Wet-to-cure acrylate adhesive

Curable polyacrylate polymers containing organosilane monomers that can be polymerized by free radicals and have hydrolyzed groups bonded to silicon atoms are well known and have been used as polymer viscosifiers and base coatings. After curing, however, these known polyacrylate-organosilane compositions are generally ductile, often brittle materials and such materials are not suitable for use in joint sealing where elastic properties are required. Examples of such compositions have been published in the US.PatentN0.3453136, 3951893, 4026826, and 4093673.

Plueddemann has filed a patent filing under USPatent No3453230 covering “sealants, coatings and molding compounds with potential industrial applications…” Acrylic ester – organosilicon composition. More specifically, a vinyl or acrylate unit consisting primarily of 100-mole parts is disclosed; 1-8 molars (methyl) acyloxy alkyl silanes or vinylsilanes; Copolymers of up to 50 molar parts from optional vinyl monomers of ethylene, vinyl chloride, vinylidene, vinyl acetate, styrene, acrylonitrile and butadiene, and 0.5 to 4 molar parts of hydrophobic silane or ethynodiol chain transfer agent. The sealant made from acrylate-silicone copolymer disclosed by the Plueddemann patent is unsuitable for use in highly mobile sealant formulations due to poor cohesion and elongation properties

The known acrylate-silicone copolymers are not suitable for use in the formulation of highly mobile sealants, such as the sealing of structural joints between building materials with different thermal expansion coefficients. At the same time, various suitable alternatives such as epoxy resin or polyurethane-based formulations have been available, thus reducing the rate of interest in high-performance acrylate-silicone copolymer-based sealants with high mobility. Thus, although the potential industrial utility of these copolymers in sealant formulations was recognized as early as 1964, acrylic copolymers containing reactive salicyl groups that can be used in high-mobility sealant formulations and have excellent elongation, elastic recovery, and weather resistance after curing have not been made public.