# US 2013/0156067 A1 · Temperature management member under reduced-pressure atmosphere and temperature management method under reduced-pressure atmosphere > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156067 A1 - Document ID: US20130156067A1 - Status: Published application - Kind: A1 - Application number: 13/818,491 - Filed: 2011-07-22 - Published: 2013-06-20 - Earliest claimed: 2010-08-26 - Assignees: Nichiyu Giken Kogyo Co., Ltd. - Inventors: Ryuji Furue - Web page: https://patentgrep.com/patent/US20130156067A1 ## CPC - G01K 11/12: using changes in colour, translucency or reflectance - G01K 11/06: using melting, freezing, or softening - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) ## Abstract A temperature management member under a reduced-pressure atmosphere, wherein the difference in the discoloration temperature of a temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under a reduced-pressure atmosphere can be minimized. A temperature management member under a reduced-pressure atmosphere includes a temperature-sensitive discoloration layer which contains granular or powdery hot-melt matter that melts at a melting temperature corresponding to a heating temperature to be detected under a reduced-pressure atmosphere and which is discolored in response to the hot melting thereof, and a difference in the melting temperature of the hot-melt matter within the temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under the reduced-pressure atmosphere is 5° C. at most. ## Claims ### Claim 1 A temperature management member under a reduced-pressure atmosphere comprising: a temperature-sensitive discoloration layer which contains a granular or powdery hot-melt matter that melts at a melting temperature corresponding to a heating temperature to be detected under a reduced-pressure atmosphere and which discolors in response to the hot melting of the hot-melt matter, wherein a difference in the melting temperature of the hot-melt matter within the temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under a reduced-pressure atmosphere is 5° C. at most. ### Claim 2 (depends on 1) The temperature management member under a reduced-pressure atmosphere according to claim 1, wherein the difference in the melting temperature of the hot-melt matter within the temperature-sensitive discoloration layer between under the atmospheric pressure atmosphere and under the reduce-pressure atmosphere of 1000 Pa or 0.1 Pa is 2° C. at most. ### Claim 3 (depends on 1) The temperature management member under a reduced-pressure atmosphere according to claim 1, wherein the temperature-sensitive discoloration layer comprises: a hot-melt matter layer containing granular or powdery hot-melt matter; and a substrate, on one surface side of which the hot-melt matter layer is configured, the temperature-sensitive discoloration layer discolors in response to the hot melting of the hot-melt matter, by the hot-melt matter layer becoming transparent and accordingly a surface of the substrate being visually recognized, and/or by the granular or powdery hot-melt matter dissolved with a pigment that coexists therewith. ### Claim 4 (depends on 1) The temperature management member under a reduced-pressure atmosphere according to claim 1, wherein the hot-melt matter is a eutectic mixture which comprises at least two kinds of hot-melt matters each having a different melting point. ### Claim 5 (depends on 4) The temperature management member under a reduced-pressure atmosphere according to claim 4, wherein the eutectic mixture comprises at least two kinds of the hot-melt matters each having a different melting point, one of the hot-melt matter in the eutectic mixture which has the lowest melting point is contained in the range of 50-90 parts by weight, and another one of the hot-melt matter in the eutectic mixture which has the highest melting point is contained in the range of 50-10 parts by weight. ### Claim 6 (depends on 1) The temperature management member under a reduced-pressure atmosphere according to claim 1, wherein the hot-melt matter is an aliphatic compound having at least a carbon number of 3 or a benzophenone compound. ### Claim 7 (depends on 6) The temperature management member under a reduced-pressure atmosphere according to claim 6, wherein the aliphatic compound is at least any one of a compound selected from the group consisting of a fatty acid compound, a fatty acid amide compound and a fatty acid dihydrazide compound. ### Claim 8 A temperature management method under a reduced-pressure atmosphere comprising steps of: making a temperature-sensitive discoloration layer containing a granular or powdery hot-melt matter that melts at a melting temperature corresponding to a heating temperature to be detected under a reduced pressure; adjusting a difference in a melting temperature of the hot-melt matter in the temperature-sensitive discoloration layer, between under an atmospheric pressure atmosphere and under a reduced-pressure atmosphere, to be 5° C. at most thereby; preparing the temperature management member under the reduced-pressure atmosphere by arranging a temperature-sensitive discoloration layer which discolors in response to the hot melting, on a substrate thereby; heating the temperature management member together with the object to be heated at the time of heating the object to be heated under a reduced-pressure atmosphere; and managing a history that shows whether or not the heating temperature to heat the object to be heated reaches at a temperature to be detected, by checking the discoloration of the temperature-sensitive discoloration layer of the temperature management member.