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Itaconic acid polymers for improved dirt and water resistance for elastomeric wall and roof coatings

A water-based composition, mixture technology, applied in the direction of roofing, roofing, coating, etc. using tile/slate, can solve the yellowing of the coating film, reduce low temperature flexibility, does not provide water swelling resistance and stain resistance Roof coating and other issues

Active Publication Date: 2014-08-20
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed compositions do not provide acceptable roof coatings with improved water-swell and stain resistance
In addition, the coating compositions disclosed in the Rubizo patent contain amounts of styrene in the form of copolymers which have been shown to cause outdoor durability issues such as yellowing of the coating film and reduced low temperature flexibility and crack bridging

Method used

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  • Itaconic acid polymers for improved dirt and water resistance for elastomeric wall and roof coatings
  • Itaconic acid polymers for improved dirt and water resistance for elastomeric wall and roof coatings
  • Itaconic acid polymers for improved dirt and water resistance for elastomeric wall and roof coatings

Examples

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Embodiment

[0078] Examples: The following examples illustrate the advantages of the invention.

[0079] Test Methods: The following test methods were used in the examples shown:

[0080] Mechanical properties: use the ASTM D-2370 (2010.12) standard to test the maximum tensile strength, the requirements are: use a minimum of 1.4 MPa and a 75 mm long and 13 mm wide sample, at a temperature of 23 ° C, a crosshead speed of 25 mm / min , the gauge length is 25 mm; use ASTM D-2370 (2010.12) standard to test the elongation at break, the sample is 75 mm long and 13 mm wide, at 23 °C, the crosshead speed is 25 mm / min, and the gauge length is 25 mm mm. Elongation must be 100% minimum after 1000 hours; exposure to Weather-O-Meter TM ): During the specified time, the Weather-O-Meter (Weather-O-Meter TM ) The accelerated weathering method adopts the ASTM D4798 (2011.1) standard; the cycle used is A, the temperature of the non-insulated blackboard is 63°C, and the daylight filter is used, and the t...

Embodiment 6

[0095] Example 6 was prepared according to the general copolymer synthesis method described above, except that when 50% of the total volume of the monomer emulsion had been added to the reactor flask (about 94 minutes after the start of feeding), 2.8 g n-DDM.

[0096] Synthesis of Copolymer 7 (Table 1):

Embodiment 7

[0097] Example 7 was prepared according to the general copolymer synthesis method described above, except that when 75% of the total volume of the monomer emulsion had been added to the reactor flask (about 137 minutes after the start of feeding), 2.8 g n-DDM.

[0098] Table 1: Emulsion copolymers containing itaconic acid:

[0099]

[0100] *CE1 polymer contained 0.3 wt% BZP, 0.3 wt% benzophenone was added to all other emulsion polymers prior to formulation.

[0101] In Examples CE1 to 8 described in Table 1, the amount of itaconic acid varied between 0.21% and 1.21%. Examples 6 and 7 were prepared in the presence of 0.83% itaconic acid with the addition of 0.15% n-dodecyl mercaptan at 50% or 70% feed completion. Except where noted, all coating compositions were prepared from a 43% PVC / 51% volume solids formulation (shown in Table 1A below) with 47 lbs. of zinc oxide per 100 gallons. Unless otherwise stated, the coating compositions were formulated using a Kohlers high...

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Abstract

The present invention provides aqueous coating compositions comprising one or more emulsion copolymer made from itaconic acid, a sulfonic acid or sulfonate ester monomer and an additional acid monomer which is a carboxylic acid and having a glass transition temperature of from -45°C to -10°C, and one or more pigment, opacifier, filler, extender, or mixture of any of these at a %PVC of from 20 to 55, preferably 30 to 50, wherein coatings made from the coating compositions provide improved resistance to water swelling and dirt pickup resistance. The improvements are observed regardless of whether the compositions contain or are substantially free of zinc or divalent metal ions, or salts or compounds containing them. The present invention also provides roofing substrates coated with the aqueous compositions.

Description

technical field [0001] The present invention relates to elastomeric roof coating compositions comprising elastomeric acrylic emulsion copolymers containing carboxyl groups and having good water-swell and stain resistance. In particular it relates to an aqueous coating composition comprising an emulsion copolymer having a glass transition temperature (Tg) of -45°C to -10°C, the emulsion copolymer being the copolymerization product of the following monomer mixture: (a) 65% by weight - 94% by weight of one or more (meth)acrylic acids C 4 -C 24 Alkyl esters, such as 2-ethylhexyl acrylate (2-EHA), (b) 5.65-34.65% by weight of hard vinyl monomers, such as (meth)acrylic acid C 1 -C 4 Alkyl esters, preferably methyl methacrylate (MMA) or (meth)acrylonitrile (AN), (c) 0.25% to 1.6% by weight, preferably 0.4 to 1.0% by weight of itaconic acid (IA), and (d) 0.1-2.25% by weight, preferably equal to or less than 1.0% by weight, of one or more other acid monomers selected from ethylenic...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F222/02C08F220/14C08F228/02C09D133/08
CPCC09D4/00E04D1/20C08F220/06C08F222/02C04B26/06C04B2111/00482C04B2111/00586C09D133/08C08F220/1804C08F220/585C04B14/28C04B14/30C04B14/305C04B22/16C04B24/02C04B24/2641C04B24/383C04B2103/50C04B2103/67C08F220/14C08F220/36
Inventor J·M·罗考斯基A·E·埃文斯A·W·弗里曼S·A·克里希曼诺
Owner ROHM & HAAS CO
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