Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1996-04-29
1998-03-10
Davis, Jenna
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428355AC, 428355N, C09J 702
Patent
active
057259470
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to film composites comprising a thin, flexible backing having one or more adhesive layers thereon, and to the use of the film composites on substrates exposed to organic solvents and, in particular, to petroleum fuel vapors or petroleum fuel or oil spillage.
BACKGROUND OF THE INVENTION
Film composites comprising a thin, flexible, optionally printable, backing having a layer of a pressure sensitive adhesive thereon, such as a polyacrylate based pressure sensitive adhesive material, can be used for the preparation of prefabricated graphics. The graphic appears on the side of the backing having no adhesive, by printing means such as screen-printing or other known printing techniques, and the film composite is subsequently adhered to the substrate.
When adhering these films onto substrates which are frequently or occasionally exposed to petroleum fuel vapor or petroleum fuel or oil spillage (such as onto gasoline or diesel pumps, cars, trucks or tank trucks), failure of the film composites is often observed due to edge lifting and/or swelling of the adhesive layer which results in delamination of the film composite from the substrate. Since delamination starts at the exposed edge of the film, one could protect the edges by using transparent sealing materials such as, for example, Scotchcal.TM. 3950 material (commercially available through Minnesota Mining and Manufacturing Company of St. Paul, Minn., U.S.A., "3M") or by transparent overlaminate constructions using, for example, Scotchcal.TM. 3640-114 film (commercially available through 3M). These solutions are, however, considered to be less attractive from an aesthetic point of view. Also application of edge protection requires an additional step of work consuming time and money.
Scotchcal.TM. 3650 film composites (commercially available through 3M, St. Paul, U.S.A.) which comprise a crosslinked acrylate copolymer on a primed polyvinyl-chloride backing, are characterized by a good chemical resistance. Presently they are frequently used for substrates exposed to petroleum fuel vapors or petroleum fuel or oil spillage. While the general chemical resistance of the film and its bulk resistance against diesel vapors, diesel spillage and oil, in particular, are excellent, film lifting has been observed occasionally when the films were exposed to petroleum spillage or to an atmosphere heavily loaded with petroleum vapors.
In the literature, pressure sensitive adhesives are described which among other properties are reported to exhibit an improved resistance against oil or gasoline.
JP 69-027,159 describes a film comprising, for example, a polyvinylchloride backing carrying a pressure sensitive adhesive consisting of 100 parts by weight era copolymer containing 85-99 wt. % of an acrylic acid ester and 0.2-15 wt. % of (meth)acrylic acid or ethyleneglycol mono(meth)acrylate, and up to 10 parts by weight era crosslinking component. The film is characterized as having improved oil-resistance.
JP 02-145,670 proposes pressure sensitive adhesive tapes, the edges of which are coated with a composition comprising methyl hydrogen silicone oil, a salt of Zn, Sn or Zr, an alkaline compound and a halogenation agent in order to increase resistance to gasoline and solvents.
U.S. Pat. No. 4,994,538 describes a siliconized emulsion based pressure sensitive adhesive comprising at least one reactive silicone acrylate polymer, one or more unsaturated carboxylic acids and one or more alkyl soft acrylates. The adhesive is characterized as gasoline resistant and having specific adhesion to automotive paints. A similar adhesive is described also in U.S. Pat. No. 5,234,736.
EP 0,552,917 reports fuel and solvent resistance for a fluoro silicone pressure sensitive adhesive comprising 5-70 wt. % of fluorosilicone polymers, 10-60 wt. % of siloxane copolymer resins containing silanol, and 10-50 wt. % of compatible diorganosiloxane polymers.
When being applied to gasoline or diesel pumps, tank trucks, and the like, film composites comprising a laye
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Coates Richard W.
Johannsen Heiner
Davis Jenna
Griswold Gary L.
Hornickel John H.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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