Patent US5367011A successfully refreshed from Google Patents.
US5367011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of low molecular weight of polybutylene terephthalate/polyester blends with phosphorus compounds
Assignee: SABIC Global Technologies BV
•
Filing: 1993-12-08
•
Granted: 1994-11-22
•
Expires: 2013-12-08
Abstract
Abstract Blends of low molecular weight PBT resin and high molecular weight polyester resin, such as high molecular weight PBT resin, are imparted with excellent melt viscosity stability by the addition of certain phosphorus-containing compounds.
Inventors
- 👤 Eileen B. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:30
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
68 words
A thermoplastic resin blend comprising: (a) a relatively low molecular weight polybutylene terephthalate resin having a melt viscosity of 450 poise; (b) a relatively high molecular weight polyester resin having a melt viscosity of greater than 900 poise; and (c) an effective melt viscosity stabilizing amount of stabilizer selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
Claim 2
Dependent Claim
68 words
A thermoplastic resin blend comprising: (a) a relatively low molecular weight polybutylene terephthalate resin having a melt viscosity of 450 poise; (b) a relatively high molecular weight polyester resin having a melt viscosity of greater than 900 poise; and (c) an effective melt viscosity stabilizing amount of stabilizer selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
Claim 3
Dependent Claim
18 words
A thermoplastic resin blend as defined in claim 1 wherein said component (a) comprises a poly(1,4-butylene terephthalate) resin.
Claim 4
Dependent Claim
18 words
A thermoplastic resin blend as defined in claim 1 wherein said component (b) comprises a poly(1,4-butylene terephthalate) resin.
Claim 5
Dependent Claim
15 words
A thermoplastic resin blend as defined in claim 1 wherein said stabilizer is zinc phosphate.
Claim 6
Dependent Claim
57 words
A thermoplastic resin blend as defined in claim 1 comprising from about 30 to about 70 parts by weight component (a), from about 70 to about 30 parts by weight component (b), and from about 0.1 to about 10 parts by weight component (c) based on 100 total parts by weight of components (a), (b) and (c).
Claim 7
Dependent Claim
28 words
A thermoplastic resin blend as defined in claim 1 further comprising (d) a thermoplastic resin selected from polycarbonates, polyester carbonates, polyarylates and mixtures of any of the foregoing.
Claim 8
Dependent Claim
17 words
A thermoplastic resin blend as defined in claim 6 wherein said component (d) comprises a poly(bisphenol A)carbonate.
Claim 9
Dependent Claim
24 words
A thermoplastic resin blend as defined in claim 1 further comprising (e) a reinforcing agent comprising glass fibers, talc, mica, clay or mixtures thereof.
Claim 10
Dependent Claim
16 words
A thermoplastic resin blend as defined in claim 1 further comprising (f) a flame retardant agent.
Claim 11
Dependent Claim
33 words
A thermoplastic resin blend as defined in claim 1 further comprising (g) an additive selected from impact modifiers, pigments, fillers, plasticizers, processing aids, UV stabilizers, antioxidants and mixtures of any of the foregoing.
Claim 12
Dependent Claim
11 words
An article prepared from a composition as defined in claim 1.
Claim 13
Dependent Claim
17 words
The thermoplastic resin blend of claim 1, wherein said relatively high molecular weight polyester comprises polybutylene terephthalate.
Claim 14
Dependent Claim
84 words
A process for stabilizing the melt viscosity of a thermoplastic resin blend comprising a relatively low molecular weight polybutylene terephthalate resin having a melt viscosity of less than 450 poise and a relatively high molecular weight polyester resin having a melt viscosity of greater than 900 poise, said process comprising adding to said blend an effective melt viscosity stabilizing amount of a phosphorus compound selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
Claim 15
Dependent Claim
84 words
A process for stabilizing the melt viscosity of a thermoplastic resin blend comprising a relatively low molecular weight polybutylene terephthalate resin having a melt viscosity of less than 450 poise and a relatively high molecular weight polyester resin having a melt viscosity of greater than 900 poise, said process comprising adding to said blend an effective melt viscosity stabilizing amount of a phosphorus compound selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
Claim 16
Dependent Claim
16 words
A thermoplastic resin blend as defined in claim 13 wherein said phosphorus compound is zinc phosphate.
Claim 17
Dependent Claim
76 words
A thermoplastic resin blend having improved melt viscosity stability consisting essentially of (a) a low molecular weight polybutylene terephthalate resin having a melt viscosity of less than 450 poise; (b) a high molecular weight polyester resin having a melt viscosity of greater than 900 poise; and (c) an effective melt viscosity stabilizing amount of a stabilizer selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
Claim 18
Dependent Claim
76 words
A thermoplastic resin blend having improved melt viscosity stability consisting essentially of (a) a low molecular weight polybutylene terephthalate resin having a melt viscosity of less than 450 poise; (b) a high molecular weight polyester resin having a melt viscosity of greater than 900 poise; and (c) an effective melt viscosity stabilizing amount of a stabilizer selected from the group consisting of acidic phosphate salts, Group IB metal phosphate salts, and Group IIB metal phosphate salts.
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |