| 摘要 |
<p>A process for the improvement of the adhesion to rubber or a thermoplastic elastomer of synthetic yarns, cords or fabrics made therefrom by applying thereto an adhesive consisting of an aqueous solution or dispersion of a polyurethane with ionic groups, capped isocyanate groups and groups with a Zerewitinoff-active H atom, followed by drying the product thus treated. The polyurethane corresponds to the structure: <IMAGE> +TR <IMAGE> wherein X has the meaning of an O or S atom or of an O-, S-, N- or P-containing group with a Zerewitinoff-active H atom or to which prior to reaction with an isocyanate group a Zerewitinoff-active H atom had been attached, R1 represents the remainder of a capping agent, R2 represents an at least divalent organic group which remains after removal of isocyanate groups from a polyisocyanate, R3 represents an at least divalent organic group which remains after removal of -XH groups from an organic compound having a molecular weight of 62 to 2000, R4 represents an ionic group or a potentially ionic group which remains after removal of -XH group(s), m is a number>/=1 and</=4, n is a number>/=1 and</=4, p is a number>/=1 and</=3, q is a number>/=1 and</=3, and r is a number>/=0 and</=3. The present process is especially suitable for the treatment of aromatic polyamide yarns, cords or fabrics to be incorporated into automobile tires or V-belts.</p> |
