Blend of cross-linked polymer, swelling monomer and cross-linking agent and curing process
Patent 4396476 Issued on August 2, 1983. Estimated Expiration Date: 
November 5, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 5, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3427274 3470615 3914341 Bioimplantable device from crosslinked, swollen, hydrophilic polymers Fast curing resinous compositions Dental materials which are opaque to X-rays and are based on organic plastics in paste form Dental materials based on organic plastics in paste form Dental material based on crosslinked plastic and polymerizable binder Patent #: 4369262 InventorsAssigneeApplicationNo. 06/318356 filed on 11/05/1981US Classes:522/109, Processes of chemically modifying a blend of two or more solid polymers in the presence of a chemical reactant; or compositions therefore523/115, Composition suitable for use as tooth or bone replacement, restorative, or implant523/116, Cement or filling composition525/193, Agent contains an ethylenic group525/223, Ester contains an oxygen atom other than as part of a carboxylic acid ester group525/224, Ester derived from both an unsaturated carboxylic acid and an unsaturated alcohol525/226, Ester derived from polyol525/903INTERPENETRATING NETWORKExaminersPrimary: Bleutge, John C.Assistant: Koeckert, Arthur H. Attorney, Agent or FirmInternational ClassesC08F 265/00 (20060101)C08F 291/00 (20060101) C08F 265/06 (20060101) A61K 6/02 (20060101) A61K 6/083 (20060101) AbstractCompositions hardenable by exposure to heat or electromagnetic radiation are provided by blending from about 0% to about 50% by weight of an uncrosslinked polymer, from about 20% to about 66% of a polymerizable monomer capable of dissolving said polymer, from about 10% to about 70% of a crosslinked polymer in the form of discrete particles having average diameters of from 0.001 micron to about 500 microns and being swellable by said monomer, and from about 0.25% to about 27% of a crosslinking agent for said monomer. Such compositions exhibit superior chemical and physical characteristics when hardened and are suitable in a wide variety of applications as construction media. In accordance with a preferred form of the invention, a precursor blend is formed from a mixture comprising (A) from 13 to 52 weight percent of a crosslinked polymer of an ester of a C1 -C6 alkyl acrylic acid and a C1 -C20 alkyl or cycloalkyl alcohol, said crosslinked polymer being in the form of fine particles at least 50% by weight of which have average diameters less than 150 microns; (B) from 13 to 34 weight percent of an uncrosslinked polymerized ester of a C1 -C6 alkyl acrylic acid and a C1 -C20 alkyl or cycloalkyl alcohol having an average molecular weight of from 500,000 to 900,000 g/mole; (C) from 25 to 55% by weight of a polymerizable monomeric ester of a C1 -C6 alkyl acrylic acid and a C1 -C20 alkyl or cycloalkyl alcohol, which monomeric ester is capable of dissolving said uncrosslinked polymerized ester and of swelling, or interpenetrating, said crosslinked polymer particles; and (D) from 7% to 22% by weight of a crosslinking agent for said polymerizable monomeric ester. Such precursor blends, after being aged for a time sufficient to insure that the crosslinked polymer particles have become substantially fully swollen with or interpenetrated by the mixture of monomeric ester and crosslinking agent, is especially suitable in the production of prosthetic dental appliances, such as, for example, prosthetic teeth.Other References
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