Nippon Paint Compnay, Ltd.

Other

Toyota Jidosha Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Shin-etsu Chemical Co., Ltd.

Mitsuo Yamada

Ryuzo Mizuguchi

Kei Aoki

Toshiyuki Ishii

Hiroyuki Nojiri

Shinsuke Shirakawa

Ichiro Kawakami

Satoshi Urano

Yoshio Kojima

Hirotoshi Umemoto

Hiroharu Ohsugi

Shuhei Yamoto

Makoto Ando

Kazunori Kanda

Hisaki Tanabe

Shinji Nakano

Satoru Uchidoi

Masahiro Takegawa

Yusaku Kobata

Keisuke Tsutsui

Hiromichi Tamasaki

Eiji Nakajima

Keizou Ishii

Mitsuhiro Takarada

Yuji Yoshikawa

Yoshio Eguchi

Kenshiro Tobinaga

Ryoichi Murakami

Ryozo Takagawa

Nobuaki Tomita

Satoshi Kodama

Motoi Tanimoto

Mitsuhiro Abe

Hiromichi Kayano

Koji Ito

Takahiro Mukae

Hirotaka Kanato

Haruhiko Takasaki

Seiji Yokoi

Toshitaka Koyama

Shoki Tsuji

Koji Asakura

The present invention provides a lead-free cationic electrodeposition coating composition which contains an aqueous medium, a binder resin composed of a cationic epoxy resin and a blocked isocyanate curing agent dispersed or dissolved in the aqueous medium, a neutralizing acid in order to neutralize the cationic epoxy resin, an organic solvent, and a metal catalyst, wherein the electrodeposition coating composition has a volatile organic content of 1% by weight or less, a metal ion content of 500 ppm or less, a neutralizing acid amount of 10 to 30 mg equivalent based on 100 g of binder resin solid content. The lead-free cationic electrodeposition coating composition has high throwing power, and exert a little influence on the environment due to its low VOC, low metal ion content, and reduced consumption of a coating composition itself.

Lead-free cationic electrodeposition coating composition, and electrodeposition coating process

With the use of a lead-free cationic electrodeposition coating composition containing a sulfonium-modified epoxy resin, an amine-modified novolak-type epoxy resin, and a blocked isocyanate curing agent as a binder resin, wherein the content of volatile organic components is 1% by weight or less, the coating liquid conductivity is 1000 to 2500 &#x3bc;S/cm, and the minimum film-forming temperature of the coated layer electrodeposited on an object to be coated is 20 to 35&#xb0; C., electrodeposition coating is carried out at or above the temperature which is lower by 2&#xb0; C. than the minimum film-forming temperature and at or below the temperature which is higher by 6&#xb0; C. than the minimum film-forming temperature.

Electrodeposition coating method using lead-free cationic electrodeposition coating composition

The present invention provides a novel oxazolidone ring-containing epoxy resin suitable for use as a resin for a coated film having a structure of the formula: wherein Rrepresents a residue excluding epoxy groups of diepoxide, X represents a residue excluding isocyanate groups of polyurethane diisocyanate, and n represents an integer of 1 to 5; and wherein X has a structure of the formula: wherein Rrepresents a residue excluding isocyanate groups of diisocyanate, Rrepresents a residue excluding hydroxyl groups of diol, and m represents an integer of 2 to 10.

Oxazolidone ring-containing epoxy resin

Disclosed is a three coat one bake coating process for forming an intermediate coated film, a base coated film and a clear coated film on an electrodeposition coated film. The electrodeposition coating composition is a lead-free cationic electrodeposition coating composition which has a volatile organic content of 1% by weight or less, a metal ion content of 500 ppm or less, a neutralizing acid amount of 10 to 30 mg equivalent based on 100 g of binder resin solid content. The intermediate coating composition and/or the base coated composition comprises a specific amount of a nonaqueous dispersion resin as a resin component. In the coating process, a baking step is omitted from the conventional intermediate coating process, or from the conventional base coating process.

Process for forming layered coated film, and layered coated film

Method for producing pigment dispersing resin for cationic electrodeposition paint

Amino-polyether-modified epoxy and cationic electrodeposition paint composition containing the same

A cationic electrodeposition coating composition is provided which contains blocked isocyanate curing agent which is blocked with a substance not recognized as a HAPs (hazardous atmospheric pollutant). The cationic electrodeposition coating composition of the present invention contains a cationic group-containing epoxy modified base resin and a blocked isocyanate curing agent, wherein said blocked isocyanate curing agent is obtained by reacting a polyisocyanate compound with, as a blocking agent, a terminal primary OH-containing propylene glycol monoalkyl ether and expressed by the formula RO(CH(CH )CH O) H (where R is an alkyl group having 1 to 8 carbons, which may be branched, and n is 1 to 3).

Cationic electrodeposition coating composition

A cationic electrodeposition coating composition which contains a plasticizer is provided, which does not cause poor adhesion with intermediate and top coats, and allows the VOC content to be reduced. The cationic electrodeposition coating composition of the present invention is a cationic electrodeposition coating composition which contains a cationic group-containing epoxy modified base resin, a blocked isocyanate curing agent and a plasticizer, wherein the plasticizer is a propylene oxide oligomer with an average molecular weight of 200 to 1500, contains a primary hydroxyl group on the repeating terminals of the propylene oxide, and contains one or two primary hydroxyl groups and/or primary amino groups in the molecule.

Cationic electrodeposition coating composition containing plasticizer

The present invention can provide a cationic electrocoating composition, comprising:

Cationic electrocoating composition

Cathodic electrodeposition paints of the type in which a cationically modified epoxy resin is crosslinked with a blocked polyisocyanate crosslinker are disclosed. The paint contains a cationically modified epoxy resin having at least one oxazolidone ring in the molecule and a Tg ranging between 0.degree. C. and 35.degree. C., and a blocked alicyclic polyisocyanate. The use of lead based anticorrosive pigments may be eliminated or substantially reduced. When the alicyclic polyisocyanate is a bicycloalkane polyisocyanate, the use of organic solvent may also be reduced.

Cathodic electrodeposition paint

A cathodic electrodeposition paint containing a cationically modified epoxy resin and a crosslinker dispersed in an acidic aqueous medium is disclosed. The paint contains as an auxiliary component for improving the surface smoothness of the cured paint films a t-alkylphenol novolac resin-alkylene oxide adduct or a reaction product thereof with a half blocked diisocyanate.

Cathodic electrodeposition paint forming films having improved surface

A diglycidyl ether epoxy resin is reacted with a blocked prepolymer having a soft segment and an asymmetric bisurethane having a first urethane group with a lower alkanol and a second urethane group with a monohydroxyl compound capable of enhancing thermoflowability. The product is then reacted with a cationic active hydrogen compound such as amines to open the remaining epoxy rings. The modified epoxy resin thus produced is dispersed in an aqueous medium containing a neutralizing agent together with a blocked polyisocyanate crosslinker to give a cathodic electrodeposition paint having improved impact strength and thermoflowability.

Epoxy resin modified with alkanol-blocked prepolymer and bisurethane

The present invention relates to compounds containing an oxamic acid group, which show high reactivity and have stability for water and are used as paints, adhesives, and plastic materials etc. in the form of a reaction material or a resin. Since into these compounds an oxamic acid group is introduced in a part of the molecule and the oxamic acid group is an ionic functional group, the compounds show superior solubility and dispersing character in water and also, since the oxamic acid group is a group of a disappearing type with heating, the compounds do not remain, after hardening, in the hardened product. Accordingly, the hardened products obtained from these compounds are superior in water-resistant and anticorrosion properties and in durability.

Compound containing an oxamic acid group, a process for producing the

A pigment grinding resin composition for an electrodeposition paint comprising a cationic pigment grinding resin obtained by reacting a modified epoxy resin with sulfide in the presence of a monobasic acid and a hydroxyl group-containing dibasic acid, wherein said modified epoxy resin is obtained by reacting at least one epoxy resin having an epoxy equivalent of 150 to 2000 selected from the group consisting of bisphenol A, F and S type epoxy resins with a half-blocked diisocyanate, and wherein said sulfide is selected from the group consisting of 1-(2-hydroxyethylthio)-2-propanol, 1-(2-hydroxyethylthio)-2-butanol and 1-(2-hydroxyethylthio)-3-butoxy-1-propanol. By introducing the acid group into the epoxy resin, the dispersibility of the pigment and the compatibility with the main binder, etc., is improved. By using this pigment grinding resin, a pigment paste, as well as an electrodeposition paint can be produced having excellent storage stability and excellent corrosion resistance in respect to films produced therefrom.

Pigment grinding resin composition for electrodeposition paint and

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Suita, Japan

Mitsuo Yamada