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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 adhesives, adhesive additives, ester polymer adhesives, etc., can solve the problems that none of the above patents/publications disclose the preparation of pressure sensitive adhesives, and achieve the effect of improving the resistance to water-whitening

Inactive Publication Date: 2005-11-03
CYTEC SURFACE SPECIALTIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] It is an object of this invention to provide pressure sensitive adhesive (“PSA”) compositions having resistance to water-whitening. It is another object of this invention to provide a process(es) for preparing pressure sensitive adhesives having enhanced resistance to water-whitening.
[0011] Still further according to the invention, pressure sensitive adhesives having enhanced resistance to water-whitening produced by the process(es) described above are provided.

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

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example 1

[0068] In a 2L jacketed glass reactor equipped with a reflux condenser, thermocouple and twin blade agitator, a poly(acrylate-co-styrene) latex was prepared. Monomer pre-emulsion was prepared by mixing 122.8 g water, 307.34 g 2-EHA, 70 g S, 65.68 g MA, 9.56 g MAA, and 13.4 g AA with 4.28 g Hitenol KH-05. The reactor was charged with 296.72 g of water, 1.8 g PPS, and 1.47 g of Hitenol KH-05. Separately, 72.12 g of PPS stock solution (2.86 wt. % concentration) was prepared in water. The reactor was heated with water. When the temperature reached 78° C., 6 g of the PPS stock solution was added and the monomer pre-emulsion delay was started at a 3.03 g / min rate and continued for 200 minutes. The temperature was maintained at 83° C. and the polymerization charge agitated continuously at 240 rpm. Every 20 min, 6 g of the PPS stock solution was added to the reactor over a period of 220 minutes. After the final charge of the PPS stock solution was completed, the reactor temperature was rais...

example 2

[0071] In a 2L jacketed glass reactor equipped with a reflux condenser, thermocouple and twin blade agitator, a poly(acrylate-co-styrene) latex was prepared. Monomer pre-emulsion was prepared by mixing 122.8 g water, 307.34 g 2-EHA, 70 g S, 65.68 g MA, 9.56 g MAA, and 13.4 g AA with 9.27 g Polystep NMS-7. The reactor was charged with 296.72 g of water, 1.8 g PPS, and 3 g of Polystep NMS-7. Separately, 72.12 g of PPS stock solution (2.86 wt. % concentration) was prepared in water. The reactor was heated with water. When the temperature reached 78° C., 6 g of the PPS stock solution was added and the monomer pre-emulsion delay was started at a 3.03 g / min rate and continued for 200 minutes. The temperature was maintained at 83° C. and the polymerization charge agitated continuously at 240 rpm. Every 20 min, 6 g of the PPS stock solution was added to the reactor over a period of 220 minutes. After the final charge of the PPS stock solution was completed, the reactor temperature was raise...

example 3

[0074] In a 2L jacketed glass reactor equipped with a reflux condenser, thermocouple and twin blade agitator, a poly(acrylate-co-styrene) latex was prepared. Monomer pre-emulsion was prepared by mixing 122.8 g water, 271.4 g 2-EHA, 116.5 g S, 57.55 g MA, 8.2 g MAA, and 12.35 g AA with 4.28 g Hitenol KH-05. The reactor was charged with 296.72 g of water, 1.8 g PPS, and 1.47 g of Hitenol KH-05. Separately, 72.12 g of PPS stock solution (2.86 wt. % concentration) was prepared in water. The reactor was heated with water. When the temperature reached 78° C., 6 g of the PPS stock solution was added and the monomer pre-emulsion delay was started at a 3.03 g / min rate and continued for 200 minutes. The temperature was maintained at 83° C. and the polymerization charge agitated continuously at 240 rpm. Every 20 min, 6 g of the PPS stock solution was added to the reactor over a period of 220 minutes. After the final charge of the PPS stock solution was completed, the reactor temperature was ra...

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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) a hydrophobic monomer mixture of at least one alkyl acrylate or alkyl methacrylate ester of an alcohol wherein the alkyl portion of the alcohol is linear or branched and contains at least 4 carbon atoms, and at least one styrenic monomer, wherein the styrenic monomer is up to about 30 wt. % of the total hydrophobic monomer mixture, (ii) at least about 1 wt. % of at least one hydrophilic monomer, (iii) at least about 5 wt. % of at least one partially hydrophilic monomer selected from alkyl acrylate or alkyl methacrylate esters of an alcohol wherein the alkyl portion of the alcohol has 1 to 2 carbon atoms, N-vinyl-2-pyrrolidone, or mixtures thererof, and (iv) a water-soluble or water-dispersible polymerizable surfactant selected from compounds having a terminal allyl amine moiety, 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 nonprovisional application which claims the priority of prior provisional application Ser. No. 60 / 305,174, filed Jul. 13, 2001 and is a continuation-in-part of application Ser. No. 10 / 142,455, filed May 10, 2002, the disclosures of which are incorporated herein by reference in their entirety.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 in washing op...

Claims

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Application Information

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IPC IPC(8): C09J133/08C08F220/18C09J11/02C09J11/08C09J133/06
CPCC08F220/18C09J2201/606C09J133/064C09J2301/302C08F220/1808C08F220/14C08F212/08C08F226/10C08F2/44C08F2/001
Inventor CHEN, AUGUSTIN T.GUO, JONG-SHINGPERNECKER, TIBOR
Owner CYTEC SURFACE SPECIALTIES INC
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