Coating compositions suitable for application to optical surfaces to reduce surface misting and light reflection without creating haze comprise:
(a) an inorganic particulate component selected from colloidal silica particles, colloidal alumina particles, or a mixture thereof wherein the silica or alumina particles have a small particle size represented by an average particle size in the range 7 to 50 nm and the particles comprise 0.5 to 2.5% weight/volume of the total composition;
(b) another inorganic particulate component also selected from colloidal silica particles, colloidal alumina particles, or a mixture thereof wherein the silica and alumina particles have a large particle size represented by an average particle size in the range 75 to 150 nm and the particles comprise 0.2 to 1.0% weight/volume of the total composition;
(c) 0.1 to 1.0% weight/volume of a polymeric binder; and
(d) a volatile liquid medium.
The coating compositions provide especially beneficial properties when applied to thermoplastic films and sheets, -such as polyethylene terephthalate films. Such films are suitable as coverings or claddings for horticultural growing houses, cold frames and cloches.
包括适用于光学表面的涂层组合物,以减少表面雾化和光反射,同时不会产生雾气:
(a) 一种无机颗粒成分,选自胶体
二氧化硅颗粒、胶体氧化铝颗粒或它们的混合物,其中
二氧化硅或氧化铝颗粒的粒径较小,平均粒径在 7 至 50 纳米之间,颗粒占总组合物重量/体积的 0.5%至 2.5%;
(b) 另一种无机微粒组分,也选自胶体
二氧化硅微粒、胶体氧化铝微粒或它们的混合物,其中
二氧化硅和氧化铝微粒的粒径较大,平均粒径在 75 至 150 nm 之间,微粒占总组合物重量/体积的 0.2 至 1.0%;
(c) 0.1-1.0%重量/体积的聚合物粘合剂;以及
(d) 挥发性液体介质。
当涂料组合物用于热塑性薄膜和薄片(如聚
对苯二甲酸乙二醇酯薄膜)时,可提供特别有益的特性。此类薄膜适用于园艺种植房、冷棚和茧的覆盖或包覆。