PROCESS FOR PREPARING MALEIC ANHYDRIDE-GRAFTED STYRENE-BUTADIENE BLOCK COPOLYMERS

PROCESS FOR PREPARING MALEIC ANHYDRIDE-GRAFTED STYRENE-BUTADIENE BLOCK COPOLYMERS

The invention relates to a process for preparing maleic anhydride-grafted styrene-butadiene block copolymers to be employed as modifiers for crystalline polymers. According to the invention, the process consists in that the maleinization reaction takes place in solution, the reaction medium being an...

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Hauptverfasser: GHIOCA PAUL -NICULAE, STEPAN EMIL, VELEA SANDA, VULUGA ZINA, IANCU LORENA, SPURCACIU BOGDAN NOROCEL
Format: Patent
Sprache:eng ; rum
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CHEMISTRY
COMPOSITIONS BASED THEREON
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
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creator GHIOCA PAUL -NICULAE
STEPAN EMIL
VELEA SANDA
VULUGA ZINA
IANCU LORENA
SPURCACIU BOGDAN NOROCEL
description The invention relates to a process for preparing maleic anhydride-grafted styrene-butadiene block copolymers to be employed as modifiers for crystalline polymers. According to the invention, the process consists in that the maleinization reaction takes place in solution, the reaction medium being an ecologically friendly solvent consisting of a mixture of fatty acid methyl esters with 10% butyl acetate, the reaction being performed at a temperature of 75°C for 6 h, at a maleic anhydride/styrene-butadiene block copolymer ratio of 0.075...0.109 and a 2,2'.azo-bis-isobutyronitrile/styrene-butadiene block copolymer ratio of 0.010...0.027. Invenţia se referă la un procedeu de obţinere a unor bloc-copolimeri stiren butadienici grefaţi cu anhidridă maleică, utilizaţi ca modificatori ai polimerilor cristalini. Procedeul conform invenţiei constă din aceea că reacţia de maleinizare are loc în soluţie utilizând, ca mediu de reacţie, un solvent ecologic constituit dintr-un amestec de esteri metilici ai acizilor graşi cu 10% acetat de butil, reacţia având loc la o temperatură de 75°C, timp de 6 h, la un raport anhidridă maleică/bloc-copolimer stiren butadienic de 0,075...0,109 şi la un raport 2,2'-azo-bis-izobutironitril/bloc-copolimer stiren butadienic de 0,010...0,027.
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subjects CHEMISTRY
COMPOSITIONS BASED THEREON
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
title PROCESS FOR PREPARING MALEIC ANHYDRIDE-GRAFTED STYRENE-BUTADIENE BLOCK COPOLYMERS
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