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This invention describes a specific way to create a special powdered material, called a "pseudo master batch." This powder is made by mixing a liquid containing an additive, like a color-changing chemical, with plastic ingredients, and then quickly drying it. This unique powder can then be easily added to plastics to make everyday items, such as disposable cutlery or containers, change color based on temperature or light. The claims specifically focus on this method of making the powder, rather than the final product itself.
Why it matters: The cost and stability of thermochromic and photochromic compounds have likely improved since 2017. This makes their integration into disposable products via this master batch method more economically viable and reliable for applications like temperature indication in food service.
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