Patent ID: 7297633
Filing Date: 2007-11-20
Classification: C09G,H01L

Abstract:
1. A method of manufacturing a composition for polishing silica and silicon nitride on a semiconductor substrate comprising: providing a carboxylic acid polymer in aqueous solution; contacting the aqueous solution with an ion exchange resin to remove soluble cations and ammonia from the aqueous solution providing an ion-exchanged carboxylic acid polymer in aqueous solution; adding (i) an abrasive, (ii) a quaternary ammonium compound and (iii) phthalic acid or a phthalic acid salt to the ion-exchanged carboxylic acid polymer in aqueous solution to provide a slurry having 0.01 to 5 wt % of the ion-exchanged carboxylic acid polymer, 0.001 to 1 wt % of the quaternary ammonium compound, 0.001 to 1 wt % of the phthalic acid or phthalic acid salt and 0.01 to 5 wt % abrasive.