Emulsion adhesive for washable film
An adhesive layer, pressure-sensitive adhesive technology, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc. Difficulty removing polymer labels
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[0027] In the preparation of the acrylic emulsion polymer, a neutralizing agent is included. "Neutralizer" means a basic material capable of acid-base reaction with an acid monomer. Suitable neutralizing agents include polyhydroxy functional amines such as triethanolamine, 2-[bis-(2-hydroxyethyl)-amino]-2-hydroxymethylpropane-1,3-diol (Bis-Tris methane ), 2-amino-2-(hydroxymethyl)-1,3-propanediol (Trizma base), N-methyl-D-glucosamine, N,N,N′N′-tetrakis-(2-hydroxy Ethyl)-ethylenediamine and N,N,N'N'-tetrakis-(2-hydroxypropyl)-ethylenediamine.
[0028] Organic salts such as sodium citrate, sodium gluconate, or sodium acetate can be used in combination with neutralizing agents to enhance the removability of the adhesive. Inorganic acid salts may also be used. Alternatively, organic acids neutralized by hydroxylamine can be used. Non-limiting examples of organic acids include: acetic acid, p-toluenesulfonic acid, citric acid, gluconic acid, maleic acid, and dodecylbenzenesulfo...
Embodiment A-D
[0059] Examples A-D: Preparation of Base Polymers
[0060] Using the components shown in Table 2, the base polymer was prepared by radical emulsion polymerization according to the following procedure. Table 2
[0061] The reactor, equipped with a stirrer, heat source and nitrogen inlet, was purged with nitrogen and charged with water, then heated to 78°C. Potassium persulfate or ammonium persulfate was added to the reactor, and the reactor contents were mixed for five minutes. Thereafter, the preemulsion mixture was introduced into the reactor over a period of 230 minutes. The temperature of the reactor was raised to 79-81°C and then maintained at this temperature throughout the polymerization. After the preemulsion feed was started, the initiator solution feed was started. Twenty-five minutes after the preemulsion feed was complete, the initiator feed was completed and the reactor contents were held at 79-81°C for 60 minutes. The reactor contents were then allowed to...
Embodiment 1-8
[0062] Examples 1-8: Preparation of Pressure Sensitive Adhesives
[0063] Using the base polymers described above, a series of pressure sensitive adhesive compositions were prepared by compounding the base polymers and neutralizing them with hydroxyl functional amines or mixtures thereof. In several examples, salts of organic acids are used.
[0064] Table 3 gives the neutralizers and their salts, if any, used to produce the adhesive compositions of Examples 1-8 and Comparative Example A. Examples 1-7 were prepared using Base Polymer A. Example 8 was prepared using base polymer B. Comparative Example A is Base Polymer A neutralized with ammonia water. The listed amounts of neutralizing agent and salt are in parts by weight per hundred parts dry polymer.
[0065] The abbreviations used below are as follows: Bis Tris methane 2-[bis-(2-hydroxyethyl)-amino]-2-hydroxymethylpropan-1,3-diol TEA triethanolamine Trizma 2-amino-2-(hydroxy Methyl)-1,3-propanediol NMDG N-methyl-D-glu...
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