Abstract: A polyacetal resin composition comprises polyacetal and a two- or more-stage polyacrylate comprising a rubber like first stage and a thermoplastic rigid final stage. It is useful for a metallized article with a high impact resistance.

Abstract: A polyester composition comprises (1) a polyester being incapable of further substantial propagation of the chains by heating, being capable of forming the anisotropic phase in the molten state, being capable of the melt-processing and (2) an epoxy compound and is improved in heat resistance.

Abstract: After crude polyacetal polymers mainly comprising bonded oxymethylene groups in the main chain thereof were once molten, they are heated at temperatures of 80.degree. C. or above in liquid mediums, in which said crude polyacetal polymers are insoluble, with keeping a heterogeneous system after they were once molten.

Abstract: A polyacetal composition which comprises polyacetal, an aliphatic ester of a polyhydric alcohol having a hydroxy group, polyethylene glycol, and an organometallic salt, wherein the organometallic salt is present in an amount of from 0.01 to 5 percent by weight based on the total composition.

Abstract: Polyacetal resin composition containing electrically conductive carbon black is improved in respect to stability to heat by incorporating thereinto an amide compound.

Abstract: A trioxane copolymer is manufactured by adding to trioxane and a co-monomer, 0.0001 to 2.0 percent by weight, based on the total weight of the monomers, of one or more sterically hindered phenols, then co-polymerizing the resultant mixture in the presence of a cation-active catalyst, and then treating the resultant copolymer by heating it at a temperature which is higher than the melting point of the copolymer to melt the copolymer and decompose and remove unstable parts of the copolymer.

Abstract: A crude polyacetal polymer obtained by polymerization or copolymerization and having as a principal component thereof connected oxymethylene radicals in a main chain is treated in a non-soluble liquid medium at temperatures higher than 80.degree. C. but lower than the melting point of the polymer and at heterogeneous equilibrium, moving the crude polymer and the non-soluble medium in opposite directions relative to each other.

Abstract: A thermoplastic resin composition comprises a crystalline thermoplastic resin, a reinforcing fiber, a flaky filler and polycarbonate and is suitable for molding.

Abstract: Polytetramethylene terephthalate is manufactured from terephthalic acid and 1,4-butanediol in two stages, a first stage comprising an esterification reaction employing an esterification catalyst and a second stage comprising a condensation-polymerization reaction. The esterification reaction is carried out in the presence of at least one acid amide compound, preferably selected from urea, a derivative thereof, mono- or poly-carboxylic acid amides having 1 to 9 carbon atoms, polyamides, phosphoric acid amides and sulfonic acid amides, whereby the production of tetrahydrofuran as a by-product is appreciably inhibited and the time required for the esterification reaction is reduced.

Abstract: A bag for cultivating mushrooms constructed at least in part from a microporous film which has gas-permeability but does not pass bacteria and infectious microbes.