Patent ID: 6773863
Filing Date: 2004-08-10
Classification: G03F,Y10S

Abstract:
A resin composition which is a combination of two resinous compounds comprising:a first copolymeric resin consisting of from 62 to 68% by moles of the monomeric units (a) hydroxyl group-containing styrene units, from 15 to 25% by moles of the monomeric units (b) styrene units and from 12 to 18% by moles of the monomeric units (c) acrylate or methacrylate ester units each having a tertiary alkyl solubility-reducing group capable of being eliminated in the presence of an acid and a second copolymeric resin consisting of from 62 to 68% by moles of the monomeric units (a), from 25 to 35% by moles of the monomeric units (b) and from 2 to 8% by moles of the monomeric units (c), in a weight ratio in the range from 9:1 to 5:5.