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US4474694A
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Modified protein adhesive binder and method of producing
Assignee: Nestle Purina PetCare Co
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Filing: 1982-11-08
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Granted: 1984-10-02
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Expires: 2002-11-08
Abstract
Abstract A modified vegetable protein adhesive binder and a process for producing the same is disclosed wherein an alkaline protein dispersion is formed of the protein material and said dispersion is treated with a reducing agent in an amount sufficient to react with the disulfide bonds of the protein material in said dispersion. Initial treatment of the protein material with a reducing agent is followed by reaction of the treated dispersion with a carboxylic acid anhydride such as dicarboxylic acid anhydride, preferably phthalic anhydride in an amount sufficient to modify the protein material such that resultant alkali dispersions of the modified unhydrolyzed protein material have a relatively high viscosity but when used in paper coating compositions containing pigment and other materials such as latex produce relatively low and desirable coating viscosities. Improvements in pick strength, gloss, water holding and ink receptivity of coatings produced with the modified binder of the present invention is achieved.
Inventors
- 👤 Charles E. Coco
- 👤 Paul M. Graham
- 👤 Thomas L. Krinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:02
CPC Classifications
C; C08; C08H; C08H1/00; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/50
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
82 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material, c. reacting said treated dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
Claim 2
Dependent Claim
82 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material, c. reacting said treated dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the alkaline dispersion has a pH between about 10 and 12.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the alkaline protein dispersion has a proteinaceous solids content of between about 0-14% by weight.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said reducing agent is a compound having a free sulfhydryl group.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein said reducing agent is selected from the group consisting of thioglycolic acid, salts of thioglycolic acid, sulfur dioxide, sodium sulfide, and sodium thiosulfate.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said reducing agent is ammonium thioglycolate.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein said amount of reducing agent is at least a stoichiometric amount with the disulfide bond level of said protein material.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the amount of reducing agent is between about 0.5 and 2% by weight of the alkaline dispersion.
Claim 10
Dependent Claim
23 words
The process of claim 8 wherein the amount of reducing agent is between about 1 and 1.5% by weight of the protein dispersion.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein said carboxylic acid anhydride is a dicarboxylic acid anhydride.
Claim 12
Dependent Claim
22 words
The process of claim 10 wherein the dicarboxylic acid anhydride is selected from the group consisting of succinic anhydride and phthalic anhydride.
Claim 13
Dependent Claim
23 words
The process of claim 1 wherein the amount of carboxylic acid anhydride is at least about 5% by weight of the protein dispersion.
Claim 14
Dependent Claim
25 words
The process of claim 12 wherein the amount of carboxylic acid anhydride is between about 7.5 and 10% by weight of the alkaline protein dispersion.
Claim 15
Dependent Claim
26 words
The process of claim 1 including the step of adjusting the pH of the treated dispersion of the isoelectric point to precipitate the modified protein material.
Claim 16
Dependent Claim
15 words
The process of claim 14 including the step of dewatering the precipitated, modified protein material.
Claim 17
Dependent Claim
95 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a substantially unhydrolyzed vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material, c. maintaining said protein material in a substantially unhydrolyzed condition, and d. reacting said treated dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
Claim 18
Dependent Claim
95 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a substantially unhydrolyzed vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material, c. maintaining said protein material in a substantially unhydrolyzed condition, and d. reacting said treated dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
Claim 19
Dependent Claim
18 words
The process of claim 16 wherein the alkaline dispersion has a pH of between about 10 and 12.
Claim 20
Dependent Claim
21 words
The process of claim 16 wherein the alkaline protein dispersion has a proteinaceous solids content of between about 0-14% by weight.
Claim 21
Dependent Claim
17 words
The process of claim 16 wherein said reducing agent is a compound having a free sulfhydryl group.
Claim 22
Dependent Claim
37 words
The process of claim 16 wherein said reducing agent is selected from the group consisting of thioglycolic acid, salts of thioglycolic acid, sulfur dioxide, sodium sulfide, and sodium thiosulfate, mercaptoethanol and other compounds containing free sulfhydryl groups.
Claim 23
Dependent Claim
12 words
The process of claim 16 wherein said reducing agent is ammonium thioglycolate.
Claim 24
Dependent Claim
26 words
The process of claim 16 wherein said amount of reducing agent is at least a stoichiometric amount with the disulfide bond level of said protein material.
Claim 25
Dependent Claim
23 words
The process of claim 16 wherein the amount of reducing agent is between about 0.5 and 2% by weight of the alkaline dispersion.
Claim 26
Dependent Claim
23 words
The process of claim 23 wherein the amount of reducing agent is between about 1 and 1.5% by weight of the protein dispersion.
Claim 27
Dependent Claim
15 words
The process of claim 16 wherein said carboxylic acid anhydride is a dicarboxylic acid anhydride.
Claim 28
Dependent Claim
22 words
The process of claim 25 wherein the dicarboxylic acid anhydride is selected from the group consisting of succinic anhydride and phthalic anhydride.
Claim 29
Dependent Claim
23 words
The process of claim 16 wherein the amount of carboxylic acid anhydride is at least about 5% by weight of the protein dispersion.
Claim 30
Dependent Claim
25 words
The process of claim 27 wherein the amount of carboxylic acid anhydride is between about 7.5 and 10% by weight of the alkaline protein dispersion.
Claim 31
Dependent Claim
26 words
The process of claim 16 including the step of adjusting the pH of the reacted dispersion to the isoelectric point to precipitate the modified protein material.
Claim 32
Dependent Claim
15 words
The process of claim 29 including the step of dewatering the precipitated, modified protein material.
Claim 33
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 34
Dependent Claim
9 words
The product produced by the process of claim 16.
Claim 35
Dependent Claim
97 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a substantially unhydrolyzed vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material; c. hydrolyzing said dispersion for not more than 30 minutes; and d. reacting said treated and hydrolyzed dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
Claim 36
Dependent Claim
97 words
A process for the production of a modified vegetable protein adhesive binder comprising: a. forming an alkaline dispersion of a substantially unhydrolyzed vegetable protein material having reactive disulfide bonds; b. treating said dispersion with a reducing agent in an amount sufficient to react with the disulfide bonds of said protein material; c. hydrolyzing said dispersion for not more than 30 minutes; and d. reacting said treated and hydrolyzed dispersion with a carboxylic acid anhydride in an amount sufficient to modify the protein material wherein the pH is maintained between 9 and 10.5 during said reaction and treatment.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |