US4166897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus-containing condensation products, their production and their use as flame retardants
Assignee: Toyobo Co Ltd
•
Filing: 1976-08-02
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Granted: 1979-09-04
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Expires: 1996-08-02
Abstract
Abstract Process for producing a water-soluble phosphorus-containing condensation product having a molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of 0.8-4.0 by heating a tetrakis(hydroxymethyl)phosphonium compound under reduced pressure and acid conditions to condense it by dehydration and deformaldehydation reaction. This condensation product can be used for rendering textile articles flame retardant.
Inventors
- 👤 Kohei Umetani
- 👤 Masakazu Date
- 👤 Kiyonori Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:31
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5449; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
56 words
A process for producing a water-soluble phosphorus-containing condensation product having a molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of 0.8-4.0, which comprises heating a tetrakis(hydroxymethyl)phosphonium compound under acid conditions at a temperature exceeding 150° C. and a pressure below 100 mm Hg to condense said phosphonium compound by dehydration and deformaldehydation reaction.
Claim 2
Dependent Claim
56 words
A process for producing a water-soluble phosphorus-containing condensation product having a molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of 0.8-4.0, which comprises heating a tetrakis(hydroxymethyl)phosphonium compound under acid conditions at a temperature exceeding 150° C. and a pressure below 100 mm Hg to condense said phosphonium compound by dehydration and deformaldehydation reaction.
Claim 3
Dependent Claim
28 words
The process as claimed in claim 1 wherein the molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of said water-soluble phosphorus-containing condensation product is 1.0-2.0.
Claim 4
Dependent Claim
29 words
The process as claimed in claim 1 wherein the heating temperature is a temperature between 151° and 180° C. and the pressure is between 30 and 70 mm Hg.
Claim 5
Dependent Claim
17 words
The process as claimed in claim 1 wherein the tetrakis(hydroxymethyl)phosphonium compound is tetrakis)hydroxymethyl)phosphonium chloride or tetrakis(hydroxymethyl)phosphonium acetate.
Claim 6
Dependent Claim
16 words
The process as claimed in claim 1 wherein the said acid conditions are below pH 4.
Claim 7
Dependent Claim
75 words
A process for producing a water-soluble phosphorus-containing condensation product having a molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of 0.8-4.0, which comprises heating a tetrakis(hydroxymethyl)phosphonium compound under acid conditions in the presence of, as catalyst, 0.001-0.2 mol of an amino group-containing compound per mol of said phosphonium compound, at a temperature exceeding 120° C. and a pressure below 100 mm Hg to condense said phosphonium compound by dehydration and deformaldehydation reaction.
Claim 8
Dependent Claim
75 words
A process for producing a water-soluble phosphorus-containing condensation product having a molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of 0.8-4.0, which comprises heating a tetrakis(hydroxymethyl)phosphonium compound under acid conditions in the presence of, as catalyst, 0.001-0.2 mol of an amino group-containing compound per mol of said phosphonium compound, at a temperature exceeding 120° C. and a pressure below 100 mm Hg to condense said phosphonium compound by dehydration and deformaldehydation reaction.
Claim 9
Dependent Claim
22 words
The process as claimed in claim 6 wherein 0.001-0.02 mol of the amino-group-containing compound is used per mol of the tetrakis(hydroxymethyl)phosphonium compound.
Claim 10
Dependent Claim
20 words
The process as claimed in claim 6 wherein the amino group-containing compound is dicyandiamide, guanidine, urea, ethylene urea or melamine.
Claim 11
Dependent Claim
14 words
The process as claimed in claim 7 wherein the amino group-containing compound is dicyandiamide.
Claim 12
Dependent Claim
28 words
The process as claimed in claim 6 wherein the molar ratio P--CH 2 --P linkage/P--CH 2 OCH 2 --P linkage of said water-soluble phosphorus-containing condensation product is 1.0-2.0.
Claim 13
Dependent Claim
29 words
The process as claimed in claim 6 wherein the heating temperature is a temperature between 135° and 160° C., and the pressure is between 30 and 70 mm Hg.
Claim 14
Dependent Claim
17 words
The process as claimed in claim 6 wherein the tetrakis(hydroxymethyl)phosphonium compound is tetrakis(hydroxymethyl)phosphonium chloride or tetrakis(hydroxymethyl)phosphonium acetate.
Claim 15
Dependent Claim
16 words
The process as claimed in claim 6 wherein the said acid conditions are below pH 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) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |