| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cold seal adhesive comprising a multi-stage polymer having a low-Tg first stage and a high-Tg second stage. <P>SOLUTION: A method for forming a cold seal on a polymer film; comprises (a) applying to the polymer film a layer of a polymer latex comprising a polymer having a first phase and a second phase, where the first phase has a Tg from -60°C to -20°C, from 0.5% to 8% carboxylic acid monomer residues, and at least 50% of residues derived from 4-22C alkyl acrylates; and the second phase has a Tg of at least 30°C and at least 0.5% less carboxylic acid monomer residue than the first phase; wherein the first phase is from 60% to 95% of the polymer; and (b) forming a seal by contacting two polymer film surfaces comprising a layer of polymer latex to form a seal without heating. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
