Patent US4874647A successfully refreshed from Google Patents.
US4874647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester composition, molded polyester laminate and use thereof
Assignee: Mitsui Chemicals Inc
•
Filing: 1988-11-28
•
Granted: 1989-10-17
•
Expires: 2008-11-28
Abstract
Abstract A transparent, heat resistant polyester composition having improved mechanical strength is provided, which comprises (A) 20 to 80% by weight of a polyalkylene terephthalate predominantly comprising ethylene terephthalate and having an intrinsic viscosity of from 0.6 to 1.2 dl/g, and (B) 20 to 80% by weight of a bisphenol-A polycarbonate having an intrinsic viscosity of from 0.6 to 1.2 dl/g, the composition having an intrinsic viscosity of from 0.6 to 1.2 dl/g and a single glass transition temperature of from 80 DEG to 130 DEG C. A polyester laminate may be molded as comprising a layer of the polyester composition and a layer of alkylene terephthalate. The molded polyester laminate can take any form including films and containers.
Inventors
- 👤 Tadao Yatsu
- 👤 Yoshinori Akana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B1/00; B32B1/08; B32B27/36; C; C08; C08L; C08L67/00; C08L67/02; C08L69/00; B32B2307/00; B32B2307/40; B32B2307/412; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/31504; Y10T428/31507; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A molded polyester laminate comprising (I) a layer of a polyester composition comprising (A) 20 to 80% by weight of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., and (B) 20 to 80% by weight of a polycarbonate comprising bisphenol-A as a diol component and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., said composition having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C. and a single glass transition temperature [Tg] in the range of from 80° to 130° C., and (II) a layer of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit.
Claim 2
Dependent Claim
144 words
A molded polyester laminate comprising (I) a layer of a polyester composition comprising (A) 20 to 80% by weight of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., and (B) 20 to 80% by weight of a polycarbonate comprising bisphenol-A as a diol component and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., said composition having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C. and a single glass transition temperature [Tg] in the range of from 80° to 130° C., and (II) a layer of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit.
Claim 3
Dependent Claim
145 words
A stretched molded polyester laminate comprising (I) a layer of a polyester composition comprising (A) 20 to 80% by weight of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., and (B) 20 to 80% by weight of a polycarbonate comprising bisphenol-A as a diol component and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., said composition having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C. and a single glass transition temperature [Tg] in the range of from 80° to 130° C., and (II) a layer of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit.
Claim 4
Dependent Claim
145 words
A stretched molded polyester laminate comprising (I) a layer of a polyester composition comprising (A) 20 to 80% by weight of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., and (B) 20 to 80% by weight of a polycarbonate comprising bisphenol-A as a diol component and having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C., said composition having an intrinsic viscosity [η] in the range of from 0.6 to 1.2 dl/g as measured in o-chlorophenol at 25° C. and a single glass transition temperature [Tg] in the range of from 80° to 130° C., and (II) a layer of a polyalkylene terephthalate comprising ethylene terephthalate as a main unit.
Claim 5
Dependent Claim
12 words
A multilayer hollow preform, comprising the molded polyester laminate of claim 1.
Claim 6
Dependent Claim
12 words
A multilayer hollow article comprising the molded polyester laminate of claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |