US4127633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fabricating biaxially oriented container of polyethylene terephthalate coated with a copolymer of vinylidene chloride
Assignee: Imperial Chemical Industries Ltd
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Filing: 1977-04-04
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Granted: 1978-11-28
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Expires: 1997-04-04
Abstract
Abstract Polyethylene terephthalate preforms, for fabrication into containers such as bottles by blow moulding, are heated to 40° to 80° C prior to coating with an aqueous vinylidene chloride copolymer latex.
Inventors
- 👤 Robert L. Addleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:21
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/22; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; B29B; B29B11/00; B29B11/06; B29B11/08; B29B11/10; B29B11/14; B29C49/42; B29C49/78; B29C49/786; B29C2049/7861; B29C2049/7862; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/081; B29C2949/0811; B29C2949/0819; B29C2949/082; B29C2949/0829; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3032; B29C2949/3041; B29C2949/3064; B29C2949/3074; B29C2949/3078; B29C2949/308; B29C49/071; B29K; B29K2067/00; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; C08J2367/00; C08J2367/02; C08J2427/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A process for the production of a coated, biaxially oriented container of polyethylene terephthalate comprising a. providing a container-preform of amorphous polyethylene terephthalate; b. heating said preform to a temperature of 40° to 80° C; c. while said preform is at a temperature of 40° to 80° C and while preventing undue bulk crystallization, applying to said preform a coating of an aqueous dispersion of a copolymer of vinylidene chloride and drying said coating on said preform; and d. stretching the dried coated preform axially and radially, in a blow molding process, at a temperature suitable for orientation, into a container.
Claim 2
Dependent Claim
101 words
A process for the production of a coated, biaxially oriented container of polyethylene terephthalate comprising a. providing a container-preform of amorphous polyethylene terephthalate; b. heating said preform to a temperature of 40° to 80° C; c. while said preform is at a temperature of 40° to 80° C and while preventing undue bulk crystallization, applying to said preform a coating of an aqueous dispersion of a copolymer of vinylidene chloride and drying said coating on said preform; and d. stretching the dried coated preform axially and radially, in a blow molding process, at a temperature suitable for orientation, into a container.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein said temperature ranges from 50° to 70° C.
Claim 4
Dependent Claim
28 words
A process according to claim 1 wherein, prior to applying said coating, the preform is treated with a solvent that induces crystallisation of the surface of the preform.
Claim 5
Dependent Claim
25 words
A process according to claim 3 wherein the preform is treated with ethyl methyl ketone at 40° to 60° C for 1 to 2 minutes.
Claim 6
Dependent Claim
30 words
A process according to claim 1 wherein the surface of the preform prior to coating has a spherulitic texture extending between 30 and 50 μm inward from the preform surface.
Claim 7
Dependent Claim
18 words
A process according to claim 1 wherein the coating is applied to the interior surface of the preform.
Claim 8
Dependent Claim
32 words
A process according to claim 1 wherein the vinylidene chloride copolymer is a copolymer of vinylidene chloride and at least one monomer selected from the group consisting of acrylonitrile and methyl acrylate.
Claim 9
Dependent Claim
22 words
A process according to claim 1 wherein the copolymer contains 5 to 10% by weight of acrylonitrile, methyl acrylate or mixtures thereof.
Claim 10
Dependent Claim
24 words
A process according to claim 8 wherein the copolymer also contains up to 10% by weight of units derived from an unsaturated carboxylic acid.
Claim 11
Dependent Claim
53 words
A process according to claim 1, wherein said copolymer contains at least one monomer selected from the group consisting of acrylonitrile, methyl acrylate, and an unsaturated carboxylic acid, said copolymer containing 5 to 10% by weight of acrylonitrile, methyl acrylate or mixtures thereof and 0 to 10% by weight of the unsaturated acid.
Claim 12
Dependent Claim
15 words
A process according to claim 10, wherein said temperature ranges between 50° to 70° C.
Claim 13
Dependent Claim
52 words
A process according to claim 1, wherein more than one coating of said aqueous dispersion is applied to said preform; wherein each coating is dried after each application thereof; and wherein said preform is heated to 40° to 80° C prior to application of each coating, in accordance with (b) and (c).
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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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |