Hairbrush with thermochromic filaments and the method of manufacturing the same

Abstract

The present invention relates to a hairbrush with a plurality of filaments which is formulated by a mixture of thermo-sensitive color-changing powder and plastic materials, and the color of which varies with temperature, and the method of manufacturing such thermochromic filaments. The hairbrush comprises a handle, a head which has a number of pre-set filament holes on its surface and is attached to the handle by any convenient means, and a plurality of filaments which is formulated by extrusion process from plastic material of 98% to 94% by weight plus a mixture of 2% to 6% by weight comprising melamine plastics of 6%, latent dye of 4.5%, fixing agent of 10%, fatty acid of 0.5% and metallic oxide of 79% by weight and is attached to the filament holes by any convenient means.

1 . A hairbrush with a plurality of filaments which can change color with temperature, comprising: 
 a handle;    a head which has a number of pre-set filament holes on its surface and is attached to the handle by any convenient means; and    a plurality of filaments each of which is formulated in one piece by extrusion process from plastic material of 98% to 94% by weight plus a mixture of 2% to 6% by weight comprising melamine plastics of 6%, latent dye of 4.5%, fixing agent of 10%, fatty acid of 0.5% and metallic oxide of 79% by weight, and is attached to the filament holes by any convenient means.    
   
   
       2 . A method of manufacturing filaments for a hairbrush as claimed in  claim 1 , comprising the steps of: 
 preparing a thermochromic composition by feeding melamine plastics of 0.12%, latent dye of 0.09%, fixing agent of 0.2%, fatty acid of 0.01% and metallic oxide of 1.58% and plastic material of 98% by weight into an extruder of a monofilament making machine;    adding heat to melt the materials;    mixing the materials inside the extruder by spinning to form molten polymer;    using the extruder barrel to push the molten polymer out through a nozzle plate to form individual uniform wires;    submerging the wires into water for cooling to form strings of filaments;    steaming the filaments in a hot water bath;    stretching the filaments to a desired diameter;    winding the annealed filaments on a winder; and    attaching the filaments to the filament holes by any convenient means.