Electron beam curable urethane resin for magnetic recording medium, method of manufacturing the same and magnetic recording medium using the same

Abstract

An electron-beam curable polyurethane resin for magnetic recording media is produced by modifying a polyurethane resin having active hydrogen in the molecule thereof with a compound having at least two acrylic double bonds, wherein the modification is performed on the active hydrogen so that the polyurethane resin becomes electron-beam curable. By subjecting a known thermosetting polyurethane resin to electron-beam sensitive modification, the resulting resin is highly crosslinked and is thus capable of being suitably used for magnetic recording media. Also, an electron-beam curable polyurethane resin having excellent crosslinking characteristics can easily be produced from the known thermosetting polyurethane resin. Furthermore, by using the electron-beam curable polyurethane resin, a high-performance magnetic recording medium can be provided.

1 - 20 . (canceled)  
   
   
       21 . An electron-beam curable polyurethane resin for a magnetic recording medium comprising an isocyanurate having two acrylic double bonds.  
   
   
       22 . The electron-beam curable polyurethane resin for a magnetic recording medium of  claim 21 , wherein the isocyanurate is delivered by a trimer of isophorone diisocyanate.  
   
   
       23 . The electron-beam curable polyurethane resin for a magnetic recording medium of  claim 21 , wherein the isocyanurate is delivered by an alcohol having at least one acrylic double bond.  
   
   
       24 . A magnetic recording medium comprising the electron-beam curable polyurethane resin of  claim 21 .  
   
   
       25 . The magnetic recording medium of  claim 24 , further comprising a non-magnetic substrate provided with a layer containing the electron-beam curable polyurethane resin.