Modified silane treated pigments or fillers and compositions containing the same
View Patent ↗The present invention is directed to a composition comprising a white pigment or extended white pigment surface treated with a silane having at least one functional group capable of reacting with acids and anhydrides, at least one polymeric material and a compatibilizer. Once treated, the pigment has improved processability and dispersibility in polymeric materials. Silanizing the pigment also enhances the brightness (increase whiteness and reduce yellowness) of the pigment.
1. A composition comprising:
a) a white pigment or extended white pigment surface treated with a silane having at least one functional group capable of reacting with acids and anhydrides:
b) at least one polymeric material; and,
c) a compatibilizer, said compatibilizer comprising copolymer of ethylene or propylene with anhydride or acid groups which are capable of reacting with the functional groups of the at least one polymeric material.
2. The composition of claim 1 wherein said silane has the following general formula:
R x Si(R′) 4-x
wherein
R is a nonhydrolyzable functional group directly or indirectly bonded to the silicon atom selected from the group consisting of epoxy, isocyanato, mercapto, and mixtures thereof;
R′ is a hydrolyzable group selected from the group consisting of alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
x=1 to 3.
3. The composition of claim 1 wherein said pigment is TiO 2 .
4. The composition of claim 1 wherein said extended white pigment is selected from clays, inorganic metal compounds and siliceous materials.
5. The A composition comprising:
a) a white pigment or extended white pigment surface treated with a silane having at least one functional group capable of reacting with acids and anhydrides;
b) at least one polymeric material; and,
c) a compatibilizer, said compatibilizer comprising copolymer selected from the group consisting of ethylene maleic anhydride copolymers, ethylene (meth)acrylic acid copolymers, propylene maleic anhydride copolymers, propylene acrylic acid copolymers, ethylene propylene copolymers with maleic anhydride or acid functional groups, and olefinic ionomer resins.
6. The composition of claim 1 wherein said compatibilizer is present at a concentration of about 0.5 wt. % to about 20 wt. % based on a total weight of the composition.
7. The composition of claim 1 wherein said compatibilizer is present at a concentration of about 1% to about 10% by weight of the total composition.
8. The composition of claim 1 wherein said filler or pigment is present at a concentration of about 40 wt. % to about 85 wt. % based on a total weight of the composition.
9. The composition of claim 1 further comprising at least one lubricant selected from the group consisting of polysiloxanes, silicone fluids, stearates, paraffinic oils, fluorocarbon fluids, and mixtures thereof.
10. The composition of claim 9 wherein said lubricant is a polysiloxane selected from the group consisting of polydimethylsiloxane and organomodified polydimethylsiloxane.
11. The composition of claim 9 wherein said lubricant is present from about 0.5 wt. % to about to about 5 wt. % based on a total weight of the composition.
12. The composition of claim 1 wherein said silane is present on the surface of said pigment or extended white pigment in an amount of about 0.1 wt. % to about 5 wt. % based on a weight of said pigment or extended white pigment.
13. The composition of claim 1 wherein said polymeric material is selected from the group consisting of olefins and alphaolefins and their copolymers and terpolymers, rubbery block copolymers, polyamides, polyesters, vinylic polymers, acrylics, epoxies, ionomeric resins, and mixtures thereof.
14. The composition of claim 13 wherein said polymeric material is selected from the group consisting of polyethylene, ethylene copolymers, polypropylene, propylene copolymers, and mixtures thereof.
15. The composition of claim 5 wherein said silane has the following general formula:
R x Si(R′) 4-x
wherein
R is a nonhydrolyzable functional group directly or indirectly bonded to the silicon atom selected from the group consisting of epoxy, isocyanato, mercapto, and mixtures thereof;
R′ is a hydrolyzable group selected from the group consisting of alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
x=1 to 3.
16. The composition of claim 5 wherein said pigment is TiO 2 .
17. The composition of claim 5 wherein said extended white pigment is selected from clays, inorganic metal compounds and siliceous materials.
18. The composition of claim 5 wherein said extended white pigment is selected from clays, inorganic metal compounds and siliceous materials.
19. The composition of claim 5 wherein said compatibilizer is present at a concentration of about 0.5 wt. % to about 20 wt. % based on a total weight of the composition.
20. The composition of claim 5 wherein said compatibilizer is present at a concentration of about 1% to about 10% by weight of the total composition.
21. The composition of claim 5 wherein said filler or pigment is present at a concentration of about 40 wt. % to about 85 wt. % based on a total weight of the composition.
22. The composition of claim 5 further comprising at least one lubricant selected from the group consisting of polysiloxanes, silicone fluids, stearates, paraffinic oils, fluorocarbon fluids, and mixtures thereof.
23. The composition of claim 22 wherein said lubricant is a polysiloxane selected from the group consisting of polydimethylsiloxane and organomodified polydimethylsiloxane.
24. The composition of claim 22 wherein said lubricant is present from about 0.05 wt. % to about to about 5 wt. % based on a total weight of the composition.
25. The composition of claim 5 wherein said silane is present on the surface of said pigment or extended white pigment in an amount of about 0.1 wt. % to about 5 wt. % based on a weight of said pigment or extended white pigment.
26. The composition of claim 5 wherein said polymeric is selected from the group consisting of olefins and alphaolefins and their copolymers and terpolymers, rubbery block copolymers, polyamides, polyesters, vinylic polymers, acrylics, epoxies, ionomeric resins, and mixtures thereof.
27. The composition of claim 26 wherein said polymeric material is selected from the group consisting of polyethylene, ethylene copolymers, polypropylene, propylene copolymers, and mixtures thereof.