US4870110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reclaiming polyethylene terephthalate scrap contaminated with chlorine-containing polymer
Assignee: EIDP Inc
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Filing: 1989-01-26
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Granted: 1989-09-26
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Expires: 2009-01-26
Abstract
Abstract Polyethylene terephthalate scrap material containing on its surface a chlorine-containing polymer such as, for example, polyvinylidene chloride or polyvinyl chloride, can be recovered and reused by melt-blending it with a polymer from a defined class of ethylene copolymers containing an epoxy group, and melt processing the blend in the same manner as virgin polyethylene terephthalate. The recovered and reprocessed polymer material has good physical properties and barrier properties.
Inventors
- 👤 Vinodkumar Mehra
- 👤 Pallatheri M. Subramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:33
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08L; C08L67/00; C08L67/02; C08J2367/00; C08J2367/02; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
170 words
A process for recovering and reusing scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinylidene chloride and of vinyl chloride, said process comprising combining said scrap material with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer; X is the radical formed from ##STR2## where: R 1 is an alkyl group with 1-8 carbon atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent of the ethylene copolymer, and melt-blending the combined polymer materials at a melt temperature of about 260°-310° C.
Claim 2
Dependent Claim
170 words
A process for recovering and reusing scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinylidene chloride and of vinyl chloride, said process comprising combining said scrap material with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer; X is the radical formed from ##STR2## where: R 1 is an alkyl group with 1-8 carbon atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent of the ethylene copolymer, and melt-blending the combined polymer materials at a melt temperature of about 260°-310° C.
Claim 3
Dependent Claim
12 words
The process of claim 1 where R 1 contains 4-6 carbon atoms.
Claim 4
Dependent Claim
12 words
The process of claim 2, where R 1 contains 4 carbon atoms.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein Y is selected from the class consisting of glycidyl acrylate and glycidyl methacrylate.
Claim 6
Dependent Claim
19 words
The process of claim 4 where the ethylene copolymer is a copolymer of ethylene, n-butyl acrylate, and glycidyl methacrylate.
Claim 7
Dependent Claim
12 words
The process of claim 1 where R 2 is hydrogen or methyl.
Claim 8
Dependent Claim
10 words
The process of claim 6 where R 2 is hydrogen.
Claim 9
Dependent Claim
15 words
The process of claim 1 where X comprises 15-35 weight percent of the ethylene copolymer.
Claim 10
Dependent Claim
15 words
The process of claim 8 where X comprises 20-35 weight percent of the ethylene copolymer.
Claim 11
Dependent Claim
9 words
The process of claim 1 where X is absent.
Claim 12
Dependent Claim
15 words
The process of claim 1 where Y comprises 2-10 weight percent of the ethylene copolymer.
Claim 13
Dependent Claim
15 words
The process of claim 11 where Y comprises 3-8 weight percent of the ethylene copolymer.
Claim 14
Dependent Claim
45 words
A process of claim 1 where there also is initially present in the blend about 0.05-1.0%, based on the weight of the scrap material, of an additive selected from the group consisting of calcium carbonate, calcium stearate, other metal stearates, and natural and synthetic hydrotalcite.
Claim 15
Dependent Claim
28 words
A process of claim 1 where there also is initially present in the blend about 5-25%, based on the total polymer weight, of a low modulus toughening polymer.
Claim 16
Dependent Claim
160 words
A paint can melt-fabricated from a polymer blend composition consisting essentially of scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinylidene chloride and of vinyl chloride, said scrap material being melt-blended with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer, X is the radical formed from ##STR3## where: R 1 is an alkyl group with 1-8 carbon atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent of the ethylene copolymer.
Claim 17
Dependent Claim
160 words
A paint can melt-fabricated from a polymer blend composition consisting essentially of scrap material of polyethylene terephthalate coated with a chlorine-containing polymer selected from the group consisting of polymers of vinylidene chloride and of vinyl chloride, said scrap material being melt-blended with about 5-25% based on the weight of said scrap material of an ethylene copolymer E/X/Y, where E is the radical formed from ethylene and comprises about 40-99.5 weight percent of the ethylene copolymer, X is the radical formed from ##STR3## where: R 1 is an alkyl group with 1-8 carbon atoms; R 2 is hydrogen, methyl, or ethyl; and X comprises about 0-40 weight percent of the ethylene copolymer; and Y is an epoxy group-containing copolymerizable monomer selected from the class consisting of epoxy esters of copolymerizable unsaturated organic acids, epoxy ethers having a copolymerizable vinyl or allyl group, and monoepoxy-substituted diolefins of 4 to 12 carbon atoms, and comprises about 0.5-20 weight percent of the ethylene copolymer.
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JPS54144453A
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |