AQUEOUS COMPOSITIONS HAVING POLYALKOXYLATES FOR IMPROVED OPEN TIME

Abstract

The present invention provides aqueous compositions that provide improved open time, the compositions comprising (i) an aqueous polymer composition of one or more emulsion polymers, one or more aqueous dispersion polymers, or mixtures thereof, preferably, a vinyl or acrylic emulsion polymer, and (ii) from 0.1 to 5 wt. %, based on the total weight of solids in the composition, one or more polyalkoxylates having from 2 to 15 polyalkoxylate chains and an ethylene oxide (EO) content ranging from 20 to 70 wt. %, based on the total weight of polyalkoxylate solids in the composition. The compositions are useful in high solids or fast drying compositions such as coatings and non-cementitious mortars.

Claims

1. An aqueous composition comprising (i) an aqueous polymer composition of one or more emulsion polymers, one or more aqueous dispersion polymers, or mixtures thereof, and (ii) from 0.1 to 5 wt. %, based on the total weight of solids in the composition, one or more polyalkoxylates having from 2 to 15 polyalkoxylate chains and an ethylene oxide (EO) content ranging from 20 to 70 wt. %, based on the total weight of polyalkoxylate solids in the composition.

2. The aqueous composition as claimed in claim 1, wherein the (i) aqueous polymer composition is one or more vinyl or acrylic emulsion polymer.

3. The aqueous composition as claimed in claim 2, wherein at least one of the (i) one or more vinyl or acrylic emulsion polymers has a measured (DSC) glass transition temperature (measured Tg) of from −100 to 20° C.

4. The aqueous composition as claimed in claim 1, wherein the (ii) one or more polyalkoxylates has the formula I-[AO.sub.nH].sub.f, wherein I is an organic active hydrogen containing compound; wherein AO is an alkylene oxide that comprises ethylene oxide (EO) or EO combined with propylene oxide (PO) and/or butylene oxide (BO) in a random order or in an oligomer having blocks, preferably, having at least one block of EO; wherein n is the total number of AO groups and may range from 1 to 50.

5. The aqueous composition as claimed in claim 4, wherein in the formula I-[AO.sub.nH].sub.f, f ranges from 3 to 10.

6. The aqueous composition as claimed in claim 1, wherein at least one of the (ii) one or more polyalkoxylates has a normal boiling point at 100 kPa of from 280° C. to 450° C.

7. The aqueous composition as claimed in claim 1, wherein the (ii) one or more polyalkoxylates is a polyalkoxylate of an active hydrogen compound chosen from polyols having 3 or more hydroxyl groups, difunctional aminoalcohols, diamines, triamines, polyamines, and phenolic resins having 3 to 8 hydroxyl groups.

8. The aqueous composition as claimed in claim 7, wherein the (ii) one or more polyalkoxylates is a polyalkoxylate of diethanol amine, glycerol, pentaerythritol, a sugar alcohol, a diamine or a triamine.

9. The aqueous composition as claimed in claim 1, wherein the compositions further comprise one or more coalescents with a normal boiling point of from 280° C. to 450° C.

10. The aqueous composition as claimed in claim 1, further comprising one or more fillers, extenders and/or pigments comprises, a pigment combined with one or more fillers and/or extenders.

Description

EXAMPLES

[0090] The following examples illustrate the present invention.

[0091] Abbreviations used in the Examples include: BA=butyl acrylate; MMA=methyl methacrylate; MAA=methacrylic acid; nDDM=n-dodecyl methacrylate; EHA=ethylhexyl acrylate; STY=styrene; BMA=butyl methacrylate; MPG=monopropylene glycol; DETA=diethylene triamine; DAnMDPA=3,3′ diamino-N methyl dipropyl amine

[0092] Also used in the Examples are:

[0093] Acrylic emulsion polymer A (50 wt. % solids, one stage, BA/MMA emulsion polymer, Tg (DSC)<5° C.);

[0094] Acrylic emulsion polymer B (50 wt. % solids, single stage, acid functional BA/MMA emulsion polymer, Tg (DSC) ˜25° C.);

[0095] Acrylic acid copolymer dispersant (Tamol™ 165A, 21.50 wt. % solids, Dow);

[0096] Dioctyl sulfosuccinate surfactant (Triton™ GR-7M, Dow, 100 wt. % solids);

[0097] Mineral oil/silica defoamer (Drewplus™ L-475, Ashland Chemical, Houston, Tex., 100 wt. % solids);

[0098] Glycol ether ester coalescent DPnB Adipate (Dipropylene glycol butyl adipate 100 wt. % solids); and,

[0099] Triethylene glycol bis-2-ethylhexanoate (Optifilm™ 400 coalescent, Eastman Chemicals).

[0100] Additives for open time of the invention are characterized in Table 1. below:

TABLE-US-00001 TABLE 1 Poly (alkoxylates) additives of the invention Active EO Example Hydrogen I Functionality, f wt % Mn 1 Glycerine 3 32 4500 2 Diol (MPG 2 40 2500 monopropylene glycol) 3 Di-Ethylene 5 25 5000 Triamine 4 DAnMDPA 4 15 6800 (amine) 5 Alkyl Phenol 6-8 23 3700 Formaldehyde resin

[0101] The additives in Table 1, above, were added at 2 wt. %, based on the weight of the total formulation shown in Table 2, below, into the letdown, to make an aqueous paint composition.

TABLE-US-00002 TABLE 2 Coating composition 22% PVC and a volume solids of 36% Wt. Material Name parts Grind Rutile TiO.sub.2 slurry (76.5 wt. % solids in water, Ti-Pure ™ 1584.45 R-746, Chemours, Wilmington, DE) Polyacrylic acid dispersant (25 wt. % in water, Tamol ™ 731A, 33.97 Dow) Polyether siloxane surfactant (BYK 348, Byk Additives, Inc., 4.53 Louisville, KY) Polyether siloxane defoamer (Tego Foamex ™ 810. Evonik 2.26 Industries, Parsippany, NJ) Grind Sub-total 1625.22 Premix Water 94.67 Acrylic emulsion polymer A 2374.41 Ammonia (28%) 3.17 BYK 348 surfactant 4.53 Tego Foamex ™ 810 defoamer 2.26 Acrysol ™ RM-2020 NPR Hydrphobically modified ethoxylated 138.15 urethane (HEUR) rheology modifier (Dow) Acrysol ™ RM-8W (HEUR rheology modifier, Dow) 19.48 Water 549.44 Premix Sub-total 3186.11 Totals 4811.33 Property Value Total % PVC 21.95 Volume Solids 36.44

[0102] The formulations were tested, as follows:

[0103] Open time: The indicated composition in a container was drawn down on Leneta chart (B#4425 paper, Leneta company, Inc., Mahwah, N.J.) with a 125 micron (5 mil) square bar that is 10 cm (4″) wide. Immediately after the drawdown was complete, a timer was started at 0 minutes. With a tongue depressor, two (2) parallel lines were drawn from the edge of the chart and running ⅓ of the length of the chart. A brush (2.54 cm nylon brush, Wooster model 4176, Wooster Brush Company, Wooster, Ohio) was dipped in the composition and brushed out on scrap paper. The container with the indicated composition was placed on a scale. Then, starting at the 1 minute time mark and repeating every min. thereafter, the brush was loaded so that from 1 to 2 cm (½ in.-¾ in.) of the bristles of the brush were dipped into the composition in the container so as to hold the desired amount of 0.6-0.7 gms of the composition on the brush, as determined by weighing the container on the scale. The loaded brush was placed down on the left side of the drawdown and brushed in a back and forth manner across the two scribed lines of the painted Leneta chart. Each stroke was counted as 1 (back and forth=2). In each minute, this was repeated until 20 strokes were completed; the brushing time was 30 seconds within each minute. This was continued every minute until “failure” was observed visually. Failure means the scribed lines did not disappear after brushing. The time for such failure was recorded as the open time of the composition. An average from a total of three trials of this experiment was taken for each Example indicated and the results were recorded as the open time of the composition in Table 3, below.

TABLE-US-00003 TABLE 3 Open Time Additive Performance: Example Open time (mins) 1 12 2 16 3 13 4 7 5 7 6* (No 4 additive) *Denotes Comparative Example

[0104] As shown in Table 3, above, aqueous coating compositions with the open time additives of the present invention dramatically improved the open time of the aqueous compositions. The open time was especially improved when using polyalkoxylates of glycerol, propylene glycol and polyamines as in Examples 1, 2 and 3.

[0105] The additives in Table 5, below, were added to the letdown in the amounts indicated in Table 4, below, based on the total solids weight of the formulation, to make an aqueous paint composition.

TABLE-US-00004 TABLE 4 Coating composition 23% PVC and a volume solids of 35% wt. parts [[not Material Name pounds]] Grind Rutile TiO.sub.2 slurry (76.5 wt. % solids in water, Ti-Pure ™ 341.31 R-746, Chemours, Wilmington, DE) Water 58.06 Acrylic acid copolymer dispersant 8.70 Dioctyl sulfosuccinate surfactant 2.11 Grind Sub-total 410.18 LetDown Mineral oil/silica defoamer 2.01 Acrylic emulsion polymer B 494.80 Coalescent or Additive blend (see Table 5, below) 19.79 water 106.01 Acrysol ™ RM-2020 NPR Hydrophobically modified 20.05 ethoxylated urethane (HEUR) rheology modifier (Dow) Acrysol ™ RM-8W (HEUR rheology modifier, Dow) 5.31 LetDown Sub-total 647.97 Totals 1058.15

TABLE-US-00005 TABLE 5 Effect of Coalescent on Open Time Open time Example Composition (mins)  7* Acrylic emulsion polymer B —  8* triethylene glycol bis-2-ethylhexanoate (1.8 wt. 7-8 %)  9 triethylene glycol bis-2-ethylhexanoate (1.8 wt. 18-19 %) + 1.13 wt. % Open time Additive of Example 2  10* DPnB Adipate (1.8 wt. %)  9 11 DPnB Adipate (1.8 wt. %) + 0.68 wt. % Open 11-12 time Additive of Example 2 12 DPnB Adipate (1.8 wt. %) + 1.13 wt. % Open 15-16 time Additive of Example 2 13 DPnB Adipate (1.8 wt. %) + 1.35 wt. % Open 16-17 time Additive of Example 2 14 DPnB Adipate (1.8 wt. %) + 1.13 wt. % Open 12 time Additive of Example 2 premixed before addition

[0106] As shown in Table 5, above, the aqueous compositions of the present invention improve open time relative to compositions just containing a coalescent, as in Comparative Examples 8 and 10. The open time is improved more where more of the open time additive is used. Compare Examples 11, 12 and 13 to Comparative Example 10.