Patent US4410600A successfully refreshed from Google Patents.
US4410600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated polyester film and polyester/polyolefin laminates produced therefrom
Assignee: Imperial Chemical Industries Ltd
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Filing: 1982-08-02
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Granted: 1983-10-18
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Expires: 2002-08-02
Abstract
Abstract A coated polyester film suitable for producing polyester/polyolefin laminates consists of biaxially oriented poly(ethylene terephthalate) film coated with a cross-linked styrene copolymer by deposition from an aqueous coating composition which comprises (A) a copolymer containing 50-75 mol % of styrene units and 25-50 mole % of comonomer units providing carboxylic groups (10-50 mole %) and alkyl carboxylate groups (20-50 mole %) and (B) a melamine/formaldehyde cross-linking agent. The styrene copolymer (A) is preferably a water-soluble copolymer of styrene and maleic anhydride partially converted into butyl ester and partially neutralized with ammonia, and the cross-linking agent (B) is conveniently hexamethoxymethylmelamine. The polyolefin layer in the laminates produced may in particular be of low-density polyethylene.
Inventors
- 👤 Patrick T. McGrail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:37
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/03; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/36; B32B7/04; B32B7/12; B32B2307/00; B32B2307/50; B32B2307/514; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
Coated polyester film which consists of biaxially oriented poly(ethylene terephthalate) film coated with a cross-linked styrene polymer which is deposited from an aqueous coating composition comprising: (A) 100 parts by weight of a copolymer of: (i) 50-75 mole % of styrene units which may be alpha- and/or ring-substituted with methyl or halogen; (ii) 25-50 mole % of comonomer units selected from units of acrylic, methacrylic, itaconic and maleic acids, alkyl half-esters of itaconic and maleic acids, alkyl acrylates and methacrylates and dialkyl maleates; the comonomer units being such as to provide the copolymer with 10-50 mole % of carboxylic groups which may be present as salts and 20-50 mole % of alkyl carboxylate groups in which the alkyl groups may each have up to 10 carbon atoms; (B) 10-20 parts by weight of cross-linking agent selected from condensation products of formaldehyde and melamine and said condensation products having hydroxyl groups converted into methoxy, ethoxy, propoxy or butoxy groups.
Claim 2
Dependent Claim
158 words
Coated polyester film which consists of biaxially oriented poly(ethylene terephthalate) film coated with a cross-linked styrene polymer which is deposited from an aqueous coating composition comprising: (A) 100 parts by weight of a copolymer of: (i) 50-75 mole % of styrene units which may be alpha- and/or ring-substituted with methyl or halogen; (ii) 25-50 mole % of comonomer units selected from units of acrylic, methacrylic, itaconic and maleic acids, alkyl half-esters of itaconic and maleic acids, alkyl acrylates and methacrylates and dialkyl maleates; the comonomer units being such as to provide the copolymer with 10-50 mole % of carboxylic groups which may be present as salts and 20-50 mole % of alkyl carboxylate groups in which the alkyl groups may each have up to 10 carbon atoms; (B) 10-20 parts by weight of cross-linking agent selected from condensation products of formaldehyde and melamine and said condensation products having hydroxyl groups converted into methoxy, ethoxy, propoxy or butoxy groups.
Claim 3
Dependent Claim
43 words
Coated polyester film according to claim 1 in which (A) is a water-soluble copolymer of 50-75 mole % of styrene units and 25-50 mole % of units of maleic anhydride which have been partially converted into butyl ester and partially neutralized with ammonia.
Claim 4
Dependent Claim
23 words
Coated polyester film according to claim 1 in which (B) is hexamethoxymethylmelamine or melamine-formaldehyde condensate having a methoxymethyl-methylol ratio of at least 1:2.
Claim 5
Dependent Claim
31 words
Polyester/polyolefin laminate which consists of coated polyester film as claimed in claim 1 overcoated with a layer of polyethylene or of ethylene copolymer containing up to 10 mole % of comonomer.
Claim 6
Dependent Claim
13 words
Polyester/polyolefin laminate according to claim 4 in which the polyolefin is low-density polyethylene.
References Cited (Backward Citations)
US4328283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |