Elastic methacrylate compositions

Abstract

A two-part adhesive composition exhibiting improved elasticity wherein its composition includes one or more acrylate or methacrylate ester monomers, a sulfur bearing compound, preferably a sulfonyl chloride, an amine promoter, preferably, an amine aldehyde reaction product, and a thermoplastic block copolymer component selected from the group consisting of a. a linear styrene-butadiene-styrene copolymer b. a radial styrene-butadiene-styrene block copolymer with a plasticizer, c. a linear or radial styrene-isoprene-styrene block copolymer, and d. a linear or radial styrene-butadiene-isoprene-styrene block copolymer, and mixtures thereof.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority from Provisional Application No. 60 / 752,713, filed on Dec. 21, 2005.FIELD OF INVENTION [0002] This invention relates to liquid and paste compositions comprising mixtures of polymers and acrylic or methacrylate monomers that are hardened by free radical polymerization to form high strength, flexibilized materials. The hardened compositions are generally useful as adhesives, filling and repair materials, coatings and the like. BACKGROUND OF THE INVENTION [0003] Commercial and prior art methacrylate adhesive compositions capable of being mixed in a 1:1 ratio and also having practical storage life or shelf life heretofore have not been as elastic or ductile as adhesives with the common but less practical 10:1 mix ratio. This is especially evident upon aging of the adhesive over time or at elevated temperatures. The latter compositions generally employ benzoyl peroxide as the primary initiating species. The ea...

AI Technical Summary

Benefits of technology

"This patent describes a two-part adhesive composition that has improved elasticity and retention of elasticity. The composition includes acrylate or methacrylate monomers and polymers, a sulfur bearing compound, an amine promoter, a thermoplastic block copolymer, and optionally an adhesion promoting polymer. The composition can be used as an ambient temperature curing adhesive and does not require the presence of benzoyl peroxide."

Problems solved by technology

Commercial and prior art methacrylate adhesive compositions capable of being mixed in a 1:1 ratio and also having practical storage life or shelf life heretofore have not been as elastic or ductile as adhesives with the common but less practical 10:1 mix ratio.

Benzoyl peroxide is not stable when mixed with methacrylate monomers.

While the hydroperoxide / sulfonyl chloride / DHP curing system has provided a means of producing adhesives with a convenient and non-critical 1:1 mix ratio, the resulting formulations have not been preferred for the most demanding structural adhesives applications.

This is because these formulations are typically more rigid and may become brittle upon aging relative to compositions cured with BPO and tertiary amines.

Polychloroprene, another chlorinated polymer used in prior art compositions, is also disclosed, which has undesirable effects.