Patent EA-001578-B1 (EA)
Title: Aqueous silicon dispersion
Inventor: FEDER MICHEL
IPC: C08L83/04
Filed: 1997-09-26
Abstract: 1. An aqueous silicon dispersion cross-linked by condensation into an adhesive elastomer, characterized in that it comprises, at least partially, - A - at least one polydiorganosiloxane (POS), comprising in each molecule, at least two OH groups; - B - at least one water-soluble adherence promoter selected from silane and/or hydroxylated POS, comprising in each molecule at least one hydroxyl group and at least one hydrophilic functional adherence group with the base (Fas) and a mixture thereof and is free from a product resulting from the hydrolysis of the alkoxylated epoxy-functional silanes. 2. The dispersion of claim 1, characterized in that further comprises at least one metal organic catalyst (C) of condensation. 3. The dispersion of claim 2, characterized in that further comprises: - D - at least one surfactant and - E - optionally at least one cross-linking agent, provided that: * 1 * in the presence of such cross-linking agent (E) the promoter (B) comprises at least one group OH in each molecule, * 2 * in the absence of such cross-linking agent (E) the promoter (B) and/or POS (A) comprises at least three groups OH in each molecule. 4. The dispersion of claims 1 to 3, characterized in that POS (A) is an oil of formula:   where n >= 10, R<1> and R<2>, identical or different, correspond to hydroxyl, (cyclo)alkyl C1-C6 or amine. 5. The dispersion of claims 1 to 4, characterized in that water-soluble adherence promoter (B) is hydroxylated linear polydiorganosiloxane with siloxylated links D and/or MD and/or hydroxylated resin POS comprising siloxylated links T or siloxylated links Q and M and/or D and/or T, wherein M is a link R3SiO1/2, D is a link R2SiO2/2, T is a link RSiO3/2, and Q is a link SiO4/2, where R is hydrocarbon radical or the functional group Fas and in that said promoter comprises at least one group Fas bonded with at least one Si. 6. The dispersion of claim 5, characterized in that the promoter (B) is resin selected from resins of a type T(OH), DT(OH), DQ(OH), DT(OH), MQ(OH), MDT(OH), MDQ(OH) or a mixture thereof, where M, D, T, Q have meanings as defined in claim 5. 7. The dispersion of claims 1 to 6, characterized in that the promoter (B) comprises one or several groups Fas, identical or different, comprising functional groups amino, epoxy, acrylo, methacrylo, ureido, mercapto, thiol, chloroalkyl. 8. The dispersion of claims 1 to 7, characterized in that the adhesion promoter (B) (similar to POS (A) ) is used as a separate cross-linking agent or as an additive to the cross-linking agent (E), formed by at least one hydroxylated resin, which comprises in each molecule at least two different siloxylated links selected from links of type M, D, T and Q, and/or by at least one of the following products: siliconates, silicates, silices (in powder or colloids). 9. The dispersion of claims 1 to 8, characterized in that comprises a silicon-containing or not filler. 10. The dispersion of claims 1 to 9, characterized in that further comprises one or several additives selected from dispersing agents, plasticizers, antifungal agents, antifoaming agents, stabilizers or thickening agents, bases or mixtures thereof. 11. A putty, material for sealing, film, paint or coating (RSE), characterized in that comprises said dispersion of any preceding claim.