US 2003/0191236 A1 · Polymeric aqueous coating compositions

Abstract

An aqueous coating composition comprising a crosslinkable water-dispersible oligomer(s), a dispersed polymer(s) and optionally a non-crosslinkable water-dispersible oligomer wherein the crosslinkable oligomer(s) and non-crosslinkable oligomer(s) comply with Equation 1 as follows: 1 - 15 × 10 4 < L = Mw × PDi 0.8 A × ( 1 + Q ) 0.5 + { ( Mw × PDi 0.8 ) / A } 0.5 × V - Y - Z < 40 × 10 4

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Claims25

Dependent claims

3 - 15 × 10 4 < L = Mw × PDi 0.8 A × ( 1 + Q ) 0.5 + { ( Mw × PDi 0.8 ) / A } 0.5 × V - Y - Z < 40 × 10 4
wherein:
L for the oligomer being calculated is a dimensionless number;
all values are used as values without their dimensions, except for the values used in the sine functions which are defined below;
Mw=weight average molecular weight;
PDi=polydispersity index;
Q=(meq COOH/100 g)/15+(meq OH/100 g)/200+[(meq{urethane*+urea*}/100 g)/75]+[(meq{urethane**+urea**}/100 g)/220]+(meq rings/100 g)/90+(meq amide/100 g)/85+(meq nitrile/100 g)/100, where meq COOH/100 g represents the milliequivalents of carboxylic acid groups present per 100 g of solid oligomer(s) that is being calculated and mutatis mutandis for OH groups, rings (i.e. aromatic, cycloaliphatic or heterocyclic rings) urethane, urea, amide and nitrile, it being understood that not all such groups need to be present, in which case the meq. would be zero and where *=not derived from tetramethyl-1,3-xylenediisocyanate and where **=derived from tetramethyl-1,3-xylenediisocyanate;
A={([9+3.16×Σni=1{wt. % solvent i×0.1/[evaporation rate solvent i]0.6}]/20)+0.025×(plasticiser wt. %+reactive diluent wt. %)}, where the wt. % of solvent, plasticiser and reactive diluent present in the total composition in each case are based on the weight of crosslinkable and non-crosslinkable oligomer(s) in the composition;
n=total number of solvents, and
if no solvent is present A=0.45, and
where for all solvents with an evaporation rate less then 0.03 the value for the evaporation rate is to be taken as 0.03,
Y=30000×sine{(polyoxyethylene residue wt. %)×3.6} where {(polyoxyethylene residue wt. %)×3.6} is expressed in the unit degrees, and where the wt. % of polyethyleneoxide residue is based on the weight of the oligomer [that is being calculated];
Z=fatty acid group residue wt. %×2,000 where the wt. % of fatty acid group residue is based on the weight of the oligomer [that is being calculated];
V=(P+{P/(P+0.1)}×75,000)×{Mw/[100×(Mw+20,000)]}, and P=({sine[((methyl residue wt. %+(0.2×(styrene residue wt. %+alphamethylstyrene residue wt. %)))×6)−45]+1}4×200,000×R), where [((methyl residue wt. %+(0.2×(styrene residue wt. %+alphamethylstyrene residue wt. %)))×6)−45] is expressed in the unit degrees and the wt. % of methyl , styrene and alphamethylstyrene residues are based on the weight of vinyl oligomer [that is being calculated] excluding fatty acid groups, and R=2.7 and if less then 4wt % vinyl oligomer is present based on the weight of binder material then R=zero;

11 more elements

Dependencies are inferred from the claim text.

Description24,082 words

Summary19,514 words

#The present invention relates to certain aqueous ambient temperature crosslinkable and shelf stable polymer compositions which, inter alia, provide coatings having an improved open time and wet edge time as well as a good tack-free time.

#A general need when applying a decorative or protective coating to a substrate is to be able to repair irregularities in the still-wet coating after some time has elapsed, for example by re-brushing over a freshly coated wet substrate, or by applying more of the coating composition over a previously coated substrate either over the main area of the coating or an edge of the coating or even blending a drop into the coating without vitiating the complete merging of any boundaries in the vicinity of the repaired irregularity. Traditionally compositions containing binder polymers dissolved in organic solvents are used and the organic solvents are employed to modify the drying characteristics of the coated composition. For example, organic solvent based alkyds with an open time of 30 to 45 minutes are available in the decorative “Do-it-Yourself” DIY market. However the disadvantage of organic solvent based coatings is the toxic and flammable nature of such solvents and the pollution and odour caused on evaporation as well as the relatively high cost of organic solvents.

#Thus with the continuing concern about the use of organic solvent based coatings there has been a long felt need for an aqueous coating composition with comparable properties to those achievable using organic solvent based compositions.

Detailed description4,568 words

#Pigmented paint composition comprising dispersion A1P1.

#A 1-L 3-necked round bottom flask, equipped with a stirrer, was loaded with dispersion A1P1 (312.18 g) and a TiO2-based pigment paste (106.00 g; solids content of 74.9%) in a nitrogen atmosphere, and the mixture was stirred for 30 minutes at ambient temperature. The resulting paint had a solids content of 40.76%. Example 1 was formulated with 0.4% Byk 344 on binder solids (in all other cases 0.2% was used).

#Examples 2, 4, 5, 7, 8 and 9, and comparative examples C3 and C6 were prepared according to similar procedures using the components presented in Table 5.

Polymeric aqueous coating compositions

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Polymeric aqueous coating compositions

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Life of this patent

Abstract

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Claims25

Description24,082 words

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Description24,082 words