US4020228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gel composition, heat sealable substrates, and process for heat sealing
Assignee: WR Grace and Co
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Filing: 1974-11-11
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Granted: 1977-04-26
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Expires: 1994-11-11
Abstract
Abstract The invention disclosed is directed to a gel composition, including (a) an aliphatic saturated monocarboxylic acid having from about 10 to about 24 carbon atoms; (b) an interpolymer of ethylene and a vinyl ester of a monocarboxylic acid having from 1 to about 4 carbon atoms; (c) a tackifying resin; and (d) an organic solvent. Substrate surfaces to which the gel composition is applied typically exhibit good resistance to blocking and may be effectively heat sealed to other surfaces at relatively low temperatures in minimum time. In aspects of the invention the coated substrates may be polyolefinic or cellulosic sheet materials, including laminates thereof with vinylidene chloride interpolymer layers. Improved heat sealable substrates and processes for heat sealing are also described.
Inventors
- 👤 Frank E. Eastes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:46
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/28; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
185 words
A heat sealable article comprising a solid substrate selected from the group consisting of polyolefinic and cellulosic sheets having coated on at least one surface of the substrate a substantially dry residue of a substantially wax free gel composition adapted to contact another surface in heat sealing engagement, and wherein said gel consists essentially of: a. an aliphatic saturated monocarboxylic acid having from about 10 to about 24 carbon atoms; b. an interpolymer of ethylene and a vinyl ester of a monocarboxylic acid having from 1 to about 4 carbon atoms; c. a tackifying resin; and d. an organic solvent wherein, per 100 parts by total weight of said components (a), (b) and (c), the saturated carboxylic acid component is present in an amount from about 5 to about 40 parts by weight, the interpolymer component is present in an amount from about 20 to about 60 parts by weight, and the tackifying resin is present in an amount from about 5 to about 40 parts by weight wherein said interpolymer includes from about 15 to about 50 percent by weight of said vinyl ester.
Claim 2
Dependent Claim
185 words
A heat sealable article comprising a solid substrate selected from the group consisting of polyolefinic and cellulosic sheets having coated on at least one surface of the substrate a substantially dry residue of a substantially wax free gel composition adapted to contact another surface in heat sealing engagement, and wherein said gel consists essentially of: a. an aliphatic saturated monocarboxylic acid having from about 10 to about 24 carbon atoms; b. an interpolymer of ethylene and a vinyl ester of a monocarboxylic acid having from 1 to about 4 carbon atoms; c. a tackifying resin; and d. an organic solvent wherein, per 100 parts by total weight of said components (a), (b) and (c), the saturated carboxylic acid component is present in an amount from about 5 to about 40 parts by weight, the interpolymer component is present in an amount from about 20 to about 60 parts by weight, and the tackifying resin is present in an amount from about 5 to about 40 parts by weight wherein said interpolymer includes from about 15 to about 50 percent by weight of said vinyl ester.
Claim 3
Dependent Claim
18 words
The heat sealable article of claim 1 wherein the carboxylic acid has from 16 to 20 carbon atoms.
Claim 4
Dependent Claim
13 words
The heat sealable article of claim 1 wherein the acid is stearic acid.
Claim 5
Dependent Claim
15 words
The heat sealable article of claim 1 wherein the interpolymerized vinyl ester is vinyl acetate.
Claim 6
Dependent Claim
33 words
The heat sealable article of claim 1 wherein the tackifying resin is selected from the group consisting of hydrocarbon resins, copolymer resins of vinyl toluene copolymerized with α-methyl styrene, synthetic rubber, and polyamides.
Claim 7
Dependent Claim
33 words
The heat sealable article of claim 1 wherein the tackifying resin is selected from the group consisting of coumarone-indene hydrocarbon resins, terpene hydrocarbon resins, and copolymer resins of vinyl toluene and α-methyl styrene.
Claim 8
Dependent Claim
49 words
The heat sealable article of claim 1 wherein said saturated carboxylic acid is stearic acid; said interpolymerized vinyl ester is vinyl acetate; and tackifying resin is selected from the group consisting of coumarone-indene resin, terpene resins, copolymer resins of vinyl toluene and α-methyl styrene, and mixtures of said resins.
Claim 9
Dependent Claim
23 words
The coated substrate of claim 1 wherein the substrate is a polyolefinic sheet material, said residue being disposed on an outer surface thereof.
Claim 10
Dependent Claim
14 words
The coated substrate of claim 8 wherein said first outer layer is of polyethylene.
Claim 11
Dependent Claim
14 words
The coated substrate of claim 8 wherein said first outer layer is of polypropylene.
Claim 12
Dependent Claim
26 words
The coated substrate of claim 8 further including an outer layer of a vinylidene chloride interpolymer on a surface of said substrate opposite said outer surface
Claim 13
Dependent Claim
65 words
The coated substrate of claim 11 wherein the first outer layer is of polyethylene having a density from about 0.94 to about 0.96 gram per cubic centimeter and the vinylidene chloride interpolymer is a copolymer of (a) from about 80 to about 90 parts by weight of vinylidene chloride units and (b) from about 20 to about 10 parts by weight of vinyl chloride units.
Claim 14
Dependent Claim
31 words
The coated substrate of claim 1 wherein the substrate is a flexible sheet having an outer layer of a cellulosic sheet material, said residue being disposed on an outer surface thereof.
Claim 15
Dependent Claim
14 words
The coated substrate of claim 13 wherein said first outer layer is of glassine.
Claim 16
Dependent Claim
26 words
The coated substrate of claim 13 further including an outer layer of a vinylidene chloride interpolymer on a surface of said substrate opposite said outer surface.
Claim 17
Dependent Claim
50 words
The coated substrate of claim 15 wherein the first outer layer is of glassine and the vinylidene chloride interpolymer is a copolymer of (a) from about 80 to about 90 parts by weight of vinylidene chloride and (b) about 20 at to about 10 parts by weight of vinyl chloride.
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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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |