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Patent US4863986A successfully refreshed from Google Patents.
US4863986A
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Fluorinated polyisocyanates suitable as paint components
Assignee: Montedison SpA
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Filing: 1988-06-10
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Granted: 1989-09-05
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Expires: 2008-06-10
Abstract
Abstract Fluorinated polyisocyanates particularly suitable for the formulation of coating paints and compositions in the electronics industry, obtained by starting from a perfluoropolyether polyol having a functionality higher than 2 and from a diisocyanate, the resulting derivative having isocyanic functions being further condensed with a polyol in order to obtain a polyisocyanate with a high degree of functionality, and containing from 1.5% to 9% by weight of --NCO groups.
Inventors
- 👤 Alberto Re
- 👤 Marco De Giorgi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:29
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: 10
Claim 1
Independent Claim
199 words
High-functionality fluorinated polyisocyanates of formula: ##STR21## where: R 1 is a divalent, trivalent or tetravalent radical of the alkylene, cycloalkylene, fluoroalkylene or polyoxyalkylene type having a moleculr weight from 200 to 4000, or a radical having a polyester structure and a molecular weight from 200 to 4000; R 2 is an alkylene, cycloalkylene, alkylcycloalkylene, arylene, alkyl-arylene divalent radical containing from 2 to 20 carbon atoms; R f is a divalent radical having a perfluoropolyether structure and an average molecular weight from 400 to 7000, consisting of a sequence of oxyperfluoroalkylene units selected from: --CF 2 O, --CF 2 CF 2 O--, --CF 2 CF 2 CF 2 O--, ##STR22## T and T', like or unlike each other, represent a linking group between the perfluoropolyether chain and the monovalent Z groups and may be a divalent radical of the alkylene or the oxyalkylene type and at least one of them is a trivalent radical; Z is a monovalent radical containing an isocyanate group having the structure --OCONHR 2 ; and a and a' are 1 or 2 each, their sum being higher than 2, and furthermore characterized in that they contain from 1.5% to 9% by weight of --NCO groups.
Claim 2
Dependent Claim
199 words
High-functionality fluorinated polyisocyanates of formula: ##STR21## where: R 1 is a divalent, trivalent or tetravalent radical of the alkylene, cycloalkylene, fluoroalkylene or polyoxyalkylene type having a moleculr weight from 200 to 4000, or a radical having a polyester structure and a molecular weight from 200 to 4000; R 2 is an alkylene, cycloalkylene, alkylcycloalkylene, arylene, alkyl-arylene divalent radical containing from 2 to 20 carbon atoms; R f is a divalent radical having a perfluoropolyether structure and an average molecular weight from 400 to 7000, consisting of a sequence of oxyperfluoroalkylene units selected from: --CF 2 O, --CF 2 CF 2 O--, --CF 2 CF 2 CF 2 O--, ##STR22## T and T', like or unlike each other, represent a linking group between the perfluoropolyether chain and the monovalent Z groups and may be a divalent radical of the alkylene or the oxyalkylene type and at least one of them is a trivalent radical; Z is a monovalent radical containing an isocyanate group having the structure --OCONHR 2 ; and a and a' are 1 or 2 each, their sum being higher than 2, and furthermore characterized in that they contain from 1.5% to 9% by weight of --NCO groups.
Claim 3
Dependent Claim
58 words
The fluorinated polyisocyanates of claim 1, wherein T, T' are selected from: (a) straight alkylene divalent radicals having 1 to 4 C; (b) oxyalkylene divalent radicals of the type: --CH 2 O(CH 2 CH 2 O) y CH 2 CH 2 -- where y=0 to 4; and (c) trivalent radicals containing at least an ether or amidic bond.
Claim 4
Dependent Claim
16 words
The fluorinated polyisocyanates of claim 1, wherein R 2 is a divalent radical derived from isophoronediisocyanate.
Claim 5
Dependent Claim
21 words
The fluorinated polyisocyanates of claim 1, wherein R 1 is the radical --CH 2 CH 2 CH 2 CH 2 --.
Claim 6
Dependent Claim
14 words
The fluorinated polyisocyanates of claim 1, wherein R 1 is the trivalent radical: ##STR23##
Claim 7
Dependent Claim
81 words
A process for preparing the polyisocyanates of claim 1, which comprises reacting, at a temperature from 40° to 100° C., a perfluoropolyether polyol of the formula: (HO) a T--R f --T'(OH)a' with a diisocyanate CON--R 2 --NCO, thereby obtaining polyisocyanate (Z) a T--R f --T'(Z) a ' wherein Z=--OCONHR 2 , the polyisocyanate so obtained being then condensed by reaction at a temperature ranging from 20° to 100° C. with a polyol R 1 (OH) t , where t=2 to 4.
Claim 8
Dependent Claim
11 words
Paints containing, as a film-forming substance, the polyisocyanate of claim 1.
Claim 9
Dependent Claim
11 words
The paints of claim 7, containing as a solid filler, polyetetrafluoroethylene.
Claim 10
Dependent Claim
32 words
The method of obtaining protective coating layers (conformal coatings) on articles manufactured by the electronics industry comprising applying as a film-forming substance on said articles a polyisocyanate as defined in claim 1.
References Cited (Backward Citations)
US4782130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |