Catalyst system
AssigneeDow Global Technologies LLC
InventorsRaghunath Roy, Bharat I. Chaudhary, Manish K. Mundra, Jeffrey M. Cogen
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Abstract
A catalyst system comprising a combination of a tin-based moisture-cure catalyst, a titanium(IV) compound that is titanium dioxide or a titanium alkoxide, and zinc oxide. A catalyst masterbatch comprising the catalyst system and a carrier resin. A moisture-curable prepolymer formulation comprising the catalyst masterbatch and a (hydrolyzable silyl group)-functional polyolefin prepolymer. Methods of making and using same. Cured polymer products made therefrom. Articles containing or made from same.
Claims11
A catalyst masterbatch comprising:
- from 99 to 1 wt % of a catalyst system comprising a combination of from 75 to 85 weight percent (wt %) of zinc oxide (ZnO), from 10 to 25 wt % of titanium dioxide (TiO2), and from 2 to 10 wt % of a tin-organic ligand coordination complex (Sn Complex), wherein the sum of all wt % equals 100.00 wt %;
- and
- from 1 to 99 wt % of a carrier resin, wherein the carrier resin is a non-aromatic polyolefin polymer, an ethylene/unsaturated carboxylic ester copolymer, or a blend thereof.
A moisture-curable polyolefin formulation comprising from 65 to 99.9 wt % of (A) a (hydrolyzable silyl group)-functional polyolefin prepolymer;
- from 0.1 to 5 wt % of (B) a catalyst system comprising a combination of from 75 to 85 weight percent (wt %) of zinc oxide (ZnO), from 10 to 25 wt % of titanium dioxide (TiO2), and from 2 to 10 wt % of a tin-organic ligand coordination complex (Sn Complex), wherein the sum of all wt % equals 100.00 wt %;
- and from 0 to 30 wt % of a carrier resin;
- wherein the ZnO is at least 1.0 wt %, the TiO2 is at least 0.70 wt % and the Sn Complex is at least 0.10 wt %;
- and wherein all wt % are based on total weight of the moisture-curable polyolefin formulation.
A method of making a moisture-curable polyolefin formulation, the method comprising mixing a melt of (A) a (hydrolyzable silyl group)-functional polyolefin prepolymer with (B) a catalyst system so as to give a melt-mixture comprising the melt of (A) and either the (B) or the catalyst masterbatch wherein the catalyst system comprises a combination of from 75 to 85 weight percent (wt %) of zinc oxide (ZnO), from 10 to 25 wt % of titanium dioxide (TIO2), and from 2 to 10 wt % of a tin-organic ligand coordination complex (Sn Complex), wherein the sum of all wt % equals 100.00 wt %;
- and extruding the melt-mixture so as to make the moisture-curable polyolefin formulation.
Dependencies are inferred from the claim text.