EP0405534A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
The use of fluorinated polyurethanes with hydroxy functionality for the treatment of lithoidal material
Assignee: Syremont SpA
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Filing: 1990-06-27
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Granted: —
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Expires: 2010-06-27
Abstract
Abstract Described are fluorinated polyurethanes with hydroxy functionality, obtainable by reacting at least one diisocyanate with at least one hydroxy-capped (per)fluoropolyether, preferably having a molecular weight of from about 400 to about 7000 and with at least one polyol having a functionality of at least 2. These products are useful for the treatment of lithoidal materials.
Inventors
- 👤 Ennio Cozzi
- 👤 Franco Federici
- 👤 Paolo Parrini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:01
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/48; C04B41/4838; C04B41/4842; C04B41/4846; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5015
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
Fluorinated polyurethanes with hydroxy functionality, obtainable by reacting at least one organic diisocyanate with at least one hydroxy-capped (per)fluoropolyether and further reacting the resulting product with a polyol having a functionality of at least 2, and wherein the ratio of equivalents of isocyanate groups to total hydroxy groups is not higher than 1.
Claim 2
Dependent Claim
53 words
Fluorinated polyurethanes with hydroxy functionality, obtainable by reacting at least one organic diisocyanate with at least one hydroxy-capped (per)fluoropolyether and further reacting the resulting product with a polyol having a functionality of at least 2, and wherein the ratio of equivalents of isocyanate groups to total hydroxy groups is not higher than 1.
Claim 3
Dependent Claim
20 words
Polyurethanes according to claim 1, wherein the ratio of NCO equivalents to total OH equivalents ranges from 0.001 to 1.
Claim 4
Dependent Claim
41 words
Polyurethanes according to any one of claims 1 and 2, wherein the diisocyanate is selected from compounds of general formula I: OCN-R₁-NCO (I) wherein R₁ is a alkylene, cycloalkylene, alkylene-cycloalkylene or arylene group and contains from 1 to 20 carbon atoms.
Claim 5
Dependent Claim
126 words
Polyurethanes according to any one of the preceding claims, wherein the hydroxy-capped (per)fluoropolyethers are fluoropolyoxyalkylene ethers having an average molecular weight of from about 400 to about 7000 and have the general formula II: HO-R f -OH (II) wherein R f is selected from wherein: R is selected from -(CH₂) x -; -[(CH₂O) y CH₂]-, and -(CH₂) x -OCH₂-, with x and y being integers of from 1 to 4; m and n are integers with a ratio m/n of from 0.2 to 2, preferably from 0.5 to 1.2; R′ f is a perfluoroalkylene radical; X is F or CF₃; k, j, w, u, d, b, r, c, v, z, a and g are integers such that the resulting molecular weights are within the indicated range.
Claim 6
Dependent Claim
55 words
Polyurethanes according to any one of the preceding claims, having an average molecular weight of at least about 1000, preferably from about 2000 to about 5000, a hydroxy functionality of at least 2, preferably from 2 to 6,and a fluorine content of at least 30% by weight, preferably of from 35 to 50% by weight.
Claim 7
Dependent Claim
96 words
Process for preparing fluorinated polyurethanes with hydroxy functionality according to anyone of the preceding claims, comprising: (a) reacting the diisocyanate and the hydroxy-capped (per)fluoropolyether at a temperature of from about 40 to about 100°C, the ratio of NCO equivalents to OH equivalents being about 2; (b) reacting the product of step (a) with the polyol having a functionality of at least 2 at a temperature of from about 40 to about 100°C, the ratio of NCO equivalents employed in step (a) to OH equivalents being not higher than 0.5, and preferably ranging from 0.25 to 0.5.
Claim 8
Dependent Claim
37 words
Process according to claim 6, wherein step (b) is followed by at least one further double reaction in which the treatment with diisocyanate and then with polyol is carried out under the conditions given in claim 6.
Claim 9
Dependent Claim
36 words
Process according to any one of claims 6 and 7 wherein the reactions of steps (a) and (b) and the optional successive steps are carried out in a solvent which is inert under the reaction conditions.
Claim 10
Dependent Claim
22 words
Use of the polyurethanes according to any one of claims 1 to 5 as protective agents in the treatment of lithoidal materials.
Claim 11
Dependent Claim
29 words
Use according to claim 9, wherein the polyurethanes are used in dissolved form at a concentration of from 1 to 20% by weight, preferably 1 to 5% by weight.
References Cited (Backward Citations)
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