Transparent two-part acrylic adhesive composition and the method of use thereof
First Claim
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1. In a curable two-part adhesive composition wherein one part comprises a polymerizable acrylic monomer and an effective amount of a stabilized organoboron amine complex initiator of the formula:
- ##STR6## where R, R1 and R2 are alkyl of 1 to 10 carbon atoms or phenyl, R3 and R4 are hydrogen or alkyl of 1 to 10 carbon atoms;
or ##STR7## where R5 and R6 are hydrogen or alkyl of 1 to 10 carbon atoms, m is 2 to 10 and n is 1 to 6; and
the second part contains an effective destabilizing amount of an organic acid activator having the formula;
space="preserve" listing-type="equation">R--COOHwhere R is H, alkyl or alkenyl of 1 to 8 carbon atoms or aryl of 6 to 10 carbon atoms, the improved composition providing a transparent or clear bond in the cured adhesive wherein the acrylic monomer comprises about 45% or more by weight, based on the total weight of acrylic monomer in the composition, of a monomer selected from the group consisting of benzyl acrylate or methacrylate, 2-phenoxyethyl acrylate or methacrylate, phenyl acrylate or methacrylate and 2-phenylethyl acrylate or methacrylate.
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Abstract
In a two-part adhesive composition wherein one-part comprises a polymerizable acrylic monomer and an organoboron amine complex and the second-part contains an organic acid destabilizer and optional acrylic polymer, the improvement wherein a transparent or clear bond is provided in the cured adhesive composition by having about 45% or more by weight of the total acrylic monomer in the composition comprising selected phenyl containing acrylic compounds.
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12 Claims
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1. In a curable two-part adhesive composition wherein one part comprises a polymerizable acrylic monomer and an effective amount of a stabilized organoboron amine complex initiator of the formula:
- ##STR6## where R, R1 and R2 are alkyl of 1 to 10 carbon atoms or phenyl, R3 and R4 are hydrogen or alkyl of 1 to 10 carbon atoms;
or ##STR7## where R5 and R6 are hydrogen or alkyl of 1 to 10 carbon atoms, m is 2 to 10 and n is 1 to 6; and
the second part contains an effective destabilizing amount of an organic acid activator having the formula;
space="preserve" listing-type="equation">R--COOHwhere R is H, alkyl or alkenyl of 1 to 8 carbon atoms or aryl of 6 to 10 carbon atoms, the improved composition providing a transparent or clear bond in the cured adhesive wherein the acrylic monomer comprises about 45% or more by weight, based on the total weight of acrylic monomer in the composition, of a monomer selected from the group consisting of benzyl acrylate or methacrylate, 2-phenoxyethyl acrylate or methacrylate, phenyl acrylate or methacrylate and 2-phenylethyl acrylate or methacrylate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- ##STR6## where R, R1 and R2 are alkyl of 1 to 10 carbon atoms or phenyl, R3 and R4 are hydrogen or alkyl of 1 to 10 carbon atoms;
Specification