C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
403/51
C08L 83/04 (2006.01) C08J 9/02 (2006.01) C08K 5/05 (2006.01)
Patent
CA 1333207
The specification describes and claims a method of producing a foamed mass having a density of less than 150kg/m3 adherent to surfaces of a cavity which comprises inserting into the cavity a foamable composition formed by mixing impinging jets of two or more parts of a foamable silicone composition capable of curing at 20°C within 2 minutes to provide a foamed mass having a density of less than 150kg/m3. The composition comprises (a) one or more polysiloxanes having not less than three alkylhydrogensiloxane units per molecule, (b) one or more polysiloxanes having not less than two silicon-bonded hydroxyl groups per molecule, (c) one or more compounds having carbon- bonded hydroxyl groups present in a proportion to provide from 0 to 2% by weight of the composition, (d) a polyorganosiloxane comprising Image , Image and Image units and silicon-bonded hydroxyl groups wherein each R represents a mono- valent hydrocarbon group containing from 1 to 20 carbon atoms, m is an integer having an average value from 1 to 20, n has the value l or 2, and p has the value 1, 2 or 3, and (e) a platinum catalyst for promoting reaction between the ingredients. The composition is provided as said two or more parts, each of the parts having a similar viscosity at 25°C one to the other, which is less than 15000 mm2/s, and the components being present in the mixed composition in proportions such that the ratio of silicon- bonded hydrogen atoms of said one or more polysiloxanes having not less than three alkylhydrogen siloxane units per molecule to silicon-bonded hydroxyl groups and carbon-bonded hydroxyl groups of the other components of the composition lies in the range 1:1 to 6:1. The method enables rapid production of foamed in situ masses having sound deadening and fire resistant properties, suitable for use for example in automobiles.
596715
Dow Corning Limited
Gowling Lafleur Henderson Llp
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