in general if too little acid catalyst is employed there will be insufficient crosslinking to meet the ul specifications and the adhesive will fail on the other hand if too much is used the adhesive tends to lose tack in any event the amount of acid catalyst to be employed will be readily apparent by routine experimentation to one skilled in the art in the light of the foregoing discussion by way of illustration however from about 0 02 to about 0 06 parts by weight per 100 parts by weight of polymer has been found to be satisfactory the selection of the particular acid catalyst to be employed will also be within the expected judgment of the skilled worker acid catalysts are of course well known and understood in the art in general they may be characterized as being strong acids sulfonic acids such as p toluene sulfonic acid and methane sulfonic acid are illustrative of those commonly employed apart from the need for an acid catalyst the amounts of monomers which may be employed are critical within fairly narrow ranges in order to achieve consistent or reproducible acceptable results it has been found that the ranges of monomers which may be employed are 1 from about 1 5 to about 2 5 parts by weight of the monomer of formula i 2 from about 11 to about 14 parts by weight of the ethylenically unsaturated acid 3 from about 70 to about.