US4911960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminating adhesive for film/paper microwavable products
Assignee: Ingredion Inc
•
Filing: 1988-01-19
•
Granted: 1990-03-27
•
Expires: 2008-01-19
Abstract
Abstract Wet laminating adhesives capable of withstanding the stresses encountered during heat sealing operations are prepared from emulsion copolymers consisting essentially of 45 to 80% by weight of a vinyl ester of an alkanoic acid, 10 to 30% ethylene, 5 to 30% of dialkyl maleate, 0.5 to 2% of an N-methylol containing comonomer and 0.5 to 4% of an ethylenically unsaturated mono- or di-carboxylic acid. These specific emulsion copolymers are prepared utilizing standard emulsion polymerization procedures with hydroxyethylcellulose or polyvinyl alcohol as a protective colloid. The emulsion polymers thus produced provide superior wet laminating adhesive properties for use in substrates which are to be formed into microwavable packages or bags.
Inventors
- 👤 Paul R. Mudge
- 👤 James L. Walker
- 👤 Terence M. Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F210/00; C08F210/02; C08F218/08; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F220/52; C08F220/54; C08F220/58; C08F222/00; C08F222/10; C08F222/12; C08F222/14; C08F222/145; C09; C09J; C09J131/00; C09J131/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1307; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31786; Y10T428/3179; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
148 words
A laminate suitable for use in the construction of microwavable packages or bags comprising a substrate selected from the group consisting of polyolefins, polyesters, polyamides, vinyl and vinylidene polymers, paper and modified cellulose bonded to the same or a dissimilar substrate with a wet laminating adhesive prepared from an emulsion copolymer having a Tg of 0° to -30° C. and consisting essentially of 45 to 80% by weight of a vinyl ester of an alkanoic acid having one to 13 carbon atoms; 10 to 30% ethylene; 5 to 30% of a dialkyl (C 4 -C 8 ) maleate; 0.5 to 2% of an N-methylol containing comonomer; 0.5 to 4% of an ethylenically unsaturated mono- or di-carboxylic acid; 0.2 to 3% of a stabilizer and 0 to 1% of a polyunsaturated copolymerizable monomer, which emulsion has been prepared in water using hydroxyethylcellulose or polyvinyl alcohol as the protective colloid.
Claim 2
Dependent Claim
148 words
A laminate suitable for use in the construction of microwavable packages or bags comprising a substrate selected from the group consisting of polyolefins, polyesters, polyamides, vinyl and vinylidene polymers, paper and modified cellulose bonded to the same or a dissimilar substrate with a wet laminating adhesive prepared from an emulsion copolymer having a Tg of 0° to -30° C. and consisting essentially of 45 to 80% by weight of a vinyl ester of an alkanoic acid having one to 13 carbon atoms; 10 to 30% ethylene; 5 to 30% of a dialkyl (C 4 -C 8 ) maleate; 0.5 to 2% of an N-methylol containing comonomer; 0.5 to 4% of an ethylenically unsaturated mono- or di-carboxylic acid; 0.2 to 3% of a stabilizer and 0 to 1% of a polyunsaturated copolymerizable monomer, which emulsion has been prepared in water using hydroxyethylcellulose or polyvinyl alcohol as the protective colloid.
Claim 3
Dependent Claim
12 words
The laminate of claim 1 wherein the dialkyl maleate is dibutyl maleate.
Claim 4
Dependent Claim
45 words
The laminate of claim 1 wherein the vinyl ester in the emulsion copolymer is selected from the group consisting of vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl valerate, vinyl 2-ethyl-hexanoate, vinyl isoctanoate, vinyl nonoate, vinyl decanoate, vinyl pivalate and vinyl versatate.
Claim 5
Dependent Claim
12 words
The laminate of claim 3 wherein the vinyl ester is vinyl acetate.
Claim 6
Dependent Claim
20 words
The laminate of claim 1 wherein the N-methylol containing comonomer in the emulsion copolymer is N-methylol acrylamide or N-methylol methacrylamide.
Claim 7
Dependent Claim
37 words
The laminate of claim 1 wherein the ethylenically unsaturated acid in the emulsion copolymer is selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid or fumaric acid and mixtures thereof.
Claim 8
Dependent Claim
17 words
The laminate of claim 1 wherein the emulsion copolymer has a Tg of -10° to -20° C.
Claim 9
Dependent Claim
13 words
The laminate of claim 1 wherein hydroxyethycellulose is used as the protective colloid.
Claim 10
Dependent Claim
23 words
The laminate of claim 1 wherein the protective colloid is present in the emulsion in am amount of 2 to 3% by weight.
Claim 11
Dependent Claim
19 words
The laminate of claim 1 wherein an anionic or non-ionic surfactant is used in addition to the protective colloid.
Claim 12
Dependent Claim
110 words
The laminate of claim 10 wherein the surfactant is selected from the group consisting of alkyl sulfonates, alkylaryl sulfonates, alkyl sulfates of hydroxyalkanols, alkyl and alkylaryl disulfonates, sulfonated fatty acids, sulfates and phosphates of polyethoxylated alkanols and alkylphenols, esters of sulfosuccinic acid, the addition products of 5 to 50 moles of ethylene oxide adducted to straight-chained and branch-chained alkanols with 6 to 22 carbon atoms, or alkylphenols, or higher fatty acids, or higher fatty amides, or primary and secondary higher alkyl amines; as well as block copolymers of propylene oxide with ethylene oxide and mixtures thereof, and is present in amounts of 1 to 2% by weight of the polymerisate.
Claim 13
Dependent Claim
15 words
The laminate of claim 1 wherein the emulsion copolymer is prepared using batch polymerization techniques.
Claim 14
Dependent Claim
18 words
The laminate of claim 1 wherein a polymerization regulator is employed during the polymerization of the emulsion copolymer.
Claim 15
Dependent Claim
24 words
The laminate of claim 1 comprising a bleached kraft paper outer layer bonded to a treated or untreated polyester or polyethylene film inner layer.
Claim 16
Dependent Claim
15 words
The laminate of claim 1 used in the construction of a microwaveable bag for popcorn.
References Cited (Backward Citations)
US2480551A
Cited
US2965617A
Cited
US3201374A
Cited
US3467565A
Cited
US3268357A
Cited
US3483171A
Cited
US3345318A
Cited
GB1123879A
Cited
US3491070A
Cited
US3657174A
Cited
US3708388A
Cited
GB1188635A
Cited
US3485896A
Cited
US3501440A
Cited
US3723397A
Cited
US3639326A
Cited
US3690937A
Cited
US3923752A
Cited
US3755237A
Cited
US3817896A
Cited
US3969560A
Cited
GB1430186A
Cited
US3971766A
Cited
US3823108A
Cited
US3973045A
Cited
US4001160A
Cited
US4035329A
Cited
US3998997A
Cited
US4048411A
Cited
US4073779A
Cited
US4188441A
Cited
US4292332A
Cited
JPS5373235A
Cited
US4151146A
Cited
US4245076A
Cited
US4299941A
Cited
US4322516A
Cited
US4273145A
Cited
US4510274A
Cited
US4477532A
Cited
US4461031A
Cited
US4448309A
Cited
US4547428A
Cited
US4596713A
Cited
US4564664A
Cited
US4561108A
Cited
US4507429A
Cited
US4634629A
Cited
US4640838A
Cited
EP0185356A2
Cited
US4610920A
Cited
US4692366A
Cited
US4702957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |