Pressure-sensitive adhesive susceptible to ultraviolet light-induced detackification
AssigneeMinnesota Mining and Manufacturing Company
InventorsRichard E. Bennett, Mary A. Hittner
Life of this patent
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Abstract
"Release on demand" pressure-sensitive adhesives and tapes which are readily detackifiable by exposure to actinic radiation. The adhesive system has an oxirane ring-bearing component blended thereinto (or preferably reacted therewith) to achieve an adhesive epoxy equivalent value of 400-900, preferably 450-700. The adhesive system also includes an effective amount of ionic photoinitiator capable of promoting the polymerization of oxirane rings.
Claims10
Normally tacky and pressure-sensitive adhesive having an epoxy equivalent value of about 400-900 and including an effective amount of ionic photoinitiator selected from the group consisting of radiation-sensitive aromatic onium salts of Group Va or VIa;
- onium catalysts of Group Va, VI or VIIa, diaryl halonium salts containing Group Va metal hexafluorides and triaryl sulfonium complex salts capable of promoting the polymerization of oxirane rings, whereby said adhesive is readily detackified by exposure to actinic radiation.
Dependencies are inferred from the claim text.