Shell Oil Comapny

Mitsubishi Petrochemical Company Limited

Yojiro Yamamoto

Yoshikazu Kobayashi

Riichiro Maruta

Kiyoaki Okayama

Takaya Shinmura

Takako Watanabe

Present invention relates to a process for preparing a high molecular weight epoxy resin which has a weight average molecular weight value more than 40,000 and an epoxy equivalent weight less than 10,000 g/eq. This high molecular weight epoxy is prepared by a reaction of a divalent epoxy resin with a bisphenol compound in the presence of a catalyst and a solvent characterized in utilizing 1.10 to 1.03/1 of molar ratio of epoxy group/phenolic hydroxyl group.

Process for preparation of high molecular weight epoxy resin

Providing a modified epoxy resin which is suitable for utilized as a coating for repairing, a process for the preparation thereof, and a composition. It is a modified epoxy resin obtained by reacting at least one epoxy resin (a) having at least one or more epoxy groups in a molecule with at least one kind of aliphatic monocarboxylic acid (b) having carbon atoms of 10 to 30 in a molecule in proportion of 20 to 80% by equivalent with respect to the epoxy groups in said epoxy resin, a process for the preparation of said resin by the use of a phosphorus-based catalyst, and a composition comprising said resin and a solvent.

Modified epoxy resin modified epoxy resin composition and a process for

An epoxy resin composition for powder coatings which comprises (a) 40 to 95 parts by weight of a solid epoxy resin having at least two epoxy groups in a molecule, an epoxy equivalent of 400 to 2500, and a softening point of 50.degree. C. to 150.degree. C., and (b) 5 to 60 parts by weight of an epoxidized polydiene polymer having a main structure of general Formula (I) in which aliphatic double bonds are partially epoxidized. Formula (I) is

Powder coating of epoxy resin and epoxidized polydiene block polymer

A novel resin composition which is composed of molecules having an epi-bis type main skeleton of the formula ##STR1## X.sub.1 -X.sub.4 : H, Cl or Br R: H, or CH.sub.3 and has a Gardner-Holdt viscosity of C to Z.sub.8 determined at 25.degree. C. for a solution in butyl carbitol in a concentration of 40% by weight. At least 40% of the entire terminal groups of the molecules of the novel composition consists of .alpha.-glycol groups of the formula ##STR2## wherein R represents hydrogen or methyl. The composition is more rapidly curable at lower temperatures than known epoxy resins having an epi-bis type main chain skeleton, and is useful as a paint or adhesive and also as an adhesion improver for other resins.

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Yokkaichi, Japan

Yojiro Yamamoto