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Process for improving water-whitening resistance of pressure sensitive adhesives

a technology water-whitening resistance, which is applied in the direction of adhesive types, coatings, emulsion paints, etc., can solve the problems that none of the above patents/publications disclose the preparation of pressure sensitive adhesives, and achieve enhanced resistance to water-whitening and water-whitening. the effect o

Inactive Publication Date: 2007-05-03
CHEN AUGUSTIN T +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting PSAs exhibit significantly improved resistance to water-whitening, with minimal absorbance increase after immersion in water, maintaining adhesion and transparency, even in hot water environments.

Problems solved by technology

None of the above patents / publications disclose preparing pressure sensitive adhesives wherein a polymerizable surfactant is used.

Method used

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  • Process for improving water-whitening resistance of pressure sensitive adhesives
  • Process for improving water-whitening resistance of pressure sensitive adhesives
  • Process for improving water-whitening resistance of pressure sensitive adhesives

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] In a 2 L jacketed glass reactor equipped with a reflux condenser, thermocouple and twin blade agitator, 701.5 g of polyacrylate latex was prepared. Monomer pre-emulsion was prepared by mixing 110 g water, 192.4 g 2-EHA, 64 g BA, 45 g MA, 6.25 g MAA, and 9.75 g AA with 9.27 g Polystep NMS-7. The reactor was charged with 140 g of water and 3 g of Polystep NMS-7. Separately, 117 g of PPS stock solution (0.94 wt. % concentration) was prepared in water. The reactor was heated with water. When the temperature reached 79° C., 0.75 g PPS was added followed by continuous addition of the monomer pre-emulsion at a 2.1-2.2 g / min rate for 3.5 hr. The temperature was maintained at 83° C. and the polymerization charge agitated continuously at 240 rpm. Every 20 min, 10 g of the PPS stock solution was added to the reactor. After the pre-emulsion addition was complete, the reactor temperature was raised to 85° C. and agitated for an additional 40 min after which 1.5 g VeoVa 5 was added to the ...

example 2

Control

[0087] In a control experiment, latex was prepared according to the procedure described in Example 1 except conventional surfactants were used in place of the Polystep NMS-7. Thus, 5.3 g Abex EP-120 (30% solids) was used in the initial reactor charge, and 3.2 g Abex EP-120, 0.78 g AOT 75, and 3.88 g Igepal Co-630 was used to stabilize the pre-emulsion. The final latex had an average particle size of 87 nm, 46.9% solids, pH=2.24, and Brookfield viscosity of 546. The latex was neutralized to pH 7.84. The latex film was direct coated as described in Example 1, and the UV / VIS absorbance was measured in room temperature water during a 24 hr immersion test. The final absorbance was 0.388 (curve # 3 in FIG. 1).

[0088] The results of Examples 1 and 2 demonstrate that the PSAs of the invention have significantly improved resistance to water-whitening compared to a similar polymer prepared using conventional surfactants.

example 3

[0089] A polymerization was carried out according to the procedure described in Experiment 1 except instead of 2-EHA, 192 grams of iOA was emulsified with BA, MA, AA, and MAA.

[0090] The latex had 47.5% solids. The average particle size was 98 nm and pH=2.23. Brookfield viscosity was 740 cp. The latex was neutralized to a pH of 7.98 with NH4OH.

[0091] Latex film was prepared by direct coating on Mylar at 1 mil coat weight. The change of absorbance after 24 hr room temperature immersion was 0.039.

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Abstract

Pressure sensitive adhesive compositions having enhanced resistance to water-whitening comprising an aqueous emulsion polymer are disclosed. The polymer comprises the polymerization reaction product of a polymerizable aqueous emulsion comprising: (i) at least one hydrophobic alkyl acrylate or alkyl methacrylate ester of an alcohol, (ii) at least about 1 wt. % of at least one hydrophilic monomer, (iii) at least about 5 wt. % of at least one partially hydrophilic alkyl acrylate or alkyl methacrylate ester of an alcohol, and (iv) a water-soluble or water-dispersible polymerizable surfactant selected from compounds having a terminal allyl amine moiety, substituted phenyl compounds having at least one alkenyl substituent, polyoxyalkylene-1-(allyloxymethyl)alkyl ether sulfate salts, or mixtures thereof, and the average particle size of the polymer is less than or equal to 200 nm. Also disclosed are processes for preparing same.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a continuation application of nonprovisional application Ser. No. 10 / 142,455, filed May 10, 2002, which claims the priority of prior provisional applications Ser. No. 60 / 305,174, filed Jul. 13, 2001 and Ser. No. 60 / 323,984, filed Sep. 21, 2001, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] This invention relates to pressure sensitive adhesives based on aqueous emulsions and processes for preparation of the adhesives. The pressure sensitive adhesives of the invention have enhanced resistance to water-whitening. [0003] These pressure sensitive adhesives are particularly suitable for applications that require that the pressure sensitive adhesive maintain adhesion between the substrate and facestock when subjected to hot water spraying or immersion. Hot water adhesion is required in applications such as bottle labels where the bottles are subjected to hot water spraying i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L41/00C08F220/18C09J133/02C09J11/00C09J133/06C09J135/00
CPCC08F220/18C09J133/064C09J2201/606C09J2301/302C08F220/1808C08F220/14C08F2/44C08F2/001
Inventor CHEN, AUGUSTIN T.GUO, JONG-SHINGPERNECKER, TIBOR
Owner CHEN AUGUSTIN T
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