Patent SU121146A1 successfully refreshed from Google Patents.
US5550173A
Expired / Lapsed
US
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Polyester composition
Assignee: Yield10 Bioscience Inc
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Filing: 1993-11-04
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Granted: 1996-08-27
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Expires: 2013-11-04
Abstract
Abstract PCT No. PCT/GB93/02279 Sec. 371 Date May 5, 1995 Sec. 102(e) Date May 5, 1995 PCT Filed Nov. 4, 1993 PCT Pub. No. WO94/11445 PCT Pub. Date May 26, 1994A polymer composition comprising at least one structural polymer and at least one oligomer of at least one polymer selected from the group; polyhydroxyalkanoates, polylactide, polycaprolactone and co-polymers thereof.
Inventors
- 👤 Timothy Hammond
- 👤 Jasbinder S. Bal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:07
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04; C08L101/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A polymer composition comprising at least one biodegradable microbiologically produced polyhydroxyalkanoate (PHA) having a of molecular weight Mw of at least 50000, having repeating units of formula I: --O--C.sub.m H.sub.n --CO-- I where m is 3 in all said units or m is 3 in some of said units and m is 4 in the remainder of said units; and n is 2m and at least one oligomer selected from the group consisting of hydroxyalkanoate, lactide, caprolactone and co-oligomers thereof.
Claim 2
Dependent Claim
80 words
A polymer composition comprising at least one biodegradable microbiologically produced polyhydroxyalkanoate (PHA) having a of molecular weight Mw of at least 50000, having repeating units of formula I: --O--C.sub.m H.sub.n --CO-- I where m is 3 in all said units or m is 3 in some of said units and m is 4 in the remainder of said units; and n is 2m and at least one oligomer selected from the group consisting of hydroxyalkanoate, lactide, caprolactone and co-oligomers thereof.
Claim 3
Dependent Claim
20 words
A polymer composition according to claim 1 in which the oligomer has an average molecular weight of 2000 or less.
Claim 4
Dependent Claim
52 words
A polymer composition according to claim 2 in which the content of the oligomer is in the range 1 to 40 parts by weight per hundred parts of PHA and the PHA is plasticised thereby to the extent of a decrease of 5° to 30° C. in its glass transition temperature Tg.
Claim 5
Dependent Claim
38 words
A polymer composition according to claim 1 in which the oligomer has an average molecular weight in the range 4000 to 20000 and has a glass transition temperature Tg within 10° C. of the Tg of the PHA.
Claim 6
Dependent Claim
20 words
A polymer composition according to claim 1 in which the oligomer is an oligohydroxyalkanoate derived from a microbiologically produced PHA.
Claim 7
Dependent Claim
52 words
A polymer composition according to claim 1 in which the oligomer has repeating units of formula I: --O--C.sub.m H.sub.n --CO-- I where m is 3 in all said units or m is 3 in some of said units and m is 4 in the remainder of said units; and n is 2m.
Claim 8
Dependent Claim
25 words
A polymer composition according to claim 6 in which m is 3 in at least 70 mol % of the repeating units of said oligomer.
Claim 9
Dependent Claim
24 words
A process of making a composition according to claim 1 which comprises mixing the PHA and the oligomer in the dissolved or molten state.
Claim 10
Dependent Claim
16 words
A method of making shaped articles characterised by using a polymer composition according to claim 1.
Claim 11
Dependent Claim
80 words
An oligohydroxyalkanoate having an average molecular weight Mw in the range 4000 to 25000, which is the product of de-polymerising a microbiologically produced PHA having units of formula I: --O--C.sub.m H.sub.n --CO-- I in which m is 3 in all said units or m is 3 in some of said units and 4 in the remainder of said units, and n is 2m, said PHA being crystallisable to the extent of over 30% and having carboxyalkyl and hydroxy end groups.
Claim 12
Dependent Claim
80 words
An oligohydroxyalkanoate having an average molecular weight Mw in the range 4000 to 25000, which is the product of de-polymerising a microbiologically produced PHA having units of formula I: --O--C.sub.m H.sub.n --CO-- I in which m is 3 in all said units or m is 3 in some of said units and 4 in the remainder of said units, and n is 2m, said PHA being crystallisable to the extent of over 30% and having carboxyalkyl and hydroxy end groups.
Claim 13
Dependent Claim
25 words
A polymer composition according to claim 1 in which m is 3 in at least 70 mol % of the repeating units of said PHA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-27 | 2000-02-26 | 2000-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-27 | 2004-02-26 | 2004-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-27 | 2008-02-26 | 2008-08-27 | $7700.00 | Window Closed / Lapsed |