| 摘要 |
<p>Pressure-sensitive adhesive; based on elastomers such as natural rubber, e.g. crepe, or a synthetic rubber, e.g. a butadiene polymer or copolymer rubber or a polyisobutylene rubber, contain 1-10% of silica of particle size 0,01-0,03 micron. The adhesives may contain a tackifier, e.g. a disproportionated rosin or a hydrogenated rosin ester, a plasticizer, e.g. lanoline, a naphthenic petroleum oil or polyisobutylene of mol. wt. 2000, a filler, e.g. white clay or calcium carbonate, an antioxidant for the elastomer, e.g. zinc dibutyl dithiocarbamate. Examples are of formulations of natural rubber, disproportionated rosin, silica, lanoline, titanium dioxide and zinc oxide, zinc dibutyl dithiocarbamate, and maize starch. Specifications 711,562 and 711,586 are referred to.</p> |
