Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1990-06-25
1992-06-02
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Composite
Of polyamidoester
428694, 428900, 252 6254, G11B 500
Patent
active
051185806
ABSTRACT:
The present invention relates to an inferter compound of the formula I(T).sub.n wherein I represents the free radical initiator portion of the iniferter compound and wherein I comprises a hydroxy-functional polyurethane polymer which comprises: (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(.).sub.n. The invention also relates to an iniferter which further comprises at least one SO.sub.3 M 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.
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Cashion Jr. Merrell C.
Dowdall Janice L.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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