The present invention provides the use of a hollow particulate glass as a support for an active agent, characterised in that said hollow particulate glass is produced by pyrolysis of glass-coated polymer particles which are produced by copolymerising an unsaturated heterocyclic monomer and squaric acid,
wherein said polymer has the structure:
where each R, which may be the same or different, is hydrogen or optionally substituted alkyl; the ring nitrogen atom of the heterocyclic ring is unsubstituted or alkyl (especially methyl) substituted; X is a bond or a bridging group (preferably a bond); y is zero or a positive integer (preferably zero); and z is a positive integer the value whereof determines the molecular weight of the polymer.
本发明提供了一种中空微粒
玻璃作为活性剂载体的用途,其特征在于所述中空微粒
玻璃是通过热解
玻璃涂层聚合物颗粒而制成的,所述聚合物颗粒是由不饱和杂环单体和
方酸共聚而成、
其中所述聚合物具有以下结构:
其中每个 R(可以相同或不同)是氢或任选取代的烷基;杂环的环状氮原子是未取代的或取代的烷基(尤其是甲基);X 是键或桥基(最好是键);y 是零或正整数(最好是零);z 是正整数,其值决定聚合物的分子量。