Waterproof Ingredient for Whitening Cream

You are looking for an ingredient to make your skin whitening cream water-resistant, as Unimer U151 did not provide this property. Unimer U151 is typically a thickener and does not directly provide water-repelling or film-forming properties for water resistance.

To make a cream water-resistant or more durable on the skin, especially in formulas containing water, you can consider using film-forming polymers or ingredients that create a protective layer on the skin.

Based on the information found, here are some relevant ingredients:

• Comfort Film (Water Base): This is a polymer designed for water-based formulas. It helps create a comfortable, non-sticky film on the skin, making the product more durable and stay on the skin longer. This implies a degree of water resistance, preventing the cream from washing off easily when exposed to water. It is suitable for general skincare creams where durability on the skin is desired.
• LipidSoft™ Resist: This is an ester that helps disperse pigments and forms a coating film on the skin. It has good waterproof and long-lasting properties, making it suitable for long-wear makeup or skincare formulas that aim to create an occlusive layer to reduce water loss and help the product adhere to the skin. If your cream formula contains an oil phase, this ingredient is a good option.

Therefore, if your cream formula is water-based (primarily contains water with minimal oil), Comfort Film (Water Base) is a suitable choice to help create a film that makes the cream more durable and water-resistant on the skin. If your formula includes an oil phase, LipidSoft™ Resist is another option that provides good water resistance.