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Improvements in or relating to adhesive compositions comprising polymerised chloroprene and in or relating to methods of preparing such compositions
Improvements in or relating to adhesive compositions comprising polymerised chloroprene and in or relating to methods of preparing such compositions
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机译：包含聚合氯丁二烯的粘合剂组合物或与之有关的改进以及与制备此类组合物的方法有关或与之有关的改进
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摘要
A liquid composition comprises chloroprene which has been polymerized only to the plastic state, an organic solvent and from 1 to 10 per cent by weight of the chloroprene of polyvinyl acetate which serves to increase the initial adhesive bond between two films of the composition. The chloroprene is dispersed in an organic solvent and the polyvinyl acetate, together with a curing agent for the chloroprene, are separately dispersed in an organic solvent, the two solutions or dispersions being mixed immediately before use; other compounding ingredients which do not promote the curing of the chloroprene may be incorporated in either of the solutions or dispersions. According to an example, chloroprene and phenyl-o-naphthylamine are dispersed in toluene diluted with ethyl acetate and naphtha and the polyvinyl acetate, zinc oxide and butyraldehyde-aniline condensation product are separately dispersed in toluene. Benzene, xylene and trichloroethylene are also referred to as suitable solvents. Specification 560,778 and U.S.A. Specification 1,950,436 are referred to.ALSO:A liquid adhesive composition comprises chloroprene which has been polymerized only to the plastic state, an organic solvent, and from 1 to 10 per cent by weight of the chloroprene of polyvinyl acetate which serves to increase the initial adhesive bond between two films of the composition. The chloroprene is dispersed in an organic solvent, and the polyvinyl acetate, together with a curing agent for the chloroprene, are separately dispersed in an organic solvent, the two solutions or dispersions being mixed immediately before use; other compounding ingredients which do not promote the curing of the chloroprene may be incorporated in either of the solutions or dispersions. The chloroprene is present in about 1/2 to 3 pounds per American gallon of the composition, and the polyvinyl acetate preferably amounts to approximately 3 per cent of the chloroprene. According to an example, chloroprene and phenyl-b -naphthylamine (a stabilizer and antioxidant) are dispersed in toluene diluted with ethyl acetate and naphtha, and the polyvinyl acetate, zinc oxide (curing-agent for the chloroprene), and butyraldehyde-aniline condensation product (accelerator) are separately dispersed in toluene. Benzene, xylene and trichlorethylene are also referred to as suitable solvents. Specification 560,778 and U.S.A. Specification 1,950,436 are referred to.
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