Thinner, softer and leak-free diapers for babies are the market trend as customer demands. Diaper manufacturers are making investments in innovation to the better use of elastics and using new core technology to allowed for better liquid distribution.

Hygiene adhesive is a kind of SIS/SBS based HMA, can be used in absorbent sanitary baby diapers. The types are identified as backsheet adhesives, construction adhesives, leg and cuff elastic adhesives, wetness indicator adhesives, core adhesives, landing tape and stretch ear adhesives. Adhesives provide adhesion and elastic ability to each component of diaper. How to choose a right adhesion solution, it will effect on strength, lightweight, elastic and cost for the baby care products.

HMAS for baby diaper © Foreverest
Hildebrand Solubility Parameter of Common Tackifier Resins © Foreverest

Adhesives & Nonwovens in Diaper

In baby care market, there are two mainly types of adhesion system. SBC based polymers adhesive, includes Styrene butadiene styrene (SBS), Styrene isoprene styrene (SIS), Styrene ethylene/butylene styrene (SEBS) and Styrene ethylene/propylene styrene (SEPS). SEBS is the hydrogenated form of SBS, SEPS is the hydrogenated form of SIS.

The disposable hygiene products use SIS/SBS based HMAs for the abilities to retain flexibility and elasticity at low temperature. They have well value in cost, and with benefits of high initial tack strength, while tend to harden (and lose adhesion) over time, especially exposed to sunlight and weather.

The other adhesion system is APAO based adhesive. Amorphous polyalpha olefins (APAO) system is non-crystalline adhesives that remain soft, tacky, and flexible giving longer open time and good adhesion.

It provides advanced moisture resistance, chemical resistance and heat resistance, especially the slight odor and low VOCs compared to SBC based adhesives. The key players of APAO polymers include Evonik, Eastman, REXtac and Qida Chemical.

Hydrogenated Terpene Resin is not exclusive any more

Foreverest Resource is a specialty bio-based derivative polymers supplier. The Foreverest® Extra Light  Hydrogenated Terpene Resin HTR105 is designed for high performance HMPSA, which used in disposable hygiene market, such like baby diapers, feminine hygiene, medical lamination, pet lamination application.

HTR105 has excellent properties in water white colour, thermal stability and weather resistance. It is a new product of terpene polymer. Unlike common terpene resins, HTR105 fixes the colour issue in personal care application, has the same high adhesion performance compared to hydrogenated C5/C9 resins. It’s a bio-based tackifier for disposable hygiene adhesives.

Hydrogenated Terpene Resin © Foreverest
Hydrogenated Terpene Resin © Foreverest

Available Tackifier Resins for Disposable Hygiene HMA

Tackifier Type CAS Number Chemicals Name Softening Point,
R&B, °C
Acid Value,
Rosin Ester Based 8050-31-5 Glyceryl Rosinate 85 to 95 10 max 1 to 5
65997-13-9 Glyceryl Hydrogenated Rosinate 85 to 105 10 max 1 to 5
8050-26-8 Pentaerythritol Rosinate 90 to 115 15 to 25 1 to 5
64365-17-9 Pentaerythritol Hydrogenated Rosinate 90 to 115 15 to 25 1 to 5
9006-47-7 Polymerized Rosin Ester 100 to 160 10 to 25 8 to 10
N/A Maleic Modified Rosin Ester 95 to 145 15 to 45 3 to 6
Terpene Phenolic Based 68648-57-7 Terpene Phenolic Resin 100 to 130 1 max 7 to 9
68648-57-7 Terpene Phenolic Resin Emulsion 95 to 105 N/A N/A
106168-39-2 Hydrogenated Terpene Polymer 100 to 110 1 max 50 max, Hazen
31393-98-3 Polyterpene Resin N/A 1 max 4 to 6
31393-98-3 Polyterpene Resin 120 to 165 1 max 7 to 10
Styrenated Terpenes based N/A Styrenated Terpene Resin 75 to 120 1 max 3 max

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