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Chloroprene block copolymer and soapless polychloroprene latex, and processes for production of copolymer and latex

A technology of block copolymer and polychloroprene, which is applied in the direction of adhesives, etc., can solve the problem that there is no record of the physical properties of block copolymers, and achieve the effect of improving adhesion and improving adhesion

Inactive Publication Date: 2008-09-10
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Patent Document 9 and Patent Document 10, it is described that various block copolymers can be produced by the reversible addition-fragmentation chain transfer (RAFT) polymerization method using dithiocarboxylates, but for chloroprene Polymerization of diene, synthesis of polychloroprene block copolymer, block ratio, and physical properties of the block copolymer are not described.

Method used

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  • Chloroprene block copolymer and soapless polychloroprene latex, and processes for production of copolymer and latex
  • Chloroprene block copolymer and soapless polychloroprene latex, and processes for production of copolymer and latex
  • Chloroprene block copolymer and soapless polychloroprene latex, and processes for production of copolymer and latex

Examples

Experimental program
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Effect test

Embodiment

[0115] In order to describe the present invention more specifically, Examples are shown below, but the present invention is not limited to these Examples.

[0116] First, reference examples, synthesis examples 1 to 15, examples 1 to 26, and comparative examples 1 to 5 are shown regarding the chloroprene-based block copolymer of the present invention. In addition, the values ​​in these examples were measured by the following methods.

[0117]

[0118] The conversion rate of the monomer during the polymerization was calculated using Shimadzu Gas Chromatography GC-17A (capillary column NEUTRABOND-5 manufactured by GL Science, hydrogen flame ionization detector), using benzene as an internal standard. .

[0119]

[0120] The number average molecular weight Mn, the weight average molecular weight Mw and the molecular weight distribution Mw / Mn of the polymer are measured under the following conditions using GPC8220 manufactured by Tosoh (Tosoh One) Co., Ltd. (eluent=tetrahydrof...

Synthetic example 1

[0142]Add 0.30 g of carbamate represented by the following general formula (7), 30.0 g of styrene, 4.0 g of acrylonitrile, and 20.0 g of methyl ethyl ketone into a 200 ml Pyrex heat-resistant glass (registered trademark) flask equipped with a nitrogen inlet tube , and then repeated freezing-degassing-melting 3 times, after fully degassing, stirring under a nitrogen atmosphere, and irradiating ultraviolet light (manufactured by Ushio Electric Co., Ltd., UM452( 450W)), while carrying out 20 hours of polymerization. The polymerization conversions of styrene and acrylonitrile at this time were 30% and 57%. The contents were poured into a large amount of methanol to precipitate a polystyrene / acrylonitrile copolymer to obtain a polymer (A). The number average molecular weight Mn measured by GPC was 14600, the weight average molecular weight Mw was 29100, and the molecular weight distribution Mw / Mn was 1.99. The sulfur content in the polymer was 0.66% by weight.

[0143] [chemical...

Synthetic example 2

[0146] Add 0.30 g of carbamate represented by general formula (7) and 0.14 g of carbamic acid disulfide represented by following general formula (8) in a 200 ml Pyrex heat-resistant glass (registered trademark) flask equipped with a nitrogen inlet tube. material, 30.0g styrene, 5.0g acrylonitrile, 20.0g methyl ethyl ketone, and then repeated freezing-degassing-melting three times, after fully degassing, stirring under nitrogen atmosphere, and from 80mm Polymerization was performed for 20 hours while irradiating ultraviolet rays (manufactured by Ushio Electric Co., Ltd., UM452 (450W)) at a distance of 20 Å. The polymerization conversions of styrene and acrylonitrile at this time were 29% and 56%. The contents were poured into a large amount of methanol to precipitate a polystyrene / acrylonitrile copolymer to obtain a polymer (A). The number average molecular weight Mn measured by GPC was 13100, the weight average molecular weight Mw was 25900, and the molecular weight distribut...

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Abstract

Disclosed are a novel polychloroprene copolymer, a soapless polychloroprene latex, and a process for producing the copolymer or latex in a simple manner, which are intended to be used for the improvement in adhesion property and water resistance of a conventional polychloroprene adhesive or the improvement in oil resistance and adhesion property of a conventional styrene-butadiene block copolymer. A chloroprene block copolymer comprising a polymer (A) having the composition represented by the general formula (1) in the description and a chloroprene polymer (B), the polymer (A) being linked to one terminal or both termini of the chloroprene polymer (B), and the total amount of the 1,2-bond and the isomerized 1,2-bond in the chloroprene polymer (B) as measured by carbon-13 nuclear magnetic resonance spectrometry being 2.0 mol% or less; a soapless polychloroprene latex comprising an amphiphilic chloroprene copolymer having a hydrophobic chloroprene polymer and a hydrophilic oligomer or polymer having an acidic functional group attached to the hydrophobic chloroprene polymer and 2 wt% or less of an emulsifying agent; and a process for producing the chloroprene block copolymer or soapless polychloroprene latex.

Description

technical field [0001] The present invention relates to a chloroprene-based block copolymer that has not been seen before, which has a polymer different from the chloroprene-based polymer connected to one or both ends of the chloroprene-based polymer; The emulsifier in the latex obtained by this block copolymer and the soap-free polychloroprene latex which remarkably improved adhesiveness and water resistance, and their manufacturing method. Background technique [0002] Adhesives and primers based on neoprene (also known as polychloroprene, hereinafter sometimes referred to as CR) are applications that make the most of the polarity, cohesion, and flexibility of CR. , as the mainstream of rubber adhesives, it is mainly used in a wide range of fields such as building materials, furniture, shoemaking, and vehicle manufacturing. [0003] However, conventional CR adhesives mainly have two problems. First, the adhesion to extremely polar materials such as vinyl chloride resins,...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08L53/00C08F2/38C09J153/00C08F289/00
Inventor 尾添真治
Owner TOSOH CORP
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