US3684759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of modified emulsion polymers with oligourethane salt
Assignee: Bayer AG
•
Filing: 1970-10-21
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Granted: 1972-08-15
•
Expires: 1990-10-21
Abstract
Abstract A process is provided for the preparation of aqueous dispersions of polymers of olefinically unsaturated monomers in the presence of emulsifiers capable of forming free radicals which emulsifiers contain urethane groups, characterized in that 5 TO 95 PERCENT BY WEIGHT OF AT LEAST ONE POLYMERIZABLE OLEFINICALLY UNSATURATED MONOMER IS POLYMERIZED IN THE PRESENCE OF 5 TO 95 PERCENT BY WEIGHT OF ONE OR MORE OLIGOURETHANE SALTS HAVING AN AVERAGE MOLECULAR WEIGHT OF 1,500 TO 20,000 (PREFERABLY 2,000 TO 10,000) AND A TENSILE STRENGTH OF LESS THAN 20 KG WT/CM2, WHICH SALTS HAVE BEEN PREPARED FROM WATERINSOLUBLE OLIGOHYDROXY COMPOUNDS HAVING A MOLECULAR WEIGHT OF 400 TO 5,000.
Inventors
- 👤 Helmut Reiff
- 👤 Dieter Dieterich
- 👤 Frank Wingler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:08
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F283/00; C08F283/006; C08F36/00; C08F36/02; C08F36/04; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the oligourethane salt is in the form of an aqueous sol.
Claim 2
Dependent Claim
23 words
The process of claim 2 wherein the aqueous sol has a solids content of from about 2 to about 55 percent by weight.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the oligourethane salt has a tensile strength of less than about 5 kg wt/cm2.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the oligourethane salt is a cationic compound containing at least one
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein the oligourethane salt is an anionic compound containing at least one -COO( ), -SO3( ), -O-SO3( ), -SO2( ) radical in which R is alkyl, cycloalkyl, aralkyl or aryl.
Claim 6
Dependent Claim
35 words
The process of claim 1 wherein 10 - 25 percent of the monomers are emulsified in an aqueous sol of the oligourethane and the remainder of the monomers is added after polymerization has been initiated.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein a stable emulsion of the monomers in an oligourethane sol is added to the polymerization mixture.
Claim 8
Dependent Claim
33 words
The process of claim 1 wherein water is added and stirred into a mixture of the oligourethane salt and one or more olefinic monomers to form a dispersion and polymerization is then initiated.
Claim 9
Dependent Claim
48 words
The process of claim 1 wherein the oligourethane salt is prepared by reacting water insoluble compounds which contain terminal hydroxyl groups and which have a molecular weight of from about 400 to about 5,000 with an organic polyisocyanate at a temperature of from about 20*C to about 160*C.
Claim 10
Dependent Claim
23 words
The process of claim 10 wherein the NCO/OH ratio is from about 0.4 to about 0.9 or from about 1.1 to about 2.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the oligourethane has a viscosity of less than about 1,500 poises at about 120*C.
Claim 12
Dependent Claim
20 words
The process of claim 1 wherein the monomer is polymerized at a temperature of from about 0* to about 140*C.
Claim 13
Dependent Claim
35 words
The process of claim 1 wherein the polymerization is carried out in the presence of from about 0.05 to about 3 percent by weight based on the weight of the olefin of a polymerization initiator.
Claim 14
Dependent Claim
21 words
The process of claim 1 wherein the polymerization is carried out at a pH of from about 2 to about 9.
Claim 15
Dependent Claim
73 words
A stable aqueous dispersion prepared by the process of claim 1 containing 5 to 95 percent by weight of oligourethane salts having an average molecular weight of 1500 to 20,000 and a tensile strength of less than 20 kg wt/cm2, which salts have been prepared from water insoluble oligohydroxy compounds having a molecular weight of 400 to 5,000, and 5 to 95 percent by weight of at least one polymerizable olefinically unsaturated monomer.
Claim 16
Dependent Claim
21 words
The stable aqueous dispersion of claim 16 having a solids content of from about 20 to about 60 percent by weight.
References Cited (Backward Citations)
US3249654A
Cited
US3388087A
Cited
US3479310A
Cited
US3427192A
Cited
US3491050A
Cited
US3491051A
Cited
US3539483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |