Polyester fiber having excellent thermal dimensional stability, chemical stability and high tenacity and process for the production thereof

Abstract From the Canadian patent

The invention provides a polyester fiber having good thermal dimensional stability and chemical stability as well as high tenacity, which is a drawn yarn produced by melt-spinning a polyester comprising predominantly polyethylene terephthalate, solidifying the spun yarn and then drawing the yarn under specified conditions. The yarn has specific properties such as intrinsic viscosity diethylene, glycol content, carboxyl group content average birefringence, yarn tenacity and difference of average birefringence between the surface and center of the monofilament and further low, dry heat shrink and work loss when heat-treated. The polyester fiber is useful as a reinforcement for rubber goods …