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Gradient polymer compositions for elastomeric wall and roof coatings

A water-based composition, the technology of the composition, applied in the direction of coating, etc., can solve the problems of failure to provide roof coatings, disclosure, etc.

Inactive Publication Date: 2016-10-12
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, JP2000-319301A fails to inherently or literally disclose any deep-tone, mid-tone, light-color or black paint composition and fails to provide any method of preparing roof paint with suitable shade retention

Method used

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  • Gradient polymer compositions for elastomeric wall and roof coatings
  • Gradient polymer compositions for elastomeric wall and roof coatings
  • Gradient polymer compositions for elastomeric wall and roof coatings

Examples

Experimental program
Comparison scheme
Effect test

example

[0092] Example: The following examples illustrate the advantages of the invention. All temperature conditions are room temperature (22°C to 24°C) and all pressure units are 1 atmosphere, unless otherwise indicated.

[0093] testing method: The following test methods are used in the examples.

[0094] Mechanical properties: Tensile Maximum: Tested by ASTM D-2370 (December 2010); requires 1.4 minimum MPascal and the sample is 75mm long and 13mm wide, at 23°C with a gauge length of 25mm and a crosshead speed of 25mm / min Test; elongation at break: tested by ASTM D-2370 (December 2010), the sample is 75mm long and 13mm wide, tested at 23°C with a gauge length of 25mm and a crosshead speed of 25mm / min. At Weather-O-Meter TM After 1000 hours of accelerated weathering, the elongation must be 100% minimum.

[0095] Weather-O-Meter TM exposed: Weather-O-Meter TM The accelerated weathering method is the time period specified in ASTM D4798 (January 2011); the cycle used is A,...

example 3

[0101] Example 3: Synthesis of Gradient Emulsion Copolymers by Power-Feed Emulsion Polymerization

[0102] Emulsion polymerization was carried out in a four necked 5 liter round bottom reaction flask equipped with a condenser, mechanical stir bar, thermocouple, monomer feed line, initiator feed line and nitrogen inlet in the following manner:

[0103] A reactor mixture containing 500 g of deionized water and 15 g of β-cyclodextrin was added to the flask and its contents were heated to 90° C. with stirring under a nitrogen purge. A solution containing 0.65 g of sodium carbonate dissolved in 20 g of water was added to the heated reactor mixture, followed by a solution containing 2.6 g of ammonium persulfate (APS) dissolved in 20 g of water, followed by addition of a solution containing A solution of 2.2 g of ammonia (28% aqueous solution) in 3.0 g of water was further added containing 89.5 g of acrylic acid seed emulsion polymer (Tg=17.5C, 1.5wt% MAA, 45wt.% solids, weight ave...

example 2

[0106] Example 2: Synthesis of Gradient Emulsion Copolymers by Power-Feed Emulsion Polymerization

[0107] The method of preparing the gradient emulsion copolymer of Example 3 was repeated according to the composition indicated in Table 1 below, except that a portion (21.1% or 107.2 g) of the hard monomer was added to the soft monomer container and only 78.9% or 400 g Hard monomer is added to the hard monomer container.

[0108] The product emulsion copolymer had a solids content in the range of 54 wt.% to 56 wt.% and a weight average particle size (BI90) of 302 nm.

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Abstract

The present invention provides aqueous compositions for use as elastomeric roof coatings having excellent tint retention which comprise (i) one or more gradient emulsion copolymers having a weight average particle size of from 20 to 550 nm, (ii) a large particle size filler, preferably silica, (iii) one or more chromatic colorants other than a white colorant in the amount of from 0.2 to 15 wt.%, based on the total weight of solids in the composition, and (iv) other pigments, extenders or fillers, wherein the resulting composition has a particle volume concentration (% PVC) of from 20 to 65%. The present invention provides methods of making the one or more gradient emulsion copolymers.

Description

technical field [0001] The present invention relates to coating compositions for low volatile organic content (VOC) elastomeric roof and wall coatings with excellent shade retention, and to a process for preparing gradient emulsion copolymers comprising A glass transition temperature (measured as Tg) kinetic feed or gradient emulsion copolymer, one or more large particle size fillers, the emulsion copolymer being the copolymerization product of a soft monomer composition and a hard comonomer composition , the soft monomer composition, when polymerized, will provide a polymer having a calculated Tg below -5°C, and the hard comonomer composition, when polymerized, will provide a polymer having a calculated Tg of 20°C to 150°C The gradient emulsion copolymer further has a weight average particle diameter of 200nm to 550nm, preferably 225nm to 350nm, and the large particle diameter filler is selected from pigments, extenders and mixtures thereof, preferably silica, and is selected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/14C08F220/18C09D133/04C09D133/06C08K3/00C08J7/04C09D133/12C08K5/544C08J7/043C09D7/61
CPCC09D7/41C09D7/61C09D7/69C09D133/12C08J7/043C08F220/1804C08F220/1808C08F220/14C08F220/06C09D5/00
Inventor J·M·罗柯夫斯基A·E·埃文斯
Owner ROHM & HAAS CO
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