Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1994-02-17
1995-10-03
Sweet, Mark
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524812, 524816, 524832, C08L 4304
Patent
active
054552990
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to aqueous liquid for primers which is applied to improve surface of alkaline porous inorganic base materials such as concrete, mortar and the like.
BACKGROUND OF THE INVENTION
Because their surface layers are fragile, primers are usually applied on the surface of inorganic cement building materials such as concrete, mortar, slate and the like for the purpose of improving the surface reinforcement or adhesive strength to paints for surface finish and the like. Heretofore, solvent primer liquid formed by dissolving synthetic resin into organic solvent has been employed as such primers. However, the solvent primer liquid is easy to ignite because of its volatility and further it affects the human body when the fumes are breathed. Thus, the above solvent primer liquid has many problems from the viewpoints of safety, sanitation, and the like.
The present application has previously developed aqueous liquid for primers wherein water is medium and organic solvent is not employed as medium, and has already applied to the Japanese Patent Office (JPA 62-80694). And, also as a further developed version, he developed one liquid type primer, which is formed by copolymerizing dimethyl aminoalkylamide acrylate or epichlorohydrin adduct of dimethyl aminoalkylamide methacrylate as a function group and alkoxysilane element to be the aqueous resin superior in reinforcement effects of the surface layer of base materials by crosslinking irrespective of the alkaline degree of base materials and already filed an application.
Although the above aqueous liquid can form a coat superior in waterproof by crosslinking under both circumstances of acid and alkali, when the concentration of resin is raised, shelf stability deteriorates due to high viscosity. In addition, it has a defect that the permeability to inorganic building material, reinforcing ability to base materials and waterproof properties deteriorate due to a rise of viscosity.
OBJECT OF THE INVENTION
The object of the present invention is accordingly to provide aqueous liquid for primers superior in permeability and reinforcing ability to base materials and waterproof properties by forming resin liquid in high concentration and low viscosity without loss of crosslinking reaction.
SUMMARY OF THE INVENTION
In the first aspect, this invention relates to the aqueous liquid for primers, which contains a copolymer mainly formed with the following component (A), (B) and (C) in aqueous medium, where (A) is a cationic monomer represented as the following general formula (1) ##STR3## wherein Y is organic or inorganic monovalent anion; m is an integer 0 to 3 and n is an integer 1 to 3.
(B) is an alkoxysilane monomer represented as the following general formula (2) ##STR4##
(C) is an ethylenic unsaturated monomer; and wherein a structural unit derived from the (A) component accounts for not less than 5% (by weight; the same applies hereinafter) of the copolymer, a structural unit derived from the (B) component accounts for not less than 0.5% of the copolymer and a structural unit derived from the (C) component accounts for not more than 94.5% of the copolymer.
In addition, in the second aspect, the invention relates to the aqueous liquid for primers which contains dispersedly a polymer found by polymerizing ethylenic unsaturated monomer in the above aqueous liquid.
That is, the invention has performed a series of studies focused on water soluble resin, especially acrylic resin, to find an aqueous liquid for primers, which forms a strong coat having durability irrespective of types of base materials (inorganic building materials) and furthermore is superior in waterproof properties by forming high-concentrated and low viscous resin liquid. He found out that, as a result, when special monomers (component A and component B) represented as the above general formula (1) and (2), and an ethylenic unsaturated monomer (component C) are polymerized at a specific ratio, a chain polymer obtained shows a good solubility in water and f
REFERENCES:
patent: 4746552 (1988-05-01), Takumoto et al.
Dec Ellen T.
National Starch and Chemical Investment Holding Corporation
Sweet Mark
Szala Edwin M.
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