| 摘要 |
<p>1388489 Coated products WACKER-CHEMIE GmbH 13 April 1972 [20 April 1971] 17102/72 Heading B2E [Also in Division C3] Coatings which repel sticky substances to different degrees are provided on both sides of a glassine paper web by first coating one side using the indirect gravure printing process with a solution in an organic solvent of an OH-terminated dimethylpolysiloxane having a Brabender plasticity of 600 mKg, a methylhydrogenpolysiloxane end blocked with trimethylsiloxy groups of viscosity 40cS at 25‹C, the copolymeric reaction product of 1.99 pbw of an OH-terminated dimethylpolysiloxane and 1.0 pbw of N-beta-aminoethyl-gamma-aminopropyl-trimethoxysilane, and dibutyl tin diacetate. The coated paper is dried and cured in a hot air tunnel. The other side of the paper is then provided with a coating with a lesser degree of repellency of sticky substances than the first side by a knife-coating process using the same coating solution as above except that in place of the said dimethylpolysiloxane there is used an OH-terminated copolymer comprising 83 mol% of dimethylsiloxane units and 17 mol% of diphenylsiloxane units. The coating is cured as above. A pressure-sensitive adhesive coating is then applied to this latter coating and comprises a solution of a copolymer of vinyl acetate and vinyl laurate, an acid wax and a polyadipate. The solvent is then evaporated and the coated paper wound up in a roll.</p> |
