US4378444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding material
Assignee: EIDP Inc
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Filing: 1982-05-12
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Granted: 1983-03-29
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Expires: 2002-05-12
Abstract
Abstract Use of a selected sulfonamide has been found to reduce mold deposits and to lower volatility without impairing crystallization rates of polyethylene terephthalate molding blend which contains an ionic hydrocarbon copolymer or ionic salt of a hydrocarbon acid, over polyethylene terephthalate blends which contained the ionic component and other additives.
Inventors
- 👤 Sumner A. Barenberg
- 👤 Frank P. Gay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:26
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K5/36; C08K5/43; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
A polyethylene terephthalate molding blend consisting essentially of (a) 20-90% by weight of blend of polyethylene terephthalate having an inherent viscosity of at least 0.4 dl/g, (b) 0-50% by weight of blend of a reinforcing or filling material, (c) 1-10% by weight of blend of at least one sodium or potassium salt of a hydrocarbon carboxylic acid of 9-25 carbon atoms or at least one sodium or potassium salt of an ionic hydrocarbon copolymer of an α-olefin of 2-5 carbon atoms and an α,β-ethylenically unsaturated carboxylic acid of 3-5 carbon atoms in which the carboxyl groups have been at least partially neutralized with Na + or K + cations, provided the amount of copolymer present is sufficient to provide a ΔH H /ΔH c ratio of less than 0.25 to the blend, (d) 1-10% by weight of blend of at least one para-n-alkyl toluene sulfonamide of the formula ##STR4## wherein R is n-alkyl or n-alkenyl of 14-16 carbon atoms, or if a mixture of sulfonamides is present, R can contain 14-18 carbon atoms provided that the sulfonamide in which R is 18 carbon atoms is present in an amount less than 70% by weight of the total sulfonamides present, provided also that the amount of sulfonamide present is sufficient to lower the Tpk of a blend of (a), (b) and (c) by at least about 4° C.
Claim 2
Dependent Claim
227 words
A polyethylene terephthalate molding blend consisting essentially of (a) 20-90% by weight of blend of polyethylene terephthalate having an inherent viscosity of at least 0.4 dl/g, (b) 0-50% by weight of blend of a reinforcing or filling material, (c) 1-10% by weight of blend of at least one sodium or potassium salt of a hydrocarbon carboxylic acid of 9-25 carbon atoms or at least one sodium or potassium salt of an ionic hydrocarbon copolymer of an α-olefin of 2-5 carbon atoms and an α,β-ethylenically unsaturated carboxylic acid of 3-5 carbon atoms in which the carboxyl groups have been at least partially neutralized with Na + or K + cations, provided the amount of copolymer present is sufficient to provide a ΔH H /ΔH c ratio of less than 0.25 to the blend, (d) 1-10% by weight of blend of at least one para-n-alkyl toluene sulfonamide of the formula ##STR4## wherein R is n-alkyl or n-alkenyl of 14-16 carbon atoms, or if a mixture of sulfonamides is present, R can contain 14-18 carbon atoms provided that the sulfonamide in which R is 18 carbon atoms is present in an amount less than 70% by weight of the total sulfonamides present, provided also that the amount of sulfonamide present is sufficient to lower the Tpk of a blend of (a), (b) and (c) by at least about 4° C.
Claim 3
Dependent Claim
31 words
The blend of claim 1 wherein the reinforcing or filling material is present in an amount of between about 15 and 50 percent by weight of blend and is glass fiber.
Claim 4
Dependent Claim
23 words
The blend of claim 1 wherein component (c) is a sodium or potassium salt of the ionic hydrocarbon copolymer defined in claim 1.
Claim 5
Dependent Claim
25 words
The blend of claim 3 wherein the sodium or potassium salt is the salt of a copolymer of an olefin and acrylic or methacrylic acid.
Claim 6
Dependent Claim
23 words
The blend of claims 1, 2, 3 or 4 wherein the sulfonamide is one in which R is n-alkyl of 14-16 carbon atoms.
Claim 7
Dependent Claim
53 words
The blend of claims 1,2, 3 or 4 wherein the sulfonamide is a mixture of sulfonamides in which R is alkyl of 14, 16 and 18 carbon atoms in which the amount of the sulfonamide wherein R is 18 is not over 70% by weight of the total weight of the sulfonamides present.
Claim 8
Dependent Claim
12 words
The blend of claim 1 in the form of a melt-extruded blend.
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) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |