US5097004A
Expired / Lapsed
US
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Novel polyesters 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 a novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters 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 polyesters are based upon polyethylene terephthalate copolymerized with a polyethylene glycol and a 5-sulfoisophthalic acid and, if desired, a polyethylene ether such as diethylene glycol.
Inventors
- 👤 Francis G. Gallagher
- 👤 Cathy J. Hamilton
- 👤 Raymond F. Tietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:48
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15252; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; D01F6/86; 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
139 words
A fiber and film forming polyester consisting essentially of recurring structural units of the formula --C(O)--R--C(O)--OGO-- 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 at least about 13% by weight of a radical of a polyalkylene glycol of molecular weight at least about 250, and up to about 40 mole % of a polyethylene ether radical selected from the group consisting of --(CH 2 ) 2 --O--(CH 2 ) 2 -- and --(CH 2 ) 2 --O--(CH 2 ) 2 --O--(CH 2 ) 2 --, with the remainder being selected from the group consisting of --(CH 2 ) 2 --, --(CH 2 ) 3 -- and --(CH 2 ) 4 --.
Claim 2
Dependent Claim
139 words
A fiber and film forming polyester consisting essentially of recurring structural units of the formula --C(O)--R--C(O)--OGO-- 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 at least about 13% by weight of a radical of a polyalkylene glycol of molecular weight at least about 250, and up to about 40 mole % of a polyethylene ether radical selected from the group consisting of --(CH 2 ) 2 --O--(CH 2 ) 2 -- and --(CH 2 ) 2 --O--(CH 2 ) 2 --O--(CH 2 ) 2 --, with the remainder being selected from the group consisting of --(CH 2 ) 2 --, --(CH 2 ) 3 -- and --(CH 2 ) 4 --.
Claim 3
Dependent Claim
38 words
Polyester according to claim 1, wherein R is about 98 to 98.5 mole % para-phenylene and about 1.5 to 2% of the sulfonate radical, and G contains about 15% to 20% by weight of the polyalkylene glycol radical.
Claim 4
Dependent Claim
8 words
A fiber of the polyester of claim 1.
Claim 5
Dependent Claim
8 words
A fiber of the polyester of claim 2.
Claim 6
Dependent Claim
9 words
A non-woven sheet of the polyester of claim 1.
Claim 7
Dependent Claim
9 words
A non-woven sheet of the polyester of claim 2.
Claim 8
Dependent Claim
10 words
A film of the polyester of claim 1 or 2.
Claim 9
Dependent Claim
18 words
A composite film of the polyester of claim 1 or 2 and of a layer of nonwoven sheet.
Claim 10
Dependent Claim
29 words
A disposable diaper which includes an absorbent body portion having on one surface thereof a water permeable nonwoven sheet of fibers of the polyester of claim 1 or 2.
Claim 11
Dependent Claim
26 words
A disposable diaper which includes an absorbent body portion having on one surface thereof a water impermeable film of the polyester of claim 1 or 2.
Claim 12
Dependent Claim
197 words
A fiber and film forming copolyester consisting essentially of about 60%-98% by weight of the copolyester being recurring structural units (1) of the formula --C(O)--R--C(O)--OGO-- wherein R is about 93 to 99.9 mole % para-phenylene and about 0.1 to 2.5 mole % of the sulfonate radical ##STR5## where M is an alkali metal or alkaline earth metal, and wherein G is at least about 13% by weight of a radical of a polyalkylene glycol of molecular weight at least about 250, and up to about 40 mole % of a polyethylene ether radical selected from the group consisting of --(CH 2 ) 2 --O--(CH 2 ) 2 -- and --(CH 2 ) 2 --O--(CH 2 ) 2 --O--(CH 2 ) 2 --, with the remainder being selected from the group consisting of --(CH 2 ) 2 --, --(CH 2 ) 3 -- and --(CH 2 ) 4 --, and about 2% to 40% by weight of the copolyester being structural units (2) of the formula [--C(O)--Q--O--] n , and Q are such that the hydroxy acid HO-13 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 composition temperature.
Claim 13
Dependent Claim
197 words
A fiber and film forming copolyester consisting essentially of about 60%-98% by weight of the copolyester being recurring structural units (1) of the formula --C(O)--R--C(O)--OGO-- wherein R is about 93 to 99.9 mole % para-phenylene and about 0.1 to 2.5 mole % of the sulfonate radical ##STR5## where M is an alkali metal or alkaline earth metal, and wherein G is at least about 13% by weight of a radical of a polyalkylene glycol of molecular weight at least about 250, and up to about 40 mole % of a polyethylene ether radical selected from the group consisting of --(CH 2 ) 2 --O--(CH 2 ) 2 -- and --(CH 2 ) 2 --O--(CH 2 ) 2 --O--(CH 2 ) 2 --, with the remainder being selected from the group consisting of --(CH 2 ) 2 --, --(CH 2 ) 3 -- and --(CH 2 ) 4 --, and about 2% to 40% by weight of the copolyester being structural units (2) of the formula [--C(O)--Q--O--] n , and Q are such that the hydroxy acid HO-13 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 composition temperature.
Claim 14
Dependent Claim
57 words
A copolyester according to claim 11, 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 --, and --C(R')H--CH 2 --, where R' is selected from the group consisting of --CH 3 and --CH 2 --CH 3 .
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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) | 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 |