Process for making a tire cord using yarns containing a dip penetration regulator
AssigneeE. I. Du Pont de Nemours and Company
InventorsWalter R. Andrews, Jr., Fleming H. Day
Life of this patent
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Abstract
A polyamide yarn having on the surface of the polyamide yarn a hydrophobic organic ester dip penetration regulator having a melting point greater than 27.degree. C. and convertible by conventional means into a tire cord having low stiffness and high air permeability and a process for making polymeric tire yarns is disclosed.
Claims10
In a process for making a tire cord from synthetic polymer that includes the steps of spinning, applying a finish to, drawing and twisting a singles yarn from said polymer, then cabling the twisted singles yarn to a cord and dipping the cord in a bath containing a rubber adhesive, the improvement comprising:
- applying to the singles yarn prior to said dipping a hydrophobic organic ester dip penetration regulator having a melting point greater than 27.degree. C. selected from the group consisting of hydrogenated coconut oil, hydrogenated palm oil and pentaerythritol tetralaurate in the amount of at least 0.05 percent by weight of the singles yarn whereby penetration of said dip adhesive is substantially limited to an area near the surface of the cord whereby said cord has a stiffness of less than 40 grams and an air permeability as measured by wicking of at least 0.4 liters/30 min.
Dependencies are inferred from the claim text.