US4874804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt adhesives based on ethylene-n-butyl acrylate
Assignee: Ingredion Inc
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Filing: 1988-08-24
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Granted: 1989-10-17
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Expires: 2008-08-24
Abstract
Abstract Hot melt packaging adhesive compositions consisting essentially of 35 to 45% 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 50; 35 to 55% of a terpene phenolic tackifier; and 10 to 20% 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.
Inventors
- 👤 Francis X. Brady
- 👤 Thomas F. Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J165/00; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/14; C08L2666/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
Hot melt adhesive compositions consisting essentially of: (a) 35 to 45% 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 50; (b) 35 to 55% of a terpene phenolic tackifier having a Ring and Ball softening point of at least about 110° C.; and (c) 10 to 20% by weight of a polyethylene or Fischer-Tropsch synthetic wax having a melting point above about 100° C.; said adhesive characterized by a viscosity of less than 4000 cps at 175° C., fiber tearing bonds from Kraft paper within the complete range of -18° C. to 70° C., a Ring and Ball softening point of 105°-115° C., a cloud point less than 120° C., clarity at 175° C. and less than a 10% viscosity change after 72 hours at 175° C. with no char, skinning or gel formation.
Claim 2
Dependent Claim
150 words
Hot melt adhesive compositions consisting essentially of: (a) 35 to 45% 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 50; (b) 35 to 55% of a terpene phenolic tackifier having a Ring and Ball softening point of at least about 110° C.; and (c) 10 to 20% by weight of a polyethylene or Fischer-Tropsch synthetic wax having a melting point above about 100° C.; said adhesive characterized by a viscosity of less than 4000 cps at 175° C., fiber tearing bonds from Kraft paper within the complete range of -18° C. to 70° C., a Ring and Ball softening point of 105°-115° C., a cloud point less than 120° C., clarity at 175° C. and less than a 10% viscosity change after 72 hours at 175° C. with no char, skinning or gel formation.
Claim 3
Dependent Claim
15 words
The adhesive of claim 1 wherein the ethylene/n-butyl acrylate copolymer contains about 30% n-butyl acrylate.
Claim 4
Dependent Claim
18 words
The adhesive of claim 1 wherein the ethylene/n-butyl acrylate copolymer has a melt index between 100 and 400.
Claim 5
Dependent Claim
22 words
The adhesive of claim 1 wherein the tackifying resin has a Ring and Ball softening point of at least about 125° C.
Claim 6
Dependent Claim
27 words
The adhesive of claim 1 wherein the tackifying resin is a phenolic modified terpene resin having a Ring and Ball softening point of at least 125° C.
Claim 7
Dependent Claim
18 words
The adhesive of claim 1 wherein the wax is a synthetic, high density, low molecular weight polyethylene wax.
Claim 8
Dependent Claim
30 words
The adhesive of claim 1 containing a blend of an ethylene/n-butyl acrylate copolymer having a melt index of 45 and an ethylene/n-butyl acrylate copolymer having a melt index of 400.
Claim 9
Dependent Claim
59 words
The adhesive of claim 1 consisting essentially of a blend of an ethylene/n-butyl acrylate copolymer having a melt index of 45 and an ethylene/n-butyl acrylate copolymer having a melt index of 400; a phenolic modified terpene resin having a Ring and Ball softening point of at least 125° C. and a synthetic, high density, low molecular weight polyethylene wax.
Claim 10
Dependent Claim
38 words
The hot melt adhesive of claim 1 wherein there is additionally present 0.1 to 1.5% stabilizer selected from the group consisting of 1,3,5-trimethyl 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene; pentaerythrityl tetrakis-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; n-octadecyl-3(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate; 4,4'-methylenebis (2,6-tert-butylphenol); 4,4'-thiobis (6-tert-butyl-o-cresol); 2,6-di-tertbutylphenol; 6-(4-hydroxyphenoxy)-2,4-bis(n-octyl-thio)-1,3,5triazine; di-n-octylthio)ethyl 3,5-di-tert-butyl-4-hydroxy-benzoate; and sorbitol hexa[3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate].
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |