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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 temperatures with little energy absorption, i.e. no identifiable glass transition temperature

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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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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