Term: resist polymer https://doi.org/10.1351/goldbook.RT07193 Definition: Polymeric material that, when irradiated, undergoes a marked change in solubility in a given solvent or is ablated. Notes: 0) A resist polymer under @I03255@ either forms patterns directly or undergoes chemical reactions leading to pattern formation after subsequent processing. 1) A resist material that is optimized for use with @UT07492@ or @VT07496@ light, an electron beam, an ion beam, or X-rays is called a @P04651@, electron-beam resist, ion-beam resist, or X-ray resist, respectively. 2) In a positive-tone resist, also called a positive resist, the material in the irradiated area not covered by a mask is removed, which results in an image with a pattern identical with that on the mask. In a negative-tone resist, also called a negative resist, the non-irradiated area is subsequently removed, which results in an image with a pattern that is the complement of that on the mask. Related Terms: 1) irradiation (http://doi.org/10.1351/goldbook.I03255). 2) ultraviolet (http://doi.org/10.1351/goldbook.UT07492). 3) visible (http://doi.org/10.1351/goldbook.VT07496). 4) photoresist (http://doi.org/10.1351/goldbook.P04651). 5) polymeric (http://doi.org/10.1351/goldbook.M03667). 6) solubility (http://doi.org/10.1351/goldbook.S05740). Source: PAC, 2004, 76, 889. 'Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003)' on page 903 (https://doi.org/10.1351/pac200476040889) Citation: 'resist polymer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.RT07193 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.