US4495226A
Expired / Lapsed
US
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Method for preparing silicone-treated starch
Assignee: Dow Silicones Corp
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Filing: 1983-12-05
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Granted: 1985-01-22
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Expires: 2003-12-05
Abstract
Abstract A method for treating starch with organosiloxane polymers is described in which the organosiloxane polymer is contacted with starch in an aqueous dispersion at a temperature of from 60° C. to 98° C. for a period of at least 60 seconds. Starch treated by this method can be useful as glue, a binder, a filler, or a coating. Starch treated with aminoalkyl- or epoxyalkyl- substituted polydimethylsiloxane is especially useful as a water repellent sizing for substrates such as paper and textiles.
Inventors
- 👤 Jari K. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:06
CPC Classifications
C; C08; C08G; C08G81/00; C08B; C08B31/00; C08L; C08L3/00; C08L3/02; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
141 words
A method for treating starch, said method comprising contacting said starch with from about 0.1% to about 15% by weight, based on the weight of the starch, of an organosiloxane polymer, said organosiloxane polymer consisting essentially of three or more siloxane units having the formula R a SiO.sub.(4-a)/2, said siloxane units being joined to one another by siloxane bonds, wherein a has a value of 0, 1, 2 or 3 and R is a silicon-bonded radical selected from the group consisting of hydrocarbon radicals, hydrocarbonoxy radicals, substituted hydrocarbon radicals, substituted hydrocarbonoxy radicals, and the hydroxyl radical, with the proviso that any hydroxyl radicals are present only on terminal R a SiO.sub.(4-a)/2 units, said contacting being done in water, at a temperature of from about 60° C. to about 98° C. for a period of time at least 60 seconds in duration.
Claim 2
Independent Claim
141 words
A method for treating starch, said method comprising contacting said starch with from about 0.1% to about 15% by weight, based on the weight of the starch, of an organosiloxane polymer, said organosiloxane polymer consisting essentially of three or more siloxane units having the formula R a SiO.sub.(4-a)/2, said siloxane units being joined to one another by siloxane bonds, wherein a has a value of 0, 1, 2 or 3 and R is a silicon-bonded radical selected from the group consisting of hydrocarbon radicals, hydrocarbonoxy radicals, substituted hydrocarbon radicals, substituted hydrocarbonoxy radicals, and the hydroxyl radical, with the proviso that any hydroxyl radicals are present only on terminal R a SiO.sub.(4-a)/2 units, said contacting being done in water, at a temperature of from about 60° C. to about 98° C. for a period of time at least 60 seconds in duration.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said contacting is done by adding the organosiloxane polymer to an aqueous dispersion of the starch.
Claim 4
Dependent Claim
38 words
The method of claim 2 wherein said aqueous dispersion of the starch is at a temperature of from about 60° C. to about 98° C. when the organosiloxane polymer is added to the aqueous dispersion of the starch.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said contacting is done by adding the starch to an aqueous dispersion of the organosiloxane polymer.
Claim 6
Dependent Claim
87 words
The method of claim 1, 2, 3, or 4 wherein the organosiloxane polymer is a polydiorganosiloxane having the formula MeR' 2 SiO(Me 2 SiO) y (MeR"SiO) z SiMeR' 2 , wherein Me is the --CH 3 radical, R' is selected from the group consisting of the --CH 3 radical, the --OCH 3 radical, and the --OH radical, R" is an aminoalkyl radical, y has an average value of from about 10 to about 600 and z has an average value of from about 1 to about 25.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein the aminoalkyl radical is --CH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 .
Claim 8
Dependent Claim
86 words
The method of claim 1, 2, 3, or 4 wherein the organosiloxane polymer is a polydiorganosiloxane having the formula MeR' 2 SiO(Me 2 SiO) y (MeR"SiO) z SiMeR' 2 wherein Me is the --CH 3 radical, R' is selected for the group consisting of the --CH 3 radical, the --OCH 3 radical, and the --OH radical, R" is an epoxyalkyl radical, y has an average value of from about 10 to about 600, and z has an average value of from about 1 to about 25.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the epoxyalkyl radical is ##STR12##
Claim 10
Dependent Claim
93 words
A process for sizing a substrate, said process comprising: (A) applying an aqueous dispersion of treated starch to said substrate, said aqueous dispersion of treated starch having been prepared by contacting said starch with from about 0.1% to about 15%, by weight, based on the weight of the starch, of an organosiloxane polymer, said contacting being done at a temperature of from about 60° C. to about 98° C., for a period of time at least 60 seconds in duration, and (B) subsequently causing the water to evaporate from the applied aqueous dispersion.
Claim 11
Dependent Claim
93 words
A process for sizing a substrate, said process comprising: (A) applying an aqueous dispersion of treated starch to said substrate, said aqueous dispersion of treated starch having been prepared by contacting said starch with from about 0.1% to about 15%, by weight, based on the weight of the starch, of an organosiloxane polymer, said contacting being done at a temperature of from about 60° C. to about 98° C., for a period of time at least 60 seconds in duration, and (B) subsequently causing the water to evaporate from the applied aqueous dispersion.
Claim 12
Dependent Claim
22 words
The process of claim 9 wherein said contacting is done by adding the organosiloxane polymer to an aqueous dispersion of the starch.
Claim 13
Dependent Claim
38 words
The process of claim 10 wherein said aqueous dispersion of the starch is at a temperature of from about 60° C. to about 98° C. when the organosiloxane polymer is added to said aqueous dispersion of the starch.
Claim 14
Dependent Claim
22 words
The process of claim 9 wherein said contacting is done by adding the starch to an aqueous dispersion of the organosiloxane polymer.
Claim 15
Dependent Claim
86 words
The process of claim 9, 10, 11, or 12 wherein the organosiloxane polymer is a polydiorganosiloxane having the formula MeR' 2 SiO(Me 2 SiO) y (MeR"SiO) z SiMeR' 2 whereing Me is the --CH 3 radical, R' is selected from the group consisting of the --CH 3 radical, the --OCH 3 radical, and the --OH radical, R" is an aminoalkyl radical, y has an average value of from about 10 to about 600, and z has an average value of from about 1 to about 25.
Claim 16
Dependent Claim
23 words
The process of claim 13 wherein the aminoalkyl radical is --CH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 .
Claim 17
Dependent Claim
86 words
The process of claim 9, 10, 11, or 12 wherein the organosiloxane polymer is a polydiorganosiloxane having the formula MeR' 2 SiO(Me 2 SiO) y (MeR"SiO) z SiMeR' 2 whereing Me is the --CH 3 radical, R' is selected from the group consisting of the --CH 3 radical, the --OCH 3 radical, and the --OH radical, R" is an epoxyalkyl radical, y has an average value of from about 10 to about 600, and z has an average value of from about 1 to about 25.
Claim 18
Dependent Claim
11 words
The process of claim 15 wherein the epoxyalkyl radical is ##STR13##
Claim 19
Dependent Claim
10 words
The process of claim 9 wherein the substrate is paper.
Claim 20
Dependent Claim
10 words
The process of claim 11 wherein the substrate is paper.
Claim 21
Dependent Claim
10 words
The process of claim 14 wherein the substrate is paper.
Claim 22
Dependent Claim
10 words
The process of claim 16 wherein the substrate is paper.
Claim 23
Dependent Claim
8 words
Starch treated by the method of claim 1.
Claim 24
Dependent Claim
9 words
A substrate sized by the process of claim 9.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |