Patent US4551368A successfully refreshed from Google Patents.
US4551368A
Expired / Lapsed
US
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Polyester melt blends having high gas barrier properties
Assignee: Corpus Christi Polymers LLC
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Filing: 1982-09-07
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Granted: 1985-11-05
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Expires: 2002-09-07
Abstract
Abstract Melt blends of polyethylene isophthalate with polyethylene terephthalate or polybutylene terephthalate or copolymers thereof have good barrier resistant properties to oxygen. Such blends are useful as packaging materials, for example films, containers, bottles, and the like.
Inventors
- 👤 Richard R. Smith
- 👤 John R. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:38
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
86 words
A melt blend of polyesters having good oxygen barrier resistance, consisting essentially of: the melt product of two polyesters, one of said polyesters being polyethylene isophthalate homopolymer in an amount of from about 5 to about 95 mole percent and the remaining 95 to 5 mole percent being polyethylene terephthalate homopolymer, said mole percent based upon the total moles of said polyesters, the melt blend having an oxygen permeability of 8 cc·mil/100 in 2 ·day·atm or less and an intrinsic viscosity of 0.4 dl/g or greater.
Claim 2
Dependent Claim
86 words
A melt blend of polyesters having good oxygen barrier resistance, consisting essentially of: the melt product of two polyesters, one of said polyesters being polyethylene isophthalate homopolymer in an amount of from about 5 to about 95 mole percent and the remaining 95 to 5 mole percent being polyethylene terephthalate homopolymer, said mole percent based upon the total moles of said polyesters, the melt blend having an oxygen permeability of 8 cc·mil/100 in 2 ·day·atm or less and an intrinsic viscosity of 0.4 dl/g or greater.
Claim 3
Dependent Claim
25 words
A melt blend of polyesters according to claim 1, wherein the amount of said polyethylene isophthalate ranges from about 10 to about 90 mole percent.
Claim 4
Dependent Claim
26 words
A melt blend of polyesters according to claim 2, wherein said oxygen permeability is 7.0 or less and wherein said intrinsic viscosity is 0.5 or greater.
Claim 5
Dependent Claim
26 words
A melt blend of polyesters according to claim 3, wherein said oxygen permeability is 6.0 or less, and wherein said intrinsic viscosity is 0.7 or greater.
Claim 6
Dependent Claim
24 words
A melt blend of polyesters according to claim 4, wherein said blend contains from about 10 to about 35 mole percent of polyethylene isophthalate.
Claim 7
Dependent Claim
24 words
A melt blend of polyesters according to claim 4, wherein said blend contains from about 90 to about 65 mole percent of polyethylene isophthalate.
Claim 8
Dependent Claim
25 words
A melt blend of polyesters according to claim 1, 2, 4, 5, or 6, wherein said polyester blend is in the form of a container.
Claim 9
Dependent Claim
19 words
A melt blend of polyesters according to claim 8, wherein said container is in the form of a bottle.
Claim 10
Dependent Claim
26 words
A melt blend of polyesters according to claim 1, 2, 4, 5, or 6, wherein said melt product is formed by extruded blending or reactor blending.
Claim 11
Dependent Claim
98 words
A melt blend of polyesters, consisting essentially of: two polyesters melt blended to form a high oxygen barrier melt blend polyester product, one of said polyesters being polyethylene isophthalate homopolymer, the amount of said polyethylene isophthalate homopolymer ranging from about 5 to 95 mole percent and the remaining 95 to 5 mole percent being polyethylene terephthalate homopolymer, said mole percent based upon the total moles of said polyesters blended, the intrinsic viscosity of said melt blend product being 0.4 dl/g or greater and said melt blend having an oxygen permeability of 8.0 cc·mil/100 in 2 ·day·atm or less.
Claim 12
Dependent Claim
98 words
A melt blend of polyesters, consisting essentially of: two polyesters melt blended to form a high oxygen barrier melt blend polyester product, one of said polyesters being polyethylene isophthalate homopolymer, the amount of said polyethylene isophthalate homopolymer ranging from about 5 to 95 mole percent and the remaining 95 to 5 mole percent being polyethylene terephthalate homopolymer, said mole percent based upon the total moles of said polyesters blended, the intrinsic viscosity of said melt blend product being 0.4 dl/g or greater and said melt blend having an oxygen permeability of 8.0 cc·mil/100 in 2 ·day·atm or less.
Claim 13
Dependent Claim
34 words
A melt blend of polyesters according to claim 10, wherein said melt blend polyester product is formed by heating said polyesters at a temperature above the melting point of the highest melting point polyester.
Claim 14
Dependent Claim
43 words
A melt blend of polyesters according to claim 11, wherein the amount of said polyethylene isophthalate ranges from about 10 to about 90 mole percent, wherein said oxygen permeability is 7.0 or less, and wherein said intrinsic viscosity is 0.5 dl/g or greater.
Claim 15
Dependent Claim
27 words
A melt blend of polyesters according to claim 12, wherein said oxygen permeability is 6.0 or less, and wherein said intrinsic viscosity is 0.7 dl/g or greater.
Claim 16
Dependent Claim
25 words
A melt blend of polyesters according to claim 13, wherein the amount of said polyethylene isophthalate ranges from about 10 to about 35 mole percent.
Claim 17
Dependent Claim
22 words
A melt blend of polyesters according to claim 13, wherein said polyethylene isophthalate ranges from about 90 to about 65 mole percent.
Claim 18
Dependent Claim
29 words
A melt blend of polyesters according to claim 10, 11, 13, 14, or 15, wherein said polyester blend product is formed by reactor blending or extruder blending said polyesters.
Claim 19
Dependent Claim
25 words
A melt blend of polyesters according to claim 10, 11, 13, 14, or 15, wherein said melt blend is in the form of a bottle.
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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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |