Energy savings plus mechanical reinforcement and rheology control

Hydrophilic SBS Hot Melt Adhesive for Disposables

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Styrene Block Copolymers, SBC (SBS, SEBS, SEPS, SIS)

Applicable Industrial Sectors

Disposable & Tissues

Applicable Base Polymer Properties

Styrene block copolymers (SBCs) offer cohesion, strength, and heat resistance for both pressure sensitive adhesives (PSAs) and non-pressure sensitive adhesives. The styrene phase forms a physically crosslinked network in the adhesive at room temperature. Of the SBCs, styrene butadiene styrene has the highest shear strength and moderately good peel strength.

Typical Formulation Ingredients

Ingredient

Parts by weight

Tall-oil rosin ester (Unitack R100L from Union Camp)

xxxx

SBS copolymer (Stereon 840A from Firestone

Mineral oil (Kaydol from Witco)

Nonionic surfactant (Atmer 688 from ICI)

xxx

Antioxidant (Irganox 1010 from Ciba-Geigy)

(Source: US 6,380,292)

Typical Properties

Properties

Viscosity at 325°F, cps

xxxx

Contact angle, degrees

Peel strength, gm

Processing

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Resulting Properties

Hydrophilic hot melt adhesive compositions are suitable for a variety of applications, especially in nonwoven disposable articles. These are prepared by blending various adhesive components with a surfactant. The surfactant has a hydrophile-lipophile balance (HLB) number of less than 15, and is incorporated into the composition in an amount such that the resultant adhesive has a contact angle of 75° or less, and preferably less than about 40°.

A low contact angle is desirable so that water, urine or other water-based discharges, upon contacting a laminate bound together by the adhesive, wets out rather than beads up resulting in the fluid being directed away from the adhesive and towards an absorbent core of the disposable article.