Ben Welter - Tuesday, July 21, 2015
U.S. patent application 20150197679 (applicant Empire Technology Development LLC):
"Thermostatic packaging materials, and methods for making and using the materials are disclosed. The materials may include phase change materials that are covalently bound with the packaging material to avoid any leaching of liquefied phase change materials. The phase change materials may be copolymerized with hydrogels to provide an absorbent thermostatic material. ...
"Example 1 ... Thermostatic food packaging containers having a thermal buffering temperature of about 0° C. to about 4° C. will be produced. The containers will be made from styrene, in the form or styrene blocks of 50-200 styrene units, co-polymerized with lauryl acrylate, in the form of blocks of 50-200 lauryl acrylate units, and will have a styrene to lauryl acrylate ratio of about 1/9 to about 9/1. The copolymer will be press-molded into bowl-shaped containers. The containers will be fitted with lids of the same material to isolate and thermally insulate any contents placed therein."http://www.freepatentsonline.com/20150197679.pdf