簡介
光敏感 pigments 是指光響應 colorants 或類似顏料的材料，其光學性質在暴露於輻射（最常見為紫外線）時會改變。在工業塑膠和 coatings 中，該詞通常指 光致變色 pigments、染料和微膠囊系統，這些材料會可逆地改變顏色；而在生物學中，它也可以更廣泛地指吸收光並發生化學變化的光色素和視覺 pigments。
在塑膠價值鏈中，光敏感 pigments 介於裝飾性 colorants 與 functional additives 之間，佔據專門利基。它們用於製造 變色消費產品、安全特徵、智慧標籤、coatings、油墨和模塑零件，通常以有機分子或混合系統形式配製，以承受混煉、加工和重複光循環。其發展受光化學、微膠囊技術和聚合物相容 masterbatch 設計的進展影響，而永續性討論則聚焦於耐久性、微膠囊化學、添加劑複雜性，以及彩色多層產品的有限可回收性。
本文主要聚焦於光敏感 pigments 在塑膠及相關助劑中的工業意義，同時提及該詞在光色素和光感受系統中的科學根源。
歷史與發展
光敏感性的科學基礎源自早期的光化學和視覺研究，研究人員發現 pigments 在吸收光後會改變結構。在生物學中，經典例子是視紫紅質，光吸收會觸發發色團的異構化及下游訊號級聯。
工業用光致變色 colorants 發展較晚，驅動因素包括眼鏡、新奇商品、安全印刷和特種 coatings 對可逆變色的需求。隨著塑膠加工擴展，製造商將這些材料調整用於射出成型、擠出和 masterbatch 生產，這需要更好的熱穩定性以及與聚烯烴、苯乙烯系、PVC 和工程聚合物的相容性。近期發展強調 微膠囊化、改善耐光性，以及與水性與溶劑型油墨、塗料系統和聚合物基質的更廣泛相容性。
化學結構與關鍵特性
工業用光敏感 pigments 並非單一化學類別。它們包括 光致變色染料、微膠囊化 pigments 以及相關發色系統，這些系統在光暴露下會發生可逆結構變化。常見分子基序包括螺噁嗪、螺吡喃和萘并吡喃，它們在閉環（通常無色）狀態與開環（有色）狀態之間轉換；此變化改變共軛模式，進而改變可見光吸收光譜。
關鍵特性包括：
- 可逆變色：在紫外線或陽光暴露下發生，通常伴隨熱或暗處回復。
- 光譜選擇性：顏料對特定波長帶有反應，而非對所有光同等反應。
- 加工相容性：特別是當以微膠囊或 masterbatch 形式供應時，適用於塑膠。
- 對加工熱與剪切的敏感性：若超過配方限制，可能導致性能下降。
主要技術限制與實務因應方式：
- 熱敏感性 → 熔融加工時分子降解 → 使用較低溫度混煉、後添加母粒或微膠囊化以保護活性發色團。
- 紫外線暴露疲勞 → 重複循環後切換幅度降低 → 使用穩定劑套件、保護面漆或降低添加量配方以延長使用壽命。
- 厚或高顏料系統中透明度控制有限 → 光散射與遮蔽降低活化效果 → 使用透明或半透明樹脂，並將光致變色系統置於表面附近。
- 不適合高度著色或碳黑填充塑膠 → 可見光無法有效到達發色團 → 選擇淺色基材或採用表面塗層而非整體著色。
典型工業用量範例為 0.8–3% 光致變色顏料加入透明或半透明塑膠模塑化合物中，確切添加量取決於目標顏色深度、切換速度與樹脂透明度。在 coatings 和油墨中，通常使用較高添加量，因為顏料位於表面附近，無需穿透整體材料。
參考文獻
- •
Photopigment. (2004, December 2). Wikipedia. https://en.wikipedia.org/wiki/PhotopigmentLink
- •
Photopigment - an overview. (n.d.). ScienceDirect. https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/photopigmentLink
- •
感光色素. (2025, August 30). 維基百科. https://zh.wikipedia.org/zh-hk/%E6%84%9F%E5%85%89%E8%89%B2%E7%B4%A0Link
- •
感光色素. (2025, August 30). 维基百科. https://zh.wikipedia.org/zh/%E6%84%9F%E5%85%89%E8%89%B2%E7%B4%A0Link
- •
Visual pigment - an overview. (2022, October 12). ScienceDirect. https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/visual-pigmentLink
- •
What is a photo pigment? (2020). ScienceLine. http://scienceline.ucsb.edu/getkey.php?key=812Link
- •
What are photopigments? (2026, March 2). Kidspattern. https://www.kidspattern.com/learn/what-are-photopigments/Link
- •
Microencapsulated photosensitive inks. (n.d.). IPS Industrial. https://ips-industrial.it/en/microencapsulated-products/capsular-ink/microencapsulated-photosensitive-inks/Link
- •
The relationship between photosynthetic pigments and light absorption. (n.d.). Atophort. https://www.atophort.com/news/the-relationship-between-photosynthetic-pigments-and-light-absorption.htmlLink
- •
Photopigment. (2025, October 13). ArabPsych. https://scales.arabpsychology.com/trm/photopigment/Link
- •
Photochromic pigment. (2023, July 24). Photoluminescentcn. https://www.photoluminescentcn.com/product/photochromic-pigment/Link
- •
Sun reactive photochromic UV pigment powder. (2017, April 29). SFXC. https://www.sfxc.co.uk/products/sfxc-photochromic-sun-sensitive-reversible-pigmentLink
- •
Photosensitivity. (n.d.). Freeman. http://bcs.whfreeman.com/webpub/biology/sadavalife9e/animated%20tutorials/life9e_4602_script.htmlLink
- •
George Wald - Nobel lecture. (n.d.). UCI Physics. https://www.physics.uci.edu/~tritz/senses/wald-lecture.pdfLink
- •
Photopigment. (n.d.). Weblio. https://ejje.weblio.jp/content/photopigmentLink
- •
Introduction to how pigments work. (2024, October 1). Nature Friend Magazine. https://naturefriendmagazine.com/introduction-to-how-pigments-work/Link
- •
Important! Two major effects of 730nm far-red LEDs on plants growth. (2018, October 27). Medium. https://medium.com/@sinjialighting/important-two-major-effects-of-730nm-far-red-leds-on-plants-growth-52d2681477baLink
- •
Rod and cone visual pigments and phototransduction. (2011, November 10). PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC3265844/Link
- •
Discover all about photochromic materials. (2021, September 10). OliKrom. https://www.olikrom.com/en/blog-olikrom/the-expert-eye/all-about-photochromic-materials/Link
- •
Fabrication and characterization of color photosensitive. (n.d.). J-STAGE. https://www.jstage.jst.go.jp/article/photopolymer/25/4/25_409/_pdfLink
- •
Definition of photopigments. (2024, November 1). The Free Dictionary. https://medical-dictionary.thefreedictionary.com/photopigmentsLink
- •
Molecular genetics of color vision and color vision defects. (2000, May 1). JAMA Ophthalmology. https://jamanetwork.com/journals/jamaophthalmology/fullarticle/413200Link
- •
Photopigment - an overview. (n.d.). ScienceDirect. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/photopigmentLink
- •
UCSB science line. (n.d.). UCSB. http://scienceline.ucsb.edu/getkey.php?key=813Link
- •
28.8: Chemistry of vision. (2014, November 26). LibreTexts. https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Basic_Principles_of_Organic_Chemistry_(Roberts_and_Caserio)/28:_Photochemistry/28.08:_Chemistry_of_VisionLink
- •
Visual pigment - an overview. (n.d.). ScienceDirect. https://www.sciencedirect.com/topics/medicine-and-dentistry/visual-pigmentLink
- •
Definition of iodopsins. (2024, August 5). Merriam-Webster. https://www.merriam-webster.com/dictionary/iodopsinsLink
- •
Azo dyes having improved solubility in organic solvent. (n.d.). EPO. https://data.epo.org/publication-server/rest/v1.0/publication-dates/19911002/patents/EP0449650NWA2/document.pdfLink
- •
SFXC® photochromic sun sensitive reversible pigment - orange. (2019, June 11). SFXC. https://www.sfxc.co.uk/products/sfxc-orange-photochromic-pigmentLink
- •
Photochromic pigment uses – Ranbar green GS4010. (n.d.). Ranbar. https://ranbarr.com/products/photochromic-pigment-uses-gs4010/Link
- •
Iodopsin definition and meaning. (n.d.). Collins. https://www.collinsdictionary.com/dictionary/english/iodopsinLink
- •
High performance photochromic pigments, inks and paints. (2023, July 21). OliKrom. https://www.olikrom.com/en/photochromic-materials/Link
- •
Mammalian photoreceptors use sunlight to rapidly regenerate visual pigments. (2017, May 4). UCLA Newsroom. https://newsroom.ucla.edu/releases/mammalian-photoreceptors-use-sunlight-to-rapidly-regenerate-visual-pigmentsLink
- •
Photosynthesis, chloroplast. (n.d.). Nature. https://www.nature.com/scitable/topicpage/photosynthetic-cells-14025371/Link
- •
Basic visual chemistry. (n.d.). UPenn. https://www.sas.upenn.edu/~scottds/vision/vischem.htmLink
- •
How photosynthetic pigments harvest light. (2017, January 11). MIT News. https://news.mit.edu/2017/photosynthetic-pigments-harvest-light-artificial-photosynthesis-0111Link
- •
Wavelengths of light and photosynthetic pigments. (2025, July 17). Khan Academy. https://www.khanacademy.org/science/biology/photosynthesis-in-plants/the-light-dependent-reactions-of-photosynthesis/a/light-and-photosynthetic-pigmentsLink
- •
Photopigment. (2025, June 24). Britannica. https://www.britannica.com/science/photopigmentLink
- •
Photosynthetic pigments. (n.d.). Passel. https://passel2.unl.edu/view/lesson/920a6340a995/2Link
- •
Pigments based photosensitizers. (2018, September 1). Science.gov. https://www.science.gov/topicpages/p/pigments+based+photosensitizersLink
- •
Photochromic pigment uses. (2024, June 18). KingChroma. https://www.kingchroma.com/example-of-pigments-uses/photochromic-pigment-usesLink
- •
Photosensitive dye – Ranbar gray DP0080. (2024, February 1). Ranbar. https://ranbarr.com/products/photosensitive-dye-dp0080/Link
- •
How photochromic pigment works and its use in various industries. (2023, March 29). Photochromicpigments. https://photochromicpigments.com/blog/how-photochromic-pigment-works-and-its-use-in-various-industries/Link
- •
Pigment and colored photosensitive composition. (n.d.). EPO. https://data.epo.org/publication-server/rest/v1.2/publication-dates/20130731/patents/EP2620476NWA1/document.pdfLink
- •
ELI5: How does photosensitivity work chemically. (2020, November 22). Reddit. https://www.reddit.com/r/explainlikeimfive/comments/jz04sg/eli5_how_does_photosensitivity_work_chemically/Link
- •
Visual pigment. (1998, July 20). Britannica. https://www.britannica.com/science/visual-pigmentLink
- •
Light sensitive dye – Ranbar blue DP5060. (2024, January 31). Ranbar. https://ranbarr.com/products/light-sensitive-dye-dp5060/Link
- •
Phototransduction in rods and cones. (2018, July 30). NCBI. https://www.ncbi.nlm.nih.gov/books/NBK52768/Link
- •
Top 7 applications of photochromic pigment in industry. (2026, July 7). Insilico Materials. https://insilico-materials.com/photochromic-pigment-applications/Link
- •
Photosensitive & thermosensitive pigments. (2026, March 27). VD Glass. https://vdglass.it/en/customization/photosensitive-and-thermosensitive-pigments/Link
- •
Photosensitive dyes. (n.d.). Ranbar. https://ranbarr.com/product/color-changing-pigment/photochromic-dyes/Link
- •
What are the innovative applications of photochromic pigments? (2025, June 6). Yayang Global. https://www.yayangglobal.com/what-are-the-innovative-applications-of-photochromic-pigments/Link
- •
How does temperature-sensitive pigment work. (2026, July 22). Nichwell Chem. https://nichwellchem.com/how-does-temperature-sensitive-pigment-work/Link
- •
Photochromic pigments applications and benefits. (2019, December 25). Colour Changing Pigment. https://colourchangingpigment.com/blogs/news/photochromic-pigments-applications-and-benefitsLink
- •
Role of visual pigment properties in rod and cone. (2003, October 2). PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC2581816/Link
- •
Photosensitive materials and their applications. (2025, July 24). SAMaterials. https://www.samaterials.com/blog/photosensitive-materials-and-their-applications.htmlLink
- •
Pigment. (2022, September 1). EBSCO. https://www.ebsco.com/research-starters/chemistry/pigmentLink