Polyurethane coatings for magnetic recording structures and prod

Details Polyurethane coatings for magnetic recording structures and prod Polyurethane coatings for magnetic recording structures and prod

1985-07-12

1986-05-20

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

430284, 430296, 528 85, 558266, C08F 2602, C08F12602, C08F22602

Patent

active

045902500

ABSTRACT:
Radiation curable coating compositions, and especially electron beam-curable coating compositions, are disclosed in which magnetizable particles are dispersed in a liquid vehicle comprising an hydroxy functional polyethylenically unsaturated polyurethane having the following structural formula: ##STR1## in which X is an ethylenically unsaturated monomer initially carrying a single hydroxy group, R' is the residue of an at least trifunctional polyol or amino alcohol linking compound, s is a number of 0.8 to 10, t is a number from 1 to 15, and Z is a diisocyanate terminated polycarbonate diol polyurethane oligomer having the following structure: ##STR2## in which R is alkylene having from 1-20 carbon atoms, Q is the residue of an organic diisocyanate; y is at least 1, and R and y are selected to provide a molecular weight for the polycarbonate diol reactant of from 300 to 3000.

REFERENCES:
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patent: 4250322 (1981-02-01), Effimov et al.
patent: 4264752 (1981-04-01), Watson, Jr.
patent: 4267120 (1981-05-01), Euscurida et al.
patent: 4357414 (1982-11-01), Hartmann et al.
patent: 4423179 (1983-12-01), Suargliardo
patent: 4456745 (1984-06-01), Rajan
patent: 4463141 (1984-07-01), Robinson

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