There is a major market for siloxane surfactants for polyurethane foams. Siloxanes give lower surface tension than typical surfactants which use hydrocarbon hydrophobes. The typical siloxane surfactant for polyurethane foams is a nonionic block copolymer of a methyl siloxane and polyethylene glycol. Surfactants used with isocyanates are end capped and do not have any hydroxyl end groups. Silicone surfactants have shown to be a major contributor to fogging in car seating. Non-silicone surfactants based on butylene oxide-ethylene oxide block polymer have found a market in low fogging foams. The addition of surfactants to both the polyol and the isocyanate has shown to improve the cell structure in MDI foams

Chemical Name Composition




Silicone surfactants

Siloxanes and Silicones, di-Me, 3-hydroxypropyl Me, ethoxylated propoxylated  68937-55-3 Surfactant for polyol Reactive
Siloxanes and Silicones, di-Me, 3-hydroxypropyl Me, ethers with polyethylene-polypropylene glycol mono-Me ether 67762-85-0 Surfactant for isocyanate Non reactive Silwet L 7001
Silwet L 7605
Tegopren 5878
Polyoxyalkylene siloxanes and silicones 87244-72-2
Glycols, polyethylene, methyl 3-[1,3,3,3-tetramethyl-1-(trimethylsiloxy)disiloxanyl]propyl ether 27306-78-1 Silwet L-77
Poly(oxy-1,2-ethanediyl), a-acetyl-w-[3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]disiloxanyl]propoxy]- 125997-17-3 Silwet Y 12808
Siloxanes and silicones, dimethyl, 3-hydroxypropyl methyl, ethoxylated  68937-54-2 Silwet FZ 2171
3-(Polyoxyethylene)propylheptamethyltrisiloxane 67674-67-3 Dow Corning 5212
Silwet 408
Di-Me siloxanes, hydroxy-terminated, ethoxylated 63148-55-0 Dow Corning 4-3667 Silicone DC 470A

Nonsilicone surfactant

Butylene oxide propylene oxide block copolymer 27637-03-2 27517-34-6 Surfactant for polyol US5,674,918 US5,600,019
Alcohols, C9-11-branched and linear, ethers with ethyloxirane-oxirane polymer mono-Me ether 111163-38-3 

Surfactant for isocyanate

1,2-Butylene oxide-ethylene oxide copolymer ether with dodecyl alcohol 39454-63-2 Surfactant for polyol
Allyloxypolyethyleneglycol methyl ether 27252-80-8 Additive to surfactants

Last edited on:

November 14, 2006

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