摘要:
A magnetic recording tape favorably employable for recording computer data is composed of a support, and on one side of the support, a non-magnetic layer composed of a non-magnetic powder and a binder, and a magnetic recording layer composed of a ferromagnetic powder and a binder superposed in order, and on the other side, a back-coating layer containing carbon black, in which the magnetic recording tape has a lateral thermal expansion coefficient of not more than 0.0015%/° C., a lateral humidity expansion coefficient of not more than 0.0015%/% RH, a longitudinal offset proof stress of not less than 10 N, and a longitudinal breaking strength of not less than 30 N.
摘要:
Provided is a novel lithium secondary battery including a positive electrode including a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which includes a graphite as an only or as a principal component, a separator between the positive electrode and the negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent including at least one specific cyclic compound.The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.
摘要:
A magnetic recording medium is disclosed, comprising a magnetic layer comprising a ferromagnetic powder and a binder provided on one side of a non-magnetic support and a backing layer provided on another side of said non-magnetic support, wherein said ferromagnetic powder is a ferromagnetic metal powder comprising Fe as a main component Co and containing Y in an amount of from 1 to 5 atm-% based on the total weight of Fe and Co in said ferromagnetic metal powder, and said binder comprises a polyurethane mainly comprising a diol component composed of a polyether polyol and a polyester polyol and a polyisocyanate component.
摘要:
Provided is a novel lithium secondary battery including a positive electrode including a compound capable of occluding and discharging lithium, a negative electrode composed mainly of a carbon material which includes a graphite as an only or as a principal component, a separator between the positive electrode and the negative electrode; and an electrolyte solution of an electrolyte solute dissolved in a solvent including at least one specific cyclic compound. The lithium secondary battery has a large capacity, small self-discharge rate and excellent cycle characteristics and high charge-discharge efficiency.
摘要:
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic powder and a binder, the ferromagnetic powder comprising a ferromagnetic metal powder comprising Fe and having a crystal size of from 120 to 250 .ANG. and a Co content of from 5 to 40 atm %, and the binder comprises a polyurethane comprising a diol component and a polyisocyanate component, the diol component comprising a polyetherpolyol and a polyesterpolyol.
摘要:
Disclosed is a method for coating a golf ball, wherein the coating efficiency of the paint is high and a uniform coating can be formed. According to the method, the paint is sprayed on a golf ball moving with rotation on the circumference of a circle having a diameter of 0.5 to 1.5 m from a disc charged with 60,000 to 130,000 V, which is rotating at 20,000 to 40,000 rpm and is inclined or moving in the vertical direction, or a paint is sprayed in a direction at an angle of 45.degree. or less to the horizontal direction from a disc charged with the above voltage, which is rotating at the above number of revolutions, to coat the golf ball so that a ratio of the maximum film thickness to the minimum film thickness may be 1.5 or less after one round of coating.
摘要:
A magnetic recording medium is provided comprising a non-magnetic support having thereon at least one magnetic layer comprising a ferromagnetic powder, a binder, and at least one of organic silicone compounds represented by formulae (I-1) or (I-2); ##STR1## wherein R represents a branched saturated hydrocarbon group having from 7 to 24 carbon atoms; m represents an integer of from 1 to 100; n represents an integer of from 0 to 250; and m.gtoreq.n/5.
摘要翻译:提供一种磁记录介质,包括其上具有至少一个包含铁磁粉末,粘合剂和由式(I-1)或(I-2)表示的有机硅氧烷化合物中的至少一种的至少一个磁性层的非磁性载体; (I-1)(I-2)其中R表示碳原子数为7〜24的支链饱和烃基; m表示1〜100的整数, n表示0〜250的整数, 和m> / = n / 5。
摘要:
A magnetic recording medium comprising a non-magnetic support having at least two magnetic layers formed thereon, the at least two magnetic layers being formed by providing, in sequence, a first magnetic layer containing first ferromagnetic powder and a first binder on a surface of the non-magnetic support and then providing a second magnetic layer containing a second binder and second ferromagnetic powder while the first layer is in a wet state, the first magnetic layer containing the first binder in an amount of 10 to 27 parts by weight based on 100 parts by weight of the first ferromagnetic powder, the second magnetic layer containing the second binder in an amount of 14 to 30 parts by weight based on 100 parts by weight of the second ferromagnetic powder, the amount of the first binder contained in the first magnetic layer being smaller than that of the second binder contained in the second magnetic layer with a difference therebetween being from 0.5 to 10 parts by weight, and a ratio (A/B) of a dry thickness (A) of the first magnetic layer to a dry thickness (B) of the second magnetic layer being from 0.5 to 3.2. The magnetic recording medium is excellent in electromagnetic conversion characteristics and running stability.
摘要:
A method of producing a magnetic recording medium comprises the steps of kneading and dispersing ferromagnetic powder, binder and non-ferromagnetic powder to obtain magnetic coating solutions, and applying a plurality of the magnetic coating solutions on a non-ferromagnetic substrate to form a plurality of magnetic layers on the substrate. In the kneading and dispersing step, a magnetic coating composition containing a ferromagnetic powder and a solvent of 15 to 30 wt % of the ferromagnetic powder is kneaded by a two-shaft continuous kneading and mixing machine and then dispersed by a pin type sand grinder to obtain a first magnetic solution. Another magnetic coating composition containing a ferromagnetic powder and a solvent of 30 to 50 wt % of the ferromagnetic powder is kneaded by a double-arm open kneader and then dispersed by a pin type sand grinder, and finally dispersed by a disk type sand grinder to obtain a second magnetic coating solution. In the magnetic solution applying step, the first magnetic coating solution is at first applied on said substrate and then the second magnetic coating solution is applied thereon.
摘要:
A magnetic recording medium comprising a flexible support having coated thereon a magnetic layer is disclosed. The support has a surface roughness of from 0.01 to 0.1 .mu.m, the magnetic recording medium has a percent heat shrinkage of 1% or less in the direction of maximum shrinkage thereof after standing at 110.degree. C. for 4 hours, and the magnetic layer contains a metal or alloy fine powder as a ferromagnetic powder. The magnetic recording medium has a excellent running property after repeated use and a small percent heat shrinkage.