US4358491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a hollow vessel having a frosted glass-like surface
Assignee: Toyobo Co Ltd
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Filing: 1978-08-29
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Granted: 1982-11-09
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Expires: 1998-08-29
Abstract
Abstract A process for producing a hollow vessel having a frosted glass-like surface which comprises molding a crystalline thermoplastic polyester copolymer comprising units of ethylene terephthalate as the main component into a transparent parison, crystallizing at least the surface layer portion of the parison and then subjecting it to blow molding.
Inventors
- 👤 Akiho Ota
- 👤 Masanori Nishikawa
- 👤 Masao Hattori
- 👤 Akio Tsuboi
- 👤 Yoshihisa Hama
- 👤 Tadashi Okudaira
- 👤 Shigeharu Sugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:47
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0005; B29C49/071; B29C49/42; B29C49/64; B29C49/6409; B29C49/6436; B29C49/6445; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C2949/082; B29C2949/0822; B29C2949/0826; B29C2949/0829; B29C2949/0831; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29C2949/3041; B29C49/42394; B29K; B29K2067/00; B29K2995/00; B29K2995/0037; B29K2995/004; Y; Y10; Y10S; Y10S264/00; Y10S264/907; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A process for producing a hollow vessel having a frosted glass-like surface which comprises molding a crystalline thermoplastic polyester copolymer comprising 80 to 95 mole % of ethylene terphthalate units and 20 to 5 mole % of units selected from the group consisting of isophthalic acid, neopentyl glycol and mixtures thereof, said polyester copolymer having an intrinsic viscosity of not less than 0.5, into a transparent parison, crystallizing at least the surface layer portion of the parison and then subjecting it to blow molding at a temperature at which biaxial stretching or expansion is realizable.
Claim 2
Dependent Claim
95 words
A process for producing a hollow vessel having a frosted glass-like surface which comprises molding a crystalline thermoplastic polyester copolymer comprising 80 to 95 mole % of ethylene terphthalate units and 20 to 5 mole % of units selected from the group consisting of isophthalic acid, neopentyl glycol and mixtures thereof, said polyester copolymer having an intrinsic viscosity of not less than 0.5, into a transparent parison, crystallizing at least the surface layer portion of the parison and then subjecting it to blow molding at a temperature at which biaxial stretching or expansion is realizable.
Claim 3
Dependent Claim
19 words
The process according to claim 1, wherein the polyester copolymer has an intrinsic viscosity of from 0.6 to 1.0.
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein the crystallization is effected by heating.
Claim 5
Dependent Claim
39 words
The process according to claim 1, wherein the crystallization is effected until the average density of the surface layer from the external surface to the depth of at least 1 mm is in a range of 1.345 to 1.375.
Claim 6
Dependent Claim
15 words
The process according to claim 1, wherein the surface of the parison is crystallized partially.
Claim 7
Dependent Claim
16 words
A hollow vessel having a frosted glass-like surface, produced by the process according to claim 1.
References Cited (Backward Citations)
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US3733309A
Cited
US3733309B1
Cited
US3803275A
Cited
US3900120A
Cited
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Cited
US4164298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |