Lubricant sheet for making holes and method of making holes with drill

摘要

A lubricant sheet suitable for use in a process of making a hole in a printed circuit board, which sheet comprises an organic 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 layer being formed on one surface of said metal foil, said mixture (a) being a mixture containing 20 to 90 parts by weight of a polyether ester component (I), 10 to 80 parts by weight of a solid water-soluble lubricant (II) and 2 to 10 parts by weight of a polyethylene glycol (III) having a number average molecular weight of 200 to 600, the total amount of the polyether ester component (I) and the solid water-soluble lubricant (II) being 100 parts by weight, and said mixture (b) being a mixture containing 20 to 90 parts by weight of a polyether ester component (I), 10 to 80 parts by weight of a solid water-soluble lubricant (II) and 2 to 20 parts by weight of a liquid water-soluble lubricant (IV), the total amount of the polyether ester component (I) and the solid water-soluble lubricant (II) being 100 parts by weight.