发明公开
EP1272695A1 METHOD OF MAKING A POLYPROPYLENE FABRIC HAVING HIGH STRAIN RATE ELONGATION AND METHOD OF USING THE SAME 审中-公开
工艺生产具有高产量和速度要求比较高断裂应变的物质聚丙烯

METHOD OF MAKING A POLYPROPYLENE FABRIC HAVING HIGH STRAIN RATE ELONGATION AND METHOD OF USING THE SAME
摘要:
This invention relates to a method of making a film-fabric composite (including a film-fabric laminate) wherein the fabric is characterized as having improved tensile elongation (without rupture). In particular, the invention pertains to a method of making a film-fabric laminate having structural elastic-like behavior wherein the fabric is a nonwoven thermally bonded fabric characterized as having improved high strain rate tensile elongation and comprises a plurality of fibers comprised of at least one polypropylene polymer and at least one ethylene polymer, wherein the method comprises stretching the laminate at a high strain rate. The improved fabric is characterized by higher high strain rate tensile properties and a broader bond window which is also shifted to substantially lower temperatures with regard to maximum tensile properties. The improved fabric enables higher stretching levels or speeds on stretching apparati often employed to impart elasticity or elastic-like behavior to inelastic polymeric materials. Polypropylene copolymers as well as polypropylene homopolymers may be used in the invention which is useful for durable and disposable articles such as diapers, bandages, pantiliners, continence pads, and sanitary napkins.
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