US4273693A
Expired / Lapsed
US
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Preparation of furan polymers
Assignee: Ashland Inc
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Filing: 1980-03-19
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Granted: 1981-06-16
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Expires: 2000-03-19
Abstract
Abstract A process for preparing a water-compatible furan polymer which includes subjecting a composition containing at least one saturated aliphatic monohydric alcohol; water; furfuryl alcohol; aldehyde; and nitrogen-containing compound to condensation reaction at an acidic pH; and the product obtained thereby.
Inventors
- 👤 Young D. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:51
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/224; C; C08; C08G; C08G16/00; C08G16/02; C08G16/025; C08G16/0256; C08G16/0262
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
122 words
A process for preparing a water-compatible nitrogen-containing furan polymer which comprises: providing a composition containing at least one saturated aliphatic monohydric alcohol having 1-3 carbon atoms, water, furfuryl alcohol, and aldehyde; subjecting the composition to condensation reaction at an acidic pH in the presence of an acidic catalyst until the free aldehyde content is about 18 to about 22% by weight; adding a nitrogen-containing compound containing at least one ##STR4## when said free aldehyde content is about 18 to about 22% by weight; and then continuing the condensation reaction at an acidic pH for a time sufficient to provide a polymer composition having a viscosity of about 0.5 to bout 7 strokes at 25° C., and thereby obtaining said water-compatible furan polymer.
Claim 2
Dependent Claim
122 words
A process for preparing a water-compatible nitrogen-containing furan polymer which comprises: providing a composition containing at least one saturated aliphatic monohydric alcohol having 1-3 carbon atoms, water, furfuryl alcohol, and aldehyde; subjecting the composition to condensation reaction at an acidic pH in the presence of an acidic catalyst until the free aldehyde content is about 18 to about 22% by weight; adding a nitrogen-containing compound containing at least one ##STR4## when said free aldehyde content is about 18 to about 22% by weight; and then continuing the condensation reaction at an acidic pH for a time sufficient to provide a polymer composition having a viscosity of about 0.5 to bout 7 strokes at 25° C., and thereby obtaining said water-compatible furan polymer.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said alcohol is selected from the group of methanol, ethanol, n-propanol, isopropanol, or mixtures thereof.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein said alcohol is methanol.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein said aldehyde is formaldehyde.
Claim 6
Dependent Claim
23 words
The composition of claim 1 wherein said nitrogen-containing compound is selected from the group of urea, thiourea, dicyandiamide, melamine, benzoguanamine, or mixtures thereof.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said nitrogen-containing compound is urea.
Claim 8
Dependent Claim
29 words
The composition of claim 1 wherein at least a portion of said aldehyde and said nitrogen-containing compound is incorporated as a precondensate of said aldehyde and said nitrogen-containing compound.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein said precondensate is a precondensate of urea-formaldehyde.
Claim 10
Dependent Claim
30 words
The process of claim 9 wherein said precondensate of urea-formaldehyde contains about 60% by weight of formaldehyde, about 25% by weight of urea, and about 15% by weight of water.
Claim 11
Dependent Claim
84 words
The process of claim 1 wherein said alcohol is present in an amount from about 1 to about 20% by weight, said water is present in an amount from about 5 to about 20% by weight, said furfuryl alcohol is present in an amount from about 20 to about 50% by weight, said aldehyde is present in an amount from about 15 to about 40% by weight, and said nitrogen-containing compound is present in an amount from about 4 to about 35% by weight.
Claim 12
Dependent Claim
84 words
The process of claim 1 wherein said alcohol is present in an amount from about 1 to about 10% by weight, said water is present in an amount from about 8 to about 15% by weight, said furfuryl alcohol is present in an amount from about 25 to about 50% by weight, said aldehyde is present in an amount from about 20 to about 30% by weight, and said nitrogen-containing compound is present in an amount from about 15 to about 25% by weight.
Claim 13
Dependent Claim
21 words
The process of claim 11 wherein said alcohol is present in an amount from about 2 to about 8% by weight.
Claim 14
Dependent Claim
23 words
The process of claim 9 wherein said precondensate of urea-formaldehyde is present in an amount from about 20 to about 50% by weight.
Claim 15
Dependent Claim
23 words
The process of claim 9 wherein said precondensate of urea-formaldehyde is present in an amount of about 25 to about 40% by weight.
Claim 16
Dependent Claim
19 words
The process of claim 9 which further includes incorporating about 2 to about 10% by weight of free formaldehyde.
Claim 17
Dependent Claim
19 words
The process of claim 8 wherein said precondensate of urea-formaldehyde is present during the initial stages of the reaction.
Claim 18
Dependent Claim
27 words
The process of claim 16 wherein said initial stages are carried out in the presence of a basic catalyst under pH conditions of about 6.5 to 8.
Claim 19
Dependent Claim
11 words
The process of claim 17 wherein said basic catalyst is triethanolamine.
Claim 20
Dependent Claim
12 words
The process of claim 17 wherein said basic catalyst is sodium hydroxide.
Claim 21
Dependent Claim
30 words
The process of claim 17 wherein said basic catalyst is present in an amount from about 0.1 to about 5% by weight based upon the weight of the reaction composition.
Claim 22
Dependent Claim
30 words
The process of claim 17 wherein said basic catalyst is present in an amount from about 0.1 to about 1% by weight based upon the weight of the reaction composition.
Claim 23
Dependent Claim
27 words
The process of claim 1 wherein the condensation with the pH conditions of about 6.5 to about 8 is carried our for up to about 3/4 hour.
Claim 24
Dependent Claim
16 words
The process of claim 1 wherein said acidic pH conditions are about 4 to about 5.5.
Claim 25
Dependent Claim
16 words
The process of claim 1 wherein said acidic pH conditions are about 4.5 to about 5.5.
Claim 26
Dependent Claim
12 words
The process of claim 1 wherein said acidic catalyst is formic acid.
Claim 27
Dependent Claim
32 words
The process of claim 16 wherein about 50 to about 75% by weight of said nitrogen-containing compound is added when said free aldehyde content is about 18 to about 22% by weight.
Claim 28
Dependent Claim
14 words
The process of claim 1 wherein said nitrogen-containing compound contains at least one ##STR5##
Claim 29
Dependent Claim
9 words
The product obtained by the process of claim 1.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |