Styrene-butadiene polymers with styrene gradient and methods of making same

A technology of polymer and butadiene, applied in the field of styrene-butadiene polymer with styrene gradient and its preparation, can solve the problems of small glass transition temperature, no glass transition temperature and the like

Inactive Publication Date: 2011-08-17
TRINSEO EURO GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method produces polymers and copolymers with multiple glass transition temperatu

Method used

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  • Styrene-butadiene polymers with styrene gradient and methods of making same
  • Styrene-butadiene polymers with styrene gradient and methods of making same
  • Styrene-butadiene polymers with styrene gradient and methods of making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] Example 1 (TT17)

[0126] Cyclohexane (m CH，0 =4980g), butadiene (m BD，0 =245.51g), styrene (m St，0 =510.92g) and tetramethylethylenediamine (TMEDA (2.86 mmol respm TMEDA，0 = 13.6 g of a solution in cyclohexane)) was charged to a 10-liter reactor under a nitrogen atmosphere, and the mixture was heated to 55° C. while stirring. Secondly, 4.704 mmoles of n-butyllithium (in cyclohexane m NBL，T = 12.69 g of solution) was added dropwise to the mixture (reaction with impurities) until the color of the reaction mixture changed to yellow (titration step). Then, 6.487 millimoles of n-butyllithium (solution in cyclohexane: m NBL，P = 17.5 g) was charged immediately by pump to initiate polymerization. The charge start time of "6.487 mmoles of n-butyllithium" was used as the start time of the initial polymerization reaction.

[0127] The initial polymerization step was characterized as a typical batch polymerization without any additional reactants charged. Starting after "6...

Embodiment 2

[0131] Example 2 (TT18)

[0132] Example 1 was repeated with the following changes: TMEDA (5.179 mmol) was used in the initial charge.

Embodiment 3

[0133] Example 3 (TT15)

[0134] Example 1 was repeated with the following changes: instead of 2.86 mmoles of TMEDA, "4.59 mmoles of TMEDA" was included in the initial charge.

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PUM

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Abstract

The invention provides a process for polymerizing a polymer comprising monomeric units derived from styrene and 1,3-butadiene, said process comprising: A) adding less than 60 weight percent of the total amount of the butadiene used in the polymerization, to a reactor comprising the total amount of styrene used in the polymerization and solvent; B) adding at least one initiator to the reactor, and allowing the reaction to proceed for a time t; and C) adding the remaining amount of butadiene to the reactor in two or more separate additions; and wherein for each butadiene addition, the amount of subsequent butadiene added is less than, or equal to, the amount of butadiene added in the immediately prior addition; and wherein for each butadiene addition, the butadiene is added over a time, tnc, and after each addition, the reaction is allowed to proceed for a time, tnr, wherein n is the number of the butadiene addition, and for each addition, n is independently greater than, or equal to, 1.

Description

technical field [0001] A high styrene rubber (SSBR) having a specific structure and a method of producing the rubber have been disclosed. This specific structure is characterized by a specific styrene gradient across the polymer chains, including a lower styrene content at the ends of the two chains and a higher styrene content towards the middle of the polymer chain. Background technique [0002] The GB994726 patent specification discloses linear copolymers derived from (A) at least one diene consisting of 1,3-butadiene or isoprene, and (B) at least one vinyl-substituted Aromatic compounds. The diene and aromatic compound are randomly distributed in a copolymer having a diene content characterized by (1) at least 30% cis-1,4 structure and no more than 12% 1,2 structure , wherein the diene is butadiene or piperylene, or (2) at least 70% cis-1,4 structure, and not more than 15% 3,4 structure, and substantially no 1,2 structure content, And wherein the diene is isoprene. T...

Claims

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Application Information

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IPC IPC(8): C08F36/06C08F297/04C08L53/02
CPCC08L15/00C08F236/10C08C19/44C08F297/04C08F2/001C08F12/08C08F36/06C08F236/04C08L9/06
Inventor E·哈曼H·巴托塞克
Owner TRINSEO EURO GMBH
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