Magnetic recording media prepared from polyurethane copolymers f

Details Magnetic recording media prepared from polyurethane copolymers f Magnetic recording media prepared from polyurethane copolymers f

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.

REFERENCES:
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patent: 5071578 (1991-12-01), Ohkubo et al.
Chemical Abstract No. 90-041398106 of Japanese Patent No. 01319122.
Chemical Abstract of Japanese Patent No. 01282726.
Otsu et al., "Living Radical Polymerizations in Homogeneous Solution by Using Organic Sulfides as Photoiniferters", Polymer Bulletin, 7, 45-50 (1982).
Otsu et al., "Living Mono-and Biradical Polymerizations in Homogeneous System Synthesis of AB and ABA Type Block Coplymers", Polymer Bulletin, 11, 135-142 (1984).
Otsu et al., Makromol. Chemie 27, 142-8 (1958).
Otsu et al., Makromol. Chemie, Rapid Communications 3, 127-132 (1982).
Chujo et al., Polymer Bulletin, 8, 239 (1982).
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