| 摘要 |
1,136,544. Photochemical cross-linking of polymers. GEVAERT-AGFA N.V. 6 Feb., 1967 [28 Feb., 1966], No. 8728/66. Headings C3B, C3P and C3R. [Also in Division G2] A process for the photochemical crosslinking of a light-sensitive composition comprises exposing to actinic light rays a composition comprising (A) a polymer carrying pendant groups which are reactive with products deriving from the photochemical decomposition of quinone diazide groups, and (B) a polymer carrying chemically combined quinone diazide groups which may or may not be the same as (A). Preferably (B) is the same as (A) and is a polymer having pendant hydroxyl groups, which hydroxyl groups have been partially reacted with a quinone diazide containing chlorosulphinyl or chlorocarbonyl groups. The examples relate to reacting the polyether of 2,2 - bis - (4 - hydroxy - phenyl) - propane and epichlorohydrin with naphthoquinone-1,2-diazide - (2) - 5 - sulphochloride or naphthoquinone - 1,2 - diazide - (2) - 4 - sulphochloride and exposing to actinic light, these polymers may be further hardened using known methods for epoxy resins. The examples also relate to the reaction of the two quinone diazides above with a partial polyvinyl butyral containing a substantial proportion of free hydroxyl groups. |
