Rhodia Chimie

Bluestar Silicones France Sas

Elkem Silicones France Sas

Bluestar Silicones France

Marc Chaussade

Nathalie Guennouni

Christiane Prebet

This invention is directed to single-component alkoxy silicon sealants and methods of making the sealants. The sealants are made from a masterbatch M that includes at least one organopolysiloxane A having terminal and/or pendant alkoxylated groups and at least one mineral filler B.

Organopolysiloxane compositions that harden into elastomers at ambient temperature in the presence of moisture

The invention relates to a method of preparing polyorganosiloxanes containing at least one functional group using a lithium silanolate catalyst. A polyorganosiloxane, having at least one hydroxyl group, is reacted with a polyalkoxysilane having the formula (R)(R)Si(OR)(I), where Ris an alkyl radical, a cycloalkyl radical, or an aryl radical; Ris &#x2014;(Z)m-(X)n, wherein m=0 or 1, n=1 or 2; Z is a divalent hydrocarbon residue; X is an unsaturated hydrocarbon radical when m=0 and, when m=1, X is chlorine, bromine, iodine, &#x2014;O&#x2014;CO&#x2014;CR&#x2550;CRR(in which R, Rand Reach represent a hydrogen atom, an alkyl radical and/or a phenyl radical), &#x2014;R(in which Ris a perfluorinated residue), &#x2014;NHR(in which Ris a hydrogen atom, an alkyl radical, or a radical-R&#x2014;NH, wherein Ris Z), or &#x2014;SH; Ris an alkyl radical; a=0, 1, 2 or 3; b=0 or 1 and a+b=0, 1, 2 or 3, with the additional condition that the sum a+b=3, symbol b cannot be equal to 0. The method is performed in the presence of an effective quantity of a lithium organosilanolate catalyst having formula (R)(R)(OR)SiOLi(II), wherein R, R, R, a and b have the meanings indicated above. The method is performed without the addition of an aliphatic alcohol having the formula ROH to the reaction medium.

Method of preparing polyorganosiloxane with functional groups in the presence of lithium silanolate

The invention relates to polyorganosiloxane monocomponent compounds (POS) which are stable when stored without humidity and crosslinking into elastomer in the presence of water. The inventive compounds comprise at least one type of crosslinkable linear polyorganosiloxane (POS), a mineral filler and a crosslinking catalyst of formula (I) which provides said compound with an excellent compromise between cross linking kinetics and a storage stability (i.e. more than 6 months).

Polyorganosiloxane monocomponent compound crosslinking into silicone elastomer

Single-component silicone compositions which are stable on storage in the absence of moisture and which crosslink by polycondensation reactions catalyzed using a mixed titanium/metal catalyst to give non-yellowing elastomers which adhere to various supports, the reactions being carried out at ambient temperature and in the presence of water; each single-component POS composition comprises: 100 parts by weight of linear diorganopolysiloxane(s) A functionalized at the chain ends by functional group Rof alkoxy, acyloxy, iminoxy or enoxy type; 0 to 30 parts by weight of polysiloxane resin(s) B; 0 to 15 parts by weight of crosslinking agent(s) C; 0 to 2 parts by weight of aliphatic alcohol(s) E; 0 to 30 parts by weight of non-functionalized and unreactive linear diorganopolysiloxane(s) F; 2 to 40 parts by weight of inorganic filler G; 0 to 20 parts by weight of auxiliary agent(s) H; and 1 to 150 &#x3bc;g.at (microgram atom) of the metals M1+M2 per 1 g of single-component POS composition, wherein M1 is selected from among titanium, zirconium and mixtures thereof and M2 is selected from among zinc, aluminum, boron, bismuth and mixtures thereof.

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Villeurbanne, France

Marc Chaussade