摘要:
The invention describes solid materials, especially for dental purposes like, e.g., composite milling blocks (CMBs), which can be obtained by ring-opening metathesis polymerization (ROMP). Also described is a method for obtaining such milling blocks, their use and applications of the compositions.
摘要:
The present invention features ionomer compositions containing a filler surface modified with a polyacid. The compositions can be used in a variety of dental and orthodontic applications, for example, as adhesives, cements, restoratives, coatings and sealants.
摘要:
The invention relates to curable silicone compositions which contain silane based crosslinkers and a mixture of different organopolysiloxanes. The compositions are particularly suitable as curable impression materials in dental applications.
摘要:
Processes for forming dental materials that include applying a first hardenable dental composition (e.g., a dental adhesive) to a surface followed by applying a second hardenable dental composition (e.g., a dental composite) to the first hardenable dental composition on the surface. The first and second hardenable dental compositions are hardened such that the second hardenable composition is substantially completely hardened prior to complete hardening of the first hardenable composition.
摘要:
The invention relates to a curable composition comprising addition curable silicone component (A) having a linear siloxane backbone at least one unsaturated, non-activated side group pendant from the Si atom or atoms in the backbone, component (A) having an equivalent weight in the range of about 68 to about 1000, crosslinker component (B) comprising at least 2 SiH groups, catalyst component (C) being able to catalyse the reaction between component (A) and component (B), filler component (D), wherein the equivalent weight is defined as (molecular weight of the molecule)/(number of unsaturations in the molecule).
摘要:
The invention relates to impression compositions based on vulcanizable pother materials, which are characterized in that the ready-mixed pastes comprisea) approx. 30 to 70 wt. % of aziridino-polyether,b) approx. 5 to 20 wt. % of a triacyl glyceride of non-animal origin which has a stearoyl content of .gtoreq.70 wt. %, based on the acyl content of the triacyl glyceride, or, in the case of a lower stearoyl content and if this adversely influences the storage stability of the impression composition, has been esterified in itself beforehand, andc) approx. 10 to 65 wt. % of customary catalysts, auxiliaries and additives,in each case based on the total weight of the composition.The impression compositions are distinguished by consistently good mechanical properties of the polymerized materials, have a comparatively low proportion of aziridino-polyether, which has a favourable effect on their preparation costs, and can easily be mixed. During storage of the compositions over long periods of time, no noticeable increase in viscosity occurs, even at elevated temperatures.
摘要:
The invention relates a process for producing isocyanates comprising the steps of a) providing an azolide and optionally a solvent, and b) adding an acid at a temperature below about 40 C. The invention also relates to the isocyanate obtainable by such a process.
摘要:
The invention relates to a dental composition comprising a) a compound (A) with the following features: only one backbone unit (U) with 6 to 20 carbon atoms, at least 6 carbon atoms thereof forming an aromatic or an aliphatic cyclic moiety, the remaining carbon atoms either being part of substituents pending from the cyclic moiety or being part of bridging groups to spacer units, wherein one or more of the remaining carbon atoms can be replaced by an oxygen atom, the backbone unit not comprising a bisphenol structure and halogen atoms, one or two unit(s) (S) being connected to the backbone unit (U) via an ether linkage, at least one unit (S) comprising a —CH2-CH2-CH2-CH2-O—CH2-CH(Q)-OG moiety or a —CH2-CH(OG)-CH2-OM moiety or a mixture of these two types of moieties within one unit (S), with G comprising at least one polymerizable moiety and an urethane moiety, the urethane moiety acting as connecting element to unit(s) (S), and M comprising at least one group selected from acroyl, methacroyl, aryl, mixtures and combinations thereof, Q comprising at least one group selected from hydrogen, methyl, phenyl, phenoxymethyl, mixtures and combinations thereof, and with the proviso that onto the backbone unit (U) at least two substituents are attached, each bearing at least one group G, wherein in the case where only one unit (S) is present, the group G not being part of said unit (S) is located in the further substituent pending from unit (U), b) a filler (B) and c) an initiator (C).
摘要:
The invention relates a process for producing isocyanates comprising the steps of a) providing an azolide and optionally a solvent, and b) adding an acid at a temperature below about 40 C. The invention also relates to the isocyanate obtainable by such a process.