Patent GB-834350-A (GB)
Title: Improvements in or relating to polyamide and polyester extrusion materials
IPC: C08J3/22
Filed: 1957-10-14
Abstract: Particulate polamides or polyesters are rolled with a molten paraffin wax having a melting point of at least 30 DEG  C. and a powdered material to produce coated particles.  The particles may be chips, flakes or granules.  Specified powdered materials are pigments and thickening agents, e.g. titanium dioxide, carbon black, tributyl, dibutyl, diethyl and triphenyl phosphite, diethyl - b  - chloroethyl, phenyl - bis - p - chlorophenyl, trichloroethyl, trichloropropyl, ethyl-bis-b -chloroethyl and bis-b -chlorethyl vinyl phosphate, bis-chloromethylene-m-xylene, polyallyl chloride, tetraethyl pyrophosphate, bis-(chloroethyl)-sulphate, tri-n-butyl borate, p-xylylene dichloride, glycerol trichloroacetate, bis-bromomethyl - m - xylene, p - bis(epoxypropoxy)-benzene, "Reoplex" (Registered Trade Mark), 2:4-dimethyl phenol, 2:4-dimethylol-6-chlorophenol and terephthalic dialdehyde.  The particles may be rolled simultaneously with the wax and the powdered material or the particles may be rolled with the wax which is allowed to solidify before rolling with the powdered materials.  In the Examples: (1) grains of poly-e -caprolactam are rolled at 100 DEG  C. with a paraffin wax having a melting point of 85 DEG  C. and then with titanium dioxide, (2) polyhexamethylene adipamide grains particles are rolled at 80 DEG  C. with a paraffin wax having a melting point of 60 DEG  C. and then with carbon black, (3) polyethylene terephthalate grains are rolled at 100 DEG  C. with a paraffin wax having a melting point of 85 DEG C. and then with titanium dioxide, (4) poly-e -caprolactam grains are rolled at 100 DEG  C. with a paraffin wax having a melting point of 85 DEG  C. and then with tributyl phosphite and titanium dioxide. The examples describe the extrusion moulding of the coated particles into various shaped objects.ALSO:A method of making extrusion material from a polyamide or polyester, divided into small particles, and a powdered material to be mixed therewith during extrusion comprises rolling the particles with a molten paraffin wax having a melting-point of at least 30 DEG  C. and with the powdered material. The particles may be granules, chips or flakes.  Specified powdered materials are pigments and thickening agents, e.g. titanium dioxide, carbon black, tributyl, dibutyl, diethyl and triphenyl phosphite, diethyl-b -chloroethyl, phenyl-bis-p-chlorophenyl, trichloroethyl, trichloropropyl, ethyl - bis - b  - chloroethyl, and bis-b -chlorethyl vinyl phosphates, bis - chloromethylene - m - xylene, polyallyl chloride, tetraethyl pyrophosphate, bis-(chloroethyl) sulphate, tri-n-butyl borate, p-xylylene dichloride, glycerol trichloracetate, bis - bromomethylene - m - xylene, p - bis - (epoxypropoxy) - benzene, "Reoplex" (Registered Trade Mark), 2 : 4-dimethylphenol, 2 : 4-dimethylol-6-chlorophenol and terephthalic dialdehyde.  The particles may be rolled simultaneously with the wax and the powdered material or the particles may be rolled with the wax which is allowed to solidify before rolling with the powdered material.  In the examples: (1) grains of a polyamide made by condensing e -caprolactam in the presence of 0.1% by weight of phosphoric acid are rolled at 100 DEG  C. with a paraffin wax having a melting-point of 85 DEG  C. and then with titanium dioxide, the coated particles being extruded into a ribbon, (2) polyhexamethylene adipamide groups are rolled at 80 DEG  C. with a paraffin wax having a melting-point of 60 DEG  C. and then with carbon black, the coated particles being extruded into a filament, (3) polyethylene terephthalate grains are rolled at 100 DEG  C. with a paraffin wax having a melting-point of 85 DEG  C. and then with titanium dioxide, the coated particles being extruded into a ribbon; (4) the polyamide of Example (1) in the form of grains is rolled at 100 DEG  C. with a paraffin wax having a melting-point of 85 DEG  C. and with tributylphosphite and titanium dioxide, the coated particles being extruded into a tube.