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AssigneeAlliedSignal Inc.
InventorsCharles Jay Nelson, Jayendra Hiralal Bheda, Peter Bryan Rim, James Michael Turner
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Polyethylene terephthalate yarn is prepared by spinning under high stress conditions in the transition region between oriented-amorphous and oriented-crystalline undrawn yarns by selection of process parameters to form an undrawn yarn that is a crystalline, partially oriented yarn with a crystallinity of 3 to 15 percent and a melting point elevation of 2 to 10° C. The spun yarn is then hot drawn to a total draw ratio between 1.5/1 and 2.5/1 with the resulting properties: (A) a terminal modulus of at least 20 g/d, (B) a dimensional stability defined by E4.5+FS<13.5 percent, (C) a tenacity of at least 7 grams per denier, (D) a melting point elevation of 9 to 14° C., and (E) an amorphous orientation function of less than 0.75. The resulting treated tire cord provides high tenacity in combination with improved dimensional stability.
A process for production of a drawn polyethylene terephthalate yarn which translates to a high tenacity dimensionally stable tire cord, comprising:
A drawn polyethylene terephthalate multifilament yarn having the following combination of properties:
A drawn polyethylene terephthalate yarn which, when twisted into an 8×8 twists per inch 1000 denier 3-end greige cord and tensilized by the sequence of dipping into a first blocked diisocyanate dipping solution, stretching at 440° F. (227° C.) for 40 seconds, dipping into a second resourcinol-formaldehyde-latex dipping solution, and relaxing at 440° F. (227° C.) for 60 seconds, provides the following treated cord property combinations:
Dependencies are inferred from the claim text.