| 摘要 |
A process for improving the adhesion of an adhesive material to surface of a negatively charged or polar polymer is provided by treating the polymer surface with a solution of a vinylamine-containing polymer or a salt thereof prior to contacting the polymer surface with the adhesive material. The negative charge may be produced on polyolefins by treatment such as corona discharge, irradiation or treatment with chemicals such as acids, to produce an anionic surface. Substrates which may be coated include polypropylene, polyethylene, polyamides, polyvinylidene chloride, polyvinyl chloride, polyethylene terephthalate and cellulose derivatives. The polyvinylamine may be a homopolymer or a copolymer with polyvinyl alcohol. The adhesive material is an emulsion of natural rubber, styrene-butadiene, chloroprene, vinyl esters or acrylates. |
