Abstract: A higher aliphatic polyamide is obtained by a method wherein particles of powdered or granular 11-aminoundecanoic acid and/or 12-aminododecanoic acid are enveloped in an inert gas, melted, and then immediately polycondensed by heating.This method is realized by an apparatus including a melting device for melting the powder or granules and a tubular polycondensation reactor connected to the melting device. The melting device is constituted by a container having an inlet and an outlet for supplying and discharging the powder or granules, respectively, a piston provided vertically in the container, and a melting chamber provided below the piston and incorporating therein a lattice-shaped hotplate.

Abstract: A process for producing flame retardant polyamide molding resin containing melamine cyanurate which is formed from melamine and cyanuric acid in the molten polyamide and which has a fine crystallite size of less than 250 A. The polyamide molding resin produced by this process provides shaped articles having excellent mechanical properties as well as flame retardant properties without blooming.

Abstract: A flame retardant polyamide molding resin containing melamine cyanurate is formed from melamine and cyanuric acid in the molten polyamide and has a fine crystallite size of less than 250 A. The polyamide molding resin provides shaped articles having excellent mechanical properties as well as flame retarding properties without blooming.

Abstract: An electric shaver having a trimmer wherein a base plate member is provided as fixed to shaver body between shaving and trimming elements and their driving power source allowing driving end of the source to pass therethrough. Stationary trimmer blade is fixed to the base plate member while slidably holding movable trimmer blade between them. Driving member coupled to the driving source end for reciprocally driving the movable trimmer blade and inner shaving blade assembly is supported on the base plate member slidably as thereby guided.

Abstract: Flame-retarding polyamide composition having excellent mechanical and flame retardant properties is disclosed. The composition comprises polyamide, about 3 to 40% by weight of melamine on the basis of the polyamide, and about 0.5 to 20% by weight on the basis of the polyamide and about 2 to 75% by weight on the basis of melamine of a compound represented by a compound selected from the group consisting of the following formulas (I) and (II) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different radicals selected from the group consisting of hydrogen, alkyl, alicyclic and aromatic radicals having from 1 to 10 carbon atoms, and from such radicals having a substituent selected from the group consisting of --OH, --COOR' and --CONH.sub.2, wherein R' is aliphatic alkyl group having from 1 to 5 carbon atoms.