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Improved coating composition

A composition, coating technology, applied in the direction of coating, latex paint, etc.

Inactive Publication Date: 2011-04-20
阿克佐 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Painters are now faced with the problem of merging or "mixing" fresh paint with partially dried, more viscous paint so that the surface appears flat, especially in overlapping areas
Still, there remains an unmet need for high-gloss, low-VOC waterborne coatings that dry quickly and have sufficient hardness, especially in the field of architectural coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment P

[0076] Example Pol1

[0077] Fit a 21' flat bottom flask with a stirrer, nitrogen purge, water condenser and appropriate ports for metered addition. A water feed of 550.90 g demineralized water was added to the flask, followed by 27.91 g seed surfactant solution (consisting of 5.39 g Rhodafac RS710, 21.57 g demineralized water and 0.95 g ammonia solution). The temperature of the contents was raised to 80°C using a water bath. When the contents reached 80°C, 13.96 g of a seed monomer mixture (consisting of 4.47 g styrene, 4.38 g methyl methacrylate, 4.61 g butyl acrylate and 0.50 g methacrylic acid) was added to the flask. The temperature was maintained at 80° C. for ten minutes while 19.62 g of seed initiator solution (consisting of 0.82 g sodium persulfate dissolved in 18.80 g demineralized water) was added. After 10 minutes, the temperature was raised to 85°C over 15 minutes. When the set temperature was reached, 544.39 g of the feed monomer mixture (composed of 174.20 g ...

Embodiment

[0084] Example St MMA BA MAA POM Mw

[0085] Pol2 40 19.8 34.3 5.8 0.1 122000

[0086] Pol3 39.8 19.7 34.2 5.8 0.5 53000

[0087] Pol4 39.6 19.6 34.2 5.8 1.0 31000

[0088] St = styrene MMA = methyl methacrylate BA = butyl acrylate MAA =

[0089] Methacrylic acid POM = n-octyl mercaptan

[0090] The weight average molecular weight was measured according to the method described below.

[0091] Examples Pol 2-4 all have a Tg of 30°C and an average particle size of 100 to 120 nm.

[0092] Example Pol5-7

[0093] Effect of Tg

[0094] These examples were carried out in the same manner and with the same ingredients as in Example Pol 1, except that the monomer mixture used was as described below in weight percent.

[0095] Example St MMA BA MAA Tg

[0096] Pol5 35.0 15.7 45.7 3.6 10°C

[0097] Pol6 35.0 22.0 39.4 3.6 20℃

[0098] Pol7 35.0 33.0 28.4 3.6 40°C

[0099] Examples Pol 5-7 all have a Mw of 149,000 to 195,000 Daltons and an average particle size of 100 to 120 na...

Embodiment Pol8 and 9

[0101] Effect of average particle size

[0102] By varying the ratio of surfactant and seed monomer to feed monomer, the particle size of the polymer dispersion can be varied. A different surfactant was used, Rhodafac RK500 instead of Rhodafac RS710 used in Pol1.

[0103] Both variants have the following monomer compositions calculated on a weight percent basis;

[0104] St MMA BA MAA

[0105] 35.0 27.6 33.8 3.6

[0106] Tg is 30°C.

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Abstract

A pigmented, aqueous coating composition comprising i) an aqueous dispersion of non-crosslinkable addition oligomer of weight average molecular weight of from 5000 to 15000 Daltons and calculated Fox Tg greater than 0 DEG C and less than 50 DEG C; ii) an aqueous dispersion of addition polymer of weight average molecular weight greater than 53,000 Daltons, calculated Fox Tg greater than 10 DEG C and less than 40 DEG C and mean particle diameter of less than 150 nanometers, where the ratio of i):ii) is from 0.25:1 to 2.70:1, based on % weight dispersion solids.

Description

technical field [0001] The present invention relates to aqueous coating compositions having low volatile organic solvent content (VOC). In particular, the present invention relates to pigmented aqueous architectural coating compositions which have a high gloss and which retain this gloss when dry. As used herein, the term "architectural coating" is used to refer to coatings that coat the interior and exterior surfaces of structures such as buildings, fences and bridges. In short, such coatings are collectively referred to as paints. The present invention also relates to certain aqueous oligomer and aqueous polymer dispersions. Background technique [0002] Typically, coating compositions include a carrier liquid and a film-forming base polymer as well as other components such as additives, including thickeners; and, for colored coatings, of course pigments. The carrier liquid may comprise water, an organic solvent, or a mixture of water and an organic solvent. In the car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/02
CPCC09D133/08C09D5/02C08L2205/02C08L2666/04
Inventor P·L·泰勒D·M·H·博维S·B·唐宁K·埃尔代伊-布鲁克斯
Owner 阿克佐