Curable Composition

Abstract

Firstly, disclosed is a curable composition which includes an organic polymer containing a crosslinkable silyl group, an ultraviolet ray absorbing agent having a triazine skeleton and a hindered amine based light stabilizer, and thereby, exhibits improved weather resistance both in a thin layer portion and in a thick layer portion. Secondly, disclosed is a curable composition which includes an organic polymer containing a crosslinkable silyl group, a (meth)acrylic polymer containing an epoxy group, a divalent tin organic carboxylate and an organic amine compound, and thereby, exhibits excellent weather resistance, anti-staining property, restoring property and durability. Thirdly, disclosed are an excellent curable composition which includes a reactive organic polymer containing at least one crosslinkable silyl group in one molecule thereof, a reactive organic polymer containing less than one crosslinkable silyl group in one molecule thereof, and thermally expandable hollow spheres as essential components, and thereby, exhibits economical productivity, good physical properties, safety and fire resistance; and a sealing material produced from the curable composition. Further, disclosed is a method for forming a fire-resistant structure with ease and at a low cost.

Description

TECHNICAL FIELD[0001]The present invention firstly relates to a curable composition excellent in weather resistance, and a sealing material using the curable composition as an available ingredient and excellent in weather resistance. The present invention secondly relates to a curable composition excellent in restoring property, durability, weather resistance, and paint anti-staining property, and a sealing material using the curable composition as an available ingredient. The present invention thirdly relates to a curable composition excellent in fire resistance, a sealing material using the curable composition as an available ingredient and having fire resistance, and a method of forming a fire-resistant structure involving the use of the sealing material.BACKGROUND ART[0002]A sealing material has been conventionally blended with a stabilizer in order that weather resistance may be imparted to the material. However, irrespective of the above fact, such whitening problems as descri...

AI Technical Summary

Benefits of technology

[0024]A first object of the present invention is to provide a curable composition and a sealing material each having improved weather resistance in each of a thin layer portion and a thick layer portion. A second object of the present invention is to provide a curable composition and a sealing material each of which are excellent in weather resistance, paint anti-staining property, restoring property, and durability. A third object of the present invention is to provide an excellent curable composition and an excellent sealing material each having economical productivity, good physical properties, safety, and fire resistance. Another object of the present invention is to provide a method of forming a fire-resistant structure with ease at a low cost.Means for solving the Problems

Problems solved by technology

However, irrespective of the above fact, such whitening problems as described below occur, and have been serious problems to be solved in the field of sealing material construction.

When a masking tape is stuck on a portion apart from a joint of an adherend due to an error in construction at the time of the placement of the sealing material, thin layer parts are formed after spatulation for flattening the surface of the sealing material at a joint portion, and the thin layer parts each deteriorate to whiten more quickly than the sealing material at the joint portion, with the result that the appearance of a structure becomes poor, and the design of the structure becomes extremely bad.

At present, there is no technology for solving the whitening phenomenon of those thin layer parts (hereinafter collectively referred to as “thin layer portion”).

Those stabilizers are effective for, for example, sealing materials at thick (for example, 5 mm or more in thickness) joint portions (hereinafter collectively referred to as “thick layer portion”), but none of those stabilizers is effective for the thin layer portion, and no stabilizer formulation capable of improving the weather resistance of the thin layer portion and that of the thick layer portion simultaneously is known.

However, it cannot yet be said that the weather resistance is sufficient.

However, the physical properties of the composition such as weather resistance and paint anti-staining property have been poor.

However, none of the sealing materials each containing a polyphosphate compound can obtain predetermined fire resistance unless the loading of the polyphosphate compound is equal to or higher than a certain level.

Moreover, blending each of the sealing materials with the polyphosphate compound involves the following problems: reductions in physical properties of each of the sealing materials and an increase in cost for the production of each of the sealing materials.

However, the vinyl based organic polymer is inherently poor in elongation property.

In addition, blending the vinyl based organic polymer with the foaming agent involves the following problem: additional reductions in the physical properties of the polymer.

However, such method must be executed by an expert in order that fire resistance may not vary from place to place, and requires the following complicated operation: the body must be cut to be adjusted to be a joint shape that varies from place to place.

As a result, the method is extremely costly.

However, the material involves the following problems: the material is poor in coating property, and causes water-repellent staining.

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