Modified vinyl acetal resin for laminated glass interlayer film

A technology of vinyl acetal resin and laminated glass, which is applied in the direction of glass/slag layered products, layered products, transportation and packaging, etc. It can solve the problems of slow cooling speed, reduced transparency, poor bonding, etc., and achieve durability Excellent impact strength, good balance, and excellent heat resistance

Pending Publication Date: 2021-11-12
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, if the temperature conditions of the ionomer resin during molding are not strictly adjusted, whitening or poor adhesion will easily occur, especially when the cooling rate after melt molding is reduced, there is a problem of easy whitening
For example, when cooling a laminated glass sandwiching a plate-shaped molded body of ionomer resin, whitening occurs in the central part where the cooling rate is slow, and the transparency decreases.
In this way, for laminated glass using ionomer resin, the control of manufacturing conditions is strict, the manufacturing cost is high, and industrial mass production is difficult.

Method used

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  • Modified vinyl acetal resin for laminated glass interlayer film
  • Modified vinyl acetal resin for laminated glass interlayer film
  • Modified vinyl acetal resin for laminated glass interlayer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] (Synthesis of modified vinyl acetal resin)

[0120] Disperse 100 parts by weight of an ethylene vinyl alcohol copolymer sheet of 44 mol% ethylene units, saponification degree 99%, MFR 5.5g / 10min, synthesized by the method described in JP 2016-28139, in 315 parts by weight of 1-propylene In the alcohol, the temperature of the solution was raised to 60° C. with stirring, 40 parts by weight of 1M hydrochloric acid was added, and 16.7 parts by weight of n-butyraldehyde was added and dispersed, followed by acetalization reaction while maintaining 60° C. As the reaction progressed, the flakes dissolved to form a homogeneous solution. When the reaction was started for 36 hours, 6.4 parts by weight of sodium bicarbonate was added to stop the reaction. After adding 500 parts by weight of 1-propanol to the reaction liquid to make it uniform, it was added dropwise to 2000 parts by weight of water to deposit a resin. Thereafter, the operation of filtering and washing with water w...

Embodiment 2～6

[0124] Each modified vinyl acetal was obtained in the same manner as in Example 1, except that the ethylene unit, MFR, the addition amount of n-butyraldehyde, and the reaction time of the ethylene vinyl alcohol copolymer used were changed to those shown in Table 1. The resin was melt-kneaded in the same manner as in Example 1 to obtain a melt-kneaded product. Various physical property evaluations were performed using the obtained melt-kneaded product. The results are shown in Table 1.

Embodiment 7

[0126] Each modified vinyl acetal resin was obtained in the same manner as in Example 2, and triethylene glycol-di-2-ethylhexanoic acid was added as a plasticizer to 100 parts by weight of the modified vinyl acetal resin A melt-kneaded product was obtained in the same manner as in Example 1 except that the ester was 8 parts by weight. Various physical property evaluations were performed using the obtained melt-kneaded product. The results are shown in Table 1.

[0127] [Table 1]

[0128]

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PUM

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Abstract

The present invention addresses the problem of providing a modified vinyl acetal resin for a laminated glass interlayer film, having excellent transparency, impact resistance, heat resistance, and moldability. The problem of the present invention is solved by a modified vinyl acetal resin for a laminated glass interlayer film, including 25-60 mol% of ethylene units and 24-71 mol% of vinyl alcohol units based on the total of monomer units constituting the resin, and having a degree of acetalization of 5 mol% to less than 40 mol%.

Description

technical field [0001] The present invention relates to a modified vinyl acetal resin for an interlayer film of laminated glass, and more specifically, to a modified vinyl alcohol for an interlayer film of laminated glass having excellent transparency, impact resistance, heat resistance, and formability Acetal resin. Background technique [0002] Even if laminated glass is damaged by external impact, there are few glass fragments scattered and it is safe. Therefore, it is widely used as front windshield, side window glass, rear glass of automobiles and other vehicles, and window glass of aircraft and buildings. Wait. [0003] In recent years, there has been an increasing demand for performance improvement of laminated glass. In particular, when laminated glass is used for structural purposes (main facades) of buildings, for example, it is required that the glass does not penetrate or sag even in a broken state under high temperature conditions (self-supporting property). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C27/12B32B17/10C08F210/02C08F216/38C08J5/18C08F8/28C08L29/14
CPCC08F8/28C08F216/38C08J5/18C08F216/06C08K5/103B32B17/10036B32B17/10761C08J2329/04C08J2329/14C08F210/02C08L29/04C08L29/14C08L23/0861B32B17/10B32B2250/03B32B2307/306B32B2307/412B32B2307/558B32B2605/006
Inventor 新村卓郎高杉晃央中原淳裕浅沼芳聪
Owner KURARAY CO LTD
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