Patent ID: 6753300
Filing Date: 2004-06-22
Classification: B23Q,H05K,Y10T

Abstract:
A lubricant sheet for making a hole used for a printed circuit board, comprising an organic substance layer having a thickness of 0.02 to 3.0 mm and formed of a mixture (a) or a mixture (b) and a metal foil having a thickness of 0.05 to 0.5 mm,said organic substance layer being formed on one surface of said metal foil, said mixture (a) being a mixture containing 20 to 90 parts by weight of polyether ester (I), 10 to 80 parts by weight of a solid water-soluble lubricant (II), the total amount of the polyether ester (I) and the solid water-soluble lubricant (II) being 100 parts by weight, and 2 to 10 parts by weight of polyethylene glycol (III) having a number average molecular weight of 200 to 600, and said mixture (b) being a mixture containing 20 to 90 parts by weight of said polyether ester (I), 10 to 80 parts by weight of said solid water-soluble lubricant (II), the total amount of the polyether ester (I) and the solid water-soluble lubricant (II) being 100 parts by weight, and 2 to 20 parts by weight of a liquid water-soluble lubricant (IV).