| Plastics & Rubbers - Anti-fogging additives |
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The term 'fogging' refers to the condensation of small water droplets on the surface of a transparent film.
The main adverse effect of fog on agricultural films is the attenuation of light transmission, leading to a reduction in plant growth.
Fog is also undesirable on food packaging films because it affects the visual attractiveness of the product to the potential buyer.
Typical anti-fogging agents are non-ionic surfactants that enhance the polymer wettability and reduce the contact angle between the water droplets and the film surface.
Glycerol monooleate (GMO) is one of the most popular anti-fogging agents because it is cheap and food compatible. However, its effectiveness is limited and not always consistent.
Polyglycerol fatty acid esters are good substitutes for GMO. They are more hydrophilic, less volatile and more stable to degradation than the equivalent glycerides. They exhibit excellent anti-fogging properties in various polymer matrices, including polyolefins and PVC.
Polyglycerols for Ester Production (1410 KB)
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Polyglycerols in Industrial Applications (1289 KB)
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Diglycerol
A distilled product (min. 90% purity) with unique properties.
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Polyglycerol-3
A polyglycerol characterized by a very narrow oligomer distribution centered on triglycerol.
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Polyglycerol-4
A heavier polyglycerol focused on tetraglycerol.
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