Hodogaya Chemical Co., Ltd.

Murata Manufacturing Co., Ltd.

Masafumi Umekawa

Masami Ito

Yoshikazu Aoki

Masateru Yasumura

Naohiro Tarumoto

Jun Watanabe

Hideyuki Otsuka

Masaki Okubo

Kunio Sodeyama

Kazunori Noguchi

Takao Mori

Kazuhiko Suzuki

Provided is a battery capable of maintaining electrical insulation between a battery lid and a battery can when exposed to an aqueous solution such as sea water. Disclosed is a secondary battery including an electrode winding body in which a strip-shaped positive electrode and a strip-shaped negative electrode are stacked with a separator interposed between the electrodes and wound, an electrolytic solution, and a battery can that houses the electrode winding body and the electrolytic solution, the battery can having an opening hermetically sealed by a safety valve mechanism and a battery lid with a gasket interposed therebetween, in which the battery lid includes a terminal portion and a flange portion, and a metal layer is included between an outer main surface of among main surfaces of the flange portion and the gasket.

Secondary battery, electronic device, and power tool

A battery includes: an electrode body; and a battery can housing the electrode body and having a bottom portion. The bottom portion has an arc-shaped groove. An opening angle of the groove with respect to a center of the bottom portion is 0.5 degrees or more and 56 degrees or less. A ratio of an inner diameter of the groove with respect to an outer diameter of the bottom portion is 44% or more and 77% or less.

Battery, battery can, battery pack, electronic device, electric vehicle, electricity storage device, and electric power system

A method for producing an oxidized cyclic phenol sulfide which comprises the step of oxidizing a cyclic phenol sulfide of the following formula (1) as a raw material: wherein R represents a straight or branched alkyl group having 1 to 6 carbon atoms, and m is an integer from 4 to 8, wherein R represents a straight or branched alkyl group having 1 to 6 carbon atoms, m is an integer from 4 to 8, and n is 1 or 2.

Methods for producing oxidized cyclic phenol sulfides

The object of the present invention is, in methods for producing cyclic phenol sulfides, to provide methods for producing a number of more macrocyclic products, which comprise the steps of producing a mixture of cyclic phenol sulfides from an inexpensive raw material in one step without inducing the reduction in yield of a cyclic quatromer; and easily separating and purifying a single component from the mixture of cyclic phenol sulfides. The present invention discloses methods for producing a cyclic phenol sulfide which comprises the step of reacting a phenol compound as a raw material, in a one-step reaction, with 1.7 to 2.5 molar equivalent of sulfur and 0.25 to 0.75 molar equivalent of an alkali metal reagent per 1 mol of the phenol compound to obtain a mixture of cyclic phenol sulfide wherein m=4 and at least one kind(s) of cyclic phenol sulfide wherein m=5 to 9, or each separate cyclic phenol sulfide comprised in the mixture.

Methods for producing cyclic phenol sulfides

A method for producing an oxidized cyclic phenol sulfide which comprises the step of oxidizing a cyclic phenol sulfide of the following formula (1) as a raw material: wherein R represents a straight or branched alkyl group having 1 to 6 carbon atoms, and m is an integer from 4 to 8,in a solvent(s) other than a halogenated hydrocarbon in an amount of 2 or more and less than 10 parts by weight per 1 part by weight of the cyclic phenol sulfide, with an oxidizing agent(s) to obtain an oxidized cyclic phenol sulfide of the following formula (2): wherein R represents a straight or branched alkyl group having 1 to 6 carbon atoms, m is an integer from 4 to 8, and n is 1 or 2.

The present invention discloses a mixed cyclic phenol sulfide which is a mixture of the cyclic phenol sulfide wherein m is 8 and the cyclic phenol sulfide wherein m is an integer other than 8, the cyclic phenol sulfide being represented by the following formula (1): wherein R is a straight or branched alkyl group having 1 to 6 carbon atoms, and m is an integer from 4 to 9; or a cyclic phenol sulfide of formula (1) wherein m is 8. The present invention also discloses a charge control agent which comprises the above sulfide(s) as the active ingredient; and a toner which comprises the charge control agent, a coloring agent and a binder resin. This charge control agent is particularly useful for color toners, and it speeds up charging risetime, and has a high charge amount and charging characteristics excellent in the environmental stability. Further, the charge control agent is safe since it does not have any problem with the waste regulations.

Mixed cyclic phenol sulfides, and charge control agents and toners using the same

The present invention discloses an oxidized mixed cyclic phenol sulfide which is a mixture of the oxidized cyclic phenol sulfide wherein m is 8 and the oxidized cyclic phenol sulfide wherein m is an integer other than 8, the oxidized cyclic phenol sulfide being represented by the following formula (1): wherein R is a straight or branched alkyl group having 1 to 6 carbon atoms, m is an integer from 4 to 9, and n is 1 or 2; or an oxidized cyclic phenol sulfide of formula (1) wherein m is 8. The present invention also discloses a charge control agent which comprises the above sulfide(s) as the active ingredient; and a toner which comprises the charge control agent, a coloring agent and a binder resin. This charge control agent is particularly useful for color toners, and it speeds up charging risetime, and has a high charge amount and charging characteristics excellent in environmental stability. Further, the charge control agent is safe since it does not have any problem with the waste regulations.

Growing community of inventors

Fukushima, Japan

Masafumi Umekawa