US5097005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel copolyesters and their use in compostable products such as disposable diapers
Assignee: EIDP Inc
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Filing: 1991-01-25
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Granted: 1992-03-17
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Expires: 2011-01-25
Abstract
Abstract The invention provides novel copolyesters, fibers and films, nonwovens from the fibers and disposable products of the copolyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The copolyesters are based upon polyethylene terephthalate copolymerized with a 5-sulfoisophthalic acid and, if desired, a polyethylene ether, such as diethylene glycol, and include units from hydroxyacids selected for their melting points being lower than their decomposition temperatures.
Inventors
- 👤 Raymond F. Tietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:13
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/86; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15252; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L15/42; A61L15/62; C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/66; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08J; C08J5/00; C08J5/18; D01F6/84; A61F13/51; A61F2013/51002; A61F2013/51023; A61F2013/51035; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/51433; A61F13/53; A61F2013/530131; A61F2013/530343; A61F2013/53035; A61F13/534; A61F2013/53481; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A fiber and film forming copolyester consisting essentially of recurring structural units (1) of the formula --C(O)--R--C(O)--OGO-- in amount about 60-98% by weight, wherein R is about 97 to 99.9 mole % para-phenylene and about 0.1 to 2.5 mole % of the sulfonate radical ##STR4## where M is an alkali metal or alkaline earth metal, and wherein G is about 60 to 80 mole % --CH 2 --CH 2 -- and about 20 to 40 mole % --(CH 2 ) 2 --O--(CH 2 ) 2 --, and about 2 to 40% by weight of the copolyester being structural units (2) of the formula [--C(O)--Q--O--] n , wherein n and Q is such that the hydroxyacid HO--C(O)--Q--OH and/or the polyhydroxyacid HO[--C(O)--Q--O--] n H has a melting point at least 5° C. lower than its decomposition temperature.
Claim 2
Dependent Claim
135 words
A fiber and film forming copolyester consisting essentially of recurring structural units (1) of the formula --C(O)--R--C(O)--OGO-- in amount about 60-98% by weight, wherein R is about 97 to 99.9 mole % para-phenylene and about 0.1 to 2.5 mole % of the sulfonate radical ##STR4## where M is an alkali metal or alkaline earth metal, and wherein G is about 60 to 80 mole % --CH 2 --CH 2 -- and about 20 to 40 mole % --(CH 2 ) 2 --O--(CH 2 ) 2 --, and about 2 to 40% by weight of the copolyester being structural units (2) of the formula [--C(O)--Q--O--] n , wherein n and Q is such that the hydroxyacid HO--C(O)--Q--OH and/or the polyhydroxyacid HO[--C(O)--Q--O--] n H has a melting point at least 5° C. lower than its decomposition temperature.
Claim 3
Dependent Claim
53 words
A copolyester according to claim 1, wherein Q is selected from the group consisting of --CH 2 --, --CH 2 --CH 2 --, --CH 2 --CH 2 --CH 2 --, --C(R')H--, --(CH 2 ) 5 --, or --C(R')H--CH 2 -- where R' is selected from --CH 3 or --CH 2 --CH 3 .
Claim 4
Dependent Claim
48 words
Copolyester according to claim 1 or 2, wherein R is about 98 mole % para-phenylene and about 2% of the sulfonate radical, and G is about 80 mole % --CH 2 --CH 2 -- and about 20 mole % --(CH 2 ) 2 --O--(CH 2 ) 2 --.
Claim 5
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 6
Dependent Claim
8 words
A fiber of the copolyester of claim 2.
Claim 7
Dependent Claim
8 words
A fiber of the copolyester of claim 3.
Claim 8
Dependent Claim
9 words
A non-woven sheet of the copolyester of claim 1.
Claim 9
Dependent Claim
9 words
A non-woven sheet of the copolyester of claim 2.
Claim 10
Dependent Claim
9 words
A non-woven sheet of the copolyester of claim 3.
Claim 11
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 12
Dependent Claim
18 words
A composite of the film of the copolyester of claim 1 and of a layer of nonwoven sheet.
Claim 13
Dependent Claim
27 words
A disposable diaper which includes an absorbent body portion having on one surface thereof a water permeable nonwoven sheet of fibers of the polymer of claim 1.
Claim 14
Dependent Claim
24 words
A disposable diaper which includes an absorbent body portion having on one surface thereof a water impermeable film of the polymer of claim 1.
References Cited (Backward Citations)
US3018272A
Cited
US3853820A
Cited
US4418116A
Cited
US4526738A
Cited
US4483976A
Cited
US4704329A
Cited
US4883706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |