DIMENSIONALLY STABLE POLYESTER YARN FOR HIGH TENACITY TREATED CORDS

World Intellectual Property Organization Patent

APP PUB NO WO-1990000638-A1
SERIAL NO

PCTUS8902781

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
ALLIED SIGNAL INCUSMORRISTOWN NJ

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Inventor(s)

Inventor Name Address
NELSON CHARLES JAY CHESTERFIELD VA 23236
BHEDA JAYENDRA HIRALAL BARTLESVILLE OKLAHOMA 74005
RIM PETER BRYAN MIDLOTHIAN VA 23113
TURNER JAMES MICHAEL CARY NC 27511

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