Hot melt adhesive
AssigneeThe Procter & Gamble Company
InventorWilliam L. Bunnelle
Life of this patent
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Abstract
A hot melt adhesive material and articles made using the hot melt adhesive to assemble structures in an article. The adhesive material typically is manufactured by blending amorphous polymer with a heterophase polymer having crystallinity into an adhesive composition.
Claims20
An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween, wherein the absorbent article further comprises a hot melt adhesive composition comprising:
- (i) from about 10 wt. % to about 90 wt. % of an amorphous polyolefin composition comprising from about 30 mole % to about 70 mole % of 1-butene monomer units and a second C4-40 olefin polymer;
- and
- (ii) from about 10 wt. % to about 90 wt. % of a heterophase polyolefin copolymer composition comprising a first set of comonomer units and a second set of comonomer units, wherein the first set of comonomer units are propene, and wherein the second set of comonomer units are selected from the group consisting of ethylene, 1-hexene, 1-octene, and amorphous blocks and crystalline blocks;
- wherein the amorphous polyolefin composition comprises at least two amorphous polyolefin copolymers.
An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween, wherein the absorbent article further comprises a hot melt adhesive composition comprising:
- (i) from about 10 wt. % to about 90 wt. % of an amorphous polyolefin copolymer comprising at from about 30 mole % to about 70 mole % of 1-butene monomer units and a second C4-40 olefin polymer;
- and
- (ii) from about 10 wt. % to about 90 wt. % of a heterophase polyolefin copolymer composition comprising a first set of comonomer units and a second set of comonomer units, wherein the first set of comonomer units are propene, and wherein the second set of comonomer units are selected from the group consisting of ethylene, 1-hexene, 1-octene, and amorphous blocks and crystalline blocks.
An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween, wherein the absorbent article further comprises a hot melt adhesive composition comprising:
- (i) at least 10 wt. % of an amorphous polyolefin copolymer comprising (a) from about 30 mole % to about 70 mole % of 1-butene monomer units;
- and (b) a second C4-40 olefin polymer;
- and
- (ii) from about 0.05 wt. % to about 0.75 wt. % of an antioxidant;
- wherein the amorphous polyolefin copolymer has a viscosity from about 2000 mPa·s to about 8000 mPa·s when measured by ASTM D3236 at 190° C.;
- wherein the hot melt adhesive composition is substantially free of tackifier;
- and
- wherein the hot melt adhesive composition has a softening point from about 80° C. to 140° C. when measured using ASTM D 3461-97.
Dependencies are inferred from the claim text.