Aqueous coating composition
AssigneeNippon Carbide Kogyo Kabushiki Kaisha
InventorsMasami Uemae, Takeshi Komatsu, Yoshihiro Maeyama, Takashi Yamakoshi, Akira Kume
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Abstract
An aqueous coating composition comprising fine polymer particles dispersed in an aqueous medium and an inorganic filler, wherein said fine polymer particles comprise synthetic rubber emulsion polymer particles having a glass transition temperature of 0.degree. C. or less and emulsion polymer particles having a glass transition temperature of 20.degree. C. or more, and further, according to circumstances, urethane emulsion polymer particles. This composition has various properties as a chipping-resistant coating agent in good balance and is particularly useful for coating of the outdoor sheet metal working members of wheeled vehicles.
Claims44
An aqueous coating composition comprising two different fine polymer particles (A) and (B) dispersed in an aqueous medium and in an inorganic filler, wherein said fine polymer particles comprise particles
- (A) 50 to 95 weight % of synthetic rubber emulsion polymer particles containing 30 to 90 weight % of a conjugated diolefin unit and having a glass transition temperature of -10.degree. C. or less, and
- (B) 5 to 50 weight % of emulsion polymer particles containing 30 to 99.9 weight % of the unit represented by the formula ##STR6## wherein, R.sup.1 represents a hydrogen atom or methyl group, and Q represents COOR.sup.2, ##STR7## or --CN wherein R.sup.2 represents a lower alkyl group and R.sup.3 represents a hydrogen atom or lower alkyl group, and having a glass transition temperature of at least 20.degree. C.
An aqueous coating composition comprising two different fine polymer particles (A) and (B) dispersed in an aqueous medium and in an inorganic filler, wherein said fine polymer particles comprise particles
- (A) 50 to 95 weight % of synthetic rubber emulsion polymer particles containing 30 to 90 weight % of a conjugated diolefin unit and having a glass transition temperature of -20.degree. to -80.degree. C., wherein said synthetic rubber emulsion polymer particles (A) are those obtained by aqueous emulsion polymerizing under pressure
- (a-1) a conjugated diolefinic monomer with
- (a-2) an aromatic vinyl monomer, a vinyl cyanide monomer or a mixture thereof, and
- (B) 5 to 50 weight % of emulsion polymer particles containing 30 to 99.9 weight % of the unit represented by the formula ##STR11## wherein said emulsion polymer particles (B) are those prepared by emulsion polymerizing
- (b-1) an ethylenic monomer which is represented by the formula ##STR12## wherein R.sup.1 represents a hydrogen atom or methyl group, and Q represents COOR.sup.2, ##STR13## or --CN wherein R.sup.2 represents a lower alkyl group and R.sup.3 represents a hydrogen atom or a lower alkyl group, whose homopolymer is hydrophobic and has a Tg of 30.degree. C. or more with
- (b-2) a carboxyl group-containing ethylenic monomer.
An aqueous coating composition comprising two different fine polymer particles (A) and (B) dispersed in an aqueous medium and in an inorganic filler, wherein said fine polymer particles comprise particles
- (A) 50 to 95 weight % of synthetic rubber emulsion polymer particles containing 30 to 90 weight % of a conjugated diolefin unit and having a glass transition temperature of -20.degree. to -80.degree. C., wherein said synthetic rubber emulsion polymer particles (A) are those obtained by aqueous emulsion polymerizing under pressure
- (a-1) a conjugated diolefinic monomer, and
- (a-2) an aromatic vinyl monomer, a vinyl cyanide monomer, or a mixture thereof, together with
- (a-3) a carboxyl group-containing ethylenic monomer, and
- (B) 5 to 50 weight % of emulsion polymer particles containing 30 to 99.9 weight % of the unit represented by the formula ##STR14## wherein said emulsion polymer particles (B) are those prepared by emulsion polymerizing
- (b-1) an ethylenic monomer which is represented by the formula ##STR15## wherein R.sup.1 represents a hydrogen atom or methyl group, and Q represents COOR.sup.2, ##STR16## or --CN wherein R.sup.2 represents a lower alkyl group and R.sup.3 represents a hydrogen atom or a lower alkyl group, whose homopolymer is hydrophobic and has a Tg of 30.degree. C. or more and
- (b-2) a carboxyl group-containing ethylenic monomer, together with
- (b-3) a hydroxyl group-containing ethylenic monomer.
Dependencies are inferred from the claim text.