Method for preparing precipitated silicas, novel precipitated silicas and their uses, in particular for strengthening polymers

Patent metadata

Field	Value
Publication number	US-10894872-B2
Application number	US-201314424385-A
Country	US
Kind code	B2
Filing date	Sep 2, 2013
Priority date	Aug 31, 2012
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

It also relates to novel precipitated silicas and to their uses.

First claim

The invention claimed is:

1. A tire comprising a precipitated silica having:
a BET specific surface of between 45 and 550 m 2 /g,
a content (C) of polycarboxylic acid and corresponding carboxylate, expressed as total carbon, of at least 0.15% by weight, wherein the polycarboxylic acid comprises succinic acid, and
an aluminum (Al) content of at least 0.20% by weight,

wherein the precipitated silica exhibits a dispersive component of the surface energy γ s d of at least 40 mJ/m 2 and of less than 43 mJ/m 2 .

2. The tire as claimed in claim 1 , wherein the BET specific surface is between 100 and 240 m 2 /g.

3. The tire as claimed in claim 1 , wherein the content (C) of polycarboxylic acid and corresponding carboxylate, expressed as total carbon, is at least 0.25% by weight.

4. The tire as claimed in claim 1 , wherein the aluminum (Al) content is at least 0.30% by weight.

5. The tire as claimed in claim 1 , wherein the precipitated silica exhibits a dispersive component of the surface energy γ s d of less than 42 mJ/m 2 .

6. The tire as claimed in claim 1 , wherein the precipitated silica exhibits a water uptake of greater than 6%.

7. The tire as claimed in claim 1 , wherein the precipitated silica exhibits a ratio (R), defined by the following formula:

(
R
)

=

N
×

[

(

100
×

C
/

C
Theo

)

×

M
Al

]

(

Al
×

M
Ac

)

,

in which:
N is the number of carboxylic functional groups of the polycarboxylic acid,
C T is the carbon content of the polycarboxylic acid,
M Al is the molecular weight of aluminum,
M Ac is the molecular weight of the polycarboxylic acid,

of between 0.4 and 3.5.

8. The tire as claimed in claim 7 , wherein the ratio (R) exhibited by the precipitated silica is between 0.5 and 2.5.

Assignees

• Rhodia Operations

Inventors

• Boivin Cédric
• Guy Laurent
• Perin Eric
• Lamiri Kilani

Classifications

• C09C3/08

  Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C09C3/06

  Treatment with inorganic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C09C1/3063

  Treatment with low-molecular organic compounds · CPC title

• C09C1/3045

  Treatment with inorganic compounds · CPC title

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title