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US4289681A Expired / Lapsed US ⏱️ 0.0 years remaining

Boron containing precipitated silica

Assignee: Evonik Operations GmbH
•
Filing: 1979-06-28
•
Granted: 1981-09-15
•
Expires: 1999-06-28
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Abstract

Abstract There is prepared precipitated silica containing boron and having the following physical-chemical data ______________________________________ Loss on heating Weight % 14-40 pH 4-6 Conductivity in 4% aqueous /μS <800 dispersion Bulk density g/l 130 ± 100 Sieve residue according to Alpine >63/μ Weight % <0.1 SiO 2 content based on original Weight % 9-76 material B 2 O 3 content based on original Weight % 10-51 material Na 2 O content based on original Weight % <0.5 material So 3 content based on original Weight % <0.8 material ______________________________________ The product is obtained by supplying precipitated silica and ortho boric acid in the ratio of 0.1-3.5:1 continuously to a jet mill and micronizing them together by means of the air of the mill at room temperature.

Inventors

  • 👤 Peter Nauroth
  • 👤 Robert Kuhlmann
  • 👤 Gunter Turk

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 05:54
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; A; A01; A01N; A01N59/00; A01N59/14; C08; C08K; C08K3/00; C08K3/38; C09C3/00; C09C3/04; C09C3/041; C09C3/06; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2006/00; C01P2006/10

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 79 words
A boron containing precipitated silica having the following physical-chemical data ______________________________________ Loss on heating Weight % 14-40 pH 4-6 Conductivity in 4% aqueous μS <800 dispersion Bulk density g/l 130 ± 100 Sieve residue according to Weight % 0.1 Alpine >63μ SiO.sub.2 content based on original Weight % 9-76 material B.sub.2 O.sub.3 content based on original Weight % 10-51 material Na.sub.2 O content based on original Weight % <0.5 SO.sub.3 content based on original Weight % <0.8 material ______________________________________
Claim 2
Dependent Claim 79 words
A boron containing precipitated silica having the following physical-chemical data ______________________________________ Loss on heating Weight % 14-40 pH 4-6 Conductivity in 4% aqueous μS <800 dispersion Bulk density g/l 130 ± 100 Sieve residue according to Weight % 0.1 Alpine >63μ SiO.sub.2 content based on original Weight % 9-76 material B.sub.2 O.sub.3 content based on original Weight % 10-51 material Na.sub.2 O content based on original Weight % <0.5 SO.sub.3 content based on original Weight % <0.8 material ______________________________________
Claim 3
Dependent Claim 18 words
A precipitated silica according to claim 1 containing 25-51% B 2 O 3 based on the original material.
Claim 4
Dependent Claim 18 words
A precipitated silica according to claim 2 containing 28.1-51% B 2 O 3 based on the original material.
Claim 5
Dependent Claim 28 words
A precipitated silica according to claim 1 wherein the weight ratio of SiO 2 to B 2 O 3 is from 45.7 to 28.1 to 9.15 to 50.65.
Claim 6
Dependent Claim 51 words
A process for the production of the boron containing precipitated silica of claim 1 comprising supplying precipitated silica and ortho boric acid in the ratio of 0.1 to 3.5:1 continuously to a jet mill and micronizing the silica and boric acid together by means of grinding air at about room temperature.
Claim 7
Dependent Claim 21 words
A process according to claim 5 wherein the precipitated silica employed has a BET surface area of 100-700 m 2 /g.
Claim 8
Dependent Claim 14 words
A process according to claim 5 wherein there is employed unground, spray dried silica.
Claim 9
Dependent Claim 14 words
A process according to claim 5 wherein there is employed unground silica furnace granulate.
Claim 10
Dependent Claim 18 words
A process according to claim 5 where there is employed as the boron containing component ortho boric acid.
Claim 11
Dependent Claim 18 words
A process according to claim 5 wherein there is employed as the boron containing component meta boric acid.
Claim 12
Dependent Claim 19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 1.
Claim 13
Dependent Claim 12 words
A composition according to claim 11 wherein the polysiloxane is dimethyl polysiloxane.
Claim 14
Dependent Claim 19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 2.
Claim 15
Dependent Claim 19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 3.

References Cited (Backward Citations)

DE1154270B Cited
US3622650A Cited
DE2122066C3 Cited
DE2716225A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-09-14 1985-03-16 1985-09-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-09-14 1989-03-16 1989-09-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-09-14 1993-03-16 1993-09-15 $7700.00 Window Closed / Lapsed

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