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Film formation, reproducibility of production and curing with respect to release stability of functional coatings from aqueous polymer dispersions.

机译:就功能性涂料从水性聚合物分散体中的释放稳定性而言,成膜,生产和固化的可再现性。

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摘要

The formation of film coatings from aqueous polymer dispersions is a complex process, highly dependent on additives and process parameters. Release instability of modified release coatings from aqueous polymer dispersions is a frequently described problem that hinders the general application of such dispersions. However, if some important prerequisites are fulfilled, storage stability should be achievable. Most important are: (a) The appropriate plasticizing time has to be considered, incorporating sparingly soluble plasticizers in the dispersion. (b) Necessary pore formers increase the permeability of the coating to a desired and constant extent only if they are compatible with the polymer. (c) Coating in the fluidized bed at or slightly above the minimum film forming temperature may lead to only incomplete film formation. Curing at higher temperatures improves the polymer particles coalescence to a physically stable state. Other stability aspects such as physical and chemical aging, migration of plasticizers and drugs and incompatibilities are also discussed.
机译:由水性聚合物分散体形成膜涂层是复杂的过程,高度依赖于添加剂和工艺参数。改性释放涂层从水性聚合物分散体中的释放不稳定性是经常描述的问题,其阻碍了此类分散体的普遍应用。但是,如果满足一些重要的先决条件,则应该可以实现存储稳定性。最重要的是:(a)必须考虑适当的增塑时间,在分散液中加入微溶增塑剂。 (b)仅当成孔剂与聚合物相容时,它们才可以将涂层的渗透性提高到所需的恒定程度。 (c)在流化床中以最低成膜温度或略高于最低成膜温度进行涂层可能只会导致不完全的成膜。在较高温度下的固化将聚合物颗粒聚结到物理稳定状态。还讨论了其他稳定性方面,例如物理和化学老化,增塑剂和药物的迁移以及不相容性。

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