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Magnetic recording medium
| Details |
Inventors: Nakajima, Kaoru; Somezawa, Masashi; Takamizawa, Minoru; Inoue, Yoshio; Yoshioka, Hiroshi;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Robinson; Ellis P.
Assistant Examiner:
Attorney, Agent or Firm: Hill, Van Santen, Steadman & Simpson
The magnetic recording medium contains the magnetic layer comprising the magnetic or magnetizable powders or particles and the binder comprising a composition containing (A) a compound represented by formula (V): ##STR1## (wherein R is methyl or ethyl group and X is a group containing an acrylic or methacrylic double bond; i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, and l is a number in the range of approximately 3 to 100, provided that the division of l by the sum of k and l is in the range from approximately 0.2 to 1.0) and (B) a compound having at least two acrylic and/or methacrylic double bonds in the molecule thereof and having a molecular weight ranging from approximately 1,000 to 6,000 in which the molecular weight in the molecule per one double bond is in the range from approximately 80 to 3,000. The composition is cured by the irradiation of radiation so that the magnetic recording medium has an improved durability as well as physical strengths in the magnetic layer thereon. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The binder to be employed in the magnetic recording medium according to the present invention may be composed of a composition composed of a compound (A) and a compound (B).
The binder containing such composition is cured by irradiation.
The compound (A) comprises components which may be each represented by the recurring units having the following general formulas: ##STR2## (wherein R is methyl or ethyl group); ##STR3## (wherein X is a group having an acrylic or methacrylic double bond).
The number of the recurring units as represented hereinabove as Unit (I) above which may be contained in the molecule of the compound may range from approximately 200 to 800.
Likewise, the number of the recurring units as represented by Unit (II) above may be in the range from approximately 10 to 200, and the number of the recurring units as represented by Unit (III) may be in the range from approximately 3 to 100.
The polymer which is composed of the aforesaid polymer components as represented by Units (I) through (III) may contain optionally an additional unit as represented by the following recurring unit (IV): ##STR4## The number of the recurring units represented by Unit (IV) above which may be optionally added to the polymer compound may range up to approximately 200.
Accordingly, the polymer compounds to be employed for the magnetic recording media produced in accordance with the present invention may be briefly represented by the following general formula (V): ##STR5## (wherein R and X have the same meanings as represented hereinabove, i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, and l is a number in the range of approximately 3 to 100, provided that the division of l by the sum of k and l is in the range from approximately 0.
2 to 1.
0).
It is to be noted herein that the order of the above components may be arbitrarily modified or changed according to the mode of reaction
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