Powdery adhesive and process for preparation thereof
First Claim
1. A powdery adhesive comprised of spherical particles comprising 40 to 90 parts by weight of an epoxy resin component and 10 to 60 parts by weight of a rubber component, said spherical particles containing up to about 15 parts by weight of a latent curing agent for the epoxy resin component per 100 parts of the total weight of the epoxy resin component and the rubber component, wherein the average particle size of the particles is from 0.1 to 500 μ
- m.
1 Assignment
0 Petitions
Accused Products
Abstract
A powdery adhesive comprised of spherical particles comprising 40 to 90 parts by weight of an epoxy resin component, 10 to 60 parts by weight of a rubber component and a latent curing agent contained inside the particles, the average particle size of the particles being from 0.1 to 500 μm. The powdery adhesive may be prepared by a process comprising a step of preparing a compatible mixture comprising an epoxy resin component, a rubber component and a common organic solvent, a step of emulsifying or suspending the compatible mixture in an aqueous medium to form spherical particles, and a step of causing a phase separation of the epoxy resin component and the rubber component in the spherical particles.
19 Citations
23 Claims
- 1. A powdery adhesive comprised of spherical particles comprising 40 to 90 parts by weight of an epoxy resin component and 10 to 60 parts by weight of a rubber component, said spherical particles containing up to about 15 parts by weight of a latent curing agent for the epoxy resin component per 100 parts of the total weight of the epoxy resin component and the rubber component, wherein the average particle size of the particles is from 0.1 to 500 μ
-
11. A process for the preparation of a powdery adhesive, which comprises a step of preparing a compatible mixture comprising an epoxy resin component, a rubber component and a common organic solvent for said epoxy resin and rubber components, wherein said epoxy resin component 40 to 90 parts by weight and said rubber components comprises 10 to 60 parts by weight, said mixture contains up to about 15 parts by weight of a latent curing agent for the epoxy resin component per 100 parts of the total weight of the epoxy resin component and the rubber component;
- a step of emulsifying or suspending the compatible mixture in an aqueous medium, whereby spherical particles composed of said mixture being formed;
a step of removing the organic solvent from the mixture, whereby causing a phase separation of the epoxy resin component and the rubber component in the spherical particles; and
a step of collecting said spherical particles. - View Dependent Claims (12, 13, 14, 15, 16)
- a step of emulsifying or suspending the compatible mixture in an aqueous medium, whereby spherical particles composed of said mixture being formed;
- 17. A process for the preparation of a powdery adhesive, which comprises a step of preparing a compatible mixture comprising an epoxy resin component, a rubber component and a common organic solvent for said epoxy resin and rubber components, wherein said epoxy resin component comprises 40 to 90 parts by weight and said rubber component comprises 10 to 60 parts by weight, a step of emulsifying or suspending the compatible mixture in an aqueous medium, whereby spherical particles composed of said mixture being formed, a step of removing the organic solvent from the mixture, whereby causing a phase separation of the epoxy resin component and the rubber component in the spherical particles, a step of adding an amine type curing agent to the emulsion or suspension, whereby partially curing the epoxy resin component in the spherical particles so that at least surface of the spherical particles loses stickiness, and a step of collecting said spherical particles.
Specification