Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing polybutadiene

A technology of polybutadiene and manufacturing method, which is applied in the directions of conjugated diene adhesive, photoengraving process of pattern surface, adhesive type, etc., can solve problems such as unpredictability and reduction, and improve utilization value Effect

Active Publication Date: 2012-07-04
NIPPON SODA CO LTD
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as the reaction temperature decreases, 1,2-bonds increase, so it is not expected that 1,3-butadiene can be increased by adding a tert-butoxy alkali metal salt at a low temperature below the boiling point of 1,3-butadiene (-4.4°C). , 4-structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing polybutadiene
  • Method for producing polybutadiene
  • Method for producing polybutadiene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] 212 g of n-hexane was placed in a 1 L flask, and cooled to -40°C. Add 23g of n-butyllithium n-hexane solution (concentration is 15.4% by mass), then add 48g of THF solution of tert-butoxide potassium (concentration of tert-butoxide potassium is 12.4% by mass, the amount added is the same as that of n-butyl Lithium equimolar), stirred at -40°C for 30 minutes. 14 g of butadiene liquefied at -78°C was added dropwise thereto, followed by stirring at -20°C for 1 hour. Further, 35 g of liquefied butadiene was added dropwise, followed by stirring at -20°C for 1 hour. Then 17 g of methanol were added.

[0115] This solution was washed twice with 200 g of pure water, three times with 200 g of 0.2% hydrochloric acid, further diluted with 180 g of toluene, and then washed four times with 300 g of pure water. The organic layer was concentrated and the solvent was distilled off to obtain 48 g of liquid resin.

[0116] The physical property values ​​of the obtained resin are as f...

Embodiment 2

[0121] 278 g of THF was placed in a 1 L flask, and 2.7 g of a sodium dispersion (kerosene dispersion of metal sodium, concentration 43.7%) was added at room temperature, followed by cooling to -40°C. Next, 44 g of a THF solution of potassium tert-butoxide (the concentration of potassium tert-butoxide is 12.4% by mass, and the amount added is equimolar to sodium) was added, followed by stirring at -40° C. for 30 minutes. Continue to add 7 g of liquefied butadiene. After stirring at -20° C. for 1 hour, 42 g of liquefied butadiene were added. After further stirring at -20°C for 2 hours, 16 g of methanol was added.

[0122] This solution was poured into 1480 g of methanol, the supernatant liquid was removed by decantation, and the syrupy precipitate was dissolved in 162 g of toluene. This solution was washed once with 150 g of pure water, once with 150 g of 0.2% hydrochloric acid, and then three times with 300 g of pure water. The organic layer was concentrated and the solvent ...

Embodiment 3

[0127]196 g of THF was placed in a 1 L flask, and cooled to -40°C. Add 23g of n-butyllithium n-hexane solution (concentration is 15.4% by mass), then add 91g of THF solution of tert-butoxide potassium (concentration of tert-butoxide potassium is 12.4% by mass, the addition amount is n-butyl 2 times moles of lithium), stirred at -40°C for 30 minutes. 14 g of butadiene liquefied at -78°C was added dropwise thereto, followed by stirring at -20°C for 30 minutes. Further, 35 g of liquefied butadiene was added dropwise, followed by stirring at -20°C for 1 hour. Then 17 g of methanol were added.

[0128] This solution was washed once with 300 g of pure water, once with 200 g of 0.1% hydrochloric acid, and twice with 200 g of pure water. The organic layer was concentrated and the solvent was distilled off, and diluted with 90 g of THF. This solution was poured into 840 g of methanol, the supernatant liquid was removed by decantation, and the syrupy precipitate was dissolved with 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Hydroxyl valueaaaaaaaaaa
Hydroxyl valueaaaaaaaaaa
Login to View More

Abstract

In the disclosed method for producing polybutadiene by means of anionic polymerization at a low temperature, polybutadiene having diverse physical properties is produced by means of controlling the microstructure thereof. The method for producing polybutadiene by means of anionic polymerization from 1,3-butadiene under the presence of a polymerization initiator and under reaction temperature conditions no higher than the boiling point of butadiene is characterized by being performed under the presence of a potassium salt in an aprotic polar solvent or a mixed solvent of an aprotic polar solvent and a nonpolar solvent. The potassium salt is preferably potassium t-butoxide, and the solvent is preferably a mixed solvent of tetrahydrofuran and hexane. The polybutadiene obtained thereby can be used in an adhesive composition and in a plate production material composition used in flexographic printing plates.

Description

technical field [0001] The present invention relates to an anionic polymerization method of polybutadiene capable of controlling the ratio of 1,4-structure and 1,2-structure, and a photosensitive elastomer composition for flexographic printing containing polybutadiene obtained by the method . Furthermore, it is related with the adhesive composition containing the terminal acryl-modified polybutadiene derived from the said polybutadiene. [0002] this application claims priority to Japanese Patent Application No. 2009-237675 for which it applied on October 14, 2009, and uses the content here. Background technique [0003] Polybutadiene has 1,2-structure, cis-1,4-structure, and trans-1,4-structure, and the physical properties of polybutadiene vary greatly depending on their ratio, that is, the ratio of microstructure. Therefore, the user's request is also diverse, and a method capable of easily controlling the ratio of the microstructure is desired in order to provide a prod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08F2/44G03F7/032G03F7/00C08F4/46C08L53/02C08K9/00
CPCG03F7/033C08F36/04C08L9/00C08L53/02C08F4/48C08F2/00C08F36/06C09J109/00
Inventor 白井昭宏宫下康典霜鸟武司
Owner NIPPON SODA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com