Cellular pressure-sensitive adhesive product and method of making
AssigneeMinnesota Mining and Manufacturing Company
InventorsDonald L. Esmay, Gordon G. Johnson, George F. Vesley
Life of this patent
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Abstract
A cellular pressure-sensitive adhesive membrane comprising 15 to 85% voids that does not collapse after being briefly compressed, has remarkably good adhesion on contact with rough surfaces and remarkably good flexibility and conformability at sub-freezing temperatures.
Claims14
Pressure-sensitive adhesive product comprising a cellular pressure-sensitive adhesive membrane surrounding and thereby defining a multiplicity of small voids, contituting from 15% to 85% of the volume of said membrane,
- the cellular adhesive membrane, when compressed 2/3 of its void thickness and released after 30 seconds, being characterized by the feature that it experiences a recovery above the line 10 on FIG. 1 of the drawing within 60 seconds after release.
Method of making a pressure-sensitive adhesive product comprising the steps of
- (1) preparing a composition which has a viscosity in the rage of about 1000 to 40,000 cps and is polymerizable to a pressure-sensitive adhesive state,
- (2) frothing the composition,
- (3) coating the froth onto a backing, and
- (4) polymerizing the coated forth in situ to a pressure-sensitive adhesive state to provide a pressure-sensitive adhesive membrane having a cellular structure comprising 15% to 85% voids and possessing a high degree of compression recovery.
Method of making a pressure-sensitive adhesive product comprising the steps of
- (1) preparing a composition which has a viscosity in the range of about 1000 to 40,000 cps and is polymerizable to a pressure-sensitive adhesive state,
- (2) coating the composition onto a backing, and
- (3) simultaneously foaming and polymerizing the coating in situ to a pressure-sensitive adhesive state to provide a pressure-sensitive adhesive membrane having a cellular structure comprising 15% to 85% voids and possessing a high degree of compression recovery.
Dependencies are inferred from the claim text.