Latent hardener

Inactive Publication Date: 2007-01-11
DEXERIALS CORP
View PDF4 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The latent curing agent of the present invention, which consists of an aluminum chelating agent and a porous resin carrier for the aluminum chelating agent, the carrier being obtained through interfacial polymerization of a polyfunctional isocyanate compound, can cure thermosetting epoxy resins at a relatively low temperature and in a relatively short period of time. In addition, curing conditions for the latent curing agent can be cont

Problems solved by technology

As a result, the microcapsules obtained tend to have non-uniform and rough surfaces, and the resulting curing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Latent hardener
  • Latent hardener
  • Latent hardener

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] 800 parts by weight of distilled water, 0.05 parts by weight of a surfactant (Newrex, available from NOF Co., Ltd.), and 4 parts by weight of polyvinyl alcohol (PVA-205, available from KURARAY Co., Ltd.) to serve as a dispersing agent were placed in a three-liter thermometer-equipped vessel intended for interfacial polymerization, and the mixture was thoroughly mixed. Meanwhile, 11 parts by weight of a 24% isopropanol solution of aluminum monoacetylacetonate bis(ethylacetoacetate) (Alumichelate D, available from KAWAKEN FINE CHEMICALS Co., Ltd.) and 11 parts by weight of a methylenediphenyl-4,4′-diisocyanate (3 mol) / trimethylolpropane (1 mol) adduct (D-109, available from MITSUI TAKEDA CHEMICALS Inc.) were dissolved in 30 parts by weight of ethyl acetate to form an organic phase solution. This solution was added to the above-prepared mixture and the resulting mixture was emulsified by a homogenizer (at 11000 rpm for 10 min). Then, the interfacial polymerization was allowed to...

example 2

[0076] The same procedure was followed as in Example 1, except that toluene diisocyanate (3 mol) / methylenediphenyl-4,4′-diisocyanate (3 mol) / trimethylolpropane (1 mol) adduct (D-103M-2, MITSUI TAKEDA CHEMICALS Inc.) was used in place of methylenediphenyl-4,4′-diisocyanate (3 mol) / trimethylolpropane (1 mol) adduct, to obtain 20 parts by weight of a spherical latent curing agent sized approximately 10 μm.

example 3

[0077] The same procedure was followed as in Example 1, except that toluene diisocyanate (3 mol) / trimethylolpropane (1 mol) adduct (D-103, available from MITSUI TAKEDA CHEMICALS Inc.) was used in place of methylenediphenyl-4,4′-diisocyanate (3 mol) / trimethylolpropane (1 mol) adduct, to obtain 20 parts by weight of a spherical latent curing agent sized approximately 10 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Weightaaaaaaaaaa
Viscosityaaaaaaaaaa
Thermosettingaaaaaaaaaa
Login to view more

Abstract

A latent curing agent that can cure a thermosetting epoxy resin in a relatively short period of time and at a relatively low temperature has a structure in which an aluminum chelating agent is held by a porous resin carrier obtained through interfacial polymerization of a polyfunctional isocyanate compound. The aluminum chelating agent is preferably a complex compound comprising β-ketoenolate anion ligands coordinated to aluminum. The latent curing agent can be produced by dissolving the aluminum chelating agent and the polyfunctional isocyanate compound in a volatile organic solvent, adding the resulting solution to an aqueous phase containing a dispersing agent, and stirring the resulting mixture to cause interfacial polymerization of the isocyanate compound while the mixture is being heated.

Description

TECHNICAL FIELD [0001] The present invention relates to a latent curing agent that can initiate curing of thermosetting epoxy resin compositions at relatively low temperature. The present invention also relates to a method for producing such a latent curing agent, as well as to a thermosetting epoxy resin composition that contains the latent curing agent and is thus highly stable during storage. BACKGROUND ART [0002] Thermosetting epoxy resin compositions are widely used as adhesives and molding materials. Among different curing agents used to cure thermosetting epoxy resin compositions are imidazole latent curing agents. These imidazole latent curing agents do not cure under normal storage conditions and are thus widely used to make thermosetting epoxy resin compositions into one-pack type curable compositions that are easy to handle and are stable during storage. One example of such imidazole latent curing agents includes an agent provided in the form of microcapsules in which par...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08L63/00C08K3/10C08G18/08C08G18/58C08G18/79C08G59/18C08G59/70H05K3/32
CPCC08G18/79C08G59/70H05K3/323C08G18/0852C08G18/58C08G59/188C08G59/00C08G59/18
Inventor KAMIYA, KAZUNOBUYOSHINARI, MAKOTO
Owner DEXERIALS CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap