US4029876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-treated, corona-treated polymer bodies and a process for producing them
Assignee: Edgewell Personal Care Brands LLC
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Filing: 1975-04-30
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Granted: 1977-06-14
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Expires: 1995-04-30
Abstract
Abstract Polymer films, such as polypropylene and polyethylene, having improved surface adhesion characteristics and produced by subjecting conventional polymer films to a heat treatment followed by a corona treatment at an energy density-to-film surface of at least 9 watt-minutes/ft.2.
Inventors
- 👤 Theodore R. Beatty
- 👤 Harry Vourlis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:26
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B05; B05D; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/144; B29; B29C; B29C59/00; B29C59/10; C08J5/00; C08J5/12; C08J5/124; C08J5/128; C09; C09J; C09J5/00; C09J5/02; B29C65/00; C09J2423/00; C09J2423/04; C09J2423/048; C09J2423/10; C09J2423/108; C09J2427/00; C09J2427/008
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A process for producing a heat-treated, corona-treated polymer body having a surface with improved adhesion characterisitcs comprising the steps: a. heating a polymer body to above about 40° C. and below the melting temperature of said polymer body; and b. cooling the polymer body to ambient temperature and then subjecting said heat-treated and cooled body to a corona discharge at an energy density-to-film surface of at least 9 watt-minute per square foot to improve the affinity of a surface of said polymer body for adhesives.
Claim 2
Dependent Claim
85 words
A process for producing a heat-treated, corona-treated polymer body having a surface with improved adhesion characterisitcs comprising the steps: a. heating a polymer body to above about 40° C. and below the melting temperature of said polymer body; and b. cooling the polymer body to ambient temperature and then subjecting said heat-treated and cooled body to a corona discharge at an energy density-to-film surface of at least 9 watt-minute per square foot to improve the affinity of a surface of said polymer body for adhesives.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said polymer body is a film selected from the group consisting of polypropylene, polyethylene and flexible polyvinyl chloride.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said polymer body is polypropylene.
Claim 5
Dependent Claim
11 words
The process of claim 2 wherein said polymer body is polyethylene.
Claim 6
Dependent Claim
13 words
The process of claim 2 wherein said polymer body is flexible polyvinyl chloride.
Claim 7
Dependent Claim
26 words
The process of claim 2 wherein the corona discharge in step (b) is conducted with an energy density-to-film surface of at least 40 watt-minutes/ft. 2 .
Claim 8
Dependent Claim
48 words
The process of claim 1 wherein the polymer body is polypropylene film; wherein the polypropylene film is heated in step (a) up to about 120° C. and wherein the corona discharge in step (b) is conducted with an energy density-to-film surface of at least 40 watt-minutes/ft. 2 .
Claim 9
Dependent Claim
26 words
The process of claim 2 wherein the corona discharge in step (b) is conducted with an energy density-to-film surface of at least 118 watt-minutes/ft. 2 .
Claim 10
Dependent Claim
12 words
A polymer body made in accordance with the process of claim 1.
Claim 11
Dependent Claim
23 words
The polymer body of claim 9 wherein said polymer body is selected from the group consisting of polypropylene, polyethylene and flexible polyvinyl chloride.
Claim 12
Dependent Claim
14 words
The polymer body of claim 9 wherein said force is at least 9 lbs./in.
References Cited (Backward Citations)
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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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |