Abstract: A method for the preparation of soluble, fusible, aminomethyl diaryl compound resins in the absence of halomethylation or halomethylated materials, which method comprises (a) refluxing a mixture of diaryl compound, an aldehyde, a saturated monocarboxylic acid, and a small amount of a strong acid catalyst to form an aldehyde-diaryl resin, (b) stripping off excess monocarboxylic acid under vacuum, and then (c) adding at least about 1 mole of a primary or secondary amine containing at least one additional nontertiary amino group per reactive group on the aldehyde-diaryl resin.

Abstract: A process for continuously producing an oxymethylene polymer by continuously polymerizing a starting monomer containing at least 50 mole% of trioxane in bulk in the presence of a catalyst, which comprises feeding the starting monomer into a first-stage polymerization reactor having a self-cleaning action to perform a first-stage polymerization reaction until the conversion reaches 40 to 70%, withdrawing the reaction mixture as a powder from the outlet of the first-stage polymerization reactor, feeding the reaction mixture into a second-stage polymerization reactor having a stirring action to perform a second-stage polymerization reaction until the conversion reaches 95 to 100%, and then withdrawing the polymerization product as a powder from the outlet of the second-stage polymerization reactor.

Abstract: A foundry binder comprising furfuryl alcohol and hexaalkoxymethylmelamine is disclosed. The binder is substantially anhydrous. In using the binder it is substantially free of formaldehyde odor in the fabrication of the binder, in the production of sand shapes, and in metal foundry pouring operations. The hexaalkoxymethylmelamine does not have to be cooked with the furfuryl alcohol as does formaldehyde in commercial furfuryl alcohol-formaldehyde binders, and yet the binder provides strengths which are comparable to the furfuryl alcohol-formaldehyde binders.

Abstract: Solid thermoplastic terpolymer of trioxane is prepared by reacting trioxane in the presence of a prepolymer having recurring units consisting essentially of about 87-99 percent by weight of units derived from at least one cyclic formal and about 13-1 percent by weight of units derived from diglycerin diformal.

Abstract: A process for producing a polyacetal polymer. The process includes reacting a polyacetal forming polymerization mixture in a polymerization reaction zone, which zone includes an elongated casing substantially following the outer boundaries of at least a pair of shafts, each of the shafts provided with a plurality of intermeshing elliptical shaped plates having flattened edges at the major axis which mesh, wiping the surface of its mating plate. The polymerization mixture is polymerized to form a polyacetal product in the form of a finely divided solid.