摘要:
A silicone emulsion which can be converted into an elastomeric product under ambient conditions by eliminating and evaporating water and alcohol or carboxylic acid, comprising by weight approximately(A) 100 parts of a hydroxyl-terminated polydiorganosiloxane having a molecular weight of at least about 50,000,(B) 1 to 400 parts of a low molecular weight, reactive acyloxy or alkoxy-functional silicone resin,(C) 0.1 to 20 parts of a catalytic compound,(D) 0 to 200 parts of a thixotropic filler and(E) 0 to 200 parts by weight of a non-thixotropic filler, the silicone emulsion having a solids content of about 20 to 85% by weight. The emulsion is especially suited for coatings and sealants.
摘要:
The present invention relates to the preparation of organooxychlorosilanes. They are produced by reacting the corresponding chlorosilane with an alcohol in the presence of a catalyst system consisting of hydrogen chloride and a cocatalyst.
摘要:
A silicone composition which is stable in the absence of moisture but which in the presence of water will cure at room temperature to an elastomer, comprising a polyorganosiloxane having reactive end groups, a polyester and a thickening filler.
摘要:
In a polydiorganosilixane composition which is capable of storage in the absence of moisture and can be cured at ambient temperature under the action of water or moisture to give elastomers, the composition comprising a diorganosiloxane having reactive terminal groups, a diorganosilane having groups which are sensitive to hydrolysis, a cross-linking agent, and optionally fillers which have a thixotropic effect, condensation catalysts and/or other known auxiliaries, the improvement which comprises employing as the silane (a) a silane of the formulaRR.sup.1 Si(NR.sup.2 R.sup.3).sub.2plus (b) an organosilane of the formulaRSi (O--N.dbd.R.sup.4).sub.3in whichR, R.sup.1, R.sup.2 and R.sup.3 each independently is alkyl, aryl, aralkyl and vinyl groups, orR.sup.2 and R.sup.3 together can be an alkanediyl radical having up to 8 C atoms or hydrogen, andR.sup.4 is an R.sup.2 R.sup.3 C group having up to 8 C atoms. The composition cures at room temperature in the presence of moisture to elastomers of desirable physical properties.
摘要:
Improved polyorganosiloxane compositions which can be stored with the exclusion of moisture and harden on access to moisture are disclosed. These compositions contain, 100 parts by weight of an .alpha.,.omega.-dihdyroxypolydimethylsiloxane, 0 to 100 parts by weight of an .alpha.,.omega.-bis(trimethylsiloxy)polydimethylsiloxane plasticizer, 1 to 10 parts by weight of an oximinosilane, 5 to 250 parts by weight of a reinforcing or non-reinforcing filler or a filler mixture, 0.01 to 1 part by weight of a tin catalyst, 0.05 to 2.5 parts by weight of an aminoalkylalkoxysilane and 0.5 to 2.5 parts by weight of an accelerator chosen from alkyl or alkenyl carboxylic acids or silane derivatives of such carboxylic acids.