§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4405490A Expired / Lapsed US ⏱️ 0.0 years remaining

Anti-foam formulation containing an organopolysiloxane

Assignee: Bayer AG
•
Filing: 1981-03-30
•
Granted: 1983-09-20
•
Expires: 2001-03-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An anti-foam composition comprising (a) a dispersion of a silicon dioxide filler in an organopolysiloxane, (b) an emulsifier or dispersant, and (c) at least one water soluble compound selected from the group consisting of (i) a divalent aliphatic alcohol containing 4 to 10 carbon atoms, (ii) a trivalent aliphatic alcohol containing 2 to 10 carbon atoms, and ##STR1## in which R 1 and R 2 each independently is hydrogen, C 1-8 -alkyl or C 1-8 -alkyl-CO-, and n,m,p and r are so chosen that the molecular weight of (c) does not exceed 499. Advantageously, based upon (a) plus (b) plus (c) the composition by weight comprises about 25 to 35% (a), about 8 to 12% (b) and about 53 to 67% (c), the composition additionally containing water in up to about 45% by weight of the entire composition. The composition is more readily water-dispersible and of better anti-foaming action than heretofore.

Inventors

  • 👤 Joachim Maas
  • 👤 Helmut Steinberger
  • 👤 Hans-Heinrich Moretto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 05:00
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 108 words
An anti-foam composition comprising by weight approximately (a) 10 to 40% of a dispersion of a silicon dioxide filler in an organopolysiloxane, (b) 6 to 15% of an emulsifier or dispersant, and (c) 45 to 84% of at least one water soluble compound selected from the group consisting of (i) a divalent aliphatic alcohol containing 4 to 10 carbon atoms, (ii) a trivalent aliphatic alcohol containing 2 to 10 carbon atoms, and ##STR7## in which R 1 and R 2 each independently is hydrogen, C 1-8 -alkyl or C 1-8 -alkyl-CO-, and n,m,p,o and r are so chosen that the molecular weight of (c) does not exceed 425.
Claim 2
Dependent Claim 108 words
An anti-foam composition comprising by weight approximately (a) 10 to 40% of a dispersion of a silicon dioxide filler in an organopolysiloxane, (b) 6 to 15% of an emulsifier or dispersant, and (c) 45 to 84% of at least one water soluble compound selected from the group consisting of (i) a divalent aliphatic alcohol containing 4 to 10 carbon atoms, (ii) a trivalent aliphatic alcohol containing 2 to 10 carbon atoms, and ##STR7## in which R 1 and R 2 each independently is hydrogen, C 1-8 -alkyl or C 1-8 -alkyl-CO-, and n,m,p,o and r are so chosen that the molecular weight of (c) does not exceed 425.
Claim 3
Dependent Claim 14 words
A composition according to claim 1, wherein the water-soluble compound (c) comprises polypropylene glycol.
Claim 4
Dependent Claim 14 words
A composition according to claim 1, wherein the water-soluble compound (c) comprises tripropylene glycol.
Claim 5
Dependent Claim 65 words
A composition according to claim 1, wherein (a) comprises about 1 to 15% by weight of silica, and at least one organopolysiloxane of the formula ##STR8## having a viscosity of about 20 to 70,000 mPas at 25° C. and wherein R each independently is OH, halogen or an optionally halogenated monovalent hydrocarbon radical, and a is a number which suffices to give the indicated viscosity.
Claim 6
Dependent Claim 20 words
A composition according to claim 1, additionally containing water in up to about 70% by weight of the total composition.
Claim 7
Dependent Claim 51 words
A composition according to claim 4, wherein based on (a) plus (b) plus (c) the composition by weight comprises about 25 to 35% (a), about 8 to 12% (b) and about 53 to 67% (c), the composition additionally containing water in up to about 45% by weight of the entire composition.

References Cited (Backward Citations)

US3250727A Cited
DE1419678A1 Cited
GB1224026A Cited
GB1315910A Cited
US3784479A Cited
GB1348751A Cited
US4052331A Cited
GB1505665A Cited
US4274977A Cited
DE2829906C2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-09-19 1987-03-21 1987-09-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-09-19 1991-03-21 1991-09-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-09-19 1995-03-21 1995-09-20 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag