US3917740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of polyamides by adding polyethyleneglycol having a low index of dispersion
Assignee: SNIA Viscosa SpA
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Filing: 1973-03-28
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Granted: 1975-11-04
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Expires: 1993-03-28
Abstract
Abstract An antistatic additive for polyamide fibres is disclosed, which is a polyoxyethylene having an average molecular weight of 20,000 and a very narrow range of molecular weight, the molecular dispersion index ranging from 1.02 to 1.2. The antistatic mode of action of the additive according to the invention is not completely elucidated, but outstanding and persistent antistatic properties have been experimentally ascertained. The maximum amount to be used is 0.5% by weight with respect to the polymer; higher amounts are in no wise detrimental, but afford no advantage.
Inventors
- 👤 Francesco Siclari
- 👤 Alo Bruno D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:33
CPC Classifications
C; C08; C08L; C08L77/00; Y; Y10; Y10S; Y10S524/00; Y10S524/91; Y10S524/914
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A METHOD FOR THE PRODUCTION OF POLYAMIDES FOR TESTILE USAGE HAVING IMPROVED ANTISTATIC PROPERTIES OF HIGH PERSISTENCE IN SPITE OF WEAR AND REPEATED WASHINGS, COMPRISING ADDING TO A POLYMERIC OR POLYMERIZABLE AMIDE COMPOUND, AS THE SOLE ANTISTATIC ADDITIVE A POLYOXYETHYENEGLYCOL, UNDER CONDITIONS OF SUBSTANTIAL UNIFORMITY, AND IN AN AMOUNT ON A WEIGHT BASIS BETWEEN 0.40% AND 1.5% SAID POLYOXYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT IN THE ORDER OF 20,000 WITH ALL THE MOLECULES CLOSE TO THAT WEIGHT, AND HIGH UNIFORMITY AS DEFINED BY AN INDEX OF MOLECULAR DISPERSION BETWEEN 1.02 AND 1.2
Claim 2
Independent Claim
93 words
A METHOD FOR THE PRODUCTION OF POLYAMIDES FOR TESTILE USAGE HAVING IMPROVED ANTISTATIC PROPERTIES OF HIGH PERSISTENCE IN SPITE OF WEAR AND REPEATED WASHINGS, COMPRISING ADDING TO A POLYMERIC OR POLYMERIZABLE AMIDE COMPOUND, AS THE SOLE ANTISTATIC ADDITIVE A POLYOXYETHYENEGLYCOL, UNDER CONDITIONS OF SUBSTANTIAL UNIFORMITY, AND IN AN AMOUNT ON A WEIGHT BASIS BETWEEN 0.40% AND 1.5% SAID POLYOXYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT IN THE ORDER OF 20,000 WITH ALL THE MOLECULES CLOSE TO THAT WEIGHT, AND HIGH UNIFORMITY AS DEFINED BY AN INDEX OF MOLECULAR DISPERSION BETWEEN 1.02 AND 1.2
Claim 3
Dependent Claim
19 words
A method according to claim 1, wherein the polyoxyethylene glycol is added in an amount between 0.40% and 0.50%.
Claim 4
Dependent Claim
11 words
A method according to claim 1, wherein the polyamide is caprolactam.
Claim 5
Dependent Claim
72 words
Polyamide textile filaments and yarns having improved antistatic properties of high resistance to wear and repeated washings, containing a polyoxyethyleneglycol as the sole antistatic additive in a substantially homogeneous, even dispersion 0.4% to 1.5% of said polyoxyethylene glycol having an average molecular weight in the order of 20,000, with all the molecules close to that weight and a high uniformity as defined by an index of molecular dispersion between 1.02 and 1.2.
Claim 6
Dependent Claim
72 words
Polyamide textile filaments and yarns having improved antistatic properties of high resistance to wear and repeated washings, containing a polyoxyethyleneglycol as the sole antistatic additive in a substantially homogeneous, even dispersion 0.4% to 1.5% of said polyoxyethylene glycol having an average molecular weight in the order of 20,000, with all the molecules close to that weight and a high uniformity as defined by an index of molecular dispersion between 1.02 and 1.2.
Claim 7
Dependent Claim
19 words
Polyamide textile filaments and yarns according to claim 4, containing 0.5% of polyoxyethylene glycol with respect to the polymer.
Claim 8
Dependent Claim
14 words
Polyamide textile filaments and yarns according to claim 4, wherein the polyamide is caprolactam.
Claim 9
Dependent Claim
17 words
As a new article of manufacture a textile article formed by polyamide filaments according to claim 4.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |