NOVELTY - Acetal ester is produced from glycerin, organic aldehydes, and carboxylic or dicarboxylic acids such as humectants, solvents, additives, lubricants, softeners, plasticizers, surfactants, dispersants. The obtained product optionally contains natural antioxidants from purified glycerin whose process prevents distillation and preserves the presence of tocopherols and other active ingredients such as sterols and squalene. Glycerin is distilled glycerin, USP glycerin or blond glycerin, preferably purified glycerin.    USE - Acetal ester, in particular mono and diesters of acetals e.g. butyl laurate, isobutyl and ethylhexyl acetal for lubricant formulations used as solvents and as component in formulations for cutting fluids for metal laminations e.g. aluminum, refrigeration lubricants, and lubricants for drilling oil wells, cosmetic formulations used as solvent and diluent for active ingredients as sunscreens, capric and caprylic esters used as donor agent of oiliness in cosmetic formulations, and plasticizer for nail polish, plasticizers for synthetic or natural rubber, cellulose, nitrocellulose, acrylic resins, cutting fluids, industrial lubricants for metal laminates, leather industry for processing textiles such as threads and fabrics, biofuel industry for combustion processes of biofuels, reducing and adjusting point of cold plugging of biofuels made from vegetable oils and animal fats, polar polymers e.g. polyvinyl chloride, nitrocellulose, acrylics, humectants in water based inks, agricultural formulations, surfactants and dispersants for inks, dewatering agents in metal laminates as aluminum, polyvinyl chloride to produce plastisols used in automotive industry, flexible PVC films, PVC plastic component for toys, PVC hoses, PVC shoes, used in paint industry as plasticizers for nitrocellulose resins, polyurethane-based resins, adhesive industry as plasticizers for acrylic resins, vinyl polyacetates and polyamide resins, and agricultural industry as stabilizing agents of chlorinated substances (all claimed).    ADVANTAGE - The acetal ester have excellent spreadability on the skin and protects skin against aging, and has excellent compatibility with polar solvents such as polymers or herbicides and insecticides, functionality, polarity, chemical stability, transparency, color stability and flexibility, and reduced volatility and exudation properties.    DETAILED DESCRIPTION - Acetal ester is produced from glycerin, organic aldehydes, and carboxylic or dicarboxylic acids such as humectants, solvents, additives, lubricants, softeners, plasticizers, surfactants, dispersants. The obtained product optionally contains natural antioxidants from purified glycerin whose process prevents distillation and preserves the presence of tocopherols and other active ingredients such as sterols and squalene. The glycerin is distilled glycerin, USP glycerin or blond glycerin, preferably purified glycerin. Organic aldehydes are propionaldehyde, isoamyl aldehyde, nonaldehyde, decanaldehyde, isotridecyl aldehyde, furfuraldehyde or benzaldehyde, preferably butyraldehyde, isobutyraldehyde or ethylhexaldehyde. Carboxylic acids are acetic acid, propionic acid, butyric acid, hexoic acid, capric acid, caprylic acid, 2-ethylhexanoic acid, nonanoic acid, decanoic acid, lauric acid, palmitic acid, myristic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid, arachidonic acid, lactic acid, citric acid, benzoic acid, acrylic acid, methacrylic acid or their methyl and ethyl esters. Dicarboxylic acids are adipic acid, orthophthalic acid, maleic acid, succinic acid, terephthalic acid, oxalic acid, maleic acid, dimerized fatty acids or their methyl and ethyl diesters. The alcohols used for the synthesis of hybrid ester are methyl, ethyl, propyl, butyl, isobutyl, amyl or isoamyl alcohol, hexanol, octanol, decanol, dodecanol, cetostearyl alcohol, guebert alcohol, or oleyl alcohol, preferably isoamyl alcohol from natural origin. The acetal is produced by esterification or transesterification reaction, preferably with in situ formation of the acetal, or acetal and ester in a single step. The molar ratio between glycerol, aldehyde and carboxyl group is 10:20:1-3:6:1, preferably 1.5:2:1. The reaction temperature is 80-250 degrees C, preferably 140-180 degrees C. The catalysts are organometallic acids and acids chosen from sulfuric acid, phosphoric acid, methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, trifluoromethanesulfonic acid, hydrochloric acid, nitric acid, tin oxalate, tin oxalate, and organic derivatives of tin, preferably methanesulfonic acid, p-toluenesulfonic acid, tin oxalate or trifluoromethanesulfonic acid. The amount of catalyst is 100-100000 ppm, preferably 500-5000 ppm.