Processibility and lacing resistance when silanized pigments are incorporated in polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsPatricia A. Tooley, Dwight A. Holtzen, Joseph A. Musiano
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Abstract
White-pigmented polymers (particularly, polyolefins such as polyethylene) containing white pigments treated with at least one silane or a mixture of at least one silane and at least one polysiloxane are disclosed to improve processibility in compounding and improve performance properties such as lacing resistance in a polymeric matrix.
Claims4
A process for preparing a polyethylene composition consisting essentially of TiO.sub.2 pigment, comprising the steps of:
- (a) coating TiO.sub.2 pigment with at least one organosilicon 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 coated TiO.sub.2 pigment;
- and
- (b) mixing the coated TiO.sub.2 pigment with a polyethylene matrix at a concentration of about 50 to about 87% by weight of coated TiO.sub.2 pigment based on the weight of the polyethylene matrix to form a polyethylene composition consisting essentially of TiO.sub.2 pigment.
A process for preparing a polyethylene composition consisting essentially of TiO.sub.2 pigment, comprising the steps of:
- (i) coating TiO.sub.2 pigment with an organosilicon compound comprising a mixture of (a) and (b), wherein
- (a) is at least one silane 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) is at least one polysiloxane having the formula:
- ##EQU2## wherein, R is an organic or inorganic group;
- n=0-3;
- and
- m>2;
- to form coated TiO.sub.2 pigment;
- and
- (ii) mixing the coated TiO.sub.2 pigment with a polyethylene matrix at a concentration of about 50 to about 87% by weight of coated TiO.sub.2 pigment based on the weight of the polyethylene matrix to form a polyethylene composition consisting essentially of TiO.sub.2 pigment.
Dependencies are inferred from the claim text.