Abstract: A catalyst/cross-linking agent composition, containing at least onea) vinyltrialkoxysilane as cross-linking agent,b) dialkyltin oxide as catalyst,c) optional organic acid for the control of the reaction time,d) optional inert solvent, ande) optional dye or colored pigment,is especially useful for condensation/cross-linking of polysiloxanes, such as OH-endstopped polydimethylsiloxane, in making moldings. Especially useful for impression taking in the dental field.

Abstract: The present invention relates to a transparent material based on addition-crosslinking polysiloxanes, which is used as occlusal print for molding side teeth composites.

Abstract: The invention relates to a pasty two-component alginate-based material which is used as an impression material in the dental sector.

Abstract: 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.

Abstract: 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.

Abstract: In a silicone impression and duplicating composition which undergoes crosslinking at ambient temperature by an addition reaction, comprising(a) an organopolysiloxane possessing two or more vinyl groups in the molecule,(b) optionally an organopolysiloxane without reactive groups,(c) an organopolysiloxane possessing two or more Si-H groups in the molecule,(d) a catalyst,(e) a filler and,(f) optionally an auxiliary and/or colorant, the improvement wherein polysiloxane components (a)-(c) contain not more than about 1.5% by weight of volatile oligomers, whereby the dimensional stability of impressions is improved.

Abstract: 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.

Abstract: 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).

Abstract: In the making of an impression wherein an impression material comprising an alginate, a pulverulent material and a dust-reducing coating is mixed with water to form a paste, the paste is positioned about a mold member, and permitted to harden, the improvement wherein such coating comprises an iso-paraffin. There is reduced dusting.

Abstract: The present invention relates to the use of paraffin waxes or microwaxes in silicone pastes, in particular in kneadable compositions for the production of accurate impressions of teeth. The silicone pastes are preferably cold-vulcanizing two-component silicone rubber systems which are known per se and in which two pastes are mixed and then crosslink after about 2-5 minutes at room temperature.

Abstract: In the making of a shaped structure by mixing(a) a cross-linkable organopolysiloxane,(b) hydrophobic filler particles,(c) paraffin oil,(d) a colorant, and(e) a cross-linking catalyst,the improvement which comprises employing as (b) hydrophobic filler particles of which the surface has been laden with 0.5-5% by weight of paraffin oil. The filler can be present in either or both of a cross-linkable silicone component and a catalyst component; each component can contain other ingredients but will not cure until the two components are brought together. Truer dental impressions are thereby formed.

Abstract: In a polysiloxane-based composition which crosslink by addition, comprising (a) an organosiloxane with two or more vinyl groups in the molecule, (b) and organo-hydridopolysiloxane, as a crosslinking agent, (c) a catalyst for accelerating the addition reaction, (d) a hydrophobic filler and (e) optionally a dyestuff pigment, the improvement which comprises (f) hydrogenated castor oil as a structuring agent. The composition is highly viscous and will not run but can readily be stirred.

Abstract: The invention relates to thixotropic formulations of silicone pastes for the production of exact impressions of teeth and mucous membrane.

Abstract: In a polysiloxane-based dental composition which crosslinks by an addition reaction and hardens at room temperature, the composition comprising(a) an organopolysiloxane with at least two vinyl groups in the molecule,(b) an organohydridopolysiloxane,(c) a catalyst to accelerate the addition reaction, and(d) a hydrophobic filler, the improvement which comprises including therein(e) an aluminosilicate containing finely divided palladium. This removes any by-product hydrogen and results in a smoother surface on any plaster of Paris moldings made from the hardened composition.