Invention Grant
- Patent Title: Process for preparing a photochromic polymeric composition, thus obtained polymeric composition and use thereof
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Application No.: US13131441Application Date: 2009-11-20
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Publication No.: US08277700B2Publication Date: 2012-10-02
- Inventor: Zhengfeng Zhang , Wentian Lan
- Applicant: Zhengfeng Zhang , Wentian Lan
- Applicant Address: DE Darmstadt
- Assignee: Evonik Roehm GmbH
- Current Assignee: Evonik Roehm GmbH
- Current Assignee Address: DE Darmstadt
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: WOPCT/CN2008/073370 20081208
- International Application: PCT/EP2009/065545 WO 20091120
- International Announcement: WO2010/066555 WO 20100617
- Main IPC: G02B5/23
- IPC: G02B5/23 ; G02C7/02

Abstract:
The present invention discloses a process for preparing a photochromic polymeric composition, characterized in that the photochromic polymeric composition is prepared by comprising (meth)acrylamide compound in the reaction mixture useful for the preparation of the photochromic polymeric composition. The present invention also relates to the thus obtained polymeric composition, photochromic articles made from said polymeric composition, and use of said polymeric composition for preparing photochromic articles. The photochromic polymeric composition according to the present invention makes the absorption peak of the photochromic dye therein become longer, thus exhibiting a desired grey with a bit bluish green or grey with a bit blue.
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