US5360845A
Expired / Lapsed
US
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Starch ester based hot melt adhesive
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1993-08-13
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Granted: 1994-11-01
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Expires: 2013-08-13
Abstract
Abstract Hot melt adhesive compositions comprising selected modified starch esters as the main or base adhesive material wherein the starch ester has an ester component of about 2 to 18 carbon atoms and a DS of from about 0.3 to 3.0 and a sufficient amount of a non-volatile, polar organic diluent to allow the composition to melt and have a viscosity of less than 50,000 cP at an application temperature of 400° F. or less.
Inventors
- 👤 Robert J. Billmers
- 👤 Charles W. Paul
- 👤 Stephen F. Hatfield
- 👤 Thomas F. Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
C; C09; C09J; C09J103/00; C09J103/04; C09J103/06
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
91 words
A hot melt adhesive composition comprising from about 10 to 80% by weight of a starch ester having from about 2 to 18 carbon atoms in the ester component and a degree of substitution (DS) of from about 0.3 to 3.0, and a diluent which is a non-volatile, polar organic material that is compatible with the starch ester and is present in sufficient amount to allow the composition to melt at an application temperature of 400° F. or less and have a viscosity of 50,000 cPs or less at that temperature.
Claim 2
Dependent Claim
91 words
A hot melt adhesive composition comprising from about 10 to 80% by weight of a starch ester having from about 2 to 18 carbon atoms in the ester component and a degree of substitution (DS) of from about 0.3 to 3.0, and a diluent which is a non-volatile, polar organic material that is compatible with the starch ester and is present in sufficient amount to allow the composition to melt at an application temperature of 400° F. or less and have a viscosity of 50,000 cPs or less at that temperature.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the starch ester has a DS of from about 0.7 to 2.4.
Claim 4
Dependent Claim
19 words
The composition of claim 2 wherein the starch ester contains 2 to 7 carbon atoms in the ester component.
Claim 5
Dependent Claim
56 words
The composition of claim 1 wherein the adhesive composition contains from about 20 to 90% by weight of the diluent, from about 0 to 35% by weight of a compatible hydrophilic or hydrophobic thermoplastic polymer, from about 0 to 70% by weight of a tackifier and from about 0 to 3% by weight of an antioxidant.
Claim 6
Dependent Claim
36 words
The composition of claim 4 wherein the starch ester has the formula: ##STR3## where St is the starch base material and R is an alkyl, aryl, alkenyl, alkaryl or aralkyl containing 1 to 17 carbon atoms.
Claim 7
Dependent Claim
18 words
The composition of claim 5 wherein the starch ester has a DS of from about 0.7 to 2.4.
Claim 8
Dependent Claim
24 words
The composition of claim 6 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms.
Claim 9
Dependent Claim
18 words
The composition of claim 5 wherein the starch ester has a DS of from about 0.8 to 1.5.
Claim 10
Dependent Claim
24 words
The composition of claim 8 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms.
Claim 11
Dependent Claim
16 words
The composition of claim 5 wherein the diluent contains a sulfonamide, alcohol, amide or ester group.
Claim 12
Dependent Claim
21 words
The composition of claim 5 wherein the diluent contains an alcohol group and absorbs low levels of moisture at high humidity.
Claim 13
Dependent Claim
19 words
The composition of claim 5 which contains less than about 2% by weight of moisture in the final composition.
Claim 14
Dependent Claim
22 words
The composition of claim 10 wherein the starch base material is high amylose starch having at least 65% by weight amylose content.
Claim 15
Dependent Claim
13 words
The composition of claim 10 wherein the starch base material is waxy maize.
Claim 16
Dependent Claim
27 words
The composition of claim 13 wherein the starch ester is an acetate, a propionate or a mixture thereof, or a starch containing both acetate and propionate groups.
Claim 17
Dependent Claim
13 words
The composition of claim 10 wherein the polymer contains a hydroxyl polar group.
Claim 18
Dependent Claim
16 words
The composition of claim 10 wherein the polymer is polyvinyl alcohol, ethylene/vinyl alcohol or hydroxypropyl cellulose.
Claim 19
Dependent Claim
29 words
The composition of claim 10 wherein the tackifier is a polar tackifier having a Ring and Ball softening point, as described by ASTM E-26, of greater than 60° C.
Claim 20
Dependent Claim
48 words
The composition of claim 5 wherein the starch is preswelled with a portion or all of the diluent used in the composition, or up to 35% by weight moisture based on the weight of starch, or a combination thereof, at a temperature of up to about 100° C.
Claim 21
Dependent Claim
22 words
The composition of claim 5 wherein the starch base material is high amylose starch having at least 65% by weight amylose content.
Claim 22
Dependent Claim
23 words
The composition of claim 5 wherein the starch ester is present in an amount of from about 20 to about 60% by weight.
Claim 23
Dependent Claim
18 words
The composition of claim 21 wherein the starch ester has a DS of from about 0.7 to 2.4.
Claim 24
Dependent Claim
24 words
The composition of claim 22 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms.
Claim 25
Dependent Claim
21 words
The composition of claim 23 wherein the diluent is present in an amount of from about 25 to 75% by weight.
Claim 26
Dependent Claim
18 words
The composition of claim 24 wherein the starch ester has a DS of from about 0.8 to 1.5.
Claim 27
Dependent Claim
19 words
The composition of claim 19 wherein the R group of the starch ester has 1 to 6 carbon atoms.
Claim 28
Dependent Claim
18 words
The composition of claim 26 wherein the starch ester has a DS of from about 0.3 to 2.0.
Claim 29
Dependent Claim
21 words
The composition of claim 27 wherein the diluent is present in an amount of from about 25 to 75% by weight.
Claim 30
Dependent Claim
27 words
The composition of claim 28 wherein the starch ester is an acetate, a propionate or a mixture thereof, or a starch containing both acetate and propionate groups.
Claim 31
Dependent Claim
61 words
A case and carton sealing hot melt adhesive composition comprising the composition of claim 5 wherein the starch ester contains an R group which is an alkyl of 1 to 6 carbon atoms and wherein the diluent further comprises from about 10 to 60% by weight of a plasticizer and from about 5 to 30% by weight of a wax material.
Claim 32
Dependent Claim
28 words
The composition of claim 30 wherein the adhesive has suitable water dispersibility making it useful for case and carton sealing applications requiring the use of a repulpable adhesive.
Claim 33
Dependent Claim
14 words
The composition of claim 30 which is biodegradable and is useful in composting applications.
Claim 34
Dependent Claim
62 words
An industrial bag sealing hot melt adhesive composition comprising the composition of claim 5 wherein the starch ester component contains an R group which is an alkyl group of 1 to 6 carbon atoms and wherein the diluent further comprises from about 10 to 60% by weight of a plasticizer and from about 5 to 30% by weight of a wax material.
Claim 35
Dependent Claim
62 words
A non-woven or disposable diaper hot melt adhesive composition comprising the composition of claim 5 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms and wherein the diluent further comprises from about 10 to 70% by weight of a plasticizer and from about 0 to 15% by weight of a wax material.
Claim 36
Dependent Claim
60 words
A bottle labelling hot melt adhesive composition comprising the composition of claim 5 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms and wherein the diluent further comprises from about 10 to 80% by weight of a plasticizer and from about 0 to 30% by weight of a wax material.
Claim 37
Dependent Claim
57 words
A bookbinding or padding adhesive composition comprising the composition of claim 5 wherein the starch ester contains an R group which is an alkyl group of 1 to 6 carbon atoms and wherein the diluent further comprises from about 10 to 70% by weight of a plasticizer and from about 0 to 35% of a wax material.
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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) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |