Golf ball having at least one layer consisting of a mixture of a thermoset or thermoplastic composition and a plurality of alkoxylated siloxane-surface treated particles and/or polyether-modified siloxane-surface treated particles

1. A golf ball having a CoR of at least 0.700 and an Atti compression of at least about 50 and comprising at least one layer comprising a mixture of a polyurethane composition and a plurality of titanium dioxide particulates, wherein at least a portion of the plurality is surface-treated with alkoxylated siloxanes, polyether-modified siloxanes, or combinations thereof;

wherein the plurality of titanium dioxide particulates is included in the mixture in an amount such that the cover layer has a specific gravity of from 0.5 to about 5.0 and greater than a specific gravity of the polyurethane composition; and

wherein the plurality of titanium dioxide particulates creates a specific gravity gradient within the cover layer.

2. The golf ball of claim 1 , wherein at least a portion of the plurality of particulates are contacted with at least one compound having the formula

wherein: R identically or differently is R 1 , methyl or hydroxyl; R 1 is identically or differently a polyether moiety of formula —Z—(O—C m H 2m -(n−1)) o -[O-(AO)—R 3 ] n ;

wherein: Z is a branched alkylene moiety or an unbranched alkylene moiety having from 2 to 4 carbon atoms; m is from 2 to 4; n is from 1 to 3; o is 0 or 1; AO identically or differently is an oxyalkylene moiety comprising an oxyethylene moiety, an oxypropylene moiety, and/or an oxybutylene moiety moieties; R 3 identically or differently is hydrogen or an alkyl moiety having from 1 to 4 carbon atoms; and in R 1 a total number of carbon atoms and oxygen atoms is at least 70; a is from 20 to 200; and b is from 1 to 50; and wherein if none of moieties R is R 1 , then b is at least 3; and

wherein the compound of the formula (I) is included in an amount of 0.01 to 2% by weight based on the total weight of the portion of particles contacted with the compound.

3. The golf ball of claim 2 , wherein 100 wt % of the plurality of titanium dioxide particulates is contacted with the compound.

4. The golf ball of claim 2 , wherein 50 wt % or greater of the plurality of titanium dioxide particulates is contacted with the compound.

5. The golf ball of claim 2 , wherein less than 50 wt % of the plurality of titanium dioxide particulates is contacted with the compound.

6. The golf ball of claim 1 , wherein the plurality of titanium dioxide particulates is included in the mixture in an amount of up to about 25 wt % of the total weight of the mixture.

7. The golf ball of claim 1 , wherein the plurality of titanium dioxide particulates is included in the mixture in an amount of greater than 10 wt % of the total weight of the mixture.

8. The golf ball of claim 1 , wherein the mixture has a tensile strength of from about 300 psi to about 50,000 psi and greater than a tensile strength of the polyurethane composition.

9. The golf ball of claim 8 , wherein the mixture has an elongation at break of from about 20% to about 1000% and greater than an elongation at break of the polyurethane composition.

10. The golf ball of claim 1 , wherein the at least one layer has an MVTR that is less than an MVTR of an adjacent inner layer consisting of the polyurethane composition.

11. The golf ball of claim 1 , wherein the golf ball has a moment of inertia of from about 70 g·cm 2 to about 95 g·cm 2 .

12. The golf ball of claim 1 , wherein the polyurethane composition comprises a polyurethane foam.