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Curable adhesive compsn.

A composition and compound technology, applied in adhesives, other chemical processes, chemical instruments and methods, etc., can solve problems such as poor adhesion of coatings, stained areas, and increased viscosity of polymers

Inactive Publication Date: 2000-08-30
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the polysiloxane-based sealing material is not only excellent in weather resistance, but also excellent in various aspects such as non-movement and processability under cold conditions, it is pointed out that there are still defects such as poor adhesion of paint, and will Contaminate the area near the connection point
Another problem is the increased viscosity of the polymer due to the broadened molecular weight distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0173] The cross-linkable silyl-terminated polymer (100 parts by weight) synthesized in Synthesis Example 1 was mixed with 1 part by weight of dibutyltin diacetylacetonate, and the mixture was poured into a mold , Use a vacuum dryer to degas at room temperature. After heating at 50°C for 20 hours to cure, a uniform rubber-like cured sheet was obtained. The gel fraction determined by toluene extraction was 93%.

[0174] A dumbbell-shaped test sample No. 2 (1 / 3) was punched out from a rubber-like cured sheet, and the strength was tested with an automatic recorder (200 mm / min). The breaking strength is 0.31 MPa, and the breaking elongation is 35%.

[0175] Synthesis Example 2

[0176] Synthesis of poly(n-butyl acrylate) terminated with alkenyl groups

[0177] In a nitrogen atmosphere, to a toluene solution (100 ml) containing the hydroxyl-terminated poly(n-butyl acrylate) (50 g) and pyridine (10 ml) obtained in Synthesis Example 1 at 75°C, slowly Undecylenyl chloride (7.22 ml, 6.81 g,...

Embodiment 2

[0181] The crosslinkable silyl group-terminated polymer (1 g) obtained in Synthesis Example 2 was combined with a curing catalyst [U-220 (trademark), Nitto Kasei's product, dibutyltin diacetylacetonate, 30 mg] was mixed, the mixture was poured into a mold, degassed at room temperature using a vacuum dryer, and allowed to stand at room temperature for 7 days to obtain a uniform rubber-like cured product. The gel fraction is 78%.

Embodiment 3

[0183] The crosslinkable silyl group-terminated polymer (100 parts by weight) of Synthesis Example 2 was mixed with 1 part by weight of water and 1 part by weight of dibutyltin dimethoxide, and the mixture was poured Into the mold, use a vacuum dryer to degas at room temperature. Then it was heated at 50°C for 20 hours to cure, giving a uniform rubber-like cured sheet. The gel fraction measured by toluene extraction was 88%.

[0184] A dumbbell-shaped test sample No. 2 (1 / 3) was punched out from a rubber-like cured sheet, and the strength was tested with an automatic recorder (200 mm / min). The breaking strength is 0.32 MPa, and the breaking elongation is 34%.

[0185] Synthesis Example 3

[0186] Synthesis of halogen-terminated poly(n-butyl acrylate)

[0187] A 500 ml pressure reaction vessel contains n-butyl acrylate (112 ml, 100 g, 0.78 mol), dibromo xylene (4.12 g, 15.6 mmol), cuprous bromide (2.24 g, 15.6 mmol), 2. 2'-Bipyridine (4.87 g, 31.2 mmol), ethyl acetate (90 mL) and a...

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Abstract

An adhesive curable composition which comprises, as the main component, a vinyl polymer having at least one crosslinkable silyl group represented by the general formula (1). Said composition can be used as a sealing composition, a pressure sensitive adhesive composition and a coating composition. -ÄSi(R<1>)2-b(Y)bOÜm-Si(R<2>)3-a(Y)a wherein R<1> and R<2> are the same or different and each represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms or a triorganosiloxy group represented by the formula (R')3SiO- (in which R' represents a monovalent hydrocarbon group containing 1 to 20 carbon atoms and the various R' groups may be the same or different) and, when there are two or more R<1> or R<2> groups, they may be the same or different; Y represents a hydroxyl group or a hydrolyzable group and, when there are two or more Y groups, they may be the same or different; a represents 0, 1, 2 or 3; b represents 0, 1 or 2; and m represents an integer of 0 to 19; with the condition that a, b and m satisfy the relation a + mb ≥ 1.

Description

Technical field [0001] The present invention relates to a curable composition having adhesiveness or tack, that is, a curable adhesive composition. More specifically, it relates to a sealing composition, which exhibits excellent weather resistance and heat resistance, has excellent processing properties due to its low viscosity, can be packaged into a single container, and exhibits excellent coating properties; It also relates to a coating composition or adhesive composition, which has excellent weather resistance and heat resistance. Due to the low intrinsic viscosity of the composition, it can significantly reduce its internal solvent content (to obtain a high solid content), so it Less impediment to the environment. Background of the invention [0002] In the construction field, polysiloxane-based sealing materials with silicon-containing groups have been widely used as sealing materials with excellent weather resistance and heat resistance. The materials have hydroxyl groups ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/42C09D183/04C09J143/04C09K3/10
CPCC08F8/42C09K3/1018C09D183/04Y10S524/904C09J143/04
Inventor 藤田雅幸北野健一日下部正人
Owner KANEKA CORP
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