| 摘要 |
1,211,601. Adhesive tapes. BEIFRSDORF A.G. 31 Oct., 1968 [31 Oct., 1967], No. 51617/ 68. Heading B2E. [Also in Division C3] Self-adhesive tapes and foils have a pressuresensitive adhesive layer obtained by applying to a flexible base a liquid or viscous coating of a composition comprising (1) a low molecular weight copolymer having a K-value of 20-40 formed from (a) 85-99.95 parts of (i) one or more acrylic acid alkyl esters, the primary or secondary alcohol component having 4-12 carbon atoms or (ii) a mixture of the acrylic acid alkyl ester or esters with up to 50% of another comonomer which is a vinyl ester, a vinyl ether, a low acrylic acid ester, methacrylic acid alkyl ester, acrylonitrile, methacrylonitrile, methylene glutaric nitrile or a mixture of these and (b) 0.05-15 parts of one or more comonomers which, in addition to a polymerisable double bond, contain one or more reactive groups and (2) mixed therewith, a small quantity of catalyst and/or a polyfunctional compound, the composition being free or nearly free of solvent and subjecting the coating to a short heat treatment, for example 60-150‹C. for 2-20 minutes. Numerous suitable comonomers for 1(b) are listed. Adhesive tapes may have an anti-adhesive coating on the reverse side or may be provided with a silicone coated release paper. The base may be foils of plastics or modified natural substances, paper, fabrics, fleece, metal foils, metallised plastics foils, asbestos and glass fibre fabrics. |
