| 摘要 |
1,252,805. Bonded aluminium sheets. BOSTIK Ltd. 21 Jan., 1969 [22 Jan., 1968; 1 July, 1968], No. 3439/69. Heading B5N. [Also in Division C3] Aluminium sheets are bonded together by means of a cured composition provided by the use of two heat fusible, coilable rods of substantially uniform cross-section and composition throughout their length, which are dry and non- tacky and sufficiently stiff to be pushed into the entrance port of a melting device. Each of the two rods comprises synthetic polymeric material having chemical groups which react with chemical groups present in the other rod. Predetermined lengths of the two rods are melted and mixed together to form the composition. Examples of suitable materials for pairs of rods are: (1) (a) a material containing epoxy groups and (b) a material, containing groups capable of reacting with or catalysing the polymerization of epoxy groups, e.g. a polyamide containing primary amino groups or a material containing tertiary amino groups. (2) (a) a material containing blocked isocyanate groups, and (b) a second material containing reactive hydrogen atoms capable of reacting with the isocyanate groups which are unblocked when the polymer is melted. A suitable apparatus for dispensing the rods is described in Specification 749,892. Examples relate to the use of both types of composition as set out above which were applied to preheated aluminium and the two substrates lightly pressed together, on cooling a strong bond was formed.
|
