US3622261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buffered aldehyde fixation composition
Assignee: Westpoint Pepperell Inc
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Filing: 1968-09-16
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Granted: 1971-11-23
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Expires: 1988-09-16
Abstract
Abstract The process of fixing formaldehyde on cellulose or a cellulose ester with the aid of a carbamate and using glycolic acid in the catalyst system is improved by including a buffering agent. Preferably there is also included a hexitol as a scavenger for unreacted formaldehyde.
Inventors
- 👤 James F Cotton
- 👤 John W Reed
- 👤 Water C Monk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:59
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; C; C08; C08B; C08B15/00; C08B15/05; C08B15/06; D06M13/322; D06M13/402; D06M13/425; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
28 words
A process according to claim 1 wherein the treating solution includes a water soluble salt of a polyvalent metal capable of catalyzing the reaction between cellulose and formaldehyde.
Claim 2
Dependent Claim
25 words
A process according to claim 1 wherein the treating solution includes water soluble sugar alcohol selected from the group consisting of pentitols, hexitols and heptitols.
Claim 3
Dependent Claim
46 words
A process according to claim 1 wherein the buffer includes an alkali metal phosphate, the aqueous mixture includes alkali metal bisulfite in an amount sufficient to reduce formaldehyde odor and also includes dimethyl sulfone in an amount of 0.1 to 5 percent to raise the pH.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein the polymer is in the form of fibers.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein the buffer includes an alkali metal phosphate.
Claim 6
Dependent Claim
12 words
A process according to claim 6 wherein the phosphate comprises monosodium phosphate.
Claim 7
Dependent Claim
12 words
A process according to claim 6 wherein the phosphate comprises disodium phosphate.
Claim 8
Dependent Claim
16 words
A process according to claim 5 wherein the fibers are in the form of a fabric.
Claim 9
Dependent Claim
25 words
A process according to claim 6 wherein the aqueous mixture includes dimethyl sulfone in an amount effective to raise the pH of the treated polymer.
Claim 10
Dependent Claim
12 words
A process according to claim 6 wherein the phosphate comprises trisodium phosphate.
Claim 11
Dependent Claim
13 words
A process according to claim 11 wherein the phosphate also comprises monosodium phosphate.
Claim 12
Dependent Claim
22 words
A process according to claim 6 wherein the aqueous mixture includes alkali metal bisulfite in an amount sufficient to reduce formaldehyde odor.
Claim 13
Dependent Claim
12 words
A process according to claim 13 wherein the bisulfite comprises sodium bisulfite.
Claim 14
Dependent Claim
25 words
A process according to claim 13 wherein the aqueous mixture includes dimethyl sulfone in an amount effective to raise the pH of the treated polymer.
Claim 15
Dependent Claim
25 words
A process according to claim 15 wherein the aqueous mix also contains mannitol as a formaldehyde scavenger and sodium bisulfite to reduce the formaldehyde odor.
Claim 16
Dependent Claim
27 words
A process according to claim 6 wherein the aqueous mix also contains sugar alcohol of the group consisting of pentitols, hexitols and hepitols as a formaldehyde scavenger.
Claim 17
Dependent Claim
12 words
A process according to claim 17 wherein the sugar alcohol comprises mannitol.
Claim 18
Dependent Claim
12 words
A process according to claim 16 wherein the carbamate is methyl carbamate.
Claim 19
Dependent Claim
65 words
A process according to claim 18 wherein the treating mixture comprises 0.1 to 0.75 percent trisodium phosphate calculated as the decahydrate, 1.5 to 15 percent formaldehyde, 0.1 to 1 percent monosodium phosphate, sodium bisulfite in an amount of 0.25 percent to not more than 1 part for each two parts formaldehyde, 0.1 to 5 percent of the carbamate, 0.1 to 1.5 percent of glycolic acid.
Claim 20
Dependent Claim
32 words
A process according to claim 1 comprising treating a cellulose fabric with an aqueous mixture of (1) formaldehyde, (2) methyl carbamate or ethyl cArbamate, glycolic acid and an alkali metal phosphate buffer.
Claim 21
Dependent Claim
12 words
A process according to claim 21 wherein the buffer comprises monosodium phosphate.
Claim 22
Dependent Claim
12 words
A process according to claim 22 wherein the buffer includes trisodium phosphate.
Claim 23
Dependent Claim
20 words
A process according to claim 22 wherein the aqueous mixture also contains sodium bisulfite, magnesium chloride, dimethyl sulfone and mannitol.
Claim 24
Dependent Claim
20 words
A process according to claim 23 wherein the ratio of monosodium phosphate to trisodium phosphate is between 1:1 and 10:1.
Claim 25
Dependent Claim
18 words
A process according to claim 25 wherein the treating solution includes 0.1 to 2.5 percent of magnesium chloride.
References Cited (Backward Citations)
US3196036A
Cited
US3420696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |