US3900653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite polyester films and process for producing the same
Assignee: Cellophane SA France
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Filing: 1973-02-13
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Granted: 1975-08-19
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Expires: 1993-02-13
Abstract
Abstract A monoaxially or biaxially drawn composite polyester film comprising at least two layers of polyesters having different physical properties, at least one of these layers being produced utilizing a catalytic system wherein the catalyst residue is insoluble in the polymer and at least one other polyester being produced using a catalyst system wherein the catalytic residue is soluble or only slightly insoluble in the polyester. The process for producing such composite polyester films comprises coextruding at least two polyester polymers into a layered film, one of these polyester layers containing crystallization sites in the form of the residue of the interchange catalyst used to form the polyester, and at least one polyester layer comprises one wherein the interchange catalyst system is soluble or only slightly insoluble in the polyester film; and drawing the layered films either monoaxially or biaxially.
Inventors
- 👤 Robert Riboulet
- 👤 Eugene Charvet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/36; B32B7/00; B32B7/02; B29C48/03; B29C48/07; B29C48/08; B32B2250/00; B32B2250/03; B32B2250/24; B32B2250/244; B32B2250/40; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2307/70; B32B2307/746; B32B2367/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/918; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
A COMPOSITE MONOAXIALLY OR BIAXIALLY ORIENTED POLYMESTER LAMINATE CONSISTING ESSENTIALLY OF (A) AT LEAST ONE POLYESTER FILM LAYER FORMED FROM THE POLYCONDENSATION OF A DICARBOXYLIC ACID AND A GLYCOL HAVING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF AN ESTER INTERCHANGE AND POLYCONDENSATION CATALYST SYSTEM, THE RESIDUE OF WHICH IS AT LEAST SUBSTANTIALLY INSOLUBLE IN THE POLYESTER MELT, AND (B) AT LEAST ONE POLYESTER FILM LAYER FORMED BY THE POLYCONDENSATION OF A DICARBOXYLIC ACID AND A GLYCOL HAVING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF AN ESTER INTERCHANGGE AND POLYCONDENSATION CATALYST SYSTEM, THE RESIDUE OF WHICH IS AT LEAST SUBSTANTIALLY SOLUBLE IN THE POLYESTER MELT WHEREIN SAID LAYER (A) CONTAINING THE INSOLUBLE CATALYST RESIDUE COMPRISES FROM 5 TO 25% BY WEIGHT OF THE COMPOSITE POLYESTER LAMINATE AND WHEREIN SAID LAYER (B) CONTAINING THE SOLUBLE CATALYST COMPRISES FROM 95 TO 75% BY WEIGHT OF THE COMPOSITE POLYESTER LAMINATE.
Claim 2
Dependent Claim
152 words
A COMPOSITE MONOAXIALLY OR BIAXIALLY ORIENTED POLYMESTER LAMINATE CONSISTING ESSENTIALLY OF (A) AT LEAST ONE POLYESTER FILM LAYER FORMED FROM THE POLYCONDENSATION OF A DICARBOXYLIC ACID AND A GLYCOL HAVING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF AN ESTER INTERCHANGE AND POLYCONDENSATION CATALYST SYSTEM, THE RESIDUE OF WHICH IS AT LEAST SUBSTANTIALLY INSOLUBLE IN THE POLYESTER MELT, AND (B) AT LEAST ONE POLYESTER FILM LAYER FORMED BY THE POLYCONDENSATION OF A DICARBOXYLIC ACID AND A GLYCOL HAVING FROM 2 TO 6 CARBON ATOMS IN THE PRESENCE OF AN ESTER INTERCHANGGE AND POLYCONDENSATION CATALYST SYSTEM, THE RESIDUE OF WHICH IS AT LEAST SUBSTANTIALLY SOLUBLE IN THE POLYESTER MELT WHEREIN SAID LAYER (A) CONTAINING THE INSOLUBLE CATALYST RESIDUE COMPRISES FROM 5 TO 25% BY WEIGHT OF THE COMPOSITE POLYESTER LAMINATE AND WHEREIN SAID LAYER (B) CONTAINING THE SOLUBLE CATALYST COMPRISES FROM 95 TO 75% BY WEIGHT OF THE COMPOSITE POLYESTER LAMINATE.
Claim 3
Dependent Claim
21 words
The laminate of claim 1, wherein at least one layer is formed by the polycondensation of ethylene glycol and terephthalic acid.
Claim 4
Dependent Claim
31 words
The laminate of claim 1, wherein the insoluble catalyst system is selected from conventional ester interchange catalyst systems consisting essentially of an antimony compound and a salt of calcium or lithium.
Claim 5
Dependent Claim
31 words
The laminate of claim 2, wherein the insoluble catalyst system is selected from conventional ester interchange catalyst systems consisting essentially of an antimony compound and a salt of calcium or lithium.
Claim 6
Dependent Claim
31 words
The laminate of claim 1, wherein the soluble catalYst system is selected from conventional ester interchange catalyst systems consisting essentially of an antimony compound and a salt of zinc or manganese.
Claim 7
Dependent Claim
31 words
The laminate of claim 2, wherein the soluble catalyst system is selected from conventional ester interchange catalyst systems consisting essentially of an antimony compound and a salt of manganese or zinc.
Claim 8
Dependent Claim
93 words
The laminate of claim 1, which comprises two layers of said polyester containing the insoluble catalyst residue and one layer containing a polyester having a soluble catalyst residue wherein the two layers containing the insoluble catalyst residue are on either side of the polyester layer containing the soluble catalyst residue wherein said layers of polyester containing the insoluble catalyst residue comprises from 5 to 25% by weight of the composite polyester laminate and the polyester layer containing the soluble catalyst residue comprises from 95 to 75% by weight of the composite polyester laminate.
Claim 9
Dependent Claim
40 words
The laminate of claim 1, wherein the insoluble catalyst system contains an ester-interchange catalyst selected from calcium acetate, calcium benzoate, lithium antimonate, or lithium acetate and a second catalyst selected from potassium antimonate, antimony trioxide, antimony pentoxide or antimony trichloride.
Claim 10
Dependent Claim
39 words
The laminate of claim 1, wherein the soluble catalyst system contains an ester-interchange catalyst selected from the acetates, borates, benzoates, or carbonates of manganese and zinc and a second catalyst selected from antimony trioxide, antimony pentoxide or antimony trichloride.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |