Claims
- 1. A process for preparing a suspension of a particulate filler in a material, wherein said material is prepared from a silicone oil comprising:polyorganosiloxanes (POS fluids) of type (I) which carry Si-alkenyl functional groups capable of reacting with the Si—H crosslinking functional groups of a POS fluid of type II, optionally, POS fluids of type (II) which carry Si—H crosslinking functional groups capable of reacting with the Si-alkenyl functional groups of the POS fluids (I), and/or, optionally, POS fluids of type (III) which differ from the POS fluids (I) and (II), said suspension being able to be used for producing silicone compositions that can be cured by polyaddition, and wherein said particulate filler is treated with a compatibilizer; said process comprising, forming a preparation mixture of the particulate filler and the silicone oil, and introducing compatibilizer into the preparation mixture either: before and/or simultaneously with the contacting of at least part of the silicone oil employed with at least part of the particulate filler used, this introduction of compatibilizer taking place in one or more steps or, after the contacting of at least part of the silicone oil employed with at least part of the particulate filler used; and wherein: all or some of the silicone oil, water and all or some of the particulate filler are mixed with a first compatibilizer fraction of between 1 and 3% by dry weight with respect to the filler, a second compatibilizer fraction, representing between 10 and 15% by dry weight of filler, is incorporated into the mixture, optionally, the rest of the silicone oil and the rest of the are added, the mixture is allowed to react, the mixture is devolatilized, optionally, the devolatilized mixture is allowed to cool, and optionally, the suspension is completed with the rest of the silicone oil.
- 2. The process according to claim 1, wherein:a mixture comprising the silicone oil, the water and the first compatibilizer fraction is homogenized, the particulate filler is gradually added to the mixture obtained, mixing is continued, the second compatibilizer fraction is gradually incorporated into the mixture obtained from the previous step, mixing is continued, and the mixture is devolatilized.
- 3. The process according to claim 1, wherein;the silicone oil and the water are homogenized, the particulate filler and, at the same time, the first compatibilizer fraction are gradually incorporated into the mixture obtained from the previous step, mixing is continued, the second compatibilizer fraction is gradually incorporated into the mixture obtained from the previous step, mixing is continued, and the mixture is devolatilized.
- 4. The process according to claim 1, wherein:the silicone oil is introduced, the particulate filler together with the first compatibilizer fraction and the water are gradually and simultaneously incorporated into the silicone oil, mixing is continued, the second compatibilizer fraction is gradually incorporated into the mixture obtained from the previous step, mixing is continued, and the mixture is devolatilized.
- 5. The process according to claim 1, wherein said particulate filler is silica.
Priority Claims (1)
Number |
Date |
Country |
Kind |
97 08171 |
Jun 1997 |
FR |
|
Parent Case Info
This application was a national stage filing under 35 U.S.C. §371 of International Application No. PCT/FR98/01319 filed on Jun. 23, 1998, which International Application was published by the International Bureau in English on Dec. 30, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/FR98/01319 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/58997 |
12/30/1998 |
WO |
A |
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 462 032 |
Mar 1987 |
EP |
0 669 376 |
Aug 1995 |
EP |
2 320 324 |
May 1994 |
FR |