Patent ID: 6168900
Filing Date: 2001-01-02
Classification: G03F,Y10S

Abstract:
Chemically amplified resist comprising as its active material: (A) a first polyhydroxystyrene polymer having a t-butoxycarbonyl group and a photoacid generator, said first polyhydroxystyrene polymer having an average molecular weight between 8,000 and 30,000, wherein 25% to 45% of the hydroxyl groups of said first polyhydroxystyrene polymer are protected by said t-butoxycarbonyl group; and, (B) a second polyhydroxystyrene polymer having a t-butoxycarbonyl group, average molecular weight of the second polyhydroxystyrene polymer being equal to or greater than 400 and less than 6,000, wherein 25% to 45% of the hydroxyl groups of said second polyhydroxystyrene polymer are protected by said t-butoxycarbonyl group; wherein (a) the ratio of the average molecular weight of said first polyhydroxystyrene polymer and the average molecular weight of said second polyhydroxystyrene polymer is between 5:1 and 20:1, and (b) wherein 10 to 30 parts by weight of the second polyhydroxstyrene polymer is comprised for 100 parts by weight of the first polyhydroxstyrene polymer.