Polyamide compositions for personal care

摘要

Polyamide compositions useful for personal care are disclosed, including film-forming concentrates and emulsions. Ethanol-based concentrates comprise a hydrophobic polyamide, which comprises a reaction product of either (a) a dimerized fatty acid, at least one C2-C4 carboxylic acid, and a polyamine component comprising ethylenediamine and 1 to 30 eq. % of one or more di- or triamines; or (b) a dimerized fatty acid, at least 50 wt. % of a C16-C22 unsaturated carboxylic acid, and at least one C2-C6 diamine. Personal care applications for the concentrates, including continuous sunscreens, fragrant body sprays or splashes, anti-acne medications, are included. Water-in-oil emulsions comprising the hydrophobic polyamides are storage-stable and provide water-resistant SPF for products such as sunscreens and body lotions.

主权项

1. A clear, film-forming concentrate, suitable for use in personal care products, comprising 50 to 99.9 wt. % of ethanol and 0.1 to 50 wt. % of a hydrophobic polyamide, wherein the polyamide comprises either:
(a) a reaction product of a group of reactants, said group consisting of a dimerized fatty acid, acetic acid, propionic acid, and a polyamine component comprising ethylenediamine and 1 to 30 eq. % of one or more di- or triamines; or (b) a reaction product of a dimerized fatty acid, at least 50 wt. % of a C16-C22 unsaturated carboxylic acid, and at least one C2-C6 diamine; wherein the polyamide has a number average molecular weight within the range of 1000 to 5000, an acid number less than 10 mg KOH/g, and an amine number less than 5 mg KOH/g.