Adhesive and Coating Composition for Polyvinyl Chloride Resins

1,199,702. Polyvinyl chloride laminates. FARBENFABRIKEN BAYER A.G. 27 Jan., 1969 [2 Feb., 1969], No. 4409/69. Heading B5N. [Also in Division C3] Plasticized polyvinyl chloride may be bonded to itself or to another material by employing a composition comprising a mixture of a polyisocyanate and a hydroxyl-containing polyester which is liquid at 20‹ C. and has been obtained from an alkane diol which is free from ether groups and contains at least 3 carbon atoms, an alkane polyol having at least 3 hydroxyl groups, and an alkane dicarboxylic acid containing at least six carbon atoms, the alkane diol, alkane polyol and alkane dicarboxylic acid each having a M.W. below 500, and at least two different alkane diols or two different alkane dicarboxylic acids being used to form the polyester. In various examples polyvinyl chloride is bonded to itself and to a filled synthetic rubber and to a commercial leather. The alkane diol may be butane- 1 ,4-diol, pentane-1,5-diol, hexane-1,6- diol, butane-1,3-diol and/or 2,2-dimethylpropane-1,3-diol, the alkane polyol may be 1,1,1- trimethylolpropane, hexane-1,2,6-triol and/or glycerol and the alkane dicarboxylic acid may be adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid and/or 2,2,4-trimethyl adipic acid. Conventional polyisocyanates, especially those obtained by phosgenation of an anilineformaldehyde condensation product, or carbodiimide modified polyisocyanates of the diphenylmethane series may be used, especially in a solvent-free condition. The isocyanate and polyester components may be used in a precondensed form.