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Partially crosslinked microspheres

a microsphere and adhesive technology, applied in the field of microsphere adhesives, can solve the problems that the control of the solvent soluble portion of the microsphere to produce a stable repositionable microsphere adhesive with enhanced adhesion has not been considered, and achieves the effects of improved adhesion, easy removal from applied surfaces, and high adhesion

Inactive Publication Date: 2002-02-26
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Advantageously, the present invention provides a microsphere-based pressure sensitive adhesive having a high solvent soluble fraction that adheres to rough surfaces such as fabric, removes cleanly, and exhibits the ability to be reapplied multiple times if desired. Even with this enhanced adhesion to rough surfaces the microsphere adhesive will still adhere non-destructively to fragile surfaces such as paper. Furthermore, the microsphere adhesive of this invention is prepared according to resource efficient methods.

Problems solved by technology

However, to date, control of the solvent soluble portion of the microsphere to produce a stable repositionable microsphere adhesive with enhanced adhesion has not been contemplated.

Method used

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  • Partially crosslinked microspheres
  • Partially crosslinked microspheres
  • Partially crosslinked microspheres

Examples

Experimental program
Comparison scheme
Effect test

example 1

To a two liter, three necked flask equipped with a thermometer mechanical stirrer and nitrogen inlet tube was charged 597.5 gm of deionized water, 35 gm of a 10% solids solution of Stepanol AMV (trade name for a 28% solids solution of ammonium lauryl sulfate commercially available from Stepan Company), 17.5 gm of a 10% solution of Goodrite K702 (trade name for a 25% solids solution of polyacrylic acid, 240,000 weight average molecular weight, commercially available from B.F. Goodrich Company) which had been neutralized to a pH of 7.0 with concentrated ammonium hydroxide. To this solution was added 350 gm of isooctyl acrylate and 1.1 gm of Perkadox 16N (trade name for a 95% active bis (4-tert-butylcyclohexyl) peroxydicarbonate initiator commercially available from AKZO Chemicals Inc.), and 0.14 gm (0.04% by weight of the monomer) of dodecanethiol (a chain transfer agent commercially available from Aldrich Chemical Company). The agitation rate was set at 410 revolutions per minute (RP...

example 2-6

The examples were prepared according to the procedure described in Example 1 except that the amount of dodecanethiol was changed and the amount and type of comonomer was changed. The formulations and test results are summarized in Tables 1 and 2 below.

TABLE 1 % Solvent Particle Soluble Example Comonomer % Dodecanethiol Size (.mu.m) Portion 1 None 0.04 54 57 2 1% Hydroxy 0.04 53 71 Ethyl Methacryl- ate 3 1% Acrylic Acid 0.03 43 83 4 0.5% Acrylic 0.02 34 92 Acid 5 1% N Vinyl 0.02 42 65 Pyrrolidone 6 1% Acrylamide 0.03 35 80

TABLE 1 % Solvent Particle Soluble Example Comonomer % Dodecanethiol Size (.mu.m) Portion 1 None 0.04 54 57 2 1% Hydroxy 0.04 53 71 Ethyl Methacryl- ate 3 1% Acrylic Acid 0.03 43 83 4 0.5% Acrylic 0.02 34 92 Acid 5 1% N Vinyl 0.02 42 65 Pyrrolidone 6 1% Acrylamide 0.03 35 80

example 9

To a two liter, three-necked flask equipped with a thermometer, mechanical stirrer and nitrogen inlet tube was charged 158 grams of a 0.7% solids solution of Standapol A (trade for a 28% solids solution of ammonium lauryl sulfate commercially available from Henkel Corporation), 158 grams of 1.6% solution of acrylic acid in deionized water, and enough concentrated ammonium hydroxide to neutralize the solution to pH 7. To this solution was added a solution comprised of 100 grams of isooctyl acrylate, 5 grams of heptane and 0.488 grams of Lucidol 70 (trade name for a 70% active benzoyl peroxide initiator commercially available from Pennwalt Corporation). The agitation rate was set to 400 rpm. The reaction mixture was heated to 65.degree. C., purged with nitrogen and reacted at 65.degree. C. for 8 hours. The reaction was then cooled and filtered through cheesecloth. The particle size was 41 .mu.m and the % solvent soluble portion was 59%.

This example showed that solvent could be used as...

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Abstract

An adhesive composition is provided comprising:(a) a plurality of polymeric, elastomeric microspheres wherein the microspheres are the reaction product of reactants comprising polymerizable starting materials comprising at least one C4-C14 alkyl (meth)acrylate monomer and optionally at least one comonomer and have a solvent soluble portion that is 30-98% of the microsphere.

Description

TECHNICAL FIELDThis invention relates to a microsphere adhesive and in particular to a microsphere adhesive that exhibits enhanced adhesion to substrates while remaining repositionable.BACKGROUND OF THE INVENTIONRepositionable adhesives are commonly used for temporary messaging or signage in the home and office environment. This type of product is typified by Post-it.RTM. brand notes. When using such a product it is desired that the note adhere to a variety of surfaces yet be cleanly removable from the surface without leaving adhesive residue, while maintaining the repositionable characteristics of the notes.References can be cited for the preparation and / or use of inherently tacky, polymeric microsphere adhesives (see for example, U.S. Pat. Nos. 3,691,140 and 4,166,152). Such microsphere adhesives are typically used for the commonly recognized repositionable notes.Various investigators have sought to improve or further enhance adhesion to surfaces other than the commonly used paper...

Claims

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Application Information

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IPC IPC(8): C08F20/00C08F20/18C09J133/06C08F8/00C08F2/44C08F20/10C09J121/00C09J201/00
CPCC08F20/18C09J133/06Y10T428/24893C08L2205/18C08F2/44C09J133/08C09J133/10
Inventor COOPRIDER, TERRENCE E.CRANDALL, MICHAEL D.GARBE, JAMES E.GOETZ, RICHARD J.KESTI, MICHAEL R.
Owner 3M INNOVATIVE PROPERTIES CO
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