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公开(公告)号：US3758425A
公开(公告)日：1973-09-11
申请号：US3758425D
申请日：1971-11-15
Applicant: HOECHST AG
IPC: C08F271/00 , C08F283/12 , C08J9/20 , C08F47/10 , C08J1/26
CPC classification number: C08J9/20 , C08F271/00 , C08F283/124 , Y10S526/91 , C08F212/08 , C08F212/02
Abstract: A PROCESS FOR PREPARING FOAMABLE STYRENE POLYMER BEADS CONTAINING BLOWING AGENTS WITH A PARTICULARLY FAVOURABLE, NARROW GRAIN SIZE DISTRIBUTION. THIS NOVEL PROCESS COMPRISES THE USE OF COPOLYMERS OF N-VINYL-N-ALKYL ACETAMIDE HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP WITH AN ESTER OF ACRYLIC, METHACRYLIC, MALEIC OF FUMARIC ACID WITH AN ALIPHATIC ALCOHOL HAVING A LINEAR OR BRANCHED CHAIN AND CONTAINING FROM 6 TO 18 CARBON ATOMS, AS PROTECTIVE COLLOID IN THE HOMO- OR COPOLYMERIZATION OF STYRENE IN AN AQUEOUS SUSPENSION IN THE PRESENCE OF A BLOWING AGENT.
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公开(公告)号：DK141584B
公开(公告)日：1980-04-28
申请号：DK366676
申请日：1976-08-13
Applicant: HOECHST AG
IPC: C08F4/00 , C08F2/16 , C08F4/28 , C08F255/00 , C08F255/04 , C08F255/06
Abstract: There is disclosed an improved bulk-suspension process for polymerizing vinyl aromatic monomers in the presence of an ethylene-propylene-nonconjugated diene-rubber, which comprises using, in the suspension polymerization step, peroxy-carbonic esters as the polymerization initiator. The process of the invention yields products having improved notched impact strength, weatherability and elongation at break combined with a good shear stability.
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公开(公告)号：BR7704144A
公开(公告)日：1978-04-25
申请号：BR7704144
申请日：1977-06-24
Applicant: HOECHST AG
IPC: C08F2/00 , C08F2/18 , C08F2/20 , C08F2/44 , C08F12/00 , C08F285/00 , C08F291/02 , C08F279/02
Abstract: There is described an improved process for the discontinuous suspension polymerization of alkenyl-aromatic compounds, which comprises re-using the aqueous polymerization medium, after separation of the polymer beads, as the polymerization medium of a subsequent polymerization. Monomer-soluble and water-soluble initiators and, optionally fresh water and dispersing agent, are added. Re-using the aqueous polymerization medium does not negatively affect the color and mechanical properties of the polymer obtained. The process of the invention results in considerable saving of energy.
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公开(公告)号：DK141584C
公开(公告)日：1980-10-06
申请号：DK366676
申请日：1976-08-13
Applicant: HOECHST AG
IPC: C08F4/00 , C08F2/16 , C08F4/28 , C08F255/00 , C08F255/04 , C08F255/06
Abstract: There is disclosed an improved bulk-suspension process for polymerizing vinyl aromatic monomers in the presence of an ethylene-propylene-nonconjugated diene-rubber, which comprises using, in the suspension polymerization step, peroxy-carbonic esters as the polymerization initiator. The process of the invention yields products having improved notched impact strength, weatherability and elongation at break combined with a good shear stability.
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公开(公告)号：SE7707256L
公开(公告)日：1977-12-27
申请号：SE7707256
申请日：1977-06-22
Applicant: HOECHST AG
Inventor： LEDERER M , BOUMAN A J M
IPC: C08F2/00 , C08F2/18 , C08F2/20 , C08F2/44 , C08F12/00 , C08F285/00 , C08F291/02 , C08F12/02
Abstract: There is described an improved process for the discontinuous suspension polymerization of alkenyl-aromatic compounds, which comprises re-using the aqueous polymerization medium, after separation of the polymer beads, as the polymerization medium of a subsequent polymerization. Monomer-soluble and water-soluble initiators and, optionally fresh water and dispersing agent, are added. Re-using the aqueous polymerization medium does not negatively affect the color and mechanical properties of the polymer obtained. The process of the invention results in considerable saving of energy.
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Patent Agency Ranking
公开(公告)号：DK91275A
公开(公告)日：1975-09-08
申请号：DK91275
申请日：1975-03-06
Applicant: HOECHST AG
IPC: C08F255/00 , C08F255/04 , C08F255/06 , C08F283/12 , C08F291/00 , C08F
Abstract: The invention relates to novel impact resistant graft copolymers of a vinyl aromatic on an ethylene/propylene/tercomponent rubber especially characterized by an improved notched impact strength and resistance to atmospheric corrosion, and a process for their preparation. Said copolymers are obtained by a two-step mass/suspension polymerization process characterized by the presence of oxygen, preferably by the presence of air, at a pressure of from 0.05 to 10 atmospheres gauge during the course of the mass polymerization step.
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公开(公告)号：DK141849C
公开(公告)日：1980-11-10
申请号：DK91275
申请日：1975-03-06
Applicant: HOECHST AG
IPC: C08F255/00 , C08F255/04 , C08F255/06 , C08F283/12 , C08F291/00
Abstract: The invention relates to novel impact resistant graft copolymers of a vinyl aromatic on an ethylene/propylene/tercomponent rubber especially characterized by an improved notched impact strength and resistance to atmospheric corrosion, and a process for their preparation. Said copolymers are obtained by a two-step mass/suspension polymerization process characterized by the presence of oxygen, preferably by the presence of air, at a pressure of from 0.05 to 10 atmospheres gauge during the course of the mass polymerization step.
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公开(公告)号：DK366676A
公开(公告)日：1977-02-15
申请号：DK366676
申请日：1976-08-13
Applicant: HOECHST AG
IPC: C08F4/00 , C08F2/16 , C08F4/28 , C08F255/00 , C08F255/04 , C08F255/06 , C08F
Abstract: There is disclosed an improved bulk-suspension process for polymerizing vinyl aromatic monomers in the presence of an ethylene-propylene-nonconjugated diene-rubber, which comprises using, in the suspension polymerization step, peroxy-carbonic esters as the polymerization initiator. The process of the invention yields products having improved notched impact strength, weatherability and elongation at break combined with a good shear stability.
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公开(公告)号：SE325027B
公开(公告)日：1970-06-22
申请号：SE1553866
申请日：1966-11-14
Applicant: HOECHST AG
Inventor： WAGENER S , LEDERER M , LENZMANN H
IPC: B01D11/04 , C07C409/34 , C07C73/10
Abstract: 1,168,816. Contacting mutually immiscible liquids. FARBWERKE HOECHST A.G. 15 Nov., 1966 [15 Nov., 1965], No. 51177/66. Addition to 1081776. Heading B1F. [Also in Division C2] A reciprocating plate column for continuously contacting and separating mutually immiscible liquids in countercurrent flow consists of a vertical cylinder 1 with separating chambers 2 and 3 disposed at its upper and lower ends respectively. The column may be made of stainless steel or glass and is surrounded by a cooling jacket. For mixing- purposes there are provided horizontal perforated plates 5 fastened to Vertical shaft 4 and reciprocally movable in a vertical direction. The column is provided with conduits 6, 7, 8 and 9 for the supply of liquids and with overflows 10 and 11 for the removal of the separated liquids. The apparatus is described with reference to the purification of an aqueous solution of a peroxydicarbonate by extraction with an organic solvent and washing of the organic extract with water. When a solvent having a higher specific gravity than water is used, the aqueous peroxydicarbonate solution is supplied through conduit 7, the solvent through conduit 6 and the wash water through conduit 9. Exchange between the phases is promoted by the reciprocatory motion of the plates. The organic solution of the peroxydicarbonate collects in the lower separating chamber 3 and is removed via overflow 10 whilst the wash water collects in the upper chamber 2 and is removed via overflow 11. When a solvent having a lower specific gravity than water is used, the aqueous peroxydicarbonate solution is supplied through conduit 8, the solvent through conduit 9 and the wash water through conduit 6. The organic solution of peroxydicarbonate is then removed through overflow 11 and the wash water through overflow 10. All conduits through which peroxydicarbonate solutions pass are surrounded by cooling jackets.
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