| 摘要 |
<p>1,254,117. Vibration damping laminates. FARBWERKE HOECHST A.G. 3 Dec., 1968 [5 Dec., 1967], No. 57351/68. Heading B5N. [Also in Divisions B2 and C3] A vibration damping laminated system comprises two plates bonded together by an interlayer comprising a graft polymer of from 35 to 65% by weight, based on the weight of the graft polymer, of styrene or a mixture of styrene and from 0À1 to 10% by weight, based on the weight of styrene, of a copolymerizable carboxylic acid, or from 65 to 35% by weight, based on the weight of the graft polymer, of a copolymer containing from 10 to 30 parts by weight of units derived from vinyl acetate and from 70 to 90 parts by weight of units derived from ethylene, the total number of parts by weight of the various units in the copolymer being 100. The copolymerizable carboxylic acid may be acrylic, methacrylic or a mixture thereof and the plates may be of steel. The graft polymer may be applied to the plates by travelling, brushing or pouring at elevated temperature and the system is cooled under pressure between rollers, or a gel of the copolymer in styrene or the styrene/carboxylic acid mixture containing a polymerization initiator is applied between the plates and the resulting system is heated to form the graft polymer in situ.</p> |
