Metal containing condensation reaction catalysts, methods for preparing the catalysts, and compositions containing the catalysts
View Patent ↗A composition is capable of curing via condensation reaction. The composition uses a new condensation reaction catalyst. The new condensation reaction catalyst is used to replace conventional tin catalysts. The composition can react to form a gum, gel, rubber, or resin.
1. A composition comprising:
(A) a catalytically effective amount of a catalytically active reaction product of a reaction of ingredients comprising
Ingredient i), a metal precursor of general formula M-A a , where M is one metal atom selected from the group consisting of Al, Bi, Ti, Mn, Fe, Co, Cu, Zn, Ga, Ge, Mo, Zr, Hf, Ce, Sm, and Yb, each A is independently a displaceable substituent, and subscript a is 1 to maximum valence number of the metal atom selected for M; and
Ingredient ii), a ligand of general formula (ii), where general formula (ii) is
where each R5, each R6, and each R36 are independently selected from H, a monovalent organic group, an inorganic group, and a halogen, each R35 is independently H or a monovalent organic group, subscript j is 1 or 2, subscript k is 1 or 2, subscript m is 0 or 1, and subscript n is 0 to 4;
and
(B) a silicon containing base polymer having an average, per molecule, of one or more hydrolyzable substituents;
where ingredient (A) catalyzes condensation reaction of the hydrolyzable groups on ingredient (B).
2. The composition of claim 1 , where M is Fe and subscript a is 2 or 3.
3. The composition of claim 1 , where:
the ligand has general formula (ii), and the ligand is selected from the group consisting of
and their isomers.
4. The composition of claim 1 , further comprising at least one additional ingredient distinct from ingredients (A) and (B), where the at least one additional ingredient is selected from the group consisting of: (C) a crosslinker; (D) a drying agent; (E) an extender, a plasticizer, or a combination thereof; (F) a filler; (G) a treating agent; (H) a biocide; (J) a flame retardant; (K) a surface modifier; (L) a chain lengthener; (M) an endblocker; (N) a nonreactive binder; (O) an anti-aging additive; (P) a water release agent; (Q) a pigment; (R) a rheological additive; (S) a vehicle; (T) a tackifying agent; (U) a corrosion inhibitor; and a combination thereof.
5. The composition of claim 1 , where the condensation reaction of the composition produces a reaction product having a visual viscosity value ranging from 1000 cSt to a solid at room temperature when tested according to the method in which the composition is placed in a humidity chamber at room temperature and 50% relative humidity for 48 hours.
6. A method for making the composition of claim 1 comprising: mixing ingredients comprising ingredient (A) and ingredient (B) so as to make the composition.
7. A method comprising: exposing the composition of claim 1 to moisture to prepare a reaction product.