초록 ▼

Binder for a pressure sensitive adhesive, characterized in that it exists as a polymer dispersed in water and obtained by emulsion polymerization of: (A) 65.0-99.4 percent by weight of one or more acrylic esters with 4-18, preferably 6-10 carbon atoms in the alcohol part of the ester, the esters bei

Binder for a pressure sensitive adhesive, characterized in that it exists as a polymer dispersed in water and obtained by emulsion polymerization of: (A) 65.0-99.4 percent by weight of one or more acrylic esters with 4-18, preferably 6-10 carbon atoms in the alcohol part of the ester, the esters being selected in such a way that a polymerization of only these esters gives a tacky polymer with a Tg-value below 0°C., preferably below -20°C. (B) 2.0-0.1 percent by weight of a polymerizable compound with the formula [Figure] or with the formula [Figure] wherein R1, R2, R3 and R4 are as defined in the specification (C) 5.0-0.5 percent by weight of at least one ethylenically unsaturated acid such as acrylic acid, methacrylic acid or itaconic acid and (D) 28.0-0 percent by weight of one or more compounds selected from the group consisting of alkyl- or hydroxyalkyl acrylate or a lower alkyl or hydroxyalkyl methacrylate with 1-3 carbon atoms in the alcohol part of the ester, acrylonitrile or styrene.

대표청구항 ▼

Process for the production of a binder for a pressure sensitive adhesive by emulsion polymerization of: (A) 65-99.4 percent by weight of at least one acrylic ester with 4-18 carbon atoms in the alcohol part of the ester, the esters being selected whereby polymerization of only the selected esters pr

Process for the production of a binder for a pressure sensitive adhesive by emulsion polymerization of: (A) 65-99.4 percent by weight of at least one acrylic ester with 4-18 carbon atoms in the alcohol part of the ester, the esters being selected whereby polymerization of only the selected esters produces a tacky polymer with a Tg-value below 0°C.; (B) 0.1 to 2 percent by weight of a polymerizable compound selected from the group consisting of a compound of the formula [Figure] where R1=H or CH3, R2=H or [Figure] and R3=CH3, C2H5, OH, CH2OH or [Figure] or a compound with the formula [Figure] where R4=CH3 or CH2CH=CH2 (C) 5-0.5 percent by weight of at least one ethylenically unsaturated acid and (D) 28-0 percent by weight of one or more compounds selected from the group consisting of an alkyl acrylate, a hydroxyalkyl acrylate, a lower alkyl methacrylate, a hydroxyalkyl methacrylate with 1-3 carbon atoms in the alcohol part of the ester, acrylonitrile or styrene, said process comprising first copolymerizing the compounds from the groups (A), (C) and (D) in water at a temperature of about 40°-90°C. for ¼to ⅞of the total reaction time, and then mixing therewith a compound from group (B) and completing the reaction.