Aqueous coating compositions
First Claim
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1. Pigment-containing aqueous coating composition which provides a pigmented coating having a pigment volume concentration (PVC) in the range of from 15 to 35% and an elasticity value of at least 30%;
- wherein said aqueous coating composition comprises;
a seeded multistage polymer latex(es) (A) blended with a non-film forming polymer latex(es) (B), the amount of (A) in the blend corresponding to 75 to 98 weight % of the multistage polymer(s) of (A) based on total weight of the polymers of (A) and (B), and the amount of (B) in the blend corresponding to 2 to 25 weight % of the polymer(s) of (B) based on the total weight of the polymers of (A) and (B);
and wherein with regard to the seeded multistage polymer latex(es) (A);
(a) the multistage polymer(s) thereof comprises 50 to 90 wt % of at least one soft polymer phase having a Tg ≦
25°
C. and 10 to 50 wt % of at least one hard polymer phase having a Tg ≧
30°
C.;
(b) the multistage polymer latex(es) has been prepared in the presence of a seed polymer latex(es), the amount of said seed polymer latex(es) corresponding to 1 to 20 wt % of the seed polymer(s) of the latex(es) based on the weight of the multistage polymer(s); and
(c) the seed polymer(s) having a Tg which is at least 10°
C. lower than the Tg of said hard polymer phase(s) of the multistage polymer(s).
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Abstract
Pigmented aqueous coating composition providing good blocking and elasticity properties comprises a blend of a seeded multistage polymer latex(es) having at least one soft and at least one hard polymer phases and a non-film-forming polymer latex(es), the seed polymer(s) having a Tg≧10° C. lower than that of the hard polymer phase(s) and preferably having a Tg≧10° C. higher than that of the soft polymer phase(s), and the multistage polymer(s) preferably having amino functionality incorporated by an imination reaction.
49 Citations
37 Claims
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1. Pigment-containing aqueous coating composition which provides a pigmented coating having a pigment volume concentration (PVC) in the range of from 15 to 35% and an elasticity value of at least 30%;
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wherein said aqueous coating composition comprises; a seeded multistage polymer latex(es) (A) blended with a non-film forming polymer latex(es) (B), the amount of (A) in the blend corresponding to 75 to 98 weight % of the multistage polymer(s) of (A) based on total weight of the polymers of (A) and (B), and the amount of (B) in the blend corresponding to 2 to 25 weight % of the polymer(s) of (B) based on the total weight of the polymers of (A) and (B); and wherein with regard to the seeded multistage polymer latex(es) (A); (a) the multistage polymer(s) thereof comprises 50 to 90 wt % of at least one soft polymer phase having a Tg ≦
25°
C. and 10 to 50 wt % of at least one hard polymer phase having a Tg ≧
30°
C.;(b) the multistage polymer latex(es) has been prepared in the presence of a seed polymer latex(es), the amount of said seed polymer latex(es) corresponding to 1 to 20 wt % of the seed polymer(s) of the latex(es) based on the weight of the multistage polymer(s); and (c) the seed polymer(s) having a Tg which is at least 10°
C. lower than the Tg of said hard polymer phase(s) of the multistage polymer(s).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 33, 34, 35, 36, 37)
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29. Method for making a pigment-containing aqueous coating composition which method comprises:
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(1) forming a seeded multistage polymer latex(es) (A) by conducting a multistage polymer emulsion polymerisation(s) in the presence of a seed polymer latex(es), wherein; (i) the multistage polymer(s) of (A) comprises 50 to 90 wt % of at least one soft polymer phase having a Tg of ≦
25°
C., and 10 to 50 wt % of at least one hard polymer phase having a Tg of ≧
30
C.;(ii) the seed polymer(s) of (A) has a Tg which is at least 10°
C. lower than the Tg of said at least one hard polymer phase of the multistage polymer;(iii) the multistage polymer latex(es) is formed in the presence of 1 to 20 wt % of the seed polymer(s) based on the weight of the multistage polymer(s); (2) blending said seeded multistage polymer latex(es) (A) with a non-film-forming polymer latex(es) (B), the amount of (A) in the blend corresponding to 75 to 98% by weight of the polymers of (A) based on the total weight of the polymers of (A) and (B), and the amount of (B) in the blend corresponding to 2 to 25% by weight of polymer of (B) based on the total weight of the polymers of (A) and (B); (3) formulating said seeded multistage polymer latex(es) (A) and said non-film-forming polymer latex(es) (B) blended therewith, with a particulate pigment in an amount to provide a pigment volume concentration (PVC) in a pigmented coating formed from the coating composition within the range of from 15 to 35%; and
wherein further pigmented coatings formed from the coating composition have an elasticity value of at least 30%. - View Dependent Claims (30, 31, 32)
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Specification