| 摘要 |
1283713 Laminates TRW Inc 20 June 1969 [20 June 1968] 31406/69 Heading B5N [Also in Divisions C3 and D1] Reinforcing material impregnated with a prepolymer curable to a polyimide, as claimed in Specification 1,243,643 is made by forming the prepolymer (which is itself the subject of Specification 1,241,445) in situ by impregnating the reinforcing material with a solution obtained by dissolving a polyamine, a dianhydride and a monoanhydride in an organic solvent, and heating the impregnated material to form the prepolymer. Specified reinforcing materials are glass fibre mats, carbon, metal powders or filaments, silicates, asbestos, synthetic or natural fibres and metal oxide powders. |
