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Wet glue

09796888 ยท 2017-10-24

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Abstract

An aqueous adhesive composition including a certain emulsion polymer and an epoxysilane wherein the adhesive composition is substantially free from crosslinking agent is provided. A method for providing a substrate bearing a paper label, the adhered label having ice water resistance, and a method for removing the paper label from the substrate are also provided.

Claims

1. A method for removing a paper label from a substrate, comprising: providing the substrate bearing the paper label, the paper label comprising: an aqueous adhesive composition substantially free from crosslinking agent, the adhesive composition comprising: an emulsion polymer comprising, as copolymerized units, from 10% to 35%, by weight based on the emulsion polymer weight, carboxylic acid monomer and at least one second ethylenically unsaturated monomer; and from 0.1% to 4%, by weight based on the emulsion polymer dry weight, an epoxysilane; and contacting the removable paper label with an alkaline solution for a time and at a temperature sufficient to remove the paper label.

2. The method of claim 1, wherein the time is not to exceed 5 minutes.

3. The method of claim 1, wherein the temperature is from 65 to 75 C.

Description

EXAMPLES 1-2 and COMPARATIVE EXAMPLES A-B

Formation and Evaluation of Aqueous Adhesive Compositions

(1) The aqueous adhesive compositions were applied to a paper label at a level of 24 g/m2 wet with a No.3 bar and dried for 4 days at ambient conditions.

(2) TABLE-US-00001 Example 1 2 Comp. A Comp. B Polymer B + Polymer A + Polymer D + Polymer C + 2% SILQUEST 2% SILQUEST 2% SILQUEST 2% SILQUEST A-187 A-187 A-187 A-187 Solids % 35.3 29.4 8.5 30.7 pH 7.1 8.1 7.8 7.26 Add-on (24 g/m.sup.2 wet with bar n3) dry (5-8 g/m.sup.2) 8 6.6 5.9 6.8 Ice water resistance >15 days 6 days >15 days 3 hours Wash-off test 4 min < wash off < 1 min >5 min NA (Final FTM26)* 5 min no adhesive (minutes) no adhesive remained remained on the bottles on the bottles *soda bath at 1.5%/temperature: 71.4 C.

(3) SILQUEST A-187 is an epoxy functional silane from Momentive Specialty Chemicals Inc. (Columbus, Ohio).

(4) The aqueous adhesive compositions, Examples 1-2, of the invention exhibited desirable levels of ice water resistance and wash off performance