PROTECTIVE ADHESIVE CARRYING TAPE

摘要

The adhesive strip is used for producing resistant protective coatings on substrates such as letterings. The main constituent of the adhesive composition applied on one side of a thermoplastic carrier film is polyunsaturated ester which contains urethane or urea groups and is free-radically polymerisable with crosslinking. This ester is a multiple ester of monocarboxylic acid containing the grouping CH2=C-COOH; it has the constitution of a reaction product of A) an organic polyisocyanate with B) a polymerisable monomer which is an ester of said monocarboxylic acid. For the reaction with an isocyanate group of A) the ester B) contains a hydroxyl or nontertiary amine group in the radical of the hydroxyl compound with which said monocarboxylic acid is esterified. For curing using UV radiation the adhesive composition may contain a UV-activable polymerisation initiator and be applied to a UV-transmitting carrier film. Instead it may also incorporate an amine as co-reactant for a peroxide activator to be applied to the substrate surface before the strip is applied. After the adhesive composition has cured, the carrier film can be peeled off.