| 摘要 |
Novel aqueous correction fluids comprise a stable emulsion of a water- dispersed, water-insoluble acrylic resin as the binder for the masking pigment. The compositions form smooth, receptive, highly opaque, non-brittle masking coatings and have an acceptable drying time due to the fact that the water content is as low as 25 to 50% of the total weight of the composition. The acrylic binder constitutes more than 10% by weight of the correction fluid and has such a high pigment binding power that it provides, on drying, pigment- air interfaces (without loss of film integrity) which, due to the large differences in refractive index between air and pigment, produce a much more opaque coating than is possible with other resin binder systems. As a result, up to half of the masking pigment content can be replaced by less expensive fillers while still providing acceptable opacity. |
