The present invention relates to a method of preparing a polyphenylene sulfide and a high-viscosity polyphenylene sulfide prepared using the method. In this method, the ratio of an organic phase to an aqueous phase is controlled by controlling dehydration conditions, so that high viscosity may be realized without adversely affecting a reaction or physical properties during preparation of the polyphenylene sulfide.

The invention provides a polymer comprising two or more residues of formula III or IV or salts thereof: wherein dash line, X, Y, Q, L, M, n, R.sup.1, R.sup.2, R.sup.a, R.sup.b, R.sup.c and R.sup.d have any of the values defined in the specification, as well as synthetic intermediates and synthetic methods useful for preparing the compounds. The polymer is useful to treat contaminated water by chelating metal. ##STR00001##

The invention provides a polymer comprising two or more residues of formula III or IV or salts thereof: wherein dash line, X, Y, Q, L, M, n, R.sup.1, R.sup.2, R.sup.a, R.sup.b, R.sup.c and R.sup.d have any of the values defined in the specification, as well as synthetic intermediates and synthetic methods useful for preparing the compounds. The polymer is useful to treat contaminated water by chelating metal. ##STR00001##

Disclosed is a production method comprising a step of obtaining a poly(arylene sulfonium salt) comprising a terminal group including at least one functional group selected from the group consisting of a carboxy group, a hydroxy group and an amino group, and a step of dealkylating or dearylating the poly(arylene sulfonium salt) to obtain a polyarylene sulfide resin, and a polyarylene sulfide resin comprising a terminal group including a functional group obtainable by the production method.

Disclosed is a production method comprising a step of obtaining a poly(arylene sulfonium salt) comprising a terminal group including at least one functional group selected from the group consisting of a carboxy group, a hydroxy group and an amino group, and a step of dealkylating or dearylating the poly(arylene sulfonium salt) to obtain a polyarylene sulfide resin, and a polyarylene sulfide resin comprising a terminal group including a functional group obtainable by the production method.

A method of producing a polyarylene sulfide (PAS) includes a preparation step of preparing a charged mixture containing an organic amide solvent, a sulfur source, water, and a dihalo aromatic compound; a first-stage polymerization step of performing a polymerization reaction on the charged mixture at a temperature of from 170 to 280 C. to produce a prepolymer having a conversion ratio of the dihalo aromatic compound of 50% or greater; and a second-stage polymerization step of continuing the polymerization reaction in a phase-separated state at a temperature of from 245 to 290 C. in a reaction system containing the prepolymer, and includes adding a polyfunctional compound to the reaction system in the phase-separated state. A PAS having a melt viscosity (310 C., shear rate: 1216 sec.sup.1) of from 0.1 to 8000 Pa.Math.s is produced by the method.

A method of producing a polyarylene sulfide (PAS) includes a preparation step of preparing a charged mixture containing an organic amide solvent, a sulfur source, water, and a dihalo aromatic compound; a first-stage polymerization step of performing a polymerization reaction on the charged mixture at a temperature of from 170 to 280 C. to produce a prepolymer having a conversion ratio of the dihalo aromatic compound of 50% or greater; and a second-stage polymerization step of continuing the polymerization reaction in a phase-separated state at a temperature of from 245 to 290 C. in a reaction system containing the prepolymer, and includes adding a polyfunctional compound to the reaction system in the phase-separated state. A PAS having a melt viscosity (310 C., shear rate: 1216 sec.sup.1) of from 0.1 to 8000 Pa.Math.s is produced by the method.

A composition suitable for 3-D printing comprises, in one embodiment, a photopolymer including one or more thiol monomer, one or more alkene monomer, and a polymerization initiator. In another embodiment, the thiol monomer is selected from the group consisting of: glycol di(3-mercaptopropionate) [GDMP]; trimethylolpropane tris(3-mercaptopropionate) [TMPMP]; pentaerythritol tetrakis(3-mercaptopropionate) [PETMP] and 3,6-dioxa-1,8-octanedithiol [DODT]. In yet another embodiment, the alkene monomer comprises: an allyl-functional urethane/urea monomer synthesized from: an isocyanate moiety and a hydroxyl or amine functional allyl moiety. In still another embodiment, the hydroxyl or amine functional allyl moiety comprises 2-allyloxyethanol, allyl alcohol, and allylamine. In still yet another embodiment, the isocyanate moiety is selected from the group consisting of: isophorone diisocyanate (IDI), hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), 1,3-bis(isocyanatomethyl)cyclohexane, and dicyclohexylmethane 4,4-Diisocyanate (HMDI).

Controlled release polyurea microcapsules can be prepared from a combination of polyisocyanates using emulsion polymerization. Encapsulated catalysts prepared using the polyurea microcapsules can be used to control the cure rate of coatings and sealants.

Controlled release polyurea microcapsules can be prepared from a combination of polyisocyanates using emulsion polymerization. Encapsulated catalysts prepared using the polyurea microcapsules can be used to control the cure rate of coatings and sealants.