US3804663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of internally coating rigid or semi-rigid plastic containers
Assignee: Dow Chemical Co
•
Filing: 1971-05-26
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Granted: 1974-04-16
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Expires: 1991-05-26
Abstract
Abstract A method for spin coating the interior of a generally rigid or semi-rigid plastic hollow article, such as a container or parison, with a synthetic organic resinous material to provide a protective coating therein. The method comprises placing a quantity of a dispersion of synthetic organic resinous material, preferably a latex or solution, in a hollow article, spinning the article at high speed thereby causing centrifugal force to distribute and hold a coating of the dispersion uniformly on the interior surfaces of the same and then heating the coating while continuing to spin the article. The result of the spin coating method is an article with a substantially uniform interior protective film providing improved article characteristics such as gas and liquid barrier properties, color and appearance, taste and flavor protection and the like.
Inventors
- 👤 D Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:01
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; B05D7/227; B29; B29C; B29C49/00; B29C49/22; B05D1/00; B05D1/002; B05D2201/00; B05D3/00; B05D3/02; B05D3/0254; B05D3/0263; B29C2949/00; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
18 words
The method of claim 1 wherein said article is formed of a polymer which is multiaxially molecular oriented.
Claim 2
Dependent Claim
49 words
The method of claim 1 wherein said article is a parison which is blow molded into an internally coated container contemporaneously with and immediately after said heating step c thereby utilizing said drying or fusion heat from step c to help soften said parison before blow molding the same.
Claim 3
Dependent Claim
19 words
The method of claim 3 wherein said blown container has a wall substrate polymer which is multi-axially molecular oriented.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said dry coating has gas and liquid barrier properties.
Claim 5
Dependent Claim
42 words
The method of claim 5 wherein said dispersion comprises a latex the major resin component of which is a copolymer having copolymerized therein at least about 70 weight percent vinylidene chloride and a remainder of one or more copolymerizable olefinically unsaturated monomers.
Claim 6
Dependent Claim
41 words
The method of claim 5 wherein said dispersion comprises a suspension the major resin component of which is a copolymer having copolymerized therein at least 70 weight percent vinylidene chloride and a remainder of one or more copolymerizable olefinically unsaturated monomers.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein said dispersion comprises an emulsion the major resin component of which is epoxy resin.
Claim 8
Dependent Claim
20 words
The method of claim 5 wherein said dispersion comprises a suspension the major resin component of which is epoxy resin.
Claim 9
Dependent Claim
20 words
The method of claim 5 wherein said dispersion comprises a latex the major resin component of which is acrylonitrile polymer.
Claim 10
Dependent Claim
20 words
The method of claim 5 wherein said dispersion comprises a suspension the major resin component of which is acrylonitrile polymer.
Claim 11
Dependent Claim
27 words
The method of claim 1 wherein said heating of said coating is accomplished by inserting an infrared heating element or other like heating element into said article.
Claim 12
Dependent Claim
20 words
The method of claim 1 wherein said heating of said coating is acComplished by blowing hot air into said article.
Claim 13
Dependent Claim
16 words
The method of claim 1 wherein said heating of said coating is accomplished by dielectric heating.
Claim 14
Dependent Claim
16 words
The method of claim 1 wherein said heating of said coating is accomplished by microwave heating.
Claim 15
Dependent Claim
22 words
The method of claim 1 wherein said dry coating has a range from about 0.1 mil to about 1.0 mils in thickness.
Claim 16
Dependent Claim
23 words
The method of claim 1 wherein said parison or container is spun at a high rate of speed of at least 100 r.p.m.
Claim 17
Dependent Claim
17 words
The method of claim 1 wherein said placing said dispersion into said article is accomplished by spraying.
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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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |