US4855382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linkable hot melt adhesive composition
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1988-08-03
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Granted: 1989-08-08
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Expires: 2008-08-03
Abstract
Abstract A hot melt adhesive contains a copolymer of at least 50 wt. % ethylene containing hydroxyl functionality having a melt viscosity of from 1 to 100 Pa.s at 180° C., an internally blocked polyisocyanate and a viscosity reducing agent such as a tackifier.
Inventors
- 👤 Gerard M. Vanhaeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C08G18/28; C08G18/40; C08G18/4009; C08G18/4063; C08G18/62; C08G18/6204; C08G18/6212; C09; C09J; C09J175/00; C09J175/04; C08G2170/00; C08G2170/20; C08L; C08L2666/00; C08L2666/02; C08L2666/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
42 words
A hot melt adhesive composition comprising: (a) a copolymer of at least 50 wt % ethylene containing hydroxyl functionality having a melt viscosity of from 1 to 100 Pa.s at 180° C. (b) an internally blocked polyisocyanate (c) a viscosity reducing component.
Claim 2
Dependent Claim
42 words
A hot melt adhesive composition comprising: (a) a copolymer of at least 50 wt % ethylene containing hydroxyl functionality having a melt viscosity of from 1 to 100 Pa.s at 180° C. (b) an internally blocked polyisocyanate (c) a viscosity reducing component.
Claim 3
Dependent Claim
31 words
Composition according to claim 1, wherein the copolymer is a polymer having monomeric units of vinyl alcohol and optionally vinyl acetate, the melt viscosity being preferably from 4 to 40 Pa.s.
Claim 4
Dependent Claim
24 words
Composition according to claim 1 wherein the internally blocked polyisocyanate has at least two uretdione groups and has no free isocyanate groups before unblocking.
Claim 5
Dependent Claim
14 words
Composition according to claim 3 wherein the internally blocked polyisocyanate is a cycloaliphatic polyisocyanate.
Claim 6
Dependent Claim
35 words
Composition according to claim 1 wherein the internally blocked diisocyanate has the general formula: ##STR5## wherein R, R' and R" are the same or different and R is cycloaliphatic and R' and R" are non-aromatic.
Claim 7
Dependent Claim
40 words
Composition according to claim 1 wherein the copolymer of ethylene is an ethylene vinyl acetate copolymer at least 50 wt % having a melt flow index of 10 to 2500 and comprises at least 5 wt. % vinyl alcohol units.
Claim 8
Dependent Claim
16 words
Composition according to claim 1 in which the viscosity reducing component is a non-crosslinking tackifying resin.
Claim 9
Dependent Claim
20 words
Composition according to claim 1 in which the viscosity reducing component contains at least two groups reactive with isocyanate groups.
Claim 10
Dependent Claim
21 words
The composition of claim 8 wherein said viscosity reducing component is selected from polyether polyols, polyester polyols, polyamines, and polyether amines.
Claim 11
Dependent Claim
25 words
A composition according to claim 8 wherein said viscosity reducing component is a polyether or polyester polyol of average molecular weight from 200 to 7000.
Claim 12
Dependent Claim
16 words
A composition according to claim 1 wherein the said viscosity reducing component is a polyoxypropylene triamine.
Claim 13
Dependent Claim
59 words
A composition according to claim 1 comprising 40 to 90 wt. % of said copolymer, 10 to 60 wt. % of said viscosity reducing component, and the internally blocked isocyanate in an amount so as to provide, upon activation by heat, from 0.1 to 1.0 mole of isocyanate per mole of function reactive with isocyanate in the adhesive formulation.
References Cited (Backward Citations)
US4263444A
Cited
US4609717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |