Claims
- 1. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) adding a silane compound to a slurry comprising TiO.sub.2 pigment and water, the silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 8-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3;
- to form silanized TiO.sub.2 pigment; and
- (b) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
- 2. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) silanizing TiO.sub.2 pigment in a slurry comprising TiO.sub.2 pigment and water by treating TiO.sub.2 pigment with a mixture of a silane compound and a polysiloxane compound, the silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 1-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3;
- and
- (b) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
- 3. The process of claim 2, wherein the polysiloxane compound has the formula:
- (R.sub.n SiO.sub.4-n/2).sub.m
- wherein,
- R is an organic or inorganic group;
- n=0-3; and
- m.gtoreq.2.
- 4. The process of claim 1 or 2, wherein the highly loaded polymer concentrate comprises about 70 to about 87% by weight silanized TiO.sub.2 pigment.
- 5. The process of claim 4, wherein the polymer resin is polyethylene.
- 6. The process of claim 1 or 2, wherein the silane compound is octyltriethoxysilane.
- 7. The process of claim 1 or 2, wherein the silane compound is octyltrichlorosilane.
- 8. The process of claim 1 or 2, wherein R is an aliphatic having 8-18 carbons, R' is methoxy, ethoxy, chloro, hydroxy, or mixtures thereof, and x=1 to 3.
- 9. The process of claim 8, wherein R is an aliphatic having 8 carbons, R' is ethoxy, hydroxy, or mixtures thereof, and x=1 to 3.
- 10. The process of claim 8, wherein R is an aliphatic having 8 carbons, R' is chloro, hydroxy, or mixtures thereof, and x=1 to 3.
- 11. The process of claim 2, wherein R is an aliphatic having 1-8 carbons, R' is methoxy, ethoxy, chloro, hydroxy, or mixtures thereof, and x=1 to 3.
- 12. The process of claim 11, wherein R is an aliphatic having 1-8 carbons, R' is ethoxy, hydroxy, or mixtures thereof, and x=1 to 3.
- 13. The process of claim 11, wherein R is an aliphatic having 1-8 carbons, R' is chloro, hydroxy, or mixtures thereof, and x=1 to 3.
- 14. The process of claim 13, wherein R is an aliphatic having 6-8 carbons, R' is chloro, hydroxy, or mixtures thereof, and x=1 to 3.
- 15. The process of claim 2 or 3, wherein the polysiloxane is selected from the group consisting of polydimethylsiloxane, vinyl phenylmethyl terminated dimethyl siloxane, divinylmethyl terminated polydimethyl siloxane, and mixtures thereof.
- 16. The process of claim 1 or 2, wherein the polymer resin is selected from the group consisting of polyolefins, polyesters, polyvinyl chlorides and polystyrenes.
- 17. The process of claim 16, wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and polybutylene.
- 18. The process of claim 17, wherein the polyolefin is polyethylene.
- 19. The process of claim 1 or 2, wherein the TiO.sub.2 pigment is silanized with about 0.1 to about 5.0% by weight of the silane compound based on the weight of silanized TiO.sub.2 pigment.
- 20. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) treating TiO.sub.2 pigment with a silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 8-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3
- to form silanized TiO.sub.2 pigment; and
- (b) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
- 21. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) drying TiO.sub.2 pigment and adding to the pigment during drying a silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 8-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3;
- to form silanized TiO.sub.2 pigment; and
- (b) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
- 22. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) mixing a silane compound with water, the silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 8-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3;
- (b) treating TiO.sub.2 pigment with one or more compounds resulting from mixing the silane compound and water in step (a) to form silanized TiO.sub.2 pigment; and
- (c) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
- 23. A process for silanizing TiO.sub.2 pigment and for highly loading the silanized TiO.sub.2 pigment in a polymer concentrate, comprising the steps of:
- (a) treating TiO.sub.2 pigment with the reaction products or water and a silane compound having the formula:
- R.sub.x Si(R').sub.4-x
- wherein,
- R is a nonhydrolyzable aliphatic, cycloaliphatic or aromatic group having 8-20 carbon atoms;
- R' is a hydrolyzable group selected from alkoxy, halogen, acetoxy or hydroxy or mixtures thereof; and
- x=1 to 3
- to form silanized TiO.sub.2 pigment; and
- (b) mixing the silanized TiO.sub.2 pigment with a polymer resin to form a highly loaded polymer concentrate comprising about 50 to about 87% by weight silanized TiO.sub.2 pigment.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 08/477,754 filed on Jun. 7, 1995, now U.S. Pat. No. 5,631,310 which is a divisional of application Ser. No. 08/203,108 filed Feb. 28, 1994 now U.S. Pat. No. 5,607,994.
US Referenced Citations (39)
Foreign Referenced Citations (4)
Number |
Date |
Country |
88180-A |
Nov 1991 |
AUX |
88180 |
Jun 1992 |
AUX |
0 523 654 A1 |
Jan 1903 |
EPX |
0389 266 A1 |
Sep 1990 |
EPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
203108 |
Feb 1994 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
477754 |
Jun 1995 |
|