US5250333A
Expired / Lapsed
US
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Modified polyethylene terephthalate
Assignee: Invista North America LLC
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Filing: 1992-10-26
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Granted: 1993-10-05
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Expires: 2012-10-26
Abstract
Abstract A modified polyethylene terephthalate is provided. Modification is provided by the incorporation of an alkoxylated polyol. The modified PET is melt-strength enhanced and extrusion blow-moldable. The modified PET may contain units derived from 2,6-napthalenedicarboxylic acid, and be useful for making bottles or containers having hot fill applications. Reduced yellowness is advantageously provided.
Inventors
- 👤 Gerald W. McNeely
- 👤 Aylmer J. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; B; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B29; B29K; B29K2067/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
25 words
Polyethylene terephthalate modified by the incorporation of a small amount of an alkoxylated polyol prepared from a polyol having at least three primary hydroxyl groups.
Claim 2
Dependent Claim
25 words
Polyethylene terephthalate modified by the incorporation of a small amount of an alkoxylated polyol prepared from a polyol having at least three primary hydroxyl groups.
Claim 3
Dependent Claim
25 words
The polyethylene terephthalate of claim 1, comprising about 0.1 to 30 wt. %, based upon the total acid units, of at least one co-monomeric diacid.
Claim 4
Dependent Claim
18 words
The polyethylene terephthalate of claim 1, wherein said at least one co-monomeric diacid is an aromatic dicarboxylic acid.
Claim 5
Dependent Claim
22 words
The polyethylene terephthalate of claim 1, comprising about 5 to 30 wt. %, based upon the total acid units, of 2,6-naphthalenedicarboxylic acid.
Claim 6
Dependent Claim
22 words
The polyethylene terephthalate of claim 1, comprising about 0.1 to 5 wt. %, based upon the total acid units, of isophthalic acid.
Claim 7
Dependent Claim
16 words
The polyethylene terephthalate of claim 1, wherein said polyol has three or four primary hydroxyl groups.
Claim 8
Dependent Claim
42 words
The polyethylene terephthalate of claim 1, wherein said polyol is of the formula R(CH.sub.2 OH).sub.n , wherein R is a saturated aliphatic hydrocarbon radical containing from 1 to 6 carbon atoms, or a phenyl moiety, and wherein n is 3 or 4.
Claim 9
Dependent Claim
45 words
The polyethylene terephthalate of claim 1, wherein said polyol is of the formula R.sup.2 -C(CH.sub.2 OH).sub.m, wherein R 2 is an alkyl group of from 1 to 6 carbon atoms such as methyl or ethyl, or is a hydroxymethylene moiety, and wherein m is 3.
Claim 10
Dependent Claim
13 words
The polyethylene terephthalate of claim 1, wherein said alkoxylated polyol is ethoxylated trimethylolpropane.
Claim 11
Dependent Claim
27 words
The polyethylene terephthalate of claim 1, wherein said alkoxylated polyol has an average number of alkoxy moieties per polyol in the range of about 3 to 20.
Claim 12
Dependent Claim
20 words
The polyethylene terephthalate of claim 1, wherein said amount of alkoxylated polyol ranges from about 100 ppm to 50,000 ppm.
Claim 13
Dependent Claim
11 words
A container made from the modified polyethylene terephthalate of claim 1.
Claim 14
Dependent Claim
11 words
A container made from the modified polyethylene terephthalate of claim 4.
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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) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |