US4868064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite PVDC-coated polyester films
Assignee: Rhone Poulenc Films SA
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Filing: 1988-01-21
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Granted: 1989-09-19
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Expires: 2008-01-21
Abstract
Abstract Composite, typically coextruded polyvinylidene chloride (PVDC)-coated polyester films, well adapted, e.g., as packaging materials, include a sulfonated copolyester interlayer which serves as a primer for improvedly adhering the PVDC topcoat to the polyester base.
Inventors
- 👤 Pierre Grosjean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:57
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/36; B32B7/00; B32B7/04; B32B7/12; C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08J; C08J5/00; C08J5/18; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/048; C08L; C08L67/00; C08L67/02; B32B2307/00; B32B2307/50; B32B2307/514; B32B2367/00; C08J2367/00; C08J2367/02; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; C08J2467/00; C08J2467/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
50 words
A composite polyester film comprising a crystalline or semicrystalline polyester film substrate (A), said film substrate (A) having a coating (B) of an oxysulfonylated copolyester adhesion primer on at least one of the face surfaces thereof, and a polyvinylidene chloride topcoat (C) on said at least one primer coating (B).
Claim 2
Dependent Claim
50 words
A composite polyester film comprising a crystalline or semicrystalline polyester film substrate (A), said film substrate (A) having a coating (B) of an oxysulfonylated copolyester adhesion primer on at least one of the face surfaces thereof, and a polyvinylidene chloride topcoat (C) on said at least one primer coating (B).
Claim 3
Dependent Claim
13 words
A packaging material comprising the composite polyester film as defined by claim 1.
Claim 4
Dependent Claim
36 words
The composite polyester film as defined by claim 1, wherein the sulfonated copolyester comprises a content of oxysulfonyl group-containing recurring units ranging from 2 to 20% of the total number of recurring units of like monomer.
Claim 5
Dependent Claim
59 words
The composite polyester film as defined by claim 1, wherein the sulfonated copolyester comprising said coating (B) has a plurality of recurring oxysulfonyl groups of the general formula: (--SO.sub.3).sub.n M (I) in which n is 1 or 2; and M is a hydrogen atom, an alkali metal, an alkaline earth metal, an ammonium cation or a quaternary ammonium cation.
Claim 6
Dependent Claim
35 words
The composite polyester film as defined by claim 1, wherein the polyester comprising said substrate (A) is a homopolyester or a copolyester of terephthalic acid containing at least 80 mol % of terephthalate recurring units.
Claim 7
Dependent Claim
20 words
The composite polyester film as defined by claim 5, wherein the polyester comprising said substrate (A) is ethylene glycol polyterephthalate.
Claim 8
Dependent Claim
81 words
The composite polyester film as defined by claim 1, wherein the sulfonated copolyester comprising said coating (B) has a plurality of aromatic diacid recurring units of the formula: ##STR2## in which D is 1 or 2; M is a hydrogen atom, an alkali metal, an alkaline earth metal, an ammonium cation or a quaternary ammonium cation; Z is a polyvalent aromatic radical; X and Y are hydroxycarbonyl radicals or derivatives thereof; and p is an integer equal to 1 or 2.
Claim 9
Dependent Claim
24 words
The composite polyester film as defined by claim 7, wherein the sulfonated copolyester comprises a plurality of recurring units derived from a hydroxysulfonylisophthalic acid.
Claim 10
Dependent Claim
34 words
The composite polyester film as defined by claim 7, wherein the sulfonated copolyester comprises a plurality of recurring units derived from ethylene glycol and/or the oligomers thereof having a molecular weight less than 600.
Claim 11
Dependent Claim
31 words
The composite polyester film as defined by claim 9, wherein the content by weight of recurring units derived from ethylene glycol oligomers in the sulfonated copolyester ranges from 2 to 30%.
Claim 12
Dependent Claim
23 words
The composite polyester film as defined by claim 1, wherein the sulfonated copolyester comprises a plurality of recurring units derived from terephthalic acid.
Claim 13
Dependent Claim
34 words
The composite polyester film as defined by claim 11, wherein the sulfonated copolyester comprises both a plurality of recurring units derived from terephthalic acid and a plurality of recurring units derived from isophthalic acid.
Claim 14
Dependent Claim
35 words
The composite polyester film as defined by claim 12, wherein the sulfonated copolyester the number of recurring units derived from isophthalic acid constituents up to 70% of the total number of the terephthalate/isophthalate recurring units.
Claim 15
Dependent Claim
23 words
The composite polyester film as defined by claim 1, wherein said sulfonated copolyester comprises admixture with at least one non-sulfonated polyester or copolyester.
Claim 16
Dependent Claim
36 words
The composite polyester film as defined by claim 14, wherein the number of oxysulfonyl group-containing recurring units present in the mixture constitutes from 2 to 10% of the total number of recurring units of like nature.
Claim 17
Dependent Claim
30 words
The composite polyester film as defined by claim 14, comprising from 20 to 80% by weight of sulfonated copolyester and from 80 to 20% by weight of a non-sulfonated copolyester.
Claim 18
Dependent Claim
22 words
The composite polyester film as defined by claim 14, wherein said non-sulfonated polyester or copolyester comprises a crystallizable polyester or noncrystallizable polyester.
Claim 19
Dependent Claim
33 words
The composite polyester film as defined by claim 14, comprising a crystallizable polyester which is a homopolyester or copolyester derived from terephthalic acid and containing at least 80 mol % of terephthalate units.
Claim 20
Dependent Claim
21 words
The composite polyester film as defined by claim 17, comprising a non-crystallizable polyester which is a copolyester derived from terephthalic acid.
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |