What is gel nail polish, and how does it create durable ... - C&EN

15 Jul.,2024

 

What is gel nail polish, and how does it create durable ... - C&EN

 

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Peruse the service menu at any nail salon, and you&#;ll be confronted with a staggering array of choices for your manicure: exfoliation, extensions, a rainbow of colors, tips, intricate nail art, and more.

If you&#;re looking for a simple pop of color and a glossy finish, the first decision you&#;re likely to make is what kind of nail polish to get: regular or gel. Bottles of both types of polish are often lined up next to each other, with different-colored caps denoting at a glance which is which.

The first difference you might notice between gel and regular polish is the price: gel polish is more expensive. But, your nail tech might tell you, it hardens in less than a minute with the help of a special curing lamp, and it&#;s much less likely to chip. The downside is that gel is more difficult to remove: it has to be soaked&#;or in some cases filed&#;off, rather than coming off with a quick wipe.

All those different properties are due to regular and gel polish having very different chemistries.

Nailing the science

&#;Whatever we put on our nails has to behave like an industrial coating, and yet at the same time be aesthetically pleasing and come off easily,&#; says Frank Pagano, a cosmetic chemist who worked on nail polish formulation at Revlon for a decade. With a $2.3 billion market in the US, according to the market research firm Mintel, the nail care industry offers a multitude of products that reflect the range of things consumers might prioritize. Want something quick drying and chip resistant? Gel might be your friend. Want to be able to easily change your look at home? Maybe stick with regular.

All nail polishes are polymeric coatings applied on top of natural nails. The variation comes from which type of polymers they are. Regular nail polish is based mostly on nitrocellulose and hardens after solvent evaporation. Gel, acrylic, and powder, or &#;dip,&#; nails are all based on acrylic polymers, and the polymerization is part of the application process. Gel refers specifically to nail coatings in which the polymerization is triggered by light.

Many drugstore companies offer polishes that have &#;gel&#; in the name but are often just regular nitrocellulose-based polishes with fancy copolymers added to make them more chip resistant. If you don&#;t have to stick your hand under a lamp to harden your manicure, it&#;s not a gel.

When it comes to the details of the chemistry, &#;gel nail polish is like a play,&#; Pagano says. &#;You&#;re gonna have certain characters; it&#;s just a question of who&#;s playing the characters.&#; The stars of the show are the monomers and the photoinitiator, which cues those monomers to link up into polymer chains.

The photoinitiator&#;s role is to absorb ultraviolet light and split into radicals that kick-start polymerization. Two commonly used photoinitiators are benzoyl peroxide and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide.

The monomers that the photoinitiator pushes to polymerize are a mixture of various methacrylates. Hydroxyethyl methacrylate (HEMA) is a major component of many gel polishes; di-HEMA trimethyl- hexyl dicarbamate, another common ingredient, has two methacrylate groups so it can function as a cross-linker between polymer chains. There may also be a couple of other small methacrylates in the formula, as well as oligomers or polymers with reactive methacrylate groups. The interconnected polymer network these compounds form gives gels their chip resistance and staying power.

By tweaking the combination of building blocks, the same light-triggered reaction can be used to create polymer coatings with a range of properties. According to Emily Nagy, a licensed nail technician in Michigan, there are two main categories: soft gels, which have a flexible polymer network and can be removed by soaking them in solvents such as acetone; and hard gels, which are rigid and impermeable to solvents and must be filed off. Gels can also vary in viscosity, from the thin polish used for color coats to thick builder gels and even thicker moldable gels used for creating 3D nail designs.

A bottle of gel polish also contains plenty of supporting actors: stabilizers, rheology modifiers, preservatives, solvents, and, of course, pigments. Formulation scientists work hard to create a base formula that functions correctly and consistently for the whole product line and makes it easy to swap out the pigments. Cosmetic chemist Kelly Dobos says that &#;the consumer should expect the same thing every time,&#; no matter what molecule or mineral provides the color.

Illuminating safety

Nagy says her training to become a certified nail tech was largely focused on hygiene and how to prevent nail infections, which is important for all manicures. So is ensuring adequate ventilation to minimize the amount of volatile organic solvents hanging around in the air. But gels raise a couple of safety questions that traditional polishes don&#;t.

One concern is whether the ultraviolet from the lamps damages skin, as there are well-established links between UV and skin aging and cancer. Newer LED curing lamps, which deliver a narrower wavelength of light than fluorescent UV lamps, are supposed to be make the curing process faster and safer. But UV light is still essential to any gel manicure.

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A study published earlier this year in Nature Communications (DOI: 10./s-023--8) found that an LED nail dryer caused DNA damage to mouse and human cells in vitro. But other studies suggest that it would probably take a lot of time under the lamp to reach a threshold for serious damage to your hands (JAMA Dermatol. , DOI: 10./jamadermatol..). Still, because UV damage is cumulative over a lifetime, the American Academy of Dermatology recommends that people who regularly get gel manicures protect their skin with sunscreen.

Some ingredients in the polish also come with safety concerns. Methacrylates are skin irritants and sensitizers&#;people can become seriously allergic to them over time. And if that happens, there are bigger consequences than having to switch to regular nail polish: acrylates are used in a number of medical products, such as bone cement, dental fillings, and diabetic insulin pumps, that a person with such an allergy would not be able to tolerate.

In a study performed by the British Association of Dermatologists, 2.4% of people tested at dermatology clinics showed an allergic reaction to at least one methacrylate compound.

Cosmetic Ingredient Review, a US personal care product safety nonprofit, has concluded that acrylates in nail products are safe to use as directed. Nails aren&#;t very porous, so the short amount of time that the uncured monomer is on them is unlikely to cause harm. If there&#;s minimal contact between uncured nail polish and the skin around your nails&#;which a good nail tech will ensure&#;gel manicures are considered safe. In the EU, regulations say products containing HEMA and di-HEMA trimethylhexyl carbamate are for professional use only.

But DIY manicures have had an uptick in popularity since the pandemic. According to a survey by Mintel, 25% of 1,412 respondents said they had used gel nail polish at home.

Most drugstore brands that sell at-home gel kits in the US make ingredient and safety information available on the packaging and on their websites, as required by the US Food and Drug Administration, but some sites make it easier than others to find that information.

For your health and that of your nails, &#;it&#;s really important to think about . . . going to a professional&#; if you want a gel manicure, Dobos says.

Nagy recommends that clients find a nail tech who educates themselves on the evolving landscape of nail products and keeps an open dialogue with clients about any health or safety concerns they might have. &#;The burden of information needs to be on the nail technician and not on the client.&#;

The professional gel nail polish evolution

Gel nails have become an increasingly popular type of manicure in the last decade, and for good reason. Gel nails are a kind of nail polish that, when cured with a UV lamp, produces a glossy, durable manicure that cures quickly. Gel nail polish is applied to the nails, cured under a UV or LED lamp and then sealed with a topcoat. Gel nails offer many benefits over other types of artificial nails such as longer wear time, faster curing time, and stronger adhesion. In this piece, we'll explore the history, evolution and what the future could hold for gel nails. 

Consumer reaction and benefits 


The evolution of gel polish has been pivotal in revolutionizing the nail industry. It has made manicures quicker and more accessible than ever before.  Many professional technicians now specialize in providing gel polishes, catering to clients with a variety of preferences. Products that resembled gel polish first appeared in the s but, due to the curing methods involved, many brands pulled their products from the market. It wasn't until that gel polish and the professional gel polish processes that we recognize today gained prominence in the market when CND launched their Power Polish. 


So what is it about professional gel polishes that customers loved so much?  Well, one of the main advantages is that it offers a longer wear time than other types of nail polishes. It also allows for a more even application and requires fewer coats. The fundamental benefit as far as customers were concerned vs. traditional nail lacquer (or nail polish) is that professional gel polish is much less likely to chip and peel which means a manicure can last much longer. 

Diversity in finishes 


One of the benefits of professional gel polishes that customers love so much is the diverse range of finishes.  There is a color and finish to suit every occasion. Whether going for a vibrant pink, French Manicure look or something more edgy and modern like chrome, there's bound to be a Glitterbels gel polish that will make a customer's nails stand out. The diversity of colors available means that people can experiment with different looks and create truly unique designs. 

The rise of gel polish 


The rise in the use of professional gel nail products, in fact, all nail products has been exponential. Grand View Research anticipate that the sales of gel nail polish (professional and consumer) will grow by 8% per annum between now and .  This growth has been driven by a combination of increased consumer demand, the availability of more varied products and the rise of nail treatments more generally. 

 

The Future

At this point, it is fair to say, that gel nails have revolutionised the way we think about manicures and nail art. But what does the future hold for gel polishes? One trend that we have been proud to be at the forefront of is HEMA-free products. Here at Glitterbels we started hearing about the negative impacts of HEMA and decided to do something about it. We have already created a HEMA-free builder gel and we can see HEMA-free products becoming the norm, especially for professional nail products. 


To wrap up, gel polish is no longer just a trend but is now an industry standard. With the help of innovative products and techniques, it has revolutionized the nail industry, giving consumers access to longer-lasting manicures with a wider range of designs. The future looks bright for professional gel polishes and here at Glitterbels we are proud to be paving the way for more HEMA-free products. 


We are certain that the popularity of gel polishes will continue to grow, as more people understand and appreciate the unique benefits it can bring. With many creative possibilities available, it's no wonder that professional gel polish is becoming increasingly popular amongst customers all around the world. Who knows what new trends we may see in this space very soon? 

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