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Silicone emulsion (water-based) coatings offer some features of solventless and solvent-based coatings, and some unique advantages of their own.
Advantages:
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Same premium release performance as solventless coatings
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Uniform, low coat weights can be obtained on simple solvent coating equipment
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Can be used in size press operations
Disadvantages:
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Wetting and drying process tends to stress the paper
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Buckling, curling and cockling may occur
Thickeners can be added that allow emulsion coatings to be used on more porous papers, previously considered unsuitable for silicone pressure-sensitive release applications. Thickeners increase coating viscosity, which reduces penetration and prevents rupturing of the emulsion film during drying.
Use emulsion coatings if:
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Smoothness is secondary to paper cost savings
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You need to use solvent-type coating equipment
Use solventless or solvent-based coatings if:
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Maintaining paper smoothness is essential
Emulsion delivery systems have been used successfully with platinum and tin-based cure chemistries.
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