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Latex formulations with reduced yellowing

A technology of latex and formula, applied in the field of non-yellowing latex formula

Inactive Publication Date: 2003-08-27
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only a remedy in essence, and is not suitable for fundamentally solving this problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0056] The following abbreviations are used in the examples below:

[0057] AA: Acrylic

[0058] AAEM: Acetoacetoxyethyl methacrylate

[0059] APS: ammonium persulfate

[0060] BA: Butanol

[0061] Dytek_A: Dytek_A is a brand of 2-methyl-1,5-pentanediamine manufactured by DuPont.

[0062] Dytek_EP: Dytek_EP is a brand of 1,3-pentanediamine manufactured by DuPont.

[0063] 2-EHA: Isooctyl Acrylate

[0064] 1,6-HDPA: 1,6-ethylene glycol diacrylate

[0065] IBMA: Isobutyl methacrylate

[0066] MA: methyl acrylate

[0067] MAA: methacrylic acid

[0068] MMA: methyl methacrylate

[0069] St: Styrene

[0070] Percentages in all examples herein are by weight unless otherwise indicated. Generally speaking, the emulsion polymerization process described below is all carried out under nitrogen atmosphere.

example 1

[0071] Example 1: Single acrylic latex seeded with polystyrene

[0072] A reaction flask with a volume of 2 L was equipped with a mechanical stirring device, a reflux condenser, a thermometer and an inlet, and contained water (870 mL), latex seed crystals (68 g of a 33% by weight polystyrene emulsion), and Rhodapon_SLS (15 grams of 33% (percentage by weight) hydration solution); Rhodapon_SLS is a kind of sodium lauryl sulfate surfactant produced by Rhone Planck, adding APS initiator (3 grams of initiator solution) at 80°C in 15 ml of water). After waiting 5 minutes, a mixture of 2-EHA (59.8 grams), MMA (150 grams), MAA (13 grams) and AAEM (25.7 grams) was added to the stirred reaction mixture at a rate of about 3.8 grams / minute. Aqueous ammonium hydroxide (1.03 g ammonium hydroxide dissolved in 33 mL water) was then added to the stirred reaction mixture over an additional 5 minutes. The reaction mixture was then stirred at 80°C for 15 minutes, and MMA (36.3 grams), 2-EHA (1...

example 2

[0073] Example 2: Single acrylic latex with MMA seeds

[0074] A reaction flask with a volume of 2 liters was equipped with a mechanical stirring device, reflux condenser, thermometer and inlet, and contained water (870 ml), latex seed crystals (68 g of 33% by weight MMA emulsion) and Rhodapon_SLS brand Surfactant (15 grams of 33% (weight percent) hydration solution), APS initiator (3 grams of initiator dissolved in 15 milliliters of water) was added at 80°C. After waiting 5 minutes, a mixture of 2-EHA (59.8 grams), MMA (150 grams), MAA (13 grams) and AAEM (25.7 grams) was added to the stirred reaction mixture at a rate of about 3.8 grams / minute. Aqueous ammonium hydroxide (1.03 g ammonium hydroxide dissolved in 33 mL water) was then added to the stirred reaction mixture over an additional 5 minutes. The reaction mixture was then stirred at 80°C for 15 minutes, and MMA (36.3 grams), 2-EHA (155.2 grams), 1,6HDDA ( 11.0 g) and AAEM (7.53 g). After the addition was complete,...

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PUM

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Abstract

Latex formulations which exhibit a reduced amount of yellowing when exposed to heat, aldehydes or ultraviolet light contain polyfunctional amines, reducing agents, and / or reduced levels of styrene.

Description

field of invention [0001] The present invention relates to non-yellowing latex formulations. In particular, the present invention relates to latex formulations that exhibit reduced yellowing when exposed to heat or aldehydes or ultraviolet light. Background of the invention [0002] Polymers prepared by the emulsion polymerization process have a wide variety of applications. For example, latexes produced by emulsion polymerization are useful in paints, varnishes, polishes, films, inks, clear coats, stains, varnishes, print coatings, and powder coatings. [0003] It has long been known that latex tends to visibly yellow when exposed to heat or aldehydes or light, especially UV light. Yellowing has long been addressed in polymer chemistry by adding bluing agents to yellowed polymers. However, this method is only a remedy in essence, and is not suitable for fundamentally solving this problem. [0004] Yellowing of latex components is a prominent problem in clearcoats, espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/44C08F257/02C08F265/04C08F285/00C08F291/00C08L51/00
CPCC08F257/02C08F265/04C08F285/00C08L51/003C08L2666/02
Inventor 格雷戈里·M·卡纳德詹姆斯·W·泰勒大卫·L·特鲁波
Owner BASF CORP
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