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Hairsprays belong to a class of personal care products that help hair to hold a desired style. These products contain film forming ingredients that are applied as a fine mist. When dry, these chemicals form tiny glue-like spots that hold the hair shafts together. Hairsprays are formulated as aerosols that are powered by pressurized gasses or non-aerosols that are dispensed by manually depressing a pump.

History

Women have used natural compounds (such as clays and gums) to hold their hair in place since antiquity. The modern hairspray was not born until aerosol spray containers were developed by the United States Army during World War II. The army created this technology to enable them to spray insecticides over large areas. Over the next decade or so, aerosol technology spread to other industries such as paints and coatings and personal care. The first commercial hairsprays were marketed in the late 1940s. These early products used shellac, a natural resin, to hold hair in place. In the last 50 years researchers have improved both the quality of hairspray ingredients and the aerosol packaging used to deliver them. Hairsprays have since become an important part of the hair care market.

Raw Materials

Holding agents

Hairsprays work by coating the hair with polymers, which are long chain chemical compounds. Polymers are sometimes called resins because natural resin materials (like shellac) were used in the first hair sprays. The key property that makes polymers useful as hair holding agents is their ability to form films upon drying. Once hair spray is applied to the hair, the liquid drops run down the hair shaft until they reach the intersection of two hair fibers. When the drops dry at this fiber intersection, they create an invisible film that bonds hairs together.

Chemists may choose from many different polymers when developing hair styling products. For example, polyvinylpyrrolidone (also known as PVP) is a common polymer used in hair styling products. However, it does not provide a strong hold and it tends to pick up moisture from the air. To remedy this situation chemists combine PVP with another polymer, vinyl acetate. The resulting mixture, PVPVA, is a copolymer that has improved humidity resistance and will therefore hold curls better. However, if not properly formulated PVPVA copolymers can be so waterproof that they become difficult to wash out of the hair. Another common copolymer is made from vinyl acetate and crotonic acid. This ingredient is popular because it provides the proper balance of hardness, solubility, and moisture susceptibility.
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