초록 ▼

Acrylate-based pressure-sensitive adhesives are produced by a process in which a liquid, polymerizable monomer composition containing at least one acrylate monomer is placed in a closed reaction vessel, deaerated and the monomer(s) are polymerized by exposure to ionizing radiation such as gamma irra

Acrylate-based pressure-sensitive adhesives are produced by a process in which a liquid, polymerizable monomer composition containing at least one acrylate monomer is placed in a closed reaction vessel, deaerated and the monomer(s) are polymerized by exposure to ionizing radiation such as gamma irradiation. The process allows for the direct production of low-solvent or solventless acrylate-based adhesives suitable for application by hot-melt techniques.

대표청구항 ▼

A process for preparing a substrate for bonding which comprises applying to the substrate by hot-melt application a pressure-sensitive adhesive which is produced by the process which comprises: (a) introducing, to a sealable reaction vessel, a liquid, polymerizable monomer composition, comprising: (

A process for preparing a substrate for bonding which comprises applying to the substrate by hot-melt application a pressure-sensitive adhesive which is produced by the process which comprises: (a) introducing, to a sealable reaction vessel, a liquid, polymerizable monomer composition, comprising: (i) from 65 to 100 parts of at least one acrylate monomer of the formula: [Figure] wherein R1 is hydrogen or methyl and R2 is a straight or branched chain alkyl having from 2 to 8 carbon atoms, (ii) from 0 to 35 parts of at least one ethylenically unsaturated comonomer per 100 parts of liquid polymerizable monomer composition; and (b) dearating the liquid polymerizable monomer composition before or after introducing it into the vessel; and (c) polymerizing the monomers in the containers by exposing them to ionizing radiation, at a dose rate greater than 1 kilorad per hour and less than 1 kilorad per second, said polymerization being carried out in the presence of less than 30% by weight of an organic solvent, based on the combined weight of the liquid, polymerizable monomer composition and solvent, so as to produce a viscoelastic polymer mass having a low level of residual monomer and oapable of hot-melt application.