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Vistamaxx™ Propylene-based Elastomers in Filler Loaded Polymer

IP.com Disclosure Number: IPCOM000235654D
Publication Date: 2014-Mar-18
Document File: 3 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

Vistamaxx™ propylene-based elastomer (PBE) has a unique crystalline morphology and very low crystallinity relative to other polyolefin materials. The relatively high amorphous content and structure of Vistamaxx™ PBE enables a distinct ability to improve the melt elasticity for enhanced spinnability / draw ability in the spunbond nonwovens processes while retaining key properties such as tensile and elongation. Described herein is the use of Vistamaxx™ PBE in mineral filled polypropylene resins for spunbond applications such as hygiene and medical fabrics.

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Vistamaxx™ Propylene-based Elastomers in Filler Loaded Polymer

Abstract: Vistamaxx™ propylene-based elastomer (PBE) has a unique crystalline morphology and very low crystallinity relative to other polyolefin materials. The relatively high amorphous content and structure of Vistamaxx™ PBE enables a distinct ability to improve the melt elasticity for enhanced spinnability / draw ability in the spunbond nonwovens processes while retaining key properties such as tensile and elongation. Described herein is the use of Vistamaxx™ PBE in mineral filled polypropylene resins for spunbond applications such as hygiene and medical fabrics.

Background

Mineral fillers, such as calcium carbonate (CaCO3), are often added to polypropylene resins at high percentages (10-50 weight%) for low end spunbond applications such as disposable fabrics, shopper bags, rice packaging, sofa packaging, furniture packaging, and other industrial packaging applications. The high loading of the mineral filler allows for decreased production costs for the nonwoven fabric as the fillers are generally less costly than the polymers that go into the nonwoven fabric.

One of key challenges for mineral filled polypropylene in spunbond applications is a significant drop in tensile properties. Another challenge is the processability (specifically spinnability) of the filled polypropylene resins in commercial spunbond lines due to a drop in melt strength. These two challenges limit the expansion of filled polypropylene into higher value spunbond applications such as hygiene (8-20 gsm) and medical (35-70 gsm) fabrics. Another potential issue with filled polypropylene fabrics is the "rough" surface of the fabric due to the incorporation of high levels of filler.

Vistamaxx™ PBE is compatible with many polymers and can be utilized to develop optimized solutions for targeted applications and performance in polypropylene-based nonwoven fabrics. One application is the use of Vistamaxx™ PBE in mineral filled polypropylene to improve the melt elasticity for enhanced spinnability / draw ability in spunbond process while retaining key physical properties. Vistamaxx™ PBE may be added to mineral filled polypropylene for spunbond applications both as neat and as part of a mineral masterbatch for improved performance.

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