History of Super Absorbent Polymer Chemistry

April 30, 2021

Until the 1980s, water-absorbing materials were cellulosic or fiber-based products. Choices were tissue paper, cotton, sponge, and fluff pulp. The water retention capacity of these types of materials is only 20 times their weight – at most.

In the early 1960s, the United States Department of Agriculture (USDA) was conducting work on materials to improve water conservation in soils. They developed a resin based on the grafting of acrylonitrile polymer onto the backbone of starch molecules (i.e. starch-grafting). The hydrolyzed product of the hydrolysis of this starch-acrylonitrile co-polymer gave water absorption greater than 400 times its weight. Also, the gel did not release liquid water the way that fiber-based absorbents do. The polymer came to be known as “Super Slurper”. The USDA gave the technical know-how to several USA companies for further development of the basic technology. A wide range of grating combinations was attempted including work with acrylic acid, acrylamide, and polyvinyl alcohol (PVA).

Since Japanese companies were excluded by the USDA, they started independent research using starch, carboxymethylcellulose (CMC), acrylic acid, polyvinyl alcohol (PVA), and isobutylene maleic anhydride (IMA).

Early global participants in the development of super-absorbent chemistry included Dow Chemical, Hercules, General Mills Chemical, DuPont, National Starch & Chemical, Enka (Akzo), Sanyo Chemical, Sumitomo Chemical, Kao, Nihon Starch, and Japan Explain.

In the early 1970s, the super absorbent polymer was used commercially for the first time – not for soil amendment applications as originally intended – but for disposable hygienic products. The first product markets were feminine sanitary napkins and adult incontinence products.

In 1978, Park Davis (d.b.a. Professional Medical Products) used super absorbent polymers in sanitary napkins.

The super absorbent polymer was first used in Europe in a baby diaper in 1982 when Schickendanz and Beghin-Say added the material to the absorbent core. Shortly thereafter, UniCharm introduced super absorbent baby diapers in Japan while Proctor & Gamble and Kimberly-Clark in the USA began to use the material.

The development of super absorbent technology and performance has been largely led by demands in the disposable hygiene segment. Strides in absorption performance have allowed the development of the ultra-thin baby diaper which uses a fraction of the materials – particularly fluff pulp – which earlier disposable diapers consumed.

Over the years, technology has progressed so that there is little if any starch-grafted super absorbent polymer used in disposable hygienic products. These super absorbents typically are cross-linked acrylic homopolymers (usually Sodium neutralized).

Superabsorbents used in soil amendments applications tend to be cross-linked acrylic-acrylamide copolymers (usually Potassium neutralized). Besides granular super absorbent polymers, ARCO Chemical developed a super absorbent fiber technology in the early 1990s. This technology was eventually sold to Camelot Absorbents. There are super absorbent fibers commercially available today. While significantly more expensive than granular polymers, the superabsorbent fibers offer technical advantages in certain niche markets including cable wrap, medical devices, and food packaging.

It mixes with soil to increase the soil’s capacity for holding water (with water gel form which stays in the soil for months) and making it available to plants. This improved soil readily releases moisture, along with water-soluble nutrients, to plant roots on demand.

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