Hot melt adhesive
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsDaniel Stauffer, Paul P. Puletti, Thomas F. Kauffman
Life of this patent
Estimating the term…
Abstract
Hot melt packaging adhesive compositions consisting essentially of 20 to 50% by weight of an ethylene n-butyl acrylate copolymer containing 25-45% by weight, preferably 30 to 40% n-butyl acrylate and having a melt index of at least 10; 30 to 60% of an aliphatic or cycloaliphatic hydrocarbon resin or hydrogenated derivative thereof or a hydrogenated aromatic hydrocarbon resin; and 10 to 30% by weight of a high melting synthetic wax provide adhesives characterized by an excellent balance of high and low temperature performance without sacrifice to machinability or thermal stability. Further, the adhesive is characterized by a low density and consequently is readily filterable in recycling systems.
Claims18
A carton, case or tray formed utilizing a hot melt adhesive composition having a specific gravity less than 0.98 and a viscosity less than 8000 cps at 175.degree. C., said adhesive consisting essentially of:
- a) 20 to 50% by weight of at least one ethylene n-butyl acrylate copolymer containing 25-45% by weight n-butyl acrylate and having a melt index of at least 10;
- b) 30 to 60% of a tackifying resin selected from the group consisting of aliphatic and cycloaliphatic hydrocarbon resins or hydrogenated derivatives thereof and hydrogenated aromatic hydrocarbon resins;
- c) 10 to 30% by weight of a synthetic wax having a melting point above 100.degree. C.;
- and
- d) 0-1.5% stabilizer.
Hot melt adhesive compositions having a specific gravity less than 0.98, said adhesive consisting essentially of:
- a) 20 to 50% by weight of at least one ethylene n-butyl acrylate copolymer containing 25-45% by weight n-butyl acrylate and having a melt index of at least 10;
- b) 30 to 60% of a tackifying resin selected from the group consisting of aliphatic and cycloaliphatic hydrocarbon resins or hydrogenated derivatives thereof and hydrogenated aromatic hydrocarbon resins;
- c) 10 to 30% by weight of a synthetic wax having a melting point above 100.degree. C.;
- and
- d) 0-1.5% stabilizer;
- said adhesive characterized by a viscosity of less than 8000 cps at 175.degree. C., fiber tearing bonds from Kraft paper within the range of 0.degree. to 160.degree. F., a Ring and Ball softening point of 100.degree.-130.degree. C., a cloud point less than 140.degree. C., clarity at 170.degree. C. and being capable of surviving a 144 hour covered thermal stability test for 144 hours with no char, skinning or gel formation.
Dependencies are inferred from the claim text.