DE19961933A1 - Silica having higher density useful for production of dispersions is prepared by hydrophobising pyrogenically produced silica and compacting it - Google Patents

Silica having higher density useful for production of dispersions is prepared by hydrophobising pyrogenically produced silica and compacting it

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Publication number
DE19961933A1
DE19961933A1 DE1999161933 DE19961933A DE19961933A1 DE 19961933 A1 DE19961933 A1 DE 19961933A1 DE 1999161933 DE1999161933 DE 1999161933 DE 19961933 A DE19961933 A DE 19961933A DE 19961933 A1 DE19961933 A1 DE 19961933A1
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DE
Germany
Prior art keywords
silica
dispersions
hydrophobising
compacting
pyrogenically produced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE1999161933
Other languages
German (de)
Inventor
Guenther Michael
Volker Kasack
Ruediger Nowack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to DE1999161933 priority Critical patent/DE19961933A1/en
Priority to GB0030863A priority patent/GB2357497A/en
Priority to JP2000385876A priority patent/JP2001226113A/en
Priority to US09/740,039 priority patent/US20020037936A1/en
Publication of DE19961933A1 publication Critical patent/DE19961933A1/en
Priority to US10/623,051 priority patent/US7282236B2/en
Priority to US11/741,381 priority patent/US20070202030A1/en
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3081—Treatment with organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/10—Solid density
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/11—Powder tap density
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/20—Powder free flowing behaviour
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/90—Other properties not specified above

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

Hydorphobic, pyrogenically produced silica having a tamped density of 55 - 200 g/l is produced by hydrophobising pyrogenically produced silica and then compacting it.

Description

Die Erfindung betrifft eine hydrophobe, pyrogen hergestellte Kieselsäure, ein Verfahren zu ihrer Herstellung und ihrer Ver­ wendung.The invention relates to a hydrophobic, pyrogenically produced Silicic acid, a process for its production and its ver turn.

Es ist bekannt, hydrophile, pyrogen hergestellte Kieselsäure zu verdichten (EP 0 280 854 B1). Nachteiligerweise nimmt mit zunehmender Stampfdichte, beziehungsweise Schüttgewicht die Verdickungswirkung linear ab. Zusätzlich nimmt die Dispergier­ barkeit mit zunehmender Dichte ab. Dies zeigt sich durch eine unerwünschte Stippenbildung. Eine hydrophile, pyrogen herge­ stellte Kieselsäure kann daher nach der Verdichtung nur für eine begrenzte Anzahl von Einsatzzwecken verwendet werden.It is known to be hydrophilic, pyrogenic silica to compress (EP 0 280 854 B1). Unfortunately, takes away increasing tamped density, or bulk density Thickening effect decreases linearly. In addition, the disperser availability with increasing density. This is shown by a unwanted specks. A hydrophilic, pyrogenic herge Silica can therefore only be used for compaction a limited number of uses.

Gegenstand der Erfindung ist eine hydrophobe, pyrogen herge­ stellte Kieselsäure, welche dadurch gekennzeichnet ist, daß sie eine Stampfdichte von 55 bis 200 g/l aufweist.The invention relates to a hydrophobic, pyrogenic Herge provided silica, which is characterized in that it has a tamped density of 55 to 200 g / l.

Bevorzugt kann die Stampfdichte 60 bis 200 g/l betragen.The tamped density can preferably be 60 to 200 g / l.

Ein weiterer Gegenstand der Erfindung ist ein Verfahren zur Herstellung der hydrophoben, pyrogen hergestellten Kieselsäure mit einem Schüttgewicht von 55 bis 200 g/l, welches dadurch gekennzeichnet ist, daß man pyrogen hergestellte Kieselsäure auf bekanntem Wege hydrophobiert und anschließend verdichtet.Another object of the invention is a method for Production of the hydrophobic, pyrogenic silica with a bulk density of 55 to 200 g / l, which thereby is characterized in that pyrogenic silica hydrophobicized in a known manner and then compacted.

Bevorzugt kann die Hydrophobierung mittels halogenfreier Sila­ ne erfolgen. Der Chlorid-Gehalt der Kieselsäure kann gleich oder unter 100 ppm, bevorzugt 10 bis 100 ppm betragen.Hydrophobization by means of halogen-free sila is preferred ne done. The chloride content of the silica can be the same or below 100 ppm, preferably 10 to 100 ppm.

Die Verdichtung kann mittels eines Walzenverdichters erfolgen. Bevorzugt kann die Verdichtung mittels eines Preßbandfilters gemäß EP 0 280 851 B1 erfolgen.The compaction can be done using a roller compactor. The compression can preferably be carried out using a press belt filter according to EP 0 280 851 B1.

Als hydrophobe, pyrogen hergestellte Kieselsäure können zum Beispiel die Kieselsäuren:
Aerosil R 812 oder Aerosil R 812S, mit der Gruppierung -O-Si (CH3)3
Aerosil R 202, Aerosil MS 202, Aerosil MS 202, Aerosil R 106 oder Aerosil R 104, mit der Gruppierung
For example, as hydrophobic, pyrogenically produced silica, the silicas:
Aerosil R 812 or Aerosil R 812S, with the grouping -O-Si (CH 3 ) 3
Aerosil R 202, Aerosil MS 202, Aerosil MS 202, Aerosil R 106 or Aerosil R 104, with the grouping

Aerosil R 805 mit der Gruppierung
Aerosil R 805 with the grouping

verwendet werden.be used.

Die erfindungsgemäße hydrophobe, pyrogene Kieselsäure mit ei­ nem Stampfgewicht von 55 bis 200 g/l weist die folgenden Vor­ teile auf:
Auf Grund der höheren Stampfdichte sind die Transportkosten deutlich niedriger.The hydrophobic, pyrogenic silica according to the invention with a tamped weight of 55 to 200 g / l has the following advantages:
Due to the higher tamping density, the transport costs are significantly lower.

Nach der Dispergierung liegt die erfindungsgemäße Kieselsäure in kleineren Aggregaten vor. Das heißt: Die Dispersionen sind feinteiliger, weil die erfindungsgemäße Kieselsäure besser dispergierbar ist.After the dispersion, the silica according to the invention lies in smaller aggregates. That means: The dispersions are more finely divided because the silica according to the invention is better is dispersible.

Die mit der erfindungsgemäßen Kieselsäure hergestellten Dis­ persionen weisen einen kleineren Grindometerwert auf.The Dis produced with the silica according to the invention Persions have a smaller grindometer value.

Sowohl die Transparenz, gemessen an UV-Transmission, als auch die visuelle Durchsichtigkeit der Dispersionen werden durch die Verwendung der erfindungsgemäßen Kieselsäure deutlich ver­ bessert.Both the transparency, measured by UV transmission, as well the visual transparency of the dispersions are through the use of the silica according to the invention clearly ver improves.

Die Dispersionen, die die erfindungsgemäße Kieselsäuren ent­ halten, zeigen eine deutlich erhöhte Stabilität, weil die Se­ dimentationsneigung deutlich geringer ist.The dispersions containing the silicas according to the invention hold show a significantly increased stability because the Se tendency to dimentation is significantly lower.

Ein weiterer Vorteil der erfindungsgemäßen Kieselsäure ist die reduzierte Staubbildung bei der Einarbeitung und die deutlich herabgesetzte Einarbeitungs- beziehungsweise Benetzungszeit in zum Beispiel flüssige Systemen.Another advantage of the silica according to the invention is that reduced dust formation during incorporation and the significantly reduced familiarization or wetting time in for example liquid systems.

Die Hydrophobie ist bei der erfindungsgemäßen Kieselsäure ge­ genüber der hydrophoben, pyrogenen Kieselsäure mit niedrigerem Schüttgewicht unverändert. Auch die Verdickungswirkung ist un­ verändert.The hydrophobicity of the silica according to the invention is ge compared to the hydrophobic, pyrogenic silica with lower  Bulk weight unchanged. The thickening effect is also un changed.

Beispiel 1example 1

Es werden verschiedene hydrophobe, pyrogen hergestellte Kie­ selsäuren untersucht, wobei verschiedene Verdichtungszustände gegenübergestellt werden.There are various hydrophobic, pyrogenically produced kie investigated selic acids, different compression states be compared.

Es bedeuten:
lose = pulverförmige, unveränderte Kieselsäure
CF = mit Carterfilter verdichtete Kieselsäure
VV 60 = auf eine Stampfdichte von ca. 60 g/l verdichtete Kieselsäure
VV 90 = auf eine Stampfdichte von ca. 90 g/l verdichtete KieselsäureIt means:
loose = powdered, unchanged silica
CF = silica compressed with Carter filter
VV 60 = silica compressed to a tamped density of approx. 60 g / l
VV 90 = silica compressed to a tamped density of approx. 90 g / l

Untersucht werden die Aerosil-Typen R 202, US 202, US 204, R 812, R812S und R 805. Die Ergebnisse sind in der Tabelle 1 aufgeführt.The aerosil types R 202, US 202, US 204, R are examined 812, R812S and R 805. The results are shown in Table 1 listed.

Die Methanolbenetzbarkeit zeigt Fig. 3.The methanol wettability is shown in FIG. 3.

Der Verdichtungsgrad hat praktisch keinen nennenswerten Ein­ fluß auf die Hydrophobie, beurteilt nach der Methanolbenetz­ barkeit nach Corning Glass. Auch die Viskosität zeigt keine deutliche systematische Abhängigkeit von der Stampfdichte. Insbesondere bei R 812 wird die Dispergierbarkeit mit steigen­ der Dichte besser. R 812 S. das mehr SiOH-Gruppen enthält als R 812, zeigt obiges Phänomen weniger deutlich.The degree of compression has practically no appreciable one flow on the hydrophobicity, judged by the methanol wetting availability according to Corning Glass. The viscosity also shows none clear systematic dependence on the tamped density. With R 812 in particular, the dispersibility will also increase the density better. R 812 S. which contains more SiOH groups than R 812, shows the above phenomenon less clearly.

US 202 und US 204 sind rheologisch gut miteinander vergleich­ bar und AEROSIL R 202 unterlegen.US 202 and US 204 are rheologically well compared bar and AEROSIL R 202.

Die verdichteten Varianten zeigen überraschender Weise insbe­ sondere bei R 812, R 202 und US 202/4 eine um bis zur Hälfte verkürzte Einarbeitungszeit. Ferner zeigen die verdichteten Kieselsäuren eine geringere Staubentwicklung.
The compressed variants surprisingly show, in particular in the case of the R 812, R 202 and US 202/4, a training time which is reduced by up to half. Furthermore, the compressed silicas show less dust.

Beispiel 2 Example 2

Untersuchung des Einflusses einer höheren Verdichtung auf anwendungstechnische Eigenschaften Investigation of the influence of higher compression on application properties

1. Bestimmt an Standardmuster (UB 3391)1. Determined from standard samples (UB 3391)

Die Ergebnisse sind in den Fig. 1, 8 und 4 dargestellt Rhlogiische Prüfung:
Polymer: Araldit M
Thixmittel: R 202 und R 812
Zusatz: -The results are shown in FIGS . 1, 8 and 4.
Polymer: Araldit M
Thix: R 202 and R 812
Additive: -

Probe A R 812 10 kg 2-10123
Herstellungsdatum der Probe: 24.02.1994 Spindel:5
Sample AR 812 10 kg 2-10123
Date of manufacture of the sample: 24.02.1994 Spindle: 5

Probe A R 812 15 kg 1,0/8 min
Herstellungsdatum der Probe: 24.02.1994 Spindel:5
Sample AR 812 15 kg 1.0 / 8 min
Date of manufacture of the sample: 24.02.1994 Spindle: 5

Probe A R 812 20 kg 0,6/14 min
Herstellungsdatum der Probe: 24.02.1994 Spindel:5
Sample AR 812 20 kg 0.6 / 14 min
Date of manufacture of the sample: 24.02.1994 Spindle: 5

Die Verdichtung kann eine Art Vordispergierung darstellen. Entsprechend erhöhen sich mit der Stampfdichte die Effekti­ vitätswerte, das heißt die effektiv vorliegenden Teilchen in der Ethanoldispersion werden kleiner und die verdichte­ ten Proben setzen sich deutlich weniger ab. The compression can be a kind of predispersion. The effect increases accordingly with the tamped density vity values, i.e. the particles actually present in the ethanol dispersion the smaller and the more compact ten samples settle significantly less.  

Entsprechend ist in Araldit der Grindometerwert der ver­ dichteten Proben günstiger. Da die größeren Teilchen aber maßgeblich die Verdickungswirkung beeinflussen, geht diese mit der Verdichtung geringfügig zurück.Accordingly, the grindometer value in araldite is the ver sealed samples cheaper. Since the larger particles significantly affect the thickening effect, this goes with the compression slightly back.

Der Graphik mit den Effektivitätswerten kann man entnehmen, daß die hoch verdichtete AEROSIL R 812-Probe zwar noch mit dem Ultra-Turrax (0965), aber nicht mehr mit dem Dissolver (0955) aufgeschlossen werden kann. Aufgrund der geringeren Oberfläche von AEROSIL R 202 (und der damit prinzipiell besseren Dispergierbarkeit) tritt dieses Phänomen bei AERO- SIL R 202 kaum auf.The graphic with the effectiveness values can be seen that the highly compressed AEROSIL R 812 sample is still included the Ultra-Turrax (0965), but no longer with the dissolver (0955) can be unlocked. Because of the lesser Surface of AEROSIL R 202 (and therefore in principle better dispersibility) this phenomenon occurs with AERO- SIL R 202 barely open.

Mit steigender Verdichtung werden die effektiv vorliegenden Teilchen in einer Ethanoldispersion also kleiner und die Streuung im 90-Grad-Winkel aufgrund der Rayleigh-Streuung größer. Die Totalstreuung (über alle Winkel) wird aber kleiner, die Proben werden für das Auge deutlich transpa­ renter, was auch die UV-Transmissionsspektren belegen.With increasing compression, the effective ones become Particles in an ethanol dispersion are smaller and that Scattering at a 90 degree angle due to Rayleigh scattering greater. The total scatter (over all angles) is however smaller, the samples become clearly transparent to the eye renter, which is also proven by the UV transmission spectra.

Die Verdichtung hat keinen Einfluß auf die Hydrophbie, die mit der des Standardmusters jeweils weitgehend überein­ stimmt. The compression has no effect on the Hydrophbie, the largely corresponds to that of the standard sample Right.  

Beispiel 3 Example 3

Untersuchung des Einflusses einer höheren Verdichtung auf anwendungstechnische Eigenschaften Investigation of the influence of higher compression on application properties

Die verdichteten AEROSIL R 202-Proben verhalten sich analog zu den verdichteten AEROSIL R 812-Proben.The compressed AEROSIL R 202 samples behave analogously to the compressed AEROSIL R 812 samples.

Bezüglich der Diskussion wird daher auf Beispiel 2 verwie­ sen.With regard to the discussion, reference is therefore made to Example 2 sen.

Die Methanolbenetzbarkeit ist in der Fig. 5 graphisch dar­ gestellt.The methanol wettability is shown graphically in FIG. 5.

Claims (3)

1. Hydrophobe, pyrogen hergestellte Kieselsäure, dadurch gekennzeichnet, daß sie eine Stampfdichte von 55 bis 200 g/l aufweist.1. Hydrophobic, pyrogenic silica, characterized in that it has a tamped density of 55 to 200 g / l. 2. Verfahren zur Herstellung der hydrophoben, pyrogen her­ gestellten Kieselsäure gemäß Anspruch 1, dadurch gekenn­ zeichnet, daß man pyrogen hergestellte Kieselsäure auf bekanntem Wege hydrophobiert und anschließend verdich­ tet.2. Process for the preparation of the hydrophobic, pyrogenic provided silica according to claim 1, characterized records that one produces pyrogenic silica known hydrophobic and then compress tet. 3. Verwendung der hydrophobe, pyrogen hergestellte Kiesel­ säure gemäß Anspruch 1 zur Herstellung von Dispersionen.3. Use of the hydrophobic, pyrogenically produced pebble acid according to claim 1 for the preparation of dispersions.
DE1999161933 1999-12-22 1999-12-22 Silica having higher density useful for production of dispersions is prepared by hydrophobising pyrogenically produced silica and compacting it Ceased DE19961933A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE1999161933 DE19961933A1 (en) 1999-12-22 1999-12-22 Silica having higher density useful for production of dispersions is prepared by hydrophobising pyrogenically produced silica and compacting it
GB0030863A GB2357497A (en) 1999-12-22 2000-12-18 Hydrophobic silica
JP2000385876A JP2001226113A (en) 1999-12-22 2000-12-19 Hydrophobic silica manufactured by thermal decomposition, its manufacturing method and use thereof
US09/740,039 US20020037936A1 (en) 1999-12-22 2000-12-20 Hydrophobic silica
US10/623,051 US7282236B2 (en) 1999-12-22 2003-07-18 Hydrophobic silica
US11/741,381 US20070202030A1 (en) 1999-12-22 2007-04-27 Hydrophobic silica

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999161933 DE19961933A1 (en) 1999-12-22 1999-12-22 Silica having higher density useful for production of dispersions is prepared by hydrophobising pyrogenically produced silica and compacting it

Publications (1)

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DE19961933A1 true DE19961933A1 (en) 2001-07-26

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003054448A1 (en) * 2001-12-13 2003-07-03 Degussa Ag Method for separating ashes in combustion installations
WO2003106602A1 (en) * 2002-06-14 2003-12-24 Degussa Ag Cable gels for optical fibre cables
WO2005054390A1 (en) * 2003-12-01 2005-06-16 Degussa Ag Adhesive and sealant systems
EP1813574A1 (en) * 2006-01-25 2007-08-01 Degussa GmbH Sheet compacted pyrogenic silicon dioxide
WO2007085503A1 (en) * 2006-01-25 2007-08-02 Evonik Degussa Gmbh Process for preparation of rubber mixtures containing silicon dioxide
DE102007059862A1 (en) * 2007-12-12 2009-06-18 Evonik Degussa Gmbh Through-and-through hydrophobic slugs of pyrogenically produced silicon dioxide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010655A1 (en) * 1978-10-12 1980-05-14 Wacker-Chemie GmbH Process for increasing the bulk density of silicon dioxide and a use of the so treated silicon dioxide
EP0280851B1 (en) * 1987-02-26 1991-04-24 Degussa Aktiengesellschaft Process for compressing pyrogenic silica

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010655A1 (en) * 1978-10-12 1980-05-14 Wacker-Chemie GmbH Process for increasing the bulk density of silicon dioxide and a use of the so treated silicon dioxide
EP0280851B1 (en) * 1987-02-26 1991-04-24 Degussa Aktiengesellschaft Process for compressing pyrogenic silica

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003054448A1 (en) * 2001-12-13 2003-07-03 Degussa Ag Method for separating ashes in combustion installations
WO2003106602A1 (en) * 2002-06-14 2003-12-24 Degussa Ag Cable gels for optical fibre cables
DE10226520A1 (en) * 2002-06-14 2004-01-08 Degussa Ag cable gels
US7095929B2 (en) 2002-06-14 2006-08-22 Degussa Ag Cable gels for optical fibre cables
WO2005054390A1 (en) * 2003-12-01 2005-06-16 Degussa Ag Adhesive and sealant systems
US8022130B2 (en) 2003-12-01 2011-09-20 Evonik Degussa Gmbh Adhesive and sealant systems
EP1813574A1 (en) * 2006-01-25 2007-08-01 Degussa GmbH Sheet compacted pyrogenic silicon dioxide
WO2007085503A1 (en) * 2006-01-25 2007-08-02 Evonik Degussa Gmbh Process for preparation of rubber mixtures containing silicon dioxide
WO2007085511A1 (en) * 2006-01-25 2007-08-02 Evonik Degussa Gmbh Pyrogenically prepared silicon dioxide compacted to give crusts
US7842269B2 (en) 2006-01-25 2010-11-30 Evonik Degussa Gmbh Pyrogenically prepared silicon dioxide compacted to give crusts
US8252853B2 (en) 2006-01-25 2012-08-28 Evonik Degussa Gmbh Process for preparation of rubber mixtures containing silicon dioxide
DE102007059862A1 (en) * 2007-12-12 2009-06-18 Evonik Degussa Gmbh Through-and-through hydrophobic slugs of pyrogenically produced silicon dioxide

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Owner name: DEGUSSA GMBH, 40474 DUESSELDORF, DE

8127 New person/name/address of the applicant

Owner name: EVONIK DEGUSSA GMBH, 40474 DUESSELDORF, DE

R002 Refusal decision in examination/registration proceedings
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Effective date: 20121221