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AssigneeKimberly-Clark Worldwide, Inc.
InventorsTimothy J. Blenke, Peiguang Zhou
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The present invention is generally directed to adhesive compositions comprising selected ratios of crystalline and amorphous polymers. In some versions of the invention, polymers capable of existing in different configurations (e.g., a polymer such as polypropylene which can exist in an atactic, syndiotactic. or isotactic configuration) are used to prepare adhesives of the present invention. As an example, a selected amount of isotactic polypropylene is blended with a selected amount of atactic polypropylene to prepare an adhesive composition having one or more performance properties (e.g., bond strength) that are superior to the performance properties of a conventional hot-melt adhesive. The adhesive compositions of the present invention are suitable for use in the preparation of laminated disposable absorbent products.
A process for increasing the strength of a component of a laminated absorbent article, the process comprising increasing the material basis weight of the component by introducing a material basis weight increasing agent onto at least a portion of the component to increase the material basis weight of the treated portion of the component by at least about 10%, the material basis weight increasing agent comprising an atactic polymer and an isotactic polymer, the atactic polymer having a degree of crystallinity of less than about 20% and a number-average molecular weight of from about 1,000 to about 300,000 and the isotactic polymer having a degree of crystallinity of at least about 40% and a number-average molecular weight of from about 3,000 to about 200,000.
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A process for increasing the strength of a component of a laminated absorbent article, the process comprising increasing the material basis weight of the component by bonding a layer of material onto at least a portion of the component to increase the material basis weight of the treated portion of the component by at least about 10%, the layer of material being bonded to the component with an adhesive composition, the adhesive composition comprising an atactic polymer and an isotactic polymer, the atactic polymer having a degree of crystallinity of less than about 20% and a number-average molecular weight of from about 1,000 to about 300,000 and the isotactic polymer having a degree of crystallinity of at least about 40% and a number-average molecular weight of from about 3,000 to about 200,000.
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A process for increasing the strength of an ear attachment zone of a diaper, the process comprising increasing the material basis weight of the ear attachment zone by introducing a material basis weight increasing agent onto the ear attachment zone to increase the material basis weight of the ear attachment zone, the material basis weight increasing agent comprising an atactic polymer and an isotactic polymer, the atactic polymer having a degree of crystallinity of less than about 20% and a number-average molecular weight of from about 1,000 to about 300,000 and the isotactic polymer having a degree of crystallinity of at least about 40% and a number-average molecular weight of from about 3,000 to about 200,000.
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Dependencies are inferred from the claim text.