Articles of Thermoplastic Elastomeric Blends
Publication Date: 2016-Nov-08
The IP.com Prior Art Database
Peter W. Manders: AUTHOR [+3]
Many articles of manufacture require the use of materials of varying and different properties which cannot be fully met by current commercially available materials. Thermoplastic elastomers comprising impermeable thermoplastic resins and impermeable elastomers that can be used in new and varying applications is the topic of this work.
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ARTICLES OF THERMOPLASTIC ELASTOMERIC BLENDS
Abstract: Many articles of manufacture require the use of materials of varying and different properties which cannot be fully met by current commercially available materials. Thermoplastic elastomers comprising impermeable thermoplastic resins and impermeable elastomers that can be used in new and varying applications is the topic of this work.
Blends of olefin based thermoplastics and olefin based elastomers, commonly referred to as thermoplastic vulcanizates ("TPV") have been known and used for various uses wherein products are formed by extrusion and molding. Alternative low-permeability thermoplastic elastomeric compositions comprising a low permeability thermoplastic in which is dispersed an interfacially grafted and vulcanized low permeability rubber have been developed for use as innerliners in pneumatic tires and as air barrier layers in hoses and bladders; such compositions have been referred to as dynamically vulcanized alloys ("DVAs"). These DVAs are distinct from commercial TPVs due to the interfacial grafting between the thermoplastic and elastomer and the cured state of the elastomer. To date, such DVAs have been formulated, blended, and formed into films to address the unique, and sometimes opposing, characteristics required of a tire innerliner.
With variations in the mixing and formation of the DVA, such DVAs offer improved characteristics over known TPV materials, enabling manufacturers to improve articles used in manufacturing other articles and articles used directly by consumers.
Articles comprising DVA are useful wherein any one or any combination of the following properties is desirable: puncture resistance, impermeability, dimensional stability, a high coefficient of friction, and non-transparency. Application areas include polymer products and products having specific end-uses. Exemplary end uses include, but are not limited to, coated fabrics, protective external or internal films for pipes, cables, and hoses, repair sleeve
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material for hoses, medical bags for both medical materials and waste, conformable gloves, as well as liners for containers, tanks, bottles, pipes, chimneys and even coffins.
The DVA blend contains thermoplastic resin present in an amount ranging from about 10 to 95 wt%, preferably 20 to 70 wt%, based on the weight of the resin(s) and vulcanized elastomer. The elastomer is present in an amount ranging from about 5 to 90 wt%, preferably from about 30 to 80 wt%, based on the on the weight of the resin(s) and vulcanized elastomer. For elastomeric-rich blends, the amount of thermoplastic resin is in the range of 10 to 45 wt% and the elastomer is present in the amount of 55 to 90 wt% on the weight of the resin(s) and vulcanized elastomer. Preferred elastomers are low permeability elastomers including isobutylene-isoprene elastomers (conventionally known as butyl rubber), functionalized butyl rubber,...