申请人:Huffman Brian S.
公开号:US08671871B2
公开(公告)日:2014-03-18
A temperature-activatable time-temperature indicator that can be used to monitor the historical exposure of a host product to ambient temperatures includes an optically readable, thermally sensitive indicator element. The indicator element can be inactive below a base temperature and is intrinsically thermally responsive at or above an activation temperature which is equal to or greater than the base temperature. The indicator can record cumulative ambient temperature exposure above the activation temperature irreversibly with respect to time. The indicator element can include a synthetic polymeric material, and optionally, a dye. A side-chain crystallizable polymer such as poly(hexadecylmethacrylate), that is solid below the base temperature and is a viscous liquid above the activation temperature can be employed. Intense indicator element colors can be obtained using an appropriate dye or dyes. Various structural configurations of indicator are described and illustrated.
一种温度可激活的时间-温度指示器可用于监测主机产品对环境温度的历史暴露情况,包括一个光学可读的、热敏感的指示器元件。指示器元件在基准温度以下可以处于不活性状态,并在等于或高于基准温度的激活温度处具有固有的热响应性。指示器可以记录累积的环境温度暴露,且该记录与时间无法逆转。指示器元件可以包括合成聚合物材料,可选地,还可以包括染料。可以使用侧链结晶聚合物,例如聚十六烷基甲基丙烯酸酯,该聚合物在基准温度以下为固体,在激活温度以上为粘稠液体。可以使用适当的染料或染料组合获得强烈的指示器元件颜色。描述和说明了各种指示器的结构配置。