Printed circuit boards
AssigneeAlbemarle Corporation
InventorsNeil Brown, Michael Aggleton
Life of this patent
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Abstract
Printed circuit boards of a laminate having surface layers of curable resin impregnated woven glass fabric and intermediate layers of curable resin impregnated non-woven glass. The intermediate layers contain 200 percent by weight to 275 percent by weight, based on the resin in the intermediate layers, of a thermally stable aluminum hydroxide of the molecular formula Al2O3.nH2O, wherein n has a value of 2.6<n<2.9. The aluminum hydroxide has a specific surface area, measured by the BET method, of 2 to 10 m2/g and a particle size in the D50% range of 5 to 10 μm.
Claims19
A printed circuit board comprising a laminate prepared by a method for the preparation of the laminate by combining together surface layers comprising curable resin impregnated woven glass fabric and intermediate layers comprising curable resin impregnated non-woven glass, the intermediate layers contain 200 percent by weight to 275 percent by weight based on the resin in the intermediate layers, of a thermally stable aluminum hydroxide of the molecular formula Al2O3.nH2O, wherein n has a value of 2.6<n<2.9, and the aluminum hydroxide has a specific surface area, measured by the BET method, of 2 to 10 m2/g and a particle size in the D50% range of 5 to 10 μm.
A printed circuit board comprising a laminate having surface layers comprising curable resin impregnated woven glass fabric and intermediate layers comprising curable resin impregnated non-woven glass, the intermediate layers contain 200 percent by weight to 275 percent by weight, based on the resin in the intermediate layers, of a thermally stable aluminum hydroxide of the molecular formula Al2O3.nH2O, wherein n has the value of 2.6<n<2.9, and the aluminum hydroxide has a specific surface area, measured by the BET method, of 2 to 10 m2/g and a particle size in the D50% range of 5 to 10 μm.
Dependencies are inferred from the claim text.