Delayed action tin catalysts

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/24 (2006.01) B01J 38/02 (2006.01) C07F 7/22 (2006.01) C08G 18/48 (2006.01)

Patent

CA 2421138

An improvement in a process wherein an organotin compound is used as a catalyst is disclosed, wherein the improvement comprises: A) employing a latent catalyst that is substantially catalytically ineffective at room temperature, wherein said latent catalyst is selected from the group consisting of unsymmetrically substituted tetrahydrocarbyl tin compounds of the formula: R x R'4-x Sn wherein R' is a hydrocarbyl group that is substantially inert under usual conditions of storage and use, R' is a hydrocarbyl group that is more reactive than R under conditions of use, x is l, 2, or 3; and B) then heating the curable mixture to a temperature in the range of from about 30 up to about 99°C to activate the catalyst.

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