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US 5,686,013 AGranted
Crosslinking agent composition comprising a diisocyanate, a diidocyanate adduct, and a triisocyanate adduct
AssigneeImation Corp.
InventorNorman E. Rustad
Life of this patent
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Abstract
A magnetic recording medium, comprising a magnetic coating provided on a nonmagnetizable substrate, wherein the magnetic coating comprises a magnetic pigment dispersed in a polymeric binder, said binder being a matrix of cured components which comprise a film-forming, unhindered, aromatic polyisocyanate crosslinking agent and a polymer component.
Claims20
A composition, comprising:
- (a) a diisocyanate of the formula
- OCN--A--NCO,
- (b) a first diisocyanate adduct of the formula ##STR17## and (c) a second diisocyanate adduct of the formula ##STR18## wherein:
- each A moiety is independently a divalent, organic linking group having a chemical structure such that each NCO group pendant from each A moiety is aromatic and unhindered;
- X is a divalent, organic linking group;
- Y is a trivalent, organic linking group;
- the crosslinking agent comprises less than about 25 weight percent of the diisocyanate;
- and
- the weight ratio of the difunctional diisocyanate adduct to the trifunctional diisocyanate adduct is in the range from about 1:20 to 20:1.
6 more elements
Dependencies are inferred from the claim text.