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Microbubble-filled article such as a pressure-sensitive adhesive tape
| Details |
Inventors: Vesley, George F.; Paulson, Alan H.;
Assignee: Minnesota Mining and Manufacturing Company (Saint Paul, MN)
Primary Examiner: Lesmes; George F.
Assistant Examiner: Schwartz; P. R.
Attorney, Agent or Firm: Sell; Donald M., Smith; James A., Brink; Richard E.
The invention primarily concerns a pressure-sensitive adhesive tape, the adhesive layer of which is filled with glass microbubbles and has a dark appearance by virtue of (1) the microbubbles are stained glass which preferably is dark, and (2) dispersed throughout the adhesive layer is a pigment or dye which preferably is dark. More broadly, the invention concerns any coherent article filled with stained-glass microbubbles. The glass of the microbubbles preferably has an ultraviolet window, permitting the article to be made by photopolymerizing a matrix filled with the microbubbles. |
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DETAILED DESCRIPTION We claim: 1.
Pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer consisting essentially of an acrylic polymer of acrylic acid of nontertiary alcohol, the molecules of which have from 1-14 carbon atoms, at least a major proportion of said molecules having a carbon-to-carbon chain of 4-12 carbon atoms terminating at the hydroxyl oxygen atom, said chain containing at least about one-half the total number of carbon atoms in the molecule, said acrylic acid ester being per se polymerizable to a stickly, stretchable elastic adhesive matrix and glass microbubbles of an average density not exceeding 1.
0 g/cc, which microbubbles are dispersed throughout and comprise at least 5% by volume of the adhesive layer, wherein the improvement comprises: the microbubbles are stained glass containing colored metal oxides, said microbubbles having an average diameter of from 5 to 200 micrometers, and dispersed throughout the adhesive matrix is a pigment or dye comprising from 0.
04 to 0.
12% by weight of the adhesive matrix.
2.
Presure-sensitive adhesive tape as defined in claim 1 having a flexible backing sheet which has a low-adhesion surface from which the pressure-sensitive adhesive layer is readily removable.
3.
Pressure-sensitive adhesive tape as defined in claim 2 wherein said pressure-sensitive adhesive layer has a cellular pressure-sensitive adhesive matrix.
4.
Pressure-sensitive adhesive tape as defined in claim 2 wherein the uncoated face of the backing sheet has a low-adhesion surface, and the tape is wound upon itself in roll form.
5.
Pressure-sensitive adhesive tape as defined in claim 2 including an unfilled pressure-sensitive adhesive layer on its exposed face.
6.
Pressure-sensitive adhesive tape as defined in claim 5 including an unfilled pressure-sensitive adhesive layer on both faces of its microbubble-filled adhesive layer.
7.
Pressure-sensitive adhesive tape as defined in claim 2 wherein the average density of the stained-glass microbubbles is less than 0
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