ANTIFOAM COMPOSITION

• US 3,846,329 A
• Filed: 04/09/1973
• Issued: 11/05/1974
• Est. Priority Date: 05/17/1971
• Status: Expired due to Term

• Current Assignee: Kermit W. Householder, Van I. Doesburg
• Original Assignee: Kermit W. Householder, Van I. Doesburg
• Inventors: Householder, Kermit W., Doesburg, Van I.
• Primary Examiner(s): Lovering, Richard D.
• Application Number:
  US05/349,606
• Time in Patent Office: 575 Days
• Field of Search: 252/358
• US Class Current: 516/124
• CPC Class Codes: B01D 19/0404 characterised by the nature of the chemical substance
• CPC Class Codes: B01D 19/0409 compounds containing Si-atoms
• CPC Class Codes: C08C 1/04 Purifying; Deproteinising
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/12 containing polyether sequences

Abstract

An antifoam composition which consists essentially of (1) 5 to 50 percent by weight of a silicone-glycol copolymer, (2) 5 to 50 percent by weight of a polypropylene glycol, (3) 5 to 50 percent by weight of a glycol copolymer, and (4) 40 to 85 percent by weight of water is disclosed. This composition is particularly useful in latexes.

Claims

1. AN ANTIFOAM COMPOSITION WHICH CONSISTS ESSENTIALLY OF 1.5 TO 50 PERCENT BY WEIGHT OF A SILICONE-GLYCOL COPOLYMER HAVING THE GENERAL FORMULA (CH3)SIO)(CH3)2SIO)R((CH3)GSIO)YSI(CH3)3 WHEREIN X HAS AN AVERAGE VALUE FROM 6 TO 420, Y HAS AN AVERAGE VALUE FROM 3 TO 30, AND G IS A RADICAL OF THE STRUCTURE -D(OR)2A WHEREIN D IS AN ALKYLENE RADICAL CONTAINING FROM 1 TO 30 CARBON ATOMS, R IS COMPOSED OF ETHYLENE RADICALS AND RADICALS SELECTED FROM THE GROUP CONSISTING OF POPYLENE AND BUTYLENE RADICALS, THE AMOUNT OF ETHYLENE RADICALS RELATIVE TO THE OTHER ALKYLENE RADICALS BEING SUCH THAT THE RATIO OF CARBON ATOMS TO OXYGEN ATOMS IN THE TOTAL OR BLOCK RANGES FRON 2.3:

1 TO 2.;

1, Z HAS AN AVERAGE VALUE FROM 10 TO 100, AND A IS A CAPPING GROUP SELECTED FROM THE GROUP CONSISTING OF HYDROXY, ACYL, ETHER AND CARBONATE ESTER CAPPLING GROUPS;

2 5 TO 50 PERCENT BY WEIGHT OF POLYPROPYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE OF 1000 TO 200, 3.5 TO 50 PERCNT BY WEIGHT OF A GLYCOL COPOLYMER HAVING THE GENERAL FORMULA CH2=CH-D'"'"''"'"'M-(0C2H44)A(0H3H6)R'"'"''"'"', WHERIN A AND B ARE INTEGERS GREATER THAN ZERO AND EACH HAS AN AVERAGE VALUE SUCH THAT THE COPOLYMER HAS AN AVERAGE MOLECULR WEIGHT IN THE RANGE OF 2000 TO 300,D'"'"''"'"' IS AN ALKYLENE RADICAL CONTAINING FROM 1 TO 16 CARBON ATOMS, M IS ZERO OR ONE, AND R'"'"''"'"' IS A CAPPING GROUP, SELECTED FROM THE FROUP CONSISTING OF HYDROXY, ACYL, ETHER AND CARBONATE ESTER CAPPING GROUPS;

AND 4.40 TO 85 PERCENT BY WEIGHT OF WATER.

2. An antifoam composition as defined in claim 1 consisting essentially of 5 to 13 percent of (1), 5 to 15 percent of (2), 5 to 15 percent of (3), and 65 to 75 percent of (4).

3. An antifoam composition as deFined in claim 2 wherein in (1) x is from 50 to 100, y is from 5 to 10, D contains from 1 to 18 carbon atoms, R is composed of only ethylene and propylene radicals, (2) has an average molecular weight in the range of 1200 to 1800, and in (3) the copolymer has an average molecular weight of 2200 to 2800.

4. 40 to 85 percent by weight of water.