专利名称：Hollow acid-free acrylate polymeric
microspheres having multiple small voids
发明人：Delgado, Joaquin, c/o Minnesota Mining and申请号：EP90313880.8申请日：19901219公开号：EP0444354B1公开日：19960508
摘要：Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble,solvent-dispersible, elastomeric, nitrogen-containing, acid-free pressure-sensitiveadhesive microspheres having an average diameter of at least about 1 micrometerwherein a majority of the microspheres contain multiple interior voids, a majority of thevoids having a diameter of less than about 10% of the diameter of the microsphere, thetotal of the diameters of the voids being at least about 10% of the diameter of themicrosphere. These hollow microspheres are useful as repositionable pressure-sensitiveadhesives. The invention also provides pressure-sensitive adhesives consisting essentiallyof such acid-free hollow microspheres. Aqueous suspensions of these microspheres,processes for their preparation, spray repositionable pressure-sensitive adhesivecompositions, and pressure-sensitive adhesive coated sheet materials are also provided.Surprisingly, hollow microspheres of the invention may be used in combination withdelicate substrates such as photographs without causing discoloration or damage, incomparison with prior art repositionable pressure-sensitive adhesives.
申请人：MINNESOTA MINING & MFG
地址：US
国籍：US
代理机构：Baillie, Iain Cameron
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