Packaged hot-melt pressure sensitive adhesive
AssigneeH.B. Fuller Company
InventorsPeter Remmers, Dirk Laukien, Lynne Purvis, Nicholas Porro, Nicholas Taylor
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Abstract
The present invention relates to a packaged hot-melt pressure sensitive adhesive comprising a hot-melt pressure sensitive adhesive composition and a coextrusion coating consisting of neat low density polyethylene, neat polypropylene, or neat ethylene vinyl acetate. The present invention further relates to the use of the packaged adhesive formed as individual forms in an adhesive application process, and the use of the packaged adhesive in the production of laminated articles, including nonwoven hygiene articles, disposable medical drapes, and also laminate constructions such as tapes and labels.
Claims19
A packaged-hot-melt pressure sensitive adhesive comprising a plurality of individual forms, the individual forms comprising:
- (a) a hot-melt pressure sensitive adhesive composition, and
- (b) a coextrusion coating consisting of neat low-density polyethylene, neat polypropylene or neat ethylene vinyl acetate, wherein the neat low-density polyethylene, neat polypropylene or neat ethylene vinyl acetate has a melt flow index between about 20 g/10 min and about 300 g/10 min (ASTM D1238-190° C., 2.16 kgs) and
- wherein the individual forms are
- obtained by a coextrusion process, wherein the coextrusion process comprises:
- i. providing one or more hot-melt components and blending the hot-melt components to form the hot-melt pressure sensitive adhesive composition,
- ii. providing the coextrusion coating,
- iii. coextruding both the hot melt pressure sensitive adhesive composition and the coextrusion coating such that the hot melt pressure sensitive adhesive composition forms a strand substantially surrounded by the coextrusion coating,
- iv. optionally cutting the resulting, coated strand of hot melt pressure senstive adhesive,
- v. solidifying the individual forms.
A coextruded packaged hot-melt pressure sensitive adhesive, obtained by a process wherein the hot-melt pressure sensitive adhesive composition (a) is pumped through a coextrusion head and wherein the coextrusion coating (b) is added to the adhesive composition (a) such that the coextrusion coating (b) substantially covers the adhesive composition (a) as a cover sheet and;
- wherein the hot-melt pressure sensitive adhesive composition has an average penetration number (PZ), which is between about 20 and about 70.
Dependencies are inferred from the claim text.