Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1985-01-09
1987-06-30
Robinson, Ellis P.
Stock material or miscellaneous articles
Composite
Of polyamidoester
427128, 428694, 428900, 428328, 428329, 252 6254, G11B 5702
Patent
active
046770305
ABSTRACT:
What is claimed is a magnetic storage medium in which the polyurethane binder system forms a three-dimensional network independently of reactive low molecular weight substances present on the magnetic pigment or in the dispersion and the production of such a storage medium. The binder in the colored magnetic layer consists of a reaction product of polyisocyanates having an average functionality of from 2.1 to 4 (A) with predominantly difunctional aromatic amino-terminated polyurethanes having an average molecular weight of at least 10,000 (B) and optionally one or more hydroxyl group-containing polyesters having an OH number of from 100 to 450 (C), and/or predominantly difunctional aromatic polyamines having a molecular weight of from 100 to 400 (D) the ratio of isocyanate groups present in (A) to the isocyanate reactive groups present in (B), (C) and (D) being from 0.3:1 to 20:1, preferably from 0.8:1 to 20:1. With this binder system, it has been possible to achieve direct linkage of the polymeric binder chains and to suppress side reactions. This has enabled a soft polyurethane agent to be used, with the result of smooth dispersion of the magnetic lacquer and hence increase in the signal
oise ratio of the magnetic recording medium. The subsequent cross-linking which takes place according to the present invention enables the mechanical properties of the recording medium to be adjusted to the exact result required after the magnetic lacquer has been applied to a support.
REFERENCES:
patent: 3650828 (1972-03-01), Higashi
patent: 4328282 (1982-05-01), Lehner
patent: 4567109 (1986-01-01), Lehner
patent: 4568612 (1986-02-01), Lehner
patent: 4587170 (1986-05-01), Hanai
patent: 4634633 (1987-01-01), Ninomiya
patent: 4637959 (1987-01-01), Ninomiya
Gerum Johannes
Meckel Walter
Nippe Burkhard
AGFA -Gevaert Aktiengesellschaft
Robinson Ellis P.
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