Polyurethane
AssigneeCroda International PLC
InventorsAngela Leonarda Maria Smits, Wilhelmus Adrianus Jacobus Honcoop, Remco Benjamin Van Triet
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Abstract
The present invention relates to a self-healing polyurethane, a polyol for use in the polyurethane, and to the use of the polyol and/or polyurethane in coatings, elastomers, composites, adhesives and/or sealants. The polyurethane is capable of exhibiting self-healing (for example, intrinsic self-healing) which results in recovery of a proportion of one or more physical parameters. The polyurethane which is capable of self-healing is the reaction product of reactants comprising a polyol, a polyisocyanate; and optionally, a chain extender. The polyol comprises at least one dimer fatty residue; at least one urethane, amide or carbonate group; and at least two hydroxyl end groups.
Claims22
A polyurethane which is capable of self-healing and which is the reaction product of reactants comprising:
- (A) a polyol having a number average molecular weight of 1,000 to 6,000, wherein the polyol comprises:
- (i) at least one dimer fatty residue;
- (ii) at least one urethane group;
- (iii) at least two hydroxyl end groups;
- and
- (iv) optionally, at least one ester group, wherein the polyol has more urethane groups in total than ester groups;
- (B) a polyisocyanate;
- and
- (C) optionally, a chain extender.
A polyurethane obtained by reacting:
- (A) a polyol having a number average molecular weight of 1,000 to 6,000 and which is the reaction product of reactants comprising:
- (i) at least one of a dimer fatty diacid, a dimer fatty diol, or a dimer fatty diisocyanate;
- (ii) at least one of a first polyisocyanate or a lactam;
- and
- (iii) optionally, a non-dimeric diol, a non-dimeric diacid and/or a lactone;
- wherein the polyol is capable of forming at least two hydrogen bonds within the polyurethane and has more urethane groups in total than any ester groups that are optionally present;
- (B) a second polyisocyanate;
- and
- (C) optionally, a chain extender;
- wherein the polyurethane is capable of self-healing.
Dependencies are inferred from the claim text.