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Repositionable Microsphere Adhesive
In 1968 Spencer Silver at 3M, trying to make a very strong adhesive, made the opposite: an acrylate that formed tiny tacky spheres and held only lightly. For years it had no product. In 1974 his colleague Art Fry coated it on bookmarks for his church hymnal so they would stay put without tearing the pages; the sticky note reached shops in 1980.
**US 3,691,140**, "Acrylate copolymer microspheres", Silver, filed 9. March 1970, granted 12. September 1972: "inherently tacky", elastomeric microspheres of an acrylate ester such as iso-octyl acrylate with a small share of an ionic monomer.
**You measure what makes it different from tape**: the peel force over twenty re-sticks, side by side with masking tape, and the spheres themselves under a microscope.
初学者
1 hour
说明
1
1
Look at the stripe
Look at the stripe
Put a sticky note's adhesive stripe under the digital microscope at high magnification. Beside it, a strip of masking tape. Capture both; measure the bead size and spacing on the note.
此步骤所需材料：
可重复粘贴的便签纸1 pad
美纹纸胶带1 卷所需工具：
数码显微镜2
2
Clean the glass
Clean the glass
Wipe a glass sheet with isopropyl alcohol and let it dry. Cut the masking tape to the same 25 mm width and 75 mm length as the note's sticky area.
此步骤所需材料：
99% 异丙醇10 毫升
厨房纸巾1 张所需工具：
玻璃板
剪刀
直尺3
3
Peel at 90 degrees
Peel at 90 degrees
Press the note and the tape onto the glass with one firm thumb stroke each. Clip a paper clip to each free end, hook the spring scale, and peel straight up, slowly. Record the steady force.
此步骤所需材料：
回形针2 个所需工具：
测力计（弹簧秤）4
4
Re-stick and repeat
Re-stick and repeat
Stick the same pieces down again in the same place and peel again. Record peel 1, 2, 5, 10 and 20.
所需工具：
测力计（弹簧秤）5
5
Peel ladder and contact area
Peel ladder and contact area
正在加载 Jupyter 笔记本…
6
6
History & Context
History & Context
**What the patent specifies:** inherently tacky, elastomeric, solvent-insoluble acrylate copolymer microspheres made by suspension polymerisation with an ionic comonomer. **Modern build (derived):** a commercial sticky-note pad, tested.
The same idea now holds repositionable labels, wall graphics and removable flags. Its limits: a weak grip by design, fading tack as dust and fibre collect on the spheres, and poor hold on rough or damp surfaces.
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