Granted Patent B2

US 12,344,727 · App. 16/965,987 · Granted Jul 1, 2025

Inventors: Thomas Chaussee (Cailloux-sur-Fontaines, FR); Frédéric Magnin-Feysot (Saint Pierre de Chandieu, FR); Hélène Fay (Bordeaux, FR); Loïc Baussaron (Serpaize, FR); Jean-Claude Le Thiesse (Plouhinec, FR)

Assignee: RHODIA OPERATIONS

C08K3/36C01B33/145C08J3/215C09C1/3018C01P2004/62C01P2006/22C08K2201/005

Abstract

Claims (24)

1. A suspension of silica particles comprising:

a liquid [liquid (L)] selected from the group consisting of the linear or branched, saturated or unsaturated, aliphatic and cycloaliphatic hydrocarbons having from 6 to 30 carbon atoms and of the aromatic hydrocarbons having from 6 to 10 carbon atoms,

silica particles, wherein the silica particles are precipitated silica particles, and

at least one compound [compound (S)] selected from the group consisting of:

the acid phosphate esters of formula (I)

P(O)((OCH 2 CH 2 ) n OR) a (OM) b   (I)

wherein:

R represents a linear or branched, saturated or unsaturated, aliphatic hydrocarbon group having from 1 to 24 carbon atoms or an aromatic hydrocarbon having from 6 to 24 carbon atoms; M is H, Na or K, n is an integer from 4 to 8;

a is an integer equal to 1 or 2, and b is 3-a;

characterised in that said compound(S) is miscible in liquid (L) in the temperature range from 20° C. to 50° C.

2. The suspension according to claim 1 wherein the silica particles are characterized with a particle size of less than 600 nm as measured by dynamic light scattering.

3. The suspension according to claim 1 wherein the silica particles are present in an amount of from 1 to 60% by weight with respect to the total weight of the suspension.

4. The suspension according to claim 1 wherein liquid (L), is selected from the group consisting of n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-dodecane, n-hexadecane, and cyclohexane.

5. The suspension according to claim 1 wherein compound(S) is present in an amount of from 5 to 50% by weight with respect to the dry weight of the silica particles.

6. The suspension according to claim 1 wherein compound(S) is such that the viscosity, measured at room temperature, of suspensions comprising n-hexadecane, silica particles in an amount of 20% by weight with respect to the total weight of the suspension, and compound(S) in a compound(S) to silica ratio in the range from 30 to 60% by weight is less than 100 mPa·s.

7. The suspension according to claim 1 wherein compound(S) is such that the viscosity, measured at room temperature, of suspensions comprising o-xylene, silica particles in an amount of 20% by weight with respect to the total weight of the suspension, and compound(S) in a compound(S) to silica ratio in the range from 30 to 60% by weight is less than 50 mPa·s.

8. A process for the preparation of the suspension of claim 1 comprising milling the precipitated silica in the presence of liquid (L) and of at least one compound(S) in a wet milling apparatus.

9. The process of claim 8 which comprises the following steps:

i. providing a solution of at least one compound (S) in liquid (L),

ii. adding the precipitated silica; and

iii. milling in a wet milling apparatus.

10. A composition comprising the suspension of claim 1 and at least one polymer.

11. A method for the preparation of the composition of claim 10 comprising mixing the suspension of claim 1 with a solution or suspension of the polymer in an organic liquid.

12. A composition comprising the suspension of claim 1 and at least one polymerizable monomer.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (41)