Patent ID: 6094769
Filing Date: 2000-08-01
Classification: A46D,Y10T

Abstract:
A toothbrush bristle comprisinga plastic monofilament,said monofilament having a longitudinal axis, a non-circular cross-section transverse said longitudinal axis, an initial molecular structure having initial mechanical properties, and defining a core region and a peripheral region of the cross-section remote in a radial direction from said longitudinal axis,said monofilament being twisted about its longitudinal axis such that the peripheral region has a helically shaped surface, andsaid peripheral region being at least partially dissolved by a solvent while said core region being substantially not dissolved by said solvent, whereby said solvent-treated peripheral region has a different molecular structure than said core region and whereby said solvent-untreated core region has substantially said initial molecular structure and mechanical properties, whereby said bristle permanently retains the helically shaped surface.