Hardenable compositions, process to make a shaped article therefrom and dental appliance comprising it
申请人:DENTSPLY INTERNATIONAL, INC.
公开号:EP0014515A2
公开(公告)日:1980-08-20
Compositions hardenable by exposure to heat or electro-magnetic 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 C, - C6 alkyl acrylic acid and a C, - 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-C2 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.
可通过受热或电磁辐射硬化的组合物是通过以下混合物提供的:按重量计,约 0% 至约 50% 的未交联聚合物、约 20% 至约 66% 的能溶解所述聚合物的可聚合单体、约 10% 至约 70% 的交联聚合物(以平均直径为 0.001 微米至约 500 微米且可被所述单体溶胀的离散颗粒形式存在),以及约 0.25% 至约 27% 的所述单体的交联剂。这种组合物硬化后具有优异的化学和物理特性,适合作为建筑介质广泛应用。根据本发明的一种优选形式,前驱体混合物由一种混合物形成,该混合物包括 (A) 13 至 52 重量百分比的 C1 - C6 烷基丙烯酸酯和 C1 - C20 烷基或环烷基醇的交联聚合物,所述交联聚合物呈细小颗粒状,其中至少 50%(按重量计)的平均直径小于 150 微米;(B) 13%至 34%的 C, - C6 烷基丙烯酸和 C, - C20 烷基或环烷基醇的未交联聚合酯,其平均分子量为 500,000 至 900,000 克/摩尔;(C) 25%至 55%(重量)的 C1-C6 烷基丙烯酸和 C1-C2 烷基或环烷基醇的可聚合单体酯,该单体酯能够溶解所述未交联聚合酯,并使所述交联聚合物颗粒溶胀或相互渗透;以及 (D) 7%至 22%(重量)的用于所述可聚合单体酯的交联剂。这种前体混合物在经过足够时间的老化,以确保交联聚合物颗粒已与单体酯和交联剂的混合物充分溶胀或相互渗透后,特别适用于生产修复牙科用具,例如,修复牙齿。