Hot-melt composition that have good open time and form creep-resistant bonds when applied in thin layers
AssigneeMinnesota Mining and Manufacturing Company
InventorDennis D. Hansen
Life of this patent
Estimating the term…
Abstract
A hot-melt composition comprising an ethylene/vinyl acetate copolymer, an ethylene/n-butyl acrylate copolymer, and a tackifying resin can be spread into a thin layer that has a limited open time of at least 5 seconds. The composition eventually crystallizes to form a creep-resistant bond.
Claims41
A hot-melt composition comprising an ethylene/vinyl acetate copolymer having a melt index of at least 500 and comprising a total of 23% to 35% vinyl acetate, an ethylene/n-butyl acrylate copolymer, and a tackifying resin, wherein said composition has a limited open time of at least 5 seconds when deposited in a thin layer on a room temperature substrate.
An adhesive rod comprising a hot-melt composition which comprises
- (a) an ethylene/vinyl acetate copolymer having from 14% to 35% vinyl acetate and a melt index of at least 500,
- (b ) an ethylene/n-butyl acrylate copolymer having from 25% to 40% n-butyl acrylate, and
- (c) from 120 to 170 parts of a tackifying resin per 100 parts combined weight of (a)+(b), said tackifying resin having a ring and ball softening point of from 80.degree. C. to 120.degree. C. and a combined aromatic and olefinic content of at least 0.5 mole %
- wherein said hot-melt composition has a limited open time of at least 5 seconds when deposited on a room temperature substrate in a thin layer.
A hot-melt composition comprising an ethylene/vinyl acetate copolymer, an ethylene/n-butyl acrylate copolymer having a melt index of at least about 400, and a tackifying resin, wherein said composition has a limited open time of at least 5 seconds when deposited in a thin layer on a room temperature substrate.
An adhesive rod comprising a hot-melt composition which comprises
- (a) an ethylene/vinyl acetate copolymer having from 14% to 35% vinyl acetate,
- (b) an ethylene/n-butyl acrylate copolymer having from 25% to 40% n-butyl acrylate and a melt index of at least 400, and
- (c) from 120 to 170 parts of a tackifying resin per 100 parts combined weight of (a)+(b), said tackifying resin having a ring and ball softening point of from 80.degree. C. to 120.degree. C. and a combined aromatic and olefinic content of at least 0.5 mole %
- wherein said hot-melt composition has a limited open time of at least 5 seconds when deposited on a room temperature substrate in a thin layer.
A hot-melt composition comprising an ehtylene/vinyl acetate copolymer, an ethylene/n-butyl acrylate copolymer having from about 25% to 40% n-butyl acrylate, and a tackifying resin, wherein said composition has an open time of 5 seconds to about 135 seconds when deposited in a thin layer on a room temperature substrate.
Dependencies are inferred from the claim text.