US4051280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating to form a foam find protective package
Assignee: Westvaco Corp
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Filing: 1975-06-09
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Granted: 1977-09-27
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Expires: 1995-06-09
Abstract
Abstract A laminated protective packaging material particularly for use in making heat sealable envelopes comprises an outer paper substrate having a continuous, aqueous based heat sensitizable coating applied to one surface thereof. The outer paper substrate may consist of conventional coated or uncoated paper, bleached or unbleached kraft paper or any other similar material. The heat sensitizable coating may consist of an alkali-soluble ethylene-acrylic acid copolymer resin or other heat sensitizable ionic polymer resin with or without the addition of filler materials for increasing the viscosity of the coating and/or for improving the heat sealing characteristics of the coating. The heat sensitizable coating is particularly characterized by its ability to be heat sealed to itself and laminated to a foamed polymeric material having a cellular structure such as polyethylene foam.
Inventors
- 👤 Frank W. Mellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B29/00; B32B29/002; B32B29/007; B65; B65D; B65D65/00; B65D65/38; B65D65/42; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; B32B2255/00; B32B2255/12; B32B2255/26; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/30; B32B2307/31; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
224 words
A method of producing a packaging material particularly for use in making heat sealable protective envelopes, said packaging material consisting of an outer paper substrate, an aqueous based heat sensitizable coating applied to one surface of said substrate and a foamed polymeric material of cellular structure adhered to substantially the entire area of the coated surface of said substrate comprising: a. forming an aqueous coating of powdered polyethylene and a copolymer of ethylene and acrylic acid, said coating comprising from about 30 to 100 parts of a copolymer consisting of from about 70-85% ethylene and from about 30-15% acrylic acid and up to about 70 parts of a powdered polyethylene material having a particle size in the range of from about 10-30 microns, said coating having a solids content of from about 25 to 45%; b. applying a continuous film of said coating uniformly to one surface of a paper substrate to produce a coat weight of at least about 3 pounds per ream; c. drying said coating; d. adhering a polyethylene foam material to substantially the entire area of the coated surface of said substrate under the influence of heat and pressure while leaving portions of said coating surface exposed to be heat sealed to themselves; and, e. heat sealing said exposed surfaces to one another to form a foam lined protective envelope.
Claim 2
Independent Claim
224 words
A method of producing a packaging material particularly for use in making heat sealable protective envelopes, said packaging material consisting of an outer paper substrate, an aqueous based heat sensitizable coating applied to one surface of said substrate and a foamed polymeric material of cellular structure adhered to substantially the entire area of the coated surface of said substrate comprising: a. forming an aqueous coating of powdered polyethylene and a copolymer of ethylene and acrylic acid, said coating comprising from about 30 to 100 parts of a copolymer consisting of from about 70-85% ethylene and from about 30-15% acrylic acid and up to about 70 parts of a powdered polyethylene material having a particle size in the range of from about 10-30 microns, said coating having a solids content of from about 25 to 45%; b. applying a continuous film of said coating uniformly to one surface of a paper substrate to produce a coat weight of at least about 3 pounds per ream; c. drying said coating; d. adhering a polyethylene foam material to substantially the entire area of the coated surface of said substrate under the influence of heat and pressure while leaving portions of said coating surface exposed to be heat sealed to themselves; and, e. heat sealing said exposed surfaces to one another to form a foam lined protective envelope.
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |