US5017657A
Expired / Lapsed
US
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Rapidly-crystallizing polyester compositions
Assignee: Enichem SpA
•
Filing: 1989-09-05
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Granted: 1991-05-21
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Expires: 2009-09-05
Abstract
Abstract Rapidly-crystallizing polyester compositions comprising a polyester thermoplastic resin and a styrene polymer having an essentially syndiotactic structure.
Inventors
- 👤 Leonardo Fiore
- 👤 Italo Borghi
- 👤 Andrea Mattiussi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:26
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
30 words
Rapidly-crystallizing polyester compositions comprising a thermoplastic polyester resin and an effective amount of nucleating agent, characterized in that said nucleating agent is a styrene polymer having an essentially syndiotactic structure.
Claim 2
Dependent Claim
30 words
Rapidly-crystallizing polyester compositions comprising a thermoplastic polyester resin and an effective amount of nucleating agent, characterized in that said nucleating agent is a styrene polymer having an essentially syndiotactic structure.
Claim 3
Dependent Claim
28 words
Compositions according to claim 1, wherein the styrene polymer having an essentially syndiotactic structure has a weight average molecular weight in the range of from 25,000 to 1,200,000.
Claim 4
Dependent Claim
24 words
Compositions according to claim 2, wherein the weight average molecular weight of the styrene polymer is in the range of from 100,000 to 800,000.
Claim 5
Dependent Claim
21 words
Compositions according to claim 1, 2, or 3, wherein the styrene polymer has a melting temperature of at least 250° C.
Claim 6
Dependent Claim
24 words
Compositions according to claim 4, wherein the melting temperature of the styrene polymer is in the range of from 260° C. to 275° C.
Claim 7
Dependent Claim
61 words
Compositions according to claim 1, wherein the styrene polymer having an essentially syndiotactic structure is selected from the group consisting of a styrene homopolymer, a homopolymer of a vinyl-aromatic monomer of formula: CH.sub.2 ═CH--R wherein R is an alkyl-aryl radical or a halogen-substituted aryl radical, and a copolymer thereof with up to 30% by weight of a further ethylenically-unsaturated, copolymerizable monomer.
Claim 8
Dependent Claim
68 words
Compositions according to claim 1, wherein the styrene polymer having an essentially syndiotactic structure is polystyrene whose 1 H-N.M.R. spectrum shows chemical shifts of the methynic and methylenic protons respectively centered at 1.9 and 1.4 ppm, and whose residue from extraction with methyl-ethyl-ketone shows, by X-rays, after melting and solidification, highest-intensity reflexes corresponding to interplanar distances of 13.1 Å; 7.6 Å; 6.46 Å; 4.37 Å; and 2.58 Å.
Claim 9
Dependent Claim
68 words
Compositions according to claim 1, wherein the styrene polymer having an essentially syndiotactic structure is poly-paramethylstyrene whose X-ray diffraction spectrum of a stretched fiber shows a repetition period of 5.1 Å along the chain axis, and whose 13 C-N.M.R. spectrum shows a single peak at 140.8 ppm in the region of the chemical shifts of the ring carbon atom linked to the --CH-- group of the main chain.
Claim 10
Dependent Claim
29 words
Compositions according to claim 1, wherein the styrene polymer having an essentially syndiotactic structure is added to the thermoplastic polyester resin in amounts not more than 30% by weight.
Claim 11
Dependent Claim
16 words
Compositions according to claim 9, wherein 0.01% to 10% by weight of styrene polymer is added.
Claim 12
Dependent Claim
16 words
Compositions according to claim 1, wherein the nucleating agent is added as a separately prepared masterbatch.
Claim 13
Dependent Claim
34 words
Compositions according to claim 11, wherein said masterbatch is prepared by compounding the polyester resin with the styrene polymer having an essentially syndiotactic structure in amounts within the range of from 0.5% to 30%.
Claim 14
Dependent Claim
15 words
Compositions according to claim 12, wherein the range is from 2% to 30% by weight.
Claim 15
Dependent Claim
24 words
Compositions according to claims 11, wherein said masterbatch is added to the polyester resin in amounts in the range of from 1 to 50%.
Claim 16
Dependent Claim
15 words
Compositions according to claim 14, wherein from 2 to 20% of the masterbatch is added.
Claim 17
Dependent Claim
21 words
Compositions according to claim 1, wherein the polyester resin is poly-(ethylene terephthalate) or a copolymer thereof containing units deriving from polyoxyethylene-glycol.
References Cited (Backward Citations)
US3673139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |