CARBAMATE MODIFIED SULFONATED AND NON-SULFONATED HYDROXY-FUNCTIONAL POLYURETHANE MACROINIFERTER COMPOUNDS, COPOLYMER MADE THEREWITH, AND MAGNETIC RECORDING MEDIA PREPARED THEREFROM

摘要

The present invention relates to an inferter compound of the formula I(T)n wherein I represents the free radical initiator portion of the iniferter compound and wherein I comprises a hydroxy-functional polyurethane polymer whichcomprises: (i) a polyurethane backbone; (ii) a plurality of cross-linkable hydroxy groups pendant from the polyurethane backbone, wherein the polyurethane backbone has a hydroxy equivalent weight of from about 500 to about 10,000; (iii) at least n organic groups X which can be the same or different pendant from the polyurethane backbone wherein each organic group X is also bonded to a T group; T represents the terminator portion of the iniferter; and n is an integer of at least 1; wherein T and X are organic groups selected so that the T-X bond is capable of dissociating upon being subjected to an appropriate energy source of forming a terminator free radical of the formula nT. and an initiator free radical of the formula I(.)n. The invention also relates to an iniferter which further comprises at least one SO3M group pendant from the polyurethane backbone, to vinyl/polyurethane copolymers made from the iniferters, to a method of making the copolymers, and to the use of the copolymers in magnetic recording media.