Patent US3872055A successfully refreshed from Google Patents.
US3872055A
Expired / Lapsed
US
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Polyamide composition having decreased gel-forming property in molten state
Assignee: Toyobo Co Ltd
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Filing: 1973-08-15
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Granted: 1975-03-18
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Expires: 1993-08-15
Abstract
Abstract AND (B) at least one alkali metal compound of the formula: AND (4) PHOSPHOROUS ACID COMPOUNDS OF THE FORMULA: (3) PHOSPHONIC ACID COMPOUNDS OF THE FORMULA: (2) PHOSPHOROUS ACID COMPOUNDS OF THE FORMULA: A polyamide composition having a decreased gel-forming property in a molten state which comprises a polyamide, (A) at least one phosphorous compound selected from the group consisting of (1) phosphinic acid compounds of the formula:
Inventors
- 👤 Kaoru Furukawa
- 👤 Chiaki Isukamoto
- 👤 Hiroshi Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:58
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
A POLYAMIDE COMPOSITION WHICH COMPRISES A POLYAMIDE; AT LEAST ONE PHOSPHORUS COMPONENT (A) SELECTED FROM THE GROUP CONSISTING OF (1) A PHOSPHINIC ACID COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
27 words
A POLYAMIDE COMPOSITION WHICH COMPRISES A POLYAMIDE; AT LEAST ONE PHOSPHORUS COMPONENT (A) SELECTED FROM THE GROUP CONSISTING OF (1) A PHOSPHINIC ACID COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
21 words
The polyamide composition according to claim 1, which additionally comprises at least one dicarboxylic acid anhydride component (C) of the formula
Claim 4
Dependent Claim
54 words
The polyamide composition according to claim 1 wherein the amount of the component (A) is 100 to 500 ppm in terms of phosphorus based on the weight of the polyamide and the amount of the component (B) is 2 to 4 mole in terms of alkali metal per 1 mole of the component (A).
Claim 5
Dependent Claim
28 words
The polyamide composition according to claim 2, wherein the amount of the component (C) is 0.1 to 1 % by weight based on the weight of the polyamide.
Claim 6
Dependent Claim
38 words
The polyamide composition according to claim 1, which comprises additionally (D) at least one o-phenylenediamine and/or its derivatives, the amount of the component (D) being 0.01 to 2 % by weight based on the weight of the polyamide.
Claim 7
Dependent Claim
28 words
The polyamide composition accordint to claim 5, wherein the amount of the component (D) is 0.1 to 1 % by weight based on the weight of the polyamide.
References Cited (Backward Citations)
US2884414A
Cited
US2906726A
Cited
US3240751A
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US3202622A
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US3260697A
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US3274151A
Cited
US3533986A
Cited
US3384615A
Cited
US3640970A
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US3595829A
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US3692867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |