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Emulsion based polymer adhesive

A technology of latex polymers and polymers, applied in the direction of graft polymer adhesives, ester copolymer adhesives, adhesive types, etc., can solve problems such as whitening, unresolved water, etc.

Active Publication Date: 2008-10-08
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While US Patent 6,060,532 attempts to address issues related to peel / shear balance, it does not address water whitening

Method used

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  • Emulsion based polymer adhesive
  • Emulsion based polymer adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] Environmental Chamber Shear Experimental Test Method

[0052] For each emulsion, the emulsion was coated on 0.0508mm thick polyethylene terephthalate (PET) at a certain rate using a 0.038mm Bird applicator to obtain a dry coating thickness of approximately 0.02mm , and dried in a forced-air oven at 82°C for 5 minutes. The coated film was roller laminated to a clear polyester film release liner and equilibrated overnight at 22°C and 50% relative humidity.

[0053] Cleaned, polished stainless steel panels and adhesive films were equilibrated for a minimum of 4 hours at 72°F and 50% relative humidity. The adhesive film was cut into 2.54 cm wide strips and laminated on a stainless steel plate twice (one round trip each) with a 1.82 kg roller at a speed of 61 cm / min. Using the jig, a 2.54 cm x 2.54 cm contact area was cut on the board with a tab protruding from the bottom of the board to which a weight could be attached. These samples were conditioned for 24 hours at 97°C...

Embodiment 1

[0079] Example 1 was prepared according to the procedure of Comparative Example 1, except that 216.6 grams of butyl acrylate was replaced by 216.6 grams of ethyl acrylate.

Embodiment 2

[0081] Example 2 was prepared according to the procedure of Comparative Example 1, except that 415.25 grams of ethyl acrylate was used instead of 451.25 grams of butyl acrylate.

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PUM

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Abstract

The invention relates to an emulsion-based polymer adhesive, specifically to a latex polymer prepared by the following steps: (a) preparing a first-stage polymer with at least one ethylenic linkage type unsaturated monomer emulsion by polymerization, (b) dispersing the following monomers in the first-stage polymer, including at least one additional ethylenic linkage type unsaturated monomer of a monomer having at least two alpha, beta-ethylenic linkage type unsaturated sites, such that the additional monomer is swollen into the first-stage polymer; and (c) polymerizing the additional monomer in the first-stage polymer swollen by the additional monomer. When used in adhesive formulations, the latex polymer exhibits a favorable level of peel and shear balance as well as a resistance to water whitening.

Description

technical field [0001] This invention relates to an improved hydropolymer of water insoluble latex polymers. The present invention further relates to emulsion-type pressure sensitive adhesive particles comprising an aqueous dispersion of the modified water-soluble latex. Background technique [0002] Adhesive applications require pressure sensitive adhesives (PSAs) that are highly resistant to water whitening, especially hot water. For example, a bottle labeled with a clear film PSA label may be subjected to pasteurization conditions where it is expected that the label will remain clear throughout the process. Historically, solvent-based adhesives have been used for this demanding application. However, environmental considerations prefer to remove the solvent. This and higher coating speeds result in emulsion adhesives whose use favors the replacement of solvent-borne PSAs. [0003] Emulsion PSA polymers are made in the presence of surfactants and other water-soluble ele...

Claims

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Application Information

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IPC IPC(8): C08F2/22C08F2/44C09J201/02C09J7/02
CPCC09J133/10C08F220/18C08F265/04C08F265/06C08L51/003C09J151/003C09J2203/334C08L2666/02C08F220/1802C08F220/1804
Inventor R·C·伊文
Owner ROHM & HAAS CO