作者: Tzuli J. C O Minnesota Mining And Huang
DOI:
关键词: Layer (electronics) 、 Dispersion (chemistry) 、 Materials science 、 Polyurethane 、 Comonomer 、 Polyvinyl chloride 、 Coating 、 Wetting 、 Polymer 、 Composite material
摘要: Retroreflective sheeting has been improved by a coating comprising silica and transparent polymer selected from aliphatic polyurethanes, polyvinyl chloride copolymers having minor amount of comonomer containing at least one carboxylic acid or hydroxyl moiety, acrylic polymers. Silica comprises 10-80 weight percent (10-70% in the case polyacrylates) protective coating. For example, solution dispersion polyurethane is mixed with sol possibly other ingredients (e.g. wetting agent, UV light absorber adhesion promoter), composition coated onto retroreflective sheet dried. The superior soil dew repellancy, retaining higher percentage original brightness after exposure to dirt and/or conditions.