Back to results
US 4,540,440 AGranted
Ivorylike composition plate for covering a wooden base and a method for producing the same
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorYutaka Oshima
Life of this patent
Estimating the term…
Abstract
An artificial ivorylike composition plate having ideal properties well suited, just like natural ivory, for covering a wooden base for key of a musical instrument is produced by dispersing non-hydrated inorganic filler in casein matrix with later hardening by folmalin.
Claims7
An ivorylike composition plate for covering a wooden base comprising
- casein matrix hardened with folmaldehyde and
- from about 14.3 to about 69.5% by weight of non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate.
A method for producing an ivorylike composition plate for covering a wooden base comprising the steps of
- mixing and kneading casein resin and non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate, with water to form a mixture;
- shaping said mixture to a shaped plate;
- and
- impregnating said shaped plate with formaldehyde to harden said casein resin, said non-hydrated inorganic filler being present in said mixture in an amount sufficient for providing an ivorylike composition plate containing from about 14.3 to about 69.5% by weight of said non-hydrated inorganic filler.
1 more element
Dependencies are inferred from the claim text.