Crosslinking of acrylate copolymers
The mechanism of crosslinking acrylate copolymers with alkyl orthotitanates or with metal acetylacetonates has been elucidated on the examples of the products of copolymerization of 2-ethylhexyl, n-butyl and 2-hydroxyethyl acrylates with acrylic acid. COOH- and OH-groups of the copolymer are involved in the crosslinking reaction. The effect of the kind of alkyl radical in the orthotitanate and of the metal atom in the acetylacetonate on the reactivity of the crosslinking agent used as well as on the adhesive properties and storage life of the pressure-sensitive adhesives prepared from the copolymer under study has been determined. The longest storage life exhibited adhesives containing acetylacetonates of titanium, aluminium and iron. The same acetylacetonates improve cohesion. Aliphatic C1—C4—alcohols in an amount of 20—30 weight percent have been used as stabilizers of the adhesive. The type of alcohol used has no influence on its stabilizing effectiveness.
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