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Abstract
Experiments are described which show that the level of shrink-resistance conferred on wool by a silicone polymer can be improved by adding a small amount of polybutadiene and cobalt naphthenate catalyst to the formulation. The presence of the polybutadiene increases the adhesion between the polymer and the wool fibres, and this is thought to be responsible for the improved shrink-resistance. Thermal oxidation and cross-linking of polybutadiene occur readily in the presence of cobalt ions via free-radical reactions, which may well lead to grafting between the polymer and the wool. Such grafting would increase the adhesion of the polymer to the fibres.