Schwingungsgedaempfte Verbundsysteme mit Zwischenschichten aus Pfropfpolymerisaten von Styrol oder Styrol/Acrylsaeure auf Vinylacetat/n-Butylacrylat/Dibutylmaleinat/Crotonsaeure-Copolymerisaten

摘要

1,246,996. Vibration damping laminates. FARBWERKE HOECHST A.G. 4 Dec., 1968 [ 6 Dec., 1967], No. 57603/68. Heading B5N. [Also in Divisions B2 and C3] A vibration damping laminated system comprises two plates, e.g. of metal such as steel, bonded together with an interlayer comprising a graft polymer of 40-80% by weight of styrene or a mixture thereof with 0À1-10% by weight based on the styrene of a copolymerizable carboxylic acid, e.g. acrylic and/or methacrylic acid, an 60-20% by weight of a copolymer of 30-40% by weight of vinyl acetate, 30-40% by weight of n-butyl acrylate, 10-30% by weight of di-n-butyl maleate and 5-15% by weight of a copolymerizable unsaturated carboxylic acid, e.g. crotonic acid. The graft polymer may be cross-linked with a compound containing a plurality of epoxide or isocyanate groups. The graft polymer may contain minor amounts of fillers, e.g. heavy spar, silicic acid, graphite, soot or a mixture thereof, and one or more plasticizers. The total thickness of the laminated system may be 1-6 mm., the thickness of the interlayer being 0À1-1 mm. and the ratio of the thickness of the plates being from 1 : 1 to 4 : 1. The graft polymer may be applied to the plates by trowelling, brushing or pouring at an elevated temperature and the system cooled under pressure between rollers. A solution of the copolymer in styrene or styrene and acrylic and/or methacrylic acid mixture containing a polymerization initiator, e.g. tertiary butyl hydroperoxide may be applied between the plates and the laminated system subjected to heating at 60-180‹ C. to effect grafting.