Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, that include such thioethers. The thioethers can be the reaction product of (a) an alpha, omega dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide.

Thioethers, methods for their preparation, and compositions including such thioethers

A process is provided for the manufacture of liquid polysulfide polymers. In particular, the process allows for making the liquid form of the polysulfide polymer directly and eliminates the need to first make a solid polysulfide polymer and then convert it to a liquid.

Preparation of polysulfide compositions

PROBLEM TO BE SOLVED: To provide a method for producing a dithiol compound in a high yield, industrially inexpensively and simply without using a large scale apparatus. SOLUTION: This method for producing the dithiol compound is provided by reacting a dihalogen compound expressed by general formula (1): X-CH 2 -Y-CH 2 -X [wherein, X is a halogen atom; Y is a hetero atom and/or a hydrocarbon group without participating in the reaction, and a hetero atom or a ring structure may be contained in the hydrocarbon group], with a hydrosulfide expressed by general formula (2): MSH [wherein, M is an alkali metal atom] in the presence of a phase transfer catalyst. COPYRIGHT: (C)2008,JPO&INPIT

Method for producing dithiol compound

PROBLEM TO BE SOLVED: To provide thioethers, methods for preparing the same, and compositions including such thioethers.SOLUTION: Disclosed are thioethers, methods for preparing such thioethers, and curable compositions, such as coating and sealant compositions, which include such thioethers. The thioethers can be the reaction product of (a) an α, ω dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide. Furthermore, the present invention is directed to thioethers that are the reaction product of reactants comprising: (a) an α, ω dihalo organic compound, (b) a metal hydrosulfide, and (c) a metal hydroxide.

Thioethers, methods for preparing the same, and composition including thioethers

PROBLEM TO BE SOLVED: To provide an epoxy resin-based curable composition which has low viscosity, has sufficient flexibility, and has a high achievement degree of the hardness at initial hardening relative to the final hardness, and to provide a method for producing a liquid polysulfide polymer used in the sameSOLUTION: A method for producing a curable composition includes: reacting bis(2-chloroethyl)formal, 1,2,3-trihalopropane and sodium polysulfide in the presence of a phase-transfer catalyst to produce a liquid polysulfide polymer containing 8 wt% or more of thiol groups in one molecule without forming solid polysulfide; and mixing the obtained liquid polysulfide polymer with an epoxy resin and amines to produce a curable compositionSELECTED DRAWING: None

Liquid polysulfide polymer and method for producing curable composition

PURPOSE: To increase intrinsic viscosity, decrease reaction time, and improve mechanical strengths by conducting the polycondensation of an alkali metal sulfide with a dihalide compd. in the presence of a specific quaternary ammonium salt. CONSTITUTION: An alkali metal sulfide (e.g. sodium sulfide nona-hydrate) and a dihalide compd. of formula I (wherein R 5 and R 6 are each H or a hydrocarbon group; and R 7 is a direct bond or a hydrocarbon group) (e.g. 1,6-dibromohexane) are polycondensed in the presence of a phase transfer catalyst comprising a quaternary ammonium salt of formula II (wherein R 1 to R 4 are each an aliph. alkyl group provided that at least two of them are 6C or higher alkyl) (e.g. trioctylmethylammonium chloride) in a solvent at 50-150°C. COPYRIGHT: (C)1992,JPO&Japio

Tadanori Fukuda

Papers

Preparation of polysulfide