Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for the preparation of 1,3-butadiene and styrene copolymers and use thereof in vulcanizable elastomeric compositions

A technology of styrene and copolymer, applied in the field of preparation 1, can solve problems such as poor compatibility and unsatisfactory performance

Active Publication Date: 2014-02-26
VERSALIS SPA
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the use of said couplers does not always bring about the desired results
In fact, the copolymers obtained can sometimes show unsatisfactory properties, for example due to poor compatibility of the copolymers with fillers, especially carbon black and / or silica, more specifically carbon black

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
  • Process for the preparation of 1,3-butadiene and styrene copolymers and use thereof in vulcanizable elastomeric compositions
  • Process for the preparation of 1,3-butadiene and styrene copolymers and use thereof in vulcanizable elastomeric compositions
  • Process for the preparation of 1,3-butadiene and styrene copolymers and use thereof in vulcanizable elastomeric compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 (comparison)

[0048] A dry mixture of 8000 g of cyclohexane / hexane (9 / 1 by weight, equal to a filling factor of 80%), 3.12 g of a polar modifier (tetrahydrofurfuryl ethyl ether-THFAethyl) (corresponding to 255 ppm , to the theoretical amount of initiator in a molar ratio of about 3:1) and then 300 g of styrene and 840 g of 1,3-butadiene were fed into a 16-liter stirred reactor. The resulting reaction mixture was heated to a temperature of 40°C by means of a heating jacket. Then, 0.51 g of n-butyllithium in n-hexane (3.41 g of a 15% by weight solution) were fed. The heating of the jacket was then removed, and due to the exothermic nature of the reaction, an increase in the temperature of the reaction mixture occurred until a final temperature of about 76°C (peak temperature). After waiting 10 minutes after reaching the peak temperature, 60 g of 1,3-butadiene (capped) were fed so that all active ends were of the butadienyl type. After waiting an addition...

Embodiment 2

[0049] Embodiment 2 (comparison)

[0050] In a stirred 16 liter reactor, the same procedure as for the feeding of the reagents described in Example 1 was carried out up to the introduction of the coupling agent, which in the case of this example was tin tetrachloride in an amount equal to 0.261 g , corresponding to a theoretical coupling efficiency of 50%. The remaining stages of the reaction are the same as those described in Example 1.

Embodiment 3

[0051] Embodiment 3 (comparison)

[0052] In a stirred 16 liter reactor, the same procedure as for the feeding of the reagents described in Example 1 was carried out until the coupling reaction with 0.261 g of tin tetrachloride was completed. After 5 minutes, 1.30 g of trioctyltin chloride was fed to deactivate the remaining active ends. After 10 minutes, the polymer solution was then drained into a tank where it was stabilized with 0.7 phr of 2,6-di-tert-butylphenol (BHT) and the entire solution was stripped with water to the desolvation section .

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

No PUM Login to View More

Abstract

A process for the preparation of a 1,3-butadiene and styrene copolymer comprising the following steps: a) anionically polymerizing a blend comprising from 5% by weight to 40% by weight of styrene and from 60% by weight to 95% by weight of 1,3-butadiene, with respect to the overall weight of the mixture, in the presence of at least one hydrocarbon solvent, of at least one lithium-based catalyst having the general formula LiR1 wherein R1 represents a linear or branched C3-C10 alkyl group, and of least one polar modifier; b) optionally, reacting the copolymer obtained in step (a) with at least one chain-end monomer selected from 1,3-butadiene, styrene and a-methylstyrene; c) reacting from 10% by weight to 70% by weight, preferably from 20% by weight to 50% by weight, of the lithium-terminated polymeric chains present in the copolymer obtained in step (a) or in step (b), with at least one coupling agent selected from liquid polyepoxides having at least three reactive sites capable of reacting with the carbon-lithium chain-ends; d) optionally, reacting the copolymer obtained in step (c) with at least one chain-end monomer selected from 1,3-butadiene, styrene and a-methylstyrene; e) reacting the linear polymeric chains remaining in the copolymer obtained in step (c) or in step (d), with at least one tin compound having the general formula XSn(R2)3 wherein X represents a halogen atom such as, for example, chlorine and R2 represents a linear or branched C1-C10 alkyl group.

Description

technical field [0001] The invention relates to a process for the preparation of copolymers of 1,3-butadiene and styrene and their use in vulcanizable elastomer compositions. [0002] More specifically, the present invention relates to a process for the preparation of copolymers of 1,3-butadiene and styrene comprising polymer-epoxide linkages and terminated with trialkyltins. [0003] Another object of the invention also concerns a vulcanizable elastomeric composition comprising at least one copolymer obtained with the above-mentioned process. [0004] In the present invention, all information provided and relating to operating and non-operating conditions should be considered to be preferred even if not expressly stated. Background technique [0005] Copolymers of 1,3-butadiene and styrene which are suitable for producing tires with low rolling resistance are known in the literature. For example, European patent EP754710B1 describes a process for the preparation of copoly...

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): C08C19/44C08F236/10
CPCC08F236/10C08C19/44C08F4/48C08C19/42
Inventor 卢卡·索多加布里尔·维尼瑞
Owner VERSALIS SPA