申请人:Champion International Corporation
公开号:US04239646A1
公开(公告)日:1980-12-16
Microspheric opacifying agents are provided by admixing an aqueous, partially condensed, aldehyde condensation product with an oily material containing an emulsifying agent thereby forming a water-in-oil emulsion, admixing an amphiphilic acid catalyst with the emulsion and polymerizing the condensation product to form discrete, substantially spherical, opaque, solid particles. Additionally, the solid particles may be separated from the oily continuous phase and admixed with water for the further removal of oily material, and thereby causing the formation of spherical agglomerates or "super particles" having a substantially greater opacity than the aforesaid discrete particles. The super particles are hollow, substantially spherical particles having substantially spherical, discontinuous walls composed of agglomerated substantially spherical particles.
通过将水性部分缩聚醛缩合物与含有乳化剂的油性材料混合,形成水-油乳液,然后将两者与两亲酸催化剂混合,聚合缩合物以形成离散的、基本球形的、不透明的固体颗粒,从而提供微球状的混浊剂。此外,可以将固体颗粒从油性连续相中分离出来,并与水混合,以进一步去除油性物质,从而形成球状聚集体或“超级颗粒”,其不透明度比上述离散颗粒显著更高。超级颗粒是空心的、基本球形的颗粒,其不连续壁由聚集的基本球形颗粒组成。