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| The Need - To develop thermoplastic alloy compositions with improved thermoformability. These could replace plasticized PVC and eliminate problems due to migration of the plasticizer resulting in embrittlement and deposit of plasticizer over surfaces. Polyolefin/ionomer blends may have problems with lack of adequate scuff resistance and deficiency in softness. These deficiencies have been overcome in part by using blends based on polypropylene/ethylene copolymer ionomer resins/ethylene glycidyl acrylate or methacrylate copolymer and an uncrosslinked ethylene propylene rubber. The latter compositions, however, still do not have the desired thermoformability. The Invention - Thermoplastic polymer alloy compositions are disclosed having an improved ability to thermoform articles having deep draw ratios, especially when embossing. Greater depth of embossing before andafter thermoforming (grain retention) is obtained. This is achieved through the use of a multi-component blend consisting of polypropylene, an uncrosslinked EPDM rubber, an ionomer containing an alkyl acrylate “softening” comonomer, an ethylene glycidyl methacrylate (or acrylate) copolymer, polypropylene grafted with maleic anhydride, a crosslinking agent such as triethanolamine and a poly alpha olefin such as linear low density polyethylene grafted with maleic anhydride. Compatibilizing Features - We are dealing here with a blend whose components all have an ethylene backbone - hence the basic compatibility. Improvement - Capable of being thermoformed at high draw ratios with fewer defects compared with controls.relates thermoplastic polymer alloy compositions thermoformable thermoformed articles |
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