboxylic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, and stilbenedicarboxylic acid;
- the glycol component comprises repeat units from 1,4-cyclohexanedimethanol;
- the total mole % of the acid component is 100 mole % and the total mole % of the glycol component is 100 mole %;
- the molded article is visually clear;
- and
- the molded article has a crystallization haze half-time of greater than 40 minutes.
Dependencies are inferred from the claim text.