Hot melt adhesive composition and use thereof
AssigneeHenkel AG & Co. KGaA
InventorsYuhong HU, Darshak R. DESAI, Jinyu CHEN, Matthew L. Sharak
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Abstract
The sprayable olefin-based hot melt adhesive and absorbent articles comprising the adhesive are disclosed. The sprayable olefin-based hot melt adhesive is particularly suitable for spraying at low application temperatures. The sprayable low application temperature hot melt adhesives have high green strength, excellent bond strength and aging performance. Moreover, the sprayable low application temperature hot melt adhesives allows for thin bond lines without bleed-through and burn-through risks for heat-sensitive substrates.
Claims20
A hot melt adhesive comprising:
- (a) about 5 to about 40 wt % of a polypropylene-polyethylene (co) polymer having (i) a propylene content of about 70 to about 95 wt % of the (co)polymer, (ii) a polydispersity (Mw/Mn) index of less than about 3.0, (iii) a melt flow rate of about 20 to about 300 g/10 min measured at 230° C./2.16 kg in accordance with ASTM D1238, (iv) a melting point of less than about 90° C., measured in accordance with ASTM 3418, and (v) a heat of fusion value of less than about 35 J/g measured at 1° C./min heating and cooling rate in accordance with ASTM D3418-12;
- (b) about 30 to about 70 wt % of a tackifier;
- and
- (c) optionally up to about 30 wt % of a wax or a plasticizer;
- wherein the adhesive has (i) a tan(δ) value of greater than about 30 at 140° C., 10 rad/s and (ii) a melt viscosity of about 2,000 to about 11,000 cps at 150° C., measured in accordance with ASTM 3236-88.
A hot melt adhesive consisting essentially of:
- (a) about 5 to about 40 wt % of a polypropylene-polyethylene (co) polymer having (i) a propylene content of about 70 to about 95 wt % of the (co)polymer, (ii) a polydispersity (Mw/Mn) index of less than about 3.0, (iii) a melt flow rate of about 20 to about 300g/min measured at 230° C./2.16 in accordance with ASTM D1238, (iv) a melting point of less than about 90° C., measured in accordance with ASTM 3418, and (v) a heat of fusion value of less than about 35 J/g measured at 10° C./min heating and cooling rate in accordance with ASTM D3418-12;
- (b) about 30 to about 70 wt % of a tackifier
- (c) about 1 to about 50 wt % of an amorphous poly alpha olefin polymer;
- and
- (d) about 1 to about 30 wt % of the wax and/or a plasticizer;
- wherein the adhesive has (i) a tan(δ) value of greater than about 30 at 140° C., 10 rad/s and (ii) a melt viscosity of about 2,000 to about 11,000 cps at 150° C., measured in accordance with ASTM 3236-88.
Dependencies are inferred from the claim text.