专利名称：Hollow acid-free acrylate polymeric
microspheres having multiple small voids
发明人：Joaquin Delgado申请号：US07/485630申请日：19900227公开号：US04968562A公开日：19901106
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 microspheres, 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-sensitive adhesives.The invention also provides pressure-sensitive adhesives consisting essentially of suchacid-free hollow microspheres. Aqueous suspensions of these microspheres, processesfor their preparation, spray repositionable pressure-sensitive adhesive compositions, andpressure- sensitive adhesive coated sheet materials are also provided. Surprisingly,hollow microspheres of the invention may be used in combination with delicate
substrates such as photographs without causing discoloration or damage, in comparisonwith prior art repositionable pressure-sensitive adhesives.
申请人：MINNESOTA MINING AND MANUFACTURING COMPANY
代理人：Donald M. Sell,Walter N. Kirn,Darla P. Neaveill
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