Abrasive filaments and production process thereof

DETAILED DESCRIPTION An object of this invention is to provide abrasive filaments made of a synthetic resin, which contains abrasive grains, and having excellent abrasiveness and high durability.
Another object of this invention is to provide from a polyvinylidene fluoride resin abrasive filaments balanced highly in toughness, flexing fatigue resistance, warm water resistance, chemical resistance, formability and processability and also to provide a process for their production.
The present inventors have carried out an extensive investigation with a view toward providing solutions to the aforementioned problems of the prior art.
As a result, it has been found that the above objects can be attained by mixing abrasive grains with a polyvinylidene fluoride resin having an inherent viscosity (.
eta.
.
sub.
inh) in a specific range and then melt-spinning the resultant mixture, leading to completion of this invention.
In one aspect of this invention, there is thus provided abrasive filaments made of a composition which comprises 95-70 vol.
% of a polyvinylidene fluoride resin, whose inherent viscosity (.
eta.
.
sub.
inh) ranges from 0.
9 to 1.
4, and 5-30 vol.
% of abrasive grains.
In another aspect of this invention, there is also provided a process for the production of abrasive filaments, which comprises: melt-spinning a composition of 95-70 vol.
% of a polyvinylidene fluoride resin, whose inherent viscosity (.
theta.
.
sub.
inh) ranges from 0.
9 to 1.
4, and 5-30 vol.
% of abrasive grains; and stretching the resultant filaments at a draw ratio of 2.
5 times-5.
5 times within a temperature range of 100.
degree.
-200.
degree.
C.