Coated particle
AssigneeAjinomoto Co., Inc.
InventorEriko Sato
Life of this patent
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Abstract
Provided is a urea compound-containing epoxy resin curing agent particle that can impart excellent storage stability and heat stability to an epoxy resin composition including a urea compound as a curing agent, while maintaining the solubility of the urea compound during heating and the fluidity after dissolution of the urea compound. The surface of the urea compound-containing epoxy resin curing agent particle is coated with a Group 4 or Group 13 element-containing alkoxide compound, chelate compound, and/or acylate compound.
Claims17
A coated particle comprising a urea compound-containing epoxy resin curing agent particle (A) and a Group 4 or Group 13 element-containing compound (B) coating a surface of the particle, wherein the Group 4 or Group 13 element-containing compound is at least one selected from the group consisting of an alkoxide compound, a chelate compound, and an acylate compound, wherein the Group 4 or Group 13 element-containing compound (B) includes
- (a) a compound represented by formula (1):
- D(OR1)n
- wherein in formula (1),
- D is a Group 4 or Group 13 element,
- when D is a Group 4 element, n is 4,
- when D is a Group 13 element, n is 3, and
- in each of n OR1s, R1 is independently,
- (i) a linear or branched saturated or unsaturated C1-20 hydrocarbon group,
- (ii) an acyl group represented by formula (1a):
- COR2, wherein in formula (1a), R2 is a linear or branched saturated or unsaturated C1-20 hydrocarbon group, or
- (iii) a group represented by formula (1b):
- R3C(O)R4, wherein in formula (1b), R3 is a linear or branched saturated or unsaturated C1-4 hydrocarbon group, and R4 is R5 or OR5, where R5 is a linear or branched saturated or unsaturated C1-20 hydrocarbon group;
- and OR1 is coordinate-bonded to D through a carbonyl group in the formula (1b) to form the following cyclic structure (1c):
- wherein in formula (1c), the dotted line indicates a coordinate bond,
- (b) a compound represented by formula (2):
- wherein in formula (2), D, n, and R1 are the same as those defined in formula (1), and R6 is a linear or branched saturated or unsaturated C1-20 hydrocarbon group;
- or
- (c) a 2- to 10-mer of a compound represented by the formula (1) and/or a compound represented by the formula (2).
A method for coating an epoxy resin curing agent particle, the method comprising a step of coating a surface of a urea compound-containing epoxy resin curing agent particle (A) with at least one selected from the group consisting of Group 4 or Group 13 element-containing alkoxide, chelate, and acylate compounds (B), wherein the Group 4 or Group 13 element-containing compound (B) includes
- (a) a compound represented by formula (1):
- D(OR1)n
- wherein in formula (1),
- D is a Group 4 or Group 13 element,
- when D is a Group 4 element, n is 4,
- when D is a Group 13 element, n is 3, and
- in each of n OR1s, R1 is independently,
- (i) a linear or branched saturated or unsaturated C1-20 hydrocarbon group,
- (ii) an acyl group represented by formula (1a):
- COR2, wherein in formula (1a), R2 is a linear or branched saturated or unsaturated C1-20 hydrocarbon group, or
- (iii) a group represented by formula (1b):
- R3C(O)R4, wherein in formula (1b), R3 is a linear or branched saturated or unsaturated C1-4 hydrocarbon group, and R4 is R5 or OR5, where R5 is a linear branched saturated or unsaturated C1-20 hydrocarbon group:
- and OR1 is coordinate-bonded to D through a carbonyl group in the formula (1b) to form the following cyclic structure (1c):
- wherein in formula (1c), the dotted line indicates a coordinate bond,
- (b) a compound represented by formula (2):
- wherein in formula (2), D, n, and R1 are the same as those defined in formula (1), and R6 is a linear or branched saturated or unsaturated C1-20 hydrocarbon group;
- or
- (c) a 2- to 10-mer of a compound represented by the formula (1) and/or a compound represented by the formula (2).
Dependencies are inferred from the claim text.