| 摘要 |
The present invention provides a humidity buffer formulation comprising a water-swellable, water-insoluble polymer and a mixture of (1) a non-volatile hydrophilic liquid and (2) water. By adjusting the relative proportions of (1) and (2) in the mixture, the relative humidity maintained by the humidity buffer formulation in a sealed container can be varied. The invention also relates to methods of maintaining the relative humidity in a sealed container at a predetermined level and to a container containing the humidity buffer formulation of the present invention. In preferred forms the humidity buffer formulation includes a hydrophilic fibrous material, which enables the humidity buffer formulation to be produced as free-flowing granules. In a further preferred form the humidity buffer formulation is prepared in the form of a sheet. |
