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Non-crystalline (amorphous) plastics suffer from cold flow when placed under stress. This invention provides an additive which improves the cold flow resistance of amorphous plastics. The method involves introducing into the plastic a combination of (i) an acetal or ketal of an alditol and (ii) (a) a hydrocarbylated boric acid, (b) an organoaluminum compound, or (c) both a hydrocarbylated boric...