Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-04-18
1985-03-05
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
20415919, 523181, 525455, 525920, 528 71, C08F 254, C08F28304, C08G 1838, C08G 6368
Patent
active
045031983
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electron radiation curable resin.
BACKGROUND ART
Heretofore, various resins have been synthesized which have double bonds in the molecule and can form crosslinking of network structure through the cleavage of the double bonds on exposure to electron radiation. On the other hand, it has been found that a polyester resin having hydrophilic sulfonate groups but having no double bonds in the molecule is good in ability to disperse magnetic particles when used as a binder for a magnetic coating material for producing magnetic recording medium such as magnetic tape, but is poor in solvent resistance and mechanical strength of the coating film when applied to magnetic tape. Moreover, it has been found that a polyester-polyurethane resin having metal sulfonate groups but having no double bonds in the molecule is also good in ability to disperse magnetic particles and abrasion resistance of coating film but is not satisfactory in solvent resistance.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an electron radiation curable resin which not only has good ability to disperse magnetic particles like the conventional polyester-polyurethane resin but also forms a coating film superior in solvent resistance, abrasion resistance, and mechanical strength, when it is used as a binder for a magnetic coating material for producing magnetic recording medium, particularly magnetic tape and the like.
The electron radiation curable resin of this invention is an oligopolyester-urethane resin having urethane bonds at both terminals of a polyester moiety, or a polyester-polyurethane resin wherein the polyester moieties are chain-extended through urethane bonds. This resin has a molecular weight of about 1,000 to 50,000, and has a double bond at each terminal of the molecule and contains in the molecule about 0.2 to 30 mol% of carboxylic acid component having a metal sulfonate group based on the total carboxylic acid component. The oligopolyester-urethane resin preferably has a molecular weight of about 1,000 to 10,000, and the polyester-polyurethane resin preferably has a molecular weight of about 10,000 to 50,000.
The carboxylic acid component in the polyester resin used in this invention may include, for example, an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, orthophthalic acid, and 1,5-naphthalic acid; an aliphatic dicarboxylic acid such as succinic acid, adipic acid, azelaic acid, sebacic acid, or dodecanedicarboxylic acid; an aromatic hydroxycarboxylic acid such as p-hydroxybenzoic acid or p-(2-hydroxyethoxy)benzoic acid; a tricarboxylic acid such as trimellitic acid, trimesic acid, or a tetracarboxylic acid such as pyromellitic acid. Preferable examples among them are terephthalic acid, isophthalic acid, adipic acid, and sebacic acid.
The polyhydric alcohol which is other component of the polyester resin used in this invention may include, for example, an aliphatic diol such as ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2,2,4-trimethyl-1,3-pentanediol, or an substituted derivative thereof; an alicyclic diol such as 1,4-cyclohexane dimethanol; a polyalkylene glycol such as diethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, or polytetramethylene glycol; and an alkylene oxide adduct of an aromatic diol such as ethylene oxide adduct or propylene oxide adduct of bisphenol A, or ethylene oxide adduct or propylene oxide adduct of hydrogenated bisphenol A. The polyhydric alcohol may also include a triols or a tetraol such as trimethylol ethane, trimethylol propane, glycerin, or pentaerythritol. Each polyhydric alcohol is preferably used in combination with diols.
The dicarboxylic acid having a metal sulfonate group which is still other component of the copolyester resin used in this invention may include, for example, an aromatic dicarboxylic acid having an alkali metal sulfonate group such as 2-sodiumsulfotere
REFERENCES:
patent: 3509234 (1970-04-01), Burlant
patent: 3641199 (1972-02-01), Niedenhausen
patent: 3677920 (1972-07-01), Kai
patent: 4072770 (1978-02-01), Ting
patent: 4112017 (1978-09-01), Howard
patent: 4129641 (1978-12-01), Ferrarini
Miyai Seiichi
Nakajima Kaoru
Somezawa Masashi
Bleutge John C.
Koeckert A. H.
Sony Corporation
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