Abstract An improved tire and tire cord which is made by treating polyester cord reinforcement by subjecting the tire cord to a first stage of heat treatment at a temperature in excess of 440* F. and for a period of 30 to 70 seconds while stretching the cord from 2 to 10 percent of its original length, followed by a second stage of heat treatment at a temperature also in excess of 440* F., and preferably higher than the temperature of the first stage, with an exposure time of 30 to 70 seconds and with the cord being permitted to shrink by 30 to 50 percent of the amount that it was stretched in the first stage treatment. An improved tire cord results. The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawings and the following detailed description.
Linear polyester cord reinforcement for a tire, the cords of which have a thermal shrinkage of 2.5 to 5.75 percent and an elongation at 2 grams per denier of 6.5 to 9.0 percent.
Claim 2
Dependent Claim
33 words
Linear polyester cord reinforcement for a tire, the cords of which have a thermal shrinkage of 2.5 to 5.75 percent and an elongation at 2 grams per denier of 6.5 to 9.0 percent.
Claim 3
Dependent Claim
35 words
A pneumatic tire which includes linear polyester cord reinforcement, the cords of which have a thermal shrinkage of 2.5 to 5.75 percent and an elongation at 2 grams per denier of 6.5 to 9.0 percent.
Claim 4
Dependent Claim
35 words
A pneumatic tire which includes linear polyester cord reinforcement, the cords of which have a thermal shrinkage of 2.5 to 5.75 percent and an elongation at 2 grams per denier of 6.5 to 9.0 percent.