增塑剂
聚合物
材料科学
化学工程
涂层
水溶液
固化(化学)
聚结(物理)
流化床
分散稳定性
复合材料
有机化学
化学
物理
天体生物学
工程类
作者
B. Lippold,R Monells Pagés
出处
期刊:PubMed
日期:2001-01-01
卷期号:56 (1): 5-17
被引量:31
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.
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