摘要:
Room temperature curable compositions, which can be stored under anhydrous conditions, but when exposed to atmospheric moisture at room temperature cure to an elastomer comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups and a condensation catalyst, if desired, in which at least a portion of the silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups is obtained from the reaction of an alkyltriacetoxysilane and tert-butanol in aqueous acetic acid.
摘要:
Compositions which are storable under anhydrous conditions, but when exposed to atmospheric moisture crosslink at room temperature to form elastomers comprising a diorganopolysiloxane having one Si-bonded hydroxyl group in each of its terminal units, and a cyclic silane of the formula ##STR1## where R represents a divalent hydrocarbon radical, R.sup.1 represents the same or different monovalent hydrocarbon radicals, which can be substituted by an alkoxy group, and R.sup.2 represents hydrogen or an alkyl or aminoalkyl radical in which the silicon atom of the cyclic silane is bonded to a nitrogen atom and to two monovalent hydrocarbon radicals, which can be substituted with an alkoxy group via oxygen and to a hydrocarbon radical via carbon.
摘要:
The invention relates to organopolysiloxane compositions which are stable when stored under anhydrous conditions, but when exposed to moisture cure to an elastomer containing (a) a diorganopolysiloxane having terminal condensable groups, (b) a silicon compound having 3 amino groups bonded to silicon via nitrogen and/or oxime groups bonded to silicon via oxygen per molecule and (c) a silicon compound having at least one thiol group selected from mercapto-functional silanes or siloxanes. The presence of the mercapto-functional silanes or siloxanes substantially retards the formation of skin but does not substantially extend the cure time of the organopolysiloxanes compositions. These compositions are useful in, for example, screen printing, where a long skin-over time is desired.
摘要:
Compositions which can be stored under anhydrous conditions but when exposed to moisture crosslink at room temperature to form elastomers, comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound containing at least three hydrolyzable groups per molecule which are bonded to silicon, and an alkylenediamine in which at least one hydrogen atom that is bonded to a nitrogen atom of the alkylenediamine is substituted with a polyalkylene oxide.
摘要:
The invention relates to organopolysiloxane compositions which can be crosslinked to form elastomers with the elimination of alcohols and are stabilized by salts of the second main group or sub-group with branched-chain carboxylic acids having from 5 to 15 carbon atoms.
摘要:
Curable compositions which can be stored under anhydrous conditions, but when exposed to atmospheric moisture cross-link to form elastomers, which consists of (1) a diorganopolysiloxane having terminal condensable groups, (2) a silicon compound containing at least three hydrolyzable groups per molecule in which the hydrolyzable groups are amino groups bonded to silicon via nitrogen and/or oxime groups bonded to silicon via oxygen and (3) at least one additional component which improves adhesion of the elastomers obtained from said compositions to substrates, in which the additional component (3) is an organosilicon compound containing at least one siloxane-oxygen atom and at least one amino group which is bonded to silicon by carbon.
摘要:
Compositions which can be crosslinked by radiation to form elastomers comprising (a) an organopolysiloxane containing triorganosiloxane units of the formulaH.sub.2 C=CHCXOR.sup.1 SiR.sub.2 O.sub.1/2in which R is selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, R.sup.1 is selected from divalent hydrocarbon radicals and divalent halogenated hydrocarbon radicals and X is selected from oxygen and sulfur, in which at least 80 percent of the siloxane units other than the triorganosiloxane units are diorganosiloxane units, where the SiC-bonded organic radicals of the triorganosiloxane units and the diorganosiloxane units are selected from monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, (b) a filler having a surface area of at least 50 m.sup.2 /g, and if necessary (c) a photoinitiator, where the organopolysiloxane (a) contains diorganosiloxane units in which one of the SiC-bonded organic radicals contains an aliphatic carbon-carbon double bond, and/or the compositions contain, in addition to components (a), (b) and if necessary (c), and at least one (d) organopolysiloxane resin containing units of the formulasR.sup.2.sub.3 SiO.sub.1/2 and R.sup.2 SiO.sub.3/2 and/or SiO.sub.4/2where R.sup.2 is selected from monovalent hydrocarbon radicals, halogenated hydrocarbon radicals and hydrogen, with the proviso that at least an average of 4 Si-bonded hydrogen atoms are present in each molecule of the polysiloxane resins, in which siloxane units of the formulaHSR.sup.1 SiROin an amount of from 0.1 to 5 such siloxane units per radical of the formulaH.sub.2 C=CHCXOR.sup.1,where R, R.sup.1 and X are the same as above, are excluded in organopolysiloxane (a) if the organopolysiloxane resin (d) is omitted from the compositions.
摘要:
A process for simultaneously cleaning and rendering building materials hydrophobic which comprises applying to the surface of the building material a solution of a hydrophobic agent having admixed therewith a filler having a surface area of at least 50 mg.sup.2 /g and after evaporation of the solvent, removing the filler residue.
摘要:
Compositions which crosslink to form elastomers and are based on(A) hollow polymer bodies,(B) addition-crosslinkable organosilicon compounds, and(C) organic sulfur compounds.
摘要:
This invention relates to silanes of the general formulaR.sub.n Si(OCR.sub.2.sup.1 COZR).sub.4-nwhere R represents the same or different monovalent hydrocarbon radicals or substituted monovalent hydrocarbon radicals, R.sup.1 is hydrogen or the same as R, Z is oxygen or the group ##STR1## where R.sup.1 is the same as above, n is 0 or 1 and oligomers thereof. These silanes are prepared by reacting silanes of the general formulaR.sub.n SiX.sub.4-nwhere R and n are the same as above and X represents the same or different hydrolyzable atoms or condensable groups other than RCOCR.sub.2.sup.1 CO groups, with alpha-hydroxycarboxylic acid esters or amides. The silanes, which have at least three condensable groups per molecule, may be mixed with a diorganopolysiloxane containing terminal condensable groups and at least one additional substance to prepare compositions which are storage-stable under anhydrous conditions, but crosslink when exposed to moisture at room temperature to form elastomers.