摘要:
A process for producing an inorganic-organic composition material based on gypsum and polyurethane comprising exposing calcined gypsum or anhydrite to the action of water in the presence of a polyurethane or polyurethane-urea which is dispersible in water and in the presence of up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, and allowing the composition to set while permitting any solvents which may be present to evaporate. The calcium sulphate may be on a textile support or the composition may be molded into flexible shaped articles of good mechanical properties.
摘要:
A hard, resistant material formed by mixing and curinga) at least one polyfunctional silicopolyether,b) at least one monomer which can be subjected to free-radical curing,c) at least one catalyst for polymerization of the free-radical monomers at high temperature, low temperature or under the influence of light, andd) at least one catalyst for the condensation of the silicopolyether.
摘要:
The present invention relates to investment compounds containing zeolites and to models and moulds made from these. The investment compounds according to the invention are used in metal casting, preferably in the preparation of precision castings.
摘要:
In the preparation of a dental appliance wherein an investment compound is mixed with a liquid and then cast, the improvement wherein the investment compound is a plaster- or phosphate-bound investment compound which is free of an anionic surface-active agent and containing an iso-paraffin of the formula ##STR1## in which n denotes 2, 3, 4 or 5.
摘要:
Colored silicone composition comprising:(a) at least one organopolysiloxane,(b) at least one isoparaffin having 8 to 24 carbon atoms, and(c) a dyestuff soluble in (b).
摘要:
A method of making a dental impression which comprises applying to the structure of which an impression is to be made a special prepolymer. The prepolymer is composed of units of at least one macrodiol, at least one aliphatic polyisocyanate, and an unsaturated monoalcohol as chain terminator, wherein the average functionality of the prepolymer based on the unsaturated groups is >2.
摘要:
The present invention relates to optically clear polysiloxane-based compositions which are employed, in particular, for the production of contact optical articles such as contact lenses, scleral lenses and intraocular lenses.
摘要:
An addition or condensation cross-linking molding or lining compound based on silicones comprising(a) an organo polysiloxane containing reactive end groups,(b) a catalyst,(c) a filler, and(d) an isoparaffin having 8 to 24 carbon atoms.The compounds being particularly useful as dental molding compositions.
摘要:
Impression material in the form of a powder, which, on mixing with water, provides a paste which cures to a solid consistency, the material in the form of a powder being made dust-free by additions of a coating agent, which material is characterized in that it contains paraffin as an additive.
摘要:
Contact lenses and contact shells of light-refracting material consisting essentially of a copolymer of(I) from 40 to 90% by weight of methyl methacrylate and(II) from 10 to 60% by weight of methyl acrylate and/or esters corresponding to formula (1): ##STR1## in which R represents H or CH.sub.3,R' represents H, CH.sub.3 or C.sub.2 H.sub.5 andn=1 or 2,the sum of I and II amounting to 100% by weight.
摘要翻译:光折射材料的隐形眼镜和接触外壳基本上由(I)40-90%重量甲基丙烯酸甲酯和(II)共聚物组成,(II)10-60%重量的丙烯酸甲酯和/或对应于式 (1):其中R表示H或CH 3,R'表示H,CH 3或C 2 H 5,n = 1或2,I和II的总和为100重量%。