Energy savings plus mechanical reinforcement and rheology control

Polyalphaolefin HMA for the Assembly of Diapers

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Polyolefins

Applicable Industrial Sectors

Diaper lamination

Applicable Base Polymer Properties

The amorphous polyolefin based hot melts are widely used in such areas as diaper construction and non-wovens. The products are tailored copolymers of ethylene, propylene or 1-butene and exhibit a range of melt viscosities, needle penetrations and softening points, surface tackiness, and open times. Incorporation of 1-butene gives copolymer products long open times and low softening points.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polyalphaolefin, 1-butene, copolymer (RT 2780, Rexene Products)

Polyalphaolefin, propylene homopolymer (RT 2115, Rexene Products)

Tackifier, cycloaliphatic hydrocarbon resin (Escorez 5300, ExxonMobil)

(Source: Sustic, A. and Pellon, B., “Novel Amorphous Polyalphaolefins (APAO) in Hot Melt Adhesive Formulations”, Polymers, Laminations, and Coatings Conference, Tappi Proceedings, TAPPI, 1991.)

Typical Properties

Properties

Melt viscosity, mPa-s

xxxx

Needle penetration (clmm)

Softening point, °C

xxx

SAFT, °C

Open time, sec

Processing

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Resulting Properties

The APAP formulation presented here shows properties which makes them highly desirable to be used in non-woven fabric assembly applications. The SAFT is somewhat dependent on the molecular weight as well as on the softening points of the copolymers. The tensile strength varies proportionally with the softness of the polymers. The compatibility of blends with tackifiers and waxes is directly related to the chemical nature of the copolymer and its molecular weight.