Abrasive disc of polyurethane bonded metallic wool

Claim 1

An abrasive tool for removing a predetermined coating from an aluminum surface without damage thereto, consisting of: an abrasive matrix of metallic wool having a hardness that is slightly less than the aluminum surface from which said predetermined coating is to be removed but greater than that of said predetermined coating to be removed; a room temperature cured elastomeric polyurethane, two component ether type polyol binder mixed uniformly with said abrasive mixture of metallic wool; said abrasive matrix of metallic wool and the aforesaid room temperature cured elastomeric polyurethane, two component ether type polyol binder being uniformly mixed in proportions of fifty-five percent and forty-five percent by weight, respectively; and a predetermined amine catalyst mixed with said room temperature cured elastomeric polyurethane, two component ether type polyol binder in such manner as to expeditiously effect the setting thereof after said room temperature cured elastomeric polyurethane, two component ether type polyol binder has been mixed with the aforesaid abrasive matrix of metallic wool and in such manner as to effect a predetermined solid disc thereof upon the setting thereof.

Claim 9

A method of making a soft abrasive tool, consisting of the steps: placing a predetermined quantity of metal wool in the bottom of a mold having a predetermined geometrical configuration; compressing said metal wool in the bottom of said mold with a pressure of the order of three thousand pounds per square inch gauge; bringing an elastomeric polyurethane binder material to a room temperature of the order of 75° F.; mixing said elastomeric polyurethane binding material with a predetermined setting effecting amine catalyst; pouring a predetermined quantity of said elastomeric polyurethane binder material and catalyst mixture into the mold containing the aforesaid metal wool and on said metal wool in such manner that the proportions thereof are forty-five percent binder material and fifty-five percent metal wool by weight; compressing said elastomeric polyurethane binder material and catalyst mixture with a pressure of the order of three hundred pounds per square inch gauge, so as to effect the uniform impregnation of said metal wool thereby in such manner as to form a uniform mixture thereof; curing said elastomeric polyurethane binder material and metal wool mixture at room temperature until a predetermined hardness is obtained therein; and removing said cured elastomeric polyurethane binder material and metal wool mixture from the aforesaid mold.

Claim 10

A method of making a soft abrasive tool, consisting of the steps: placing a predetermined quantity of metal wool in the bottom of a mold having a predetermined geometrical configuration; compressing said metal wool in the bottom of said mold with a pressure of the order of three thousand pounds per square inch gauge; bringing an elastomeric polyurethane binder material to a room temperature of the order of 75° F.; mixing said elastomeric polyurethane binding material with a predetermined setting effecting amine catalyst; pouring a predetermined quantity of said elastomeric polyurethane binder material and catalyst mixture into the mold containing the aforesaid metal wool and on said metal wool in such manner that the proportions thereof are forty-five percent binder material and fifty-five percent metal wool by weight; compressing said elastomeric polyurethane binder material and catalyst mixture with a pressure of the order of three hundred pounds per square inch gauge, so as to effect the uniform impregnation of said metal wool thereby in such manner as to form a uniform mixture thereof; curing said elastomeric polyurethane binder material and metal wool mixture at room temperature until a predetermined hardness is obtained therein; and removing said cured elastomeric polyurethane binder material and metal wool mixture from the aforesaid mold.