The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1992
Filed:
Mar. 25, 1991
Linneaus C Dorman, Midland, MI (US);
John A Rice, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A family of composite materials consisting of a mineral filler and a synthetic polymer are provided which are characterized by properties similar to natural ivory. The ivory-like composite material contains about 25 to about 75 percent by weight of the mineral filler, preferably a calcium phosphate. In addition, the composite material contains about 75 to about 25 percent by weight of the polyamino acid, preferably an .alpha.-amino acid such as poly(gamma-methyl L-glutamate). The composite material is formed using in situ polymerization techniques, thereby ensuring intimate and homogeneous blending of the mineral and polymer phases as well as facile preparation at ambient temperatures. In addition, the ivory-like composite material is molded using an isostatic compression molding technique. The composite material may be molded to form virtually any desired shape for decorative or practical purposes, or for subsequent carving. The resulting ivory-like composite materials are characterized by properties similar to natural ivory.