GB903565A - Organopolysiloxane compositions having anti-foaming properties - Google Patents

Organopolysiloxane compositions having anti-foaming properties

Info

Publication number
GB903565A
GB903565A GB297961A GB297961A GB903565A GB 903565 A GB903565 A GB 903565A GB 297961 A GB297961 A GB 297961A GB 297961 A GB297961 A GB 297961A GB 903565 A GB903565 A GB 903565A
Authority
GB
United Kingdom
Prior art keywords
polyvinyl alcohol
paste
silica
properties
siloxane
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.)
Expired
Application number
GB297961A
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.)
Rhone Poulenc SA
Original Assignee
Rhone Poulenc SA
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 Rhone Poulenc SA filed Critical Rhone Poulenc SA
Publication of GB903565A publication Critical patent/GB903565A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/02—Foam dispersion or prevention
    • B01D19/04—Foam dispersion or prevention by addition of chemical substances
    • B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
    • B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—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
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Dispersion Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Colloid Chemistry (AREA)

Abstract

An anti-foaming composition, which is an aqueous emulsion comprising (by weight) 1-60% of a dimethyl polysiloxane oil, 0,1-10% of finely divided silica, preferably having a particle size less than 50m m , and 0,2-10% of polyvinyl alcohol as sole emulsifying agent (see Group IV(a)), can be made by mixing the silica with the siloxane, heating the resulting paste at 100 DEG to 250 DEG C., adding to the cooled paste an aqueous solution of polyvinyl alcohol and the requisite amount of water and milling the resulting mixture in a colloid mill. An example is given of the above composition and its properties are compared with similar compositions containing different emulsifying agents. Specification 884,972 is referred to.ALSO:An anti-foaming composition, which is an aqueous emulsion comprising (by weight) 1-60% of a dimethylpolysiloxane oil, 0,1-10% of finely divided silica, preferably having a particle size less than 50 n .n ., and 0,2-10% of polyvinyl alcohol as sole emulsifying agent, can be made by mixing the silica with the siloxane, heating the resulting paste at 100 DEG to 250 DEG C., adding to the cooled paste an aqueous solution of polyvinyl alcohol and the requisite amount of water and milling the resulting mixture in a colloid mill. An example is given of the above composition and its properties are compared with similar compositions containing different emulsifying agents. Specification 884,972 is referred to.
GB297961A 1960-02-25 1961-01-25 Organopolysiloxane compositions having anti-foaming properties Expired GB903565A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR819594A FR1257811A (en) 1960-02-25 1960-02-25 Organopolysiloxane compositions with antifoaming properties

Publications (1)

Publication Number Publication Date
GB903565A true GB903565A (en) 1962-08-15

Family

ID=8725818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB297961A Expired GB903565A (en) 1960-02-25 1961-01-25 Organopolysiloxane compositions having anti-foaming properties

Country Status (4)

Country Link
DE (1) DE1242570B (en)
ES (1) ES264244A1 (en)
FR (1) FR1257811A (en)
GB (1) GB903565A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001573A1 (en) * 1980-01-17 1981-07-23 Degussa Ag, 6000 Frankfurt METHOD FOR PRODUCING SEDIMENTATION-STABLE FOAM CONTROL AGENTS
DE3114268A1 (en) * 1981-04-09 1983-01-27 Degussa Ag, 6000 Frankfurt METHOD FOR PRODUCING ANTI-FOAM AGENTS FOR AQUEOUS SYSTEMS
FR2755878A1 (en) * 1996-11-15 1998-05-22 Rhodia Chimie Sa PROCESS FOR THE PREPARATION OF SILICONE AND POLYVINYL ALCOHOL ANTI-MOUS EMULSIONS
EP1132417A2 (en) * 2000-03-09 2001-09-12 Goldschmidt AG Process for preparing polyorganosiloxane emulsions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19922915A1 (en) * 1999-05-19 2000-11-23 Wacker Chemie Gmbh Polymer dispersion for use e.g. in coatings and adhesives, contains foam suppressant comprising linear organopolysiloxane with mainly tri- and di-organylsiloxy units and organopolysiloxane resin

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE551109A (en) * 1955-09-22

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001573A1 (en) * 1980-01-17 1981-07-23 Degussa Ag, 6000 Frankfurt METHOD FOR PRODUCING SEDIMENTATION-STABLE FOAM CONTROL AGENTS
US4406817A (en) 1980-01-17 1983-09-27 Degussa Aktiengesellschaft Process for the production of sedimentation stable anti-foam agents
DE3114268A1 (en) * 1981-04-09 1983-01-27 Degussa Ag, 6000 Frankfurt METHOD FOR PRODUCING ANTI-FOAM AGENTS FOR AQUEOUS SYSTEMS
FR2755878A1 (en) * 1996-11-15 1998-05-22 Rhodia Chimie Sa PROCESS FOR THE PREPARATION OF SILICONE AND POLYVINYL ALCOHOL ANTI-MOUS EMULSIONS
WO1998022196A1 (en) * 1996-11-15 1998-05-28 Rhodia Chimie Method for preparing anti-foaming emulsions with silicon and polyvinyl alcohol base
EP1132417A2 (en) * 2000-03-09 2001-09-12 Goldschmidt AG Process for preparing polyorganosiloxane emulsions
EP1132417A3 (en) * 2000-03-09 2002-08-14 Goldschmidt AG Process for preparing polyorganosiloxane emulsions

Also Published As

Publication number Publication date
FR1257811A (en) 1961-04-07
DE1242570B (en) 1967-06-22
ES264244A1 (en) 1961-03-16

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