Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1981-11-05
1983-08-02
Bleutge, John C.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
523115, 523116, 525193, 525223, 525224, 525226, 525903, C08F26506, A61K 608
Patent
active
043964761
ABSTRACT:
Compositions 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 C.sub.1 -C.sub.6 alkyl acrylic acid and a C.sub.1 -C.sub.20 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 C.sub.1 -C.sub.6 alkyl acrylic acid and a C.sub.1 -C.sub.20 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 C.sub.1 -C.sub.6 alkyl acrylic acid and a C.sub.1 -C.sub.20 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.
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"Characteristics of Fine Particles", Lapple, Chemical Engineering, 11 Jun. 1962, p. 207.
Roemer Frederick D.
Tateosian Louis H.
Bleutge John C.
Dentsply Research & Development Corporation
Koeckert Arthur H.
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