US3985728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxymethylated materials derived from wood molasses and process for making same
Assignee: Westvaco Corp
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Filing: 1974-01-02
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Granted: 1976-10-12
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Expires: 1994-01-02
Abstract
Abstract There is disclosed herein carboxymethylated wood molasses and a process for producing this material in an aqueous system to produce an oligomeric, ligno-carbohydrate material useful as a detergent builder, herbicide dispersant, corrosion control agent and de-rusting chemical.
Inventors
- 👤 Stephen Y. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:13
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/286; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
25 words
An oligomeric carboxymethyl wood molasses, the amount of carboxymethylation being about 50 parts by weight to 200 parts by weight per 100 parts wood molasses.
Claim 2
Dependent Claim
25 words
An oligomeric carboxymethyl wood molasses, the amount of carboxymethylation being about 50 parts by weight to 200 parts by weight per 100 parts wood molasses.
Claim 3
Dependent Claim
24 words
The product of claim 1 wherein said carboxymethylation is from 100 parts by weight to 150 parts by weight per 100 parts wood molasses.
Claim 4
Dependent Claim
16 words
The product of claim 1 wherein the product has a moisture content below 20% by weight.
Claim 5
Dependent Claim
10 words
The product of claim 3 wherein said product is water-soluble.
Claim 6
Dependent Claim
26 words
The product of claim 1, wherein said wood molasses is from that part of alkaline pulping liquors which consists primarily of saccharinic acids and ligno-carbohydrates complexes.
Claim 7
Dependent Claim
27 words
The product of claim 1 wherein said wood molasses is from the steam treatment of wood chips and sawdusts whereupon the readily hydrolyzable hemicelluloses are rendered water-soluble.
Claim 8
Dependent Claim
22 words
The product of claim 1 wherein said wood molasses is from the black liquor from sodium carbonate semi-chemical pulping of woody materials.
Claim 9
Dependent Claim
38 words
The product of claim 1 having been treated with up to 0.2 grams/1 gram of product with a chemical from the group consisting essentially of sodium borohydride, sodium dithionite, bromine and hydrogen peroxide to reduce the color thereof.
Claim 10
Dependent Claim
20 words
The product of claim 1 having a calcium complexing value of at least 0.7 × 10.sup. -3 moles per gram.
Claim 11
Dependent Claim
74 words
The process of producing carboxymethylated wood molasses which comprises, reacting in an aqueous system wood molasses at a solids content of 50 to 75% by weight with 50 to 150 parts sodium hydroxide per 100 parts wood molasses until a fluid mixture is formed, and adding with stirring 50 parts to 200 parts sodium chloroacetate per 100 parts wood molasses at a temperature between 25° and 100° C. for 1 hour to 24 hours.
Claim 12
Dependent Claim
74 words
The process of producing carboxymethylated wood molasses which comprises, reacting in an aqueous system wood molasses at a solids content of 50 to 75% by weight with 50 to 150 parts sodium hydroxide per 100 parts wood molasses until a fluid mixture is formed, and adding with stirring 50 parts to 200 parts sodium chloroacetate per 100 parts wood molasses at a temperature between 25° and 100° C. for 1 hour to 24 hours.
Claim 13
Dependent Claim
34 words
The process of claim 10 wherein said sodium chloroacetate is present at 100 parts to 150 parts by weight per 100 parts of wood molasses, and said time is 2 hours to 4 hours.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |