Hot-melt adhesvies for bonding polyethylene
AssigneeEastman Kodak Company
InventorsMax F. Meyer, Jr., Richard L. McConnell, Frederick B. Joyner
Life of this patent
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Abstract
The hot-melt adhesives of the present invention comprise a blend of poly(propylene-co-higher 1-olefin), tackifying resin and crystalline propylene containing polymer. These hot-melt adhesive compositions have a novel combination of properties including strong T-peel and lap shear bonds to both low- and high-density polyethylene with excellent creep resistance at ambient temperatures. Therefore, these new hot-melt adhesives are excellent adhesives for applications such as sealing high-density polyethylene grocery bags and low-density shipping bags.
Claims8
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of
- (1) 35 to 88 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190.degree. C.,
- (2) 10 to 50 weight percent of at least one tackifying resin having a softening point of at least 100.degree. C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and
- (3) 2 to 15 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190.degree. C.
An adhesive composition capable of being used as a hot-melt adhesive comprising a blend of
- (1) 48 to 67 weight percent substantially amorphous poly(propylene-co-higher 1-olefin), in which the 1-olefin is a member of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene, having a melt viscosity of about 10,000 to about 200,000 cp. at 190.degree. C.,
- (2) 25 to 40 weight percent of at least one tackifying resin having a softening point of at least 100.degree. C. selected from the group consisting of hydrocarbon resins, polyterpene resins, and rosin esters, and
- (3) 8 to 12 weight percent crystalline polypropylene or crystalline propylene/ethylene copolymers containing not more than 20 percent by weight ethylene, said polypropylene or propylene/ethylene copolymer having a melt viscosity of about 100 to 100,000 cp. at 190.degree. C.
Dependencies are inferred from the claim text.