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Acrylic elastomer and its composition

a technology of elastomer and elastomer, which is applied in the field ofacrylic elastomer, can solve the problems of no satisfactory compression set characteristics, and large amount of remaining unreacted monomers, and achieve good compression set characteristics and distinguishable vulcanization characteristics

Inactive Publication Date: 2001-06-28
NIPPON MEKTRON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide an acrylic elastomer capable of giving cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics and a composition thereof.

Problems solved by technology

However, vulcanization characteristics and compression set characteristics of such a rubbery material are much fluctuated and neither satisfactory compression set characteristics nor satisfactory vulcanization characteristics can be obtained, depending upon cases.
For example, in case of maleic acid monoalkyl ester the esters undergo copolymerization only in such an amount as 1 / 3-1 / 4 times the necessary one for cross-linking site formation, and thus must be charged in an increased amount, resulting in a large amount of remaining unreacted monomers.

Method used

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  • Acrylic elastomer and its composition

Examples

Experimental program
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Effect test

reference examples 1 to 9

[0045] The following components were charged into a separable flask provided with a thermometer, a stirrer, a nitrogen gas inlet pipe and an evacuation apparatus:

1 Parts by weight Water 150 Sodium laurylsulfate 5.5 Monomer mixture given in Table 1 100

[0046] Then, the flask was subjected to repetitious of air removal and nitrogen gas flushing to thoroughly remove oxygen from the flask, and the following components were added thereto to initiate polymerization reaction at room temperature, and the reaction was continued until the polymerization conversion reached at least 90%:

2 Parts by weight Sodium formaldehyde sulfoxylate 0.002 t-Butyl hydroperoxide 0.005

[0047] The resulting aqueous latex was solidified in an aqueous sodium chloride solution, followed by water washing and drying to obtain monoalkyl maleate-copolymerized acrylic elastomer. Proportion (mol. %) of unreacted monoalkyl maleate to monoalkyl maleate copolymerized in the resulting copolymer was adjusted by controlling an a...

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Abstract

A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

Description

BACKGROUND OF THE INVENTION[0001] 1. Field of the Invention[0002] The present invention relates to an acrylic elastomer and its composition and more particularly to an acrylic elastomer capable of giving stable compression set characteristics and its composition.[0003] 2. Related Art[0004] Carboxyl group-containing acrylic elastomers, particularly acrylic elastomers in which the carboxyl groups of butenedioic acid monoalkyl ester act as cross-linking sites, are characterized by giving a cross-linking products with a distinguished compression set, free from any fear of corrosion of metal due to their non-halogenic properties per se by cross-linking reaction with a polyamine compound.[0005] Such a rubbery material has good steam vulcanization characteristics and is effectively used in the field of strict requirements for compression set characteristics such as the field of sealing materials such as gaskets, oil seals, O-rings, etc. (JP-A-11-140264 and 11-269336) or the field of hose m...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L33/08C08F220/12C08F222/10C08G18/62
CPCC08F220/12
Inventor MORIYAMA, IWAOOKABE, JUN
Owner NIPPON MEKTRON LTD
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