Claims
- 1. An aqueous coating composition having wet adhesion properties, which comprises a blend of two different aqueous film-forming copolymer dispersions in which the copolymer particles have different average particle size ranges and consisting essentially of:
- (a) about 1 to about 50 wt % of a first of said two different film-forming copolymer dispersions wherein the copolymer particles have an average particle size of from about 50 to about 200 nm, said copolymer particles of said first film-forming copolymer dispersion comprising the copolymeric product formed by copolymerization of a first copolymerizable mixture of monomers which includes a wet adhesion-imparting quantity of an unsaturated wet adhesion property imparting cyclic ureido monomer, and
- (b) about 99 to about 50 wt % of a second of said two different film-forming copolymer dispersions wherein the copolymer particles have an average particle size of about 300 to about 700 nm, said copolymer particles of said second film-forming copolymer dispersion comprising the copolymeric product formed by copolymerization of a second copolymerizable mixture of monomers from which said unsaturated wet adhesion property imparting cyclic ureido monomer is absent,
- wherein said cyclic ureido monomer is present in said blend, in copolymerized form and only in the first polymer dispersion, in an amount of about 0.01 to about 0.25 wt % of total monomer present in polymerized form in said first and second film-forming copolymer dispersions in said blend.
- 2. A composition as claimed in claim 1 comprising about 1 to about 20 wt % of the first film-forming copolymer and about 99 to about 80 wt % of the second film-forming copolymer.
- 3. A composition as claimed in claim 2 comprising about 5 to about 15 wt % of the first film-forming copolymer and about 95 to 85 wt % of the second film-forming copolymer.
- 4. A composition as claimed in claim 1, wherein said first copolymer comprises:
- (i) a major amount of an acrylic moiety selected from esters of acrylic and methacrylic acid,
- (ii) optionally, a minor amount of an unsaturated carboxylic acid selected from acrylic acid and methacrylic acid, and
- (iii) a wet adhesion-imparting quantity of an unsaturated wet adhesion property imparting cyclic ureido monomer.
- 5. A composition as claimed in claim 1, wherein said first copolymer comprises:
- (i) about 70 to about 95 wt % of vinyl acetate,
- (ii) from 0 to about 1 wt % of an unsaturated carboxylic acid,
- (iii) a wet adhesion-imparting quantity of an unsaturated wet adhesion property imparting cyclic ureido monomer, and
- (iv) the balance by weight of an acrylic moiety selected from esters of acrylic acid.
- 6. A composition as claimed in claim 1, wherein said first copolymer comprises the copolymeric product of:
- (i) about 15 to about 55 wt % of styrene,
- (ii) a wet adhesion imparting quantity of an unsaturated wet adhesion property imparting cyclic ureido monomer, and
- (iii) the balance by weight of at least one acrylic moiety selected from esters of acrylic acid.
- 7. A composition as claimed in claim 1, wherein said second copolymer has a glass transition temperature of about -5.degree. C. to about +25.degree. C. and comprises the copolymer product of at least about 50% of vinyl acetate and at least one monomer selected from the group consisting of ethylene, acrylate esters, vinyl chloride and vinyl versatate.
- 8. A composition as claimed in claim 1, wherein said second copolymer comprises:
- (i) about 70 to about 95 wt % of vinyl acetate,
- (ii) from 0 to about 1 wt % of an unsaturated carboxylic acid, and
- (iii) from 0 to about 2 wt % of sodium vinyl sulfonate, and
- (iv) the balance, by weight, of an acrylic moiety selected from esters of acrylic acid.
- 9. A composition as claimed in claim 1, wherein said second copolymer comprises:
- (i) about 5 to about 25 wt % of ethylene,
- (ii) about 50 to about 80 wt % of vinyl acetate,
- (iii) optionally, about 0.5 to about 2 wt % of unsaturated carboxylic acid, sodium vinyl sulfonate, trialkoxy silane or epoxy trialkoxy silane, and
- (iv) the balance by weight of vinyl chloride.
- 10. A composition as claimed in claim 1, wherein the first copolymer particles have a particle size from about 100 to about 200 nm and the second copolymer particles have a particle size from about 400 to about 600 nm.
- 11. A composition as claimed in claim 1, wherein said cyclic ureido monomer is employed in an amount of about 0.5 to about 3 wt % of the total monomers in said first copolymer particles.
- 12. A composition as claimed in claim 1, wherein said cyclic ureido monomer is present in said composition in an amount from about 0.04 to about 0.1 wt % of total monomers in said blend.
- 13. A composition as claimed in claim 1, wherein said cyclic ureido monomer having the formula: ##STR9##
- 14. A composition as claimed in claim 13, wherein said cyclic ureido monomer has the formula: ##STR10##
- 15. A composition as claimed in claim 1, wherein said first copolymer particles comprise vinyl acetate copolymer particles which contain about 80 to about 95 wt % of vinyl acetate; about 0.5 to about 1 wt % of acrylic acid; a monoalkyl maleate or sodium vinyl sulfonate; and the balance by weight of an acrylic acid ester selected from butyl acrylate and 2-ethyl hexyl acrylate.
- 16. A composition as claimed in claim 1, wherein said vinyl acetate copolymer dispersion contains about 0.4 to about 0.8 wt % of the total monomer in said vinyl acetate copolymers of a polymeric colloidal stabilizer selected from carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl cellulose.
- 17. A composition as claimed in claim 1, wherein said first aqueous copolymer dispersion has a solids content of about 40 to about 70 wt % and said second aqueous copolymer dispersion has a solids content of about 40 to about 70 wt %.
- 18. A latex paint formulation containing the composition of claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
519428 |
Feb 1989 |
CAX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/480,432, filed Feb. 15, 1990, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4104220 |
Sims |
Aug 1978 |
|
4219454 |
Iacoviello et al. |
Aug 1980 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
2045366 |
Jan 1992 |
CAX |
63-193959 |
Aug 1988 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
480432 |
Feb 1990 |
|