The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2018
Filed:
Apr. 20, 2017
Eastman Chemical Company, Kingsport, TN (US);
Emmett Dudley Crawford, Kingsport, TN (US);
Michael Eugene Donelson, Kingsport, TN (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
A clear, semi-crystalline, strain induced crystallized article comprising at least one polyester which comprises: (a) a dicarboxylic acid component comprising: i) 95 to 99.99 mole % of terephthalic acid residues; and ii) 0.01 to 5 mole % of isophthalic acid; and (b) a glycol component comprising: i) 4.9 to 10.2 mole % of 2,2,4,4-tetramethyl-1,3-cyclobutanediol residues; and ii) 89.8 to 95.1 mole % of 1,4-cyclohexanedimethanol residues, wherein the polyester is solid stated and has an inherent viscosity from 0.76 to 1.1 dL/g and a glass transition temperature (Tg) of 90 to 110° C. The article has strain induced crystallinity from 15% to 35% when stretched at a draw ratio of 3 to 4 times at a temperature 10° C. above the Tg or from 23.2% to 35% when stretched at a draw ratio of 3.5 to 4.5 times at a temperature 20° C. above the Tg.