Modified isocyanates
AssigneeRhodia Chimie
InventorJean-Marie Bernard
Life of this patent
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Abstract
Modified stable polyisocyanates are described having at least one isocyanate function modified by a group having cross-linking functionality. The modified stable polyisocyanates may be prepared by reacting at least one polyisocyanate with a compound of the formula: 1
Claims22
Modified isocyanates of formula I below:
- 12
- in which:
- Iso is a (poly)isocyanate residue (after having disregarded an isocyanate function);
- X represents an atom or a group of atoms resulting from the reaction of a compound bearing a —X′H group, where X′ represents X or —OCOX, optionally after decarboxylation when X′ represents OCOX with the isocyanate function;
- A represents a bond or a linear, branched or cyclic hydrocarbon-based chain containing from 1 to 30, advantageously from 1 to 18 and preferably 1 to 5 carbon atoms;
- R1 represents H or a C1-C6 alkyl group;
- Q is absent or represents an oxygen or sulfur atom or a hydrocarbon-based chain as defined for A;
- Z represents a bond or a hydrocarbon-based chain as defined for A;
- Y represents a bond or a hydrocarbon-based chain as defined for A;
- W is absent or represents an oxygen or sulfur atom or a hydrocarbon-based chain as defined for A;
- and
- Q being obviously absent when Y or A represents a bond and W or A being obviously absent when Y or Z represents a bond;
- with the proviso that Z and Y do not simultaneously represent a bond.
Modified isocyanates according to one of the preceding claims, characterized in that Y represents a —CH2— group.
Modified isocyanates according to any one of the preceding claims, in which Z represents a bond or —CH2—, preferably a bond.
Modified isocyanates according to any one of the preceding claims, in which W and Q represent a bond.
Modified isocyanates according to any one of the preceding claims, characterized in that they also comprise at least one other free isocyanate function and/or at least one other isocyanate function masked with a masking agent or a mixture of thermolabile masking agents.
Modified isocyanates according to any one of the preceding claims, characterized in that they are selected from:
- diisocyanates;
- isocyanate compounds, in particular polyisocyanates comprising an isocyanurate group, which are also known as trimers;
- isocyanate derivatives, in particular polyisocyanates comprising at least one uretidinedione group, which are also known as dimers;
- isocyanate derivatives, in particular polyisocyanates comprising at least one biuret group;
- isocyanate derivatives, in particular polyisocyanates comprising at least one carbamate groups;
- isocyanate d rivatives, in particular polyisocyanates comprising at least one allophanate group;
- isocyanate derivatives, in particular polyisocyanates comprising at least one ester group;
- isocyanate derivatives, in particular polyisocyanates comprising at least one amide group;
- isocyanate derivatives, in particular polyisocyanates comprising at least one urea function;
- isocyanate derivatives, in particular polyisocyanates comprising at least one iminocyclooxadiazinedione function;
- isocyanate derivatives, in particular polyisocyanates comprising at least one cyclooxadiazinetrione function;
- isocyanate derivatives, in particular polyisocyanates comprising at least one masked isocyanate group;
- isocyanate derivatives, in particular polyisocyanates comprising a combination of one or more of the groups which have just been mentioned, in particular an isocyanurate group.
Modified isocyanates according to any one of the preceding claims, characterized in that they are obtained from hexamethylene diisocyanate.
Modified isocyanates according to any one of the preceding claims, characterized in that they consist of diisocyanate derivatives comprising at least some of the isocyanate functions, preferably at least 100% to 1% and advantageously loot to 30%, by weight, modified with a crosslinking group of formula II as defined in claim 25, and at least 1%, advantageously at least 5% and preferably at least 10, and up to 99%, advantageously up to 70% by weight, of isocyanate functions modified with at least one masking group.
Dependencies are inferred from the claim text.