GB1344060A - Polymerisation of vinyl aromatic monomers - Google Patents

Polymerisation of vinyl aromatic monomers

Info

Publication number
GB1344060A
GB1344060A GB1344060DA GB1344060A GB 1344060 A GB1344060 A GB 1344060A GB 1344060D A GB1344060D A GB 1344060DA GB 1344060 A GB1344060 A GB 1344060A
Authority
GB
United Kingdom
Prior art keywords
monomer
stage
polymerization
maintain
added
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BP Chemicals Ltd
Original Assignee
BP Chemicals Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BP Chemicals Ltd filed Critical BP Chemicals Ltd
Publication of GB1344060A publication Critical patent/GB1344060A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium

Abstract

1344060 Suspension polymerizing vinyl aromatic monomers BP CHEMICALS Ltd 14 June 1971 [19 June 1970] 29796/70 Heading C3P A process for producing non-spherical polymer particles containing not more than about 20% by wt. of spherical particles comprises (1) suspending a vinyl aromatic monomer as an aqueous solution of sufficient hydroxyethyl cellulose to maintain a stable suspension until at least 40% of the monomer is polymerized, but insufficient to maintain a stable suspension until complete conversion, (2) polymerizing the stably suspended monomer to at least 40% but less than complete monomer conversion, (3) adding sufficient hydroxyethyl cellulose and/or water to maintain a stable suspension until complete monomer conversion and. (4) continuing the polymerization. The preferred monomer is styrene. Preferably 0À02 to 0À05% by wt. (based on the monomer) of hydroxyethyl cellulose is added in stage (1), and 0À05 to 1À0% by wt. (based on the monomer plus polymer) in stage (4). The weight ratio of monomer plus polymer throughout the polymerization is suitably from 1 : 2 to 2 : 1. The temperature is preferably kept below 100‹ C. during the first polymerization stage and raised above this in the second polymerization stage. Examples are given, in which the initiator is a mixture of benzoyl peroxide and t-butyl perbenzoate, and stearic acid is present. The particles produced are flattened spheres. In one example hydroxyethylcellulose is added in stage 3 and in the other example water is added.
GB1344060D 1970-06-19 1970-06-19 Polymerisation of vinyl aromatic monomers Expired GB1344060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2979670 1970-06-19

Publications (1)

Publication Number Publication Date
GB1344060A true GB1344060A (en) 1974-01-16

Family

ID=10297300

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1344060D Expired GB1344060A (en) 1970-06-19 1970-06-19 Polymerisation of vinyl aromatic monomers

Country Status (5)

Country Link
BE (1) BE768669A (en)
DE (1) DE2130375A1 (en)
FR (1) FR2099192A5 (en)
GB (1) GB1344060A (en)
NL (1) NL7108182A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189069A (en) * 1990-09-15 1993-02-23 Huels Aktiengesellschaft Process for controlling the particle size in the preparation of expandable styrene polymers by suspension polymerization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189069A (en) * 1990-09-15 1993-02-23 Huels Aktiengesellschaft Process for controlling the particle size in the preparation of expandable styrene polymers by suspension polymerization

Also Published As

Publication number Publication date
DE2130375A1 (en) 1971-12-23
BE768669A (en) 1971-12-17
NL7108182A (en) 1971-12-21
FR2099192A5 (en) 1972-03-10

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees