Patent US5024792A successfully refreshed from Google Patents.
US5024792A
Expired / Lapsed
US
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Antistatic thermoplastic/polyamide-polyether compositions and antistatic polymeric films made therefrom
Assignee: Cryovac LLC
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Filing: 1989-10-19
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Granted: 1991-06-18
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Expires: 2009-10-19
Abstract
Abstract Disclosed is a film having antistatic characteristics and a method to make the film. The film comprises a blend of polyether block amide copolymer with an aromatic sulfonamide antistatic agent.
Inventors
- 👤 Marvin R. Havens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:49
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/34; C; C08; C08K; C08K5/00; C08K5/36; C08K5/43
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A method for the manufacture of a film having antistatic characteristics comprising admixing a polyether block amide copolymer having a degree of hydrophilicity suitable for packaging electronic devices with an aromatic sulfonamide antistatic agent, wherein said aromatic sulfonamide is substantially non-hygroscopic and substantially non-migratable, and forming a film having at least one layer of the admixture of polyether block amide copolymer with aromatic sulfonamide.
Claim 2
Independent Claim
64 words
A method for the manufacture of a film having antistatic characteristics comprising admixing a polyether block amide copolymer having a degree of hydrophilicity suitable for packaging electronic devices with an aromatic sulfonamide antistatic agent, wherein said aromatic sulfonamide is substantially non-hygroscopic and substantially non-migratable, and forming a film having at least one layer of the admixture of polyether block amide copolymer with aromatic sulfonamide.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein the forming is accomplished by extruding.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein the aromatic sulfonamide is present in the admixture in an amount from about 5% to about 80% by weight.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the aromatic sulfonamide is benzenesulfonamide, N-butyl benzenesulfonamide, o-toluenesulfonamide, p-toluenesulfonamide, N-ethyl-o-toluene sulfonamide, N-ethyl-p-toluenesulfonamide, or mixtures thereof.
Claim 6
Dependent Claim
25 words
The method of claim 1, wherein the polyether block amide copolymer has nylon 12 as its polyamide component and polytetramethylene oxide as its polyether component.
Claim 7
Dependent Claim
13 words
The method of claim 1 further including at least one layer of polyolefin.
Claim 8
Dependent Claim
28 words
The method of claim 6, wherein said polyolefin is in admixture with an antistatic agent chosen from fatty acid esters of polyhydroxy alcohols, polyalkoxylated compounds, or mixtures thereof.
Claim 9
Dependent Claim
44 words
The method of claim 7, wherein the polyalkoxylated compound is selected from the polyethylene oxides, polypropylene oxides, polybutylene oxides, polytetramethylene oxides, the reaction products of polyalkoxylates with fatty acids, the reaction products of polyalkoxylates with fatty acids esters of polyhydroxyl alcohols or mixtures thereof.
Claim 10
Dependent Claim
43 words
The method of claim 8, wherein the polyalkoxylated compound is a fatty compound; and wherein in the fatty acid ester of polyhydroxy alcohol, the polyalkoxylated compound, or mixture thereof, each fatty group chain comprises a carbon chain from about C 8 and above.
Claim 11
Dependent Claim
22 words
The method of claim 6, further including in the polyolefin admixture an antiblock in a weight amount of about 10% or less.
Claim 12
Dependent Claim
19 words
The method of claim 6, wherein the polyolefin is LDPE, MDPE, HDPE, LLDPE, VLDPE, EVA, PP or mixtures thereof.
Claim 13
Dependent Claim
18 words
The method of claim 1, further including irradiating said film at a dosage up to about 20 MR.
Claim 14
Dependent Claim
10 words
The method of claim 1, further including orienting said film.
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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) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |