C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 77/08 (2006.01) C08K 5/057 (2006.01) C08L 83/04 (2006.01) C09K 3/10 (2006.01)
Patent
CA 2178578
The specification describes and claims a composition curable in presence of atmospheric moisture to an elastomeric body, comprising (A) the product formed by mixing a polymeric material having at least two groups bonded to silicon which are hydroxyl or hydrolysable (eg alkoxy) groups and an alkoxysilane curative and (B) a compound according to the general formula M[OR]x[OR']y where M represents a metal having a valency of 4 selected from Group IVB of the Periodic Table and is preferably titanium, x has a value from 0 to 1, y has a value from 3 to 4 and (x + y) = 4, R' represents a group selected from monovalent tertiary and branched-secondary aliphatic hydrocarbon groups and R represents a monovalent linear aliphatic hydrocarbon group having 1 to 6 carbon atoms which is different from R'. Preferred compounds (B) are those in which R' represents C(R2R3R4) in which each of R2, R3 and R4 represents a monovalent aliphatic chain having 1 to 6 carbon atoms, the most preferred groups R' being tertiary butyl and t-amyl groups. The compositions cure without need for the presence of a chelating agent and the preferred compositions cure quickly and do not yellow.
Debuyl Francois
Leempoel Patrick
Dow Corning S.a.
Gowling Lafleur Henderson Llp
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