US4704420A
Expired / Lapsed
US
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Highly functional fluorinated polyisocyanates and varnishes obtained therefrom
Assignee: Montedison SpA
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Filing: 1986-12-05
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Granted: 1987-11-03
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Expires: 2006-12-05
Abstract
Abstract Highly functional fluorinated polyisocyanates of the formula: <IMAGE> (I) wherein Z1 represents the functional group -O-CO-NH-R-NCO; Z2 represents the difunctional group -O-CO-NH-R-NH-CO-O-; Rf is a radical derived from fluoropolyethers having a molecular weight between 500 and 7000; T represents a trivalent or tetravalent radical derived from a polyol; q is zero or 1; and s is 1 or 2. Also, varnishes containing said highly functional fluorinated polyisocyanates of formula (I).
Inventors
- 👤 Franco Federici
- 👤 Giorgio Pin
- 👤 Ennio Cozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5015; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
A highly functional fluorinated polyisocyanate of formula: ##STR7## wherein Z 1 represents the functional group --O--CO--NH--R--NCO; Z 2 represents the difunctional group --O--CO--NH--R--NH--CO--O--, R being an alkylene, cycloalkylene, alkylene-cycloalkylene or arylene radical containing from 1 to 20 carbon atoms; R f represents a difunctional radical dervied from a fluoropolyether having an average molecular weight between 500 and 7000, and preferably between 1000 and 2500; T represents a trivalent or tetravalent radical derived from a polyol, preferably having a low molecular weight; q is zero or 1; and s is 1 or 2.
Claim 2
Dependent Claim
92 words
A highly functional fluorinated polyisocyanate of formula: ##STR7## wherein Z 1 represents the functional group --O--CO--NH--R--NCO; Z 2 represents the difunctional group --O--CO--NH--R--NH--CO--O--, R being an alkylene, cycloalkylene, alkylene-cycloalkylene or arylene radical containing from 1 to 20 carbon atoms; R f represents a difunctional radical dervied from a fluoropolyether having an average molecular weight between 500 and 7000, and preferably between 1000 and 2500; T represents a trivalent or tetravalent radical derived from a polyol, preferably having a low molecular weight; q is zero or 1; and s is 1 or 2.
Claim 3
Dependent Claim
107 words
A fluorinated polyisocyanate according to claim 1, wherein the R f radical is selected from among those having the formula: ##STR8## with R 1 selected from: --(CH 2 ) x --, --(CH 2 O) y CH 2 --, --(CH 2 ) x OCH 2 --; x, y are integers between 1 and 4; m, n are integers having the ratio m/n between 0.2 and 2, are preferably between 0.5, R' f is a perfluoro alkylene radical; X is F or CF 3 ; and k, j, w, u, d, b, r, c, v, z, a, g are integers which allow one to obtain the above-said molecular weights.
Claim 4
Dependent Claim
28 words
A fluorinated polyisocyanate according to claim 1 or 2, wherein T represents a trivalent or tetravalent radical derived from a polyol having a molecular weight lower than 400.
Claim 5
Dependent Claim
24 words
A fluorinated polyisocyanate according to claim 1 or 2, wherein the polyol is selected from trimethylolpropane, trimethylolethane, glycerin, 1,2,6-hexanetriol, and ethoxylated or propoxylated pentaerythritol.
Claim 6
Dependent Claim
16 words
A fluorinated polyisocyanate according to claim 1 or 2, wherein the diisocyanate is an aliphatic diisocyanate.
Claim 7
Dependent Claim
12 words
A fluorinated polyisocyanate according to claim 5, wherein the diisocyanate is isoforondiisocyanate.
Claim 8
Dependent Claim
25 words
A fluorinated polyisocyanate according to claim 1 or 2, wherein T represents a trivalent radical derived from polyols having a molecular weight lower than 400.
Claim 9
Dependent Claim
27 words
A fluorinated polyisocyanate according to claim 7, wherein the NCO content based on the dry substance is between 1.5 and 8%, and preferably between 3 and 6%.
Claim 10
Dependent Claim
16 words
A varnish containing a highly functional fluorinated polyisocyanate of formula (I) as shown in claim 1.
Claim 11
Dependent Claim
31 words
A varnish according to claim 9, wherein the polyisocyanate is dissolved in a solvent selected from dimethylformamide, a chlorinated solvent and an organic solvent containing in the molecule an ester-ether group.
Claim 12
Dependent Claim
16 words
A varnish according to claim 9, having present a fluorinated filler up to 50% by weight.
Claim 13
Dependent Claim
16 words
A varnish according to claim 11, wherein the fluorinated filler is chosen from polytetrafluorethylene and polyfluoroethylenepropylene.
Claim 14
Dependent Claim
47 words
A varnish according to claim 12, having the following characteristics after drying: a contact angle between 100° and 110°; a coefficient of friction between 0.1 and 03; an adherence equal to zero; a Sward hardness between 40 and 70; and a salt resistance higher than 1000 hours.
Claim 15
Dependent Claim
80 words
A process for the preparation of a fluorinated polyisocyanate according to claim 1, comprising: (a) reacting a diisocyanate of the formula: OCH--R--NCO at a temperature between 40° and 100° C. with a perfluorinated diol of the formula: HO--R.sub.f --OH wherein R and R f are as defined in claim 1; (b) reacting the thus-obtained reaction product with a polyol or mixture of polyols, preferably having low molecular weight, having functionality 3 or 4, at temperatures between 40° and 100° C.
Claim 16
Dependent Claim
86 words
A process for the preparation of a fluorinated polyisocyanate according to claim 1, which comprises: (i) reacting the entire amount of a polyetherperfluorinated diol with one portion of diisocyanate, in such a manner as to have a molar ratio diisocyanate/diol equal to 2/1; (ii) adding to the thus-obtained product the remaining amount of polyol in such a manner that the molar ratio between the polyol and the reaction product is 2/1; and (iii) adding, after the completion of the reaction, the remaining portion of the diisocyanate.
References Cited (Backward Citations)
US3657320A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
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