发明授权
- 专利标题: Hollow acrylate polymer microspheres
- 专利标题(中): 中空丙烯酸酯聚合物微球
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申请号: US276767申请日: 1988-11-30
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公开(公告)号: US5045569A公开(公告)日: 1991-09-03
- 发明人: Joaquin Delgado
- 申请人: Joaquin Delgado
- 申请人地址: MN St. Paul
- 专利权人: Minnesota Mining and Manufacturing Company
- 当前专利权人: Minnesota Mining and Manufacturing Company
- 当前专利权人地址: MN St. Paul
- 主分类号: C08J3/16
- IPC分类号: C08J3/16 ; C08F2/00 ; C08F2/24 ; C08F20/10 ; C08L33/00 ; C08L33/04 ; C09J133/00 ; C09J133/04 ; C09J133/06
摘要:
Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric pressure-sensitive adhesive microspheres having an average diameter of at least about 1 micrometer. Preferred microspheres are those wherein a majority of the hollow microspheres contain at least one of interior void having a diamter of at least 10% of the diameter of the microsphere.These hollow microspheres are useful as repositionable pressure-sensitive adhesives. The invention also provides pressure-sensitive adhesives consisting essentially of such hollow microspheres. Aqueous suspensions of these microspheres, processes for their preparation, spray repositionable pressure-sensitive adhesive compositions, and microsphere-coated sheet materials are also provided. Surprisingly, hollow microspheres of the invention show reduced or even eliminated adhesive transfer, in comparison with prior art repositionable pressure-sensitive adhesives which are based on solid microspheres.
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