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公开(公告)号：ZA8001498B
公开(公告)日：1981-04-29
申请号：ZA8001498
申请日：1980-03-14
Applicant: HOECHST AG
Inventor： HERWIG W , BURG K , SPANKEREN U , LUEDERS W
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公开(公告)号：DK140850C
公开(公告)日：1980-04-28
申请号：DK496675
申请日：1975-11-05
Applicant: HOECHST AG
Inventor： SEXTRO G , BURG K , LEUGERING H J , SCHLAF H , HELLER A
Abstract: Oxymethylene polymers (POM) are obtained in granular form by cooling a POM solution or dispersion having a temperature above the sintering temperature of the POM in two stages to a temperature just below the said sintering temperature. The solvent or dispersion agent used is a mixture of methanol and water and the cooling agent is a methanol/water mixture which may contain POM suspended therein. The granular POM obtained is suitable as technical material for making shaped articles.
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Patent Agency Ranking
公开(公告)号：SE7803740L
公开(公告)日：1979-05-09
申请号：SE7803740
申请日：1978-04-03
Applicant: HOECHST AG
Inventor： BECKER U , BURG K , FISCHER J P , HEIMBURGER N
IPC: C08F291/00 , A61L33/00 , A61L33/06 , C08F8/12 , C08F255/00
Abstract: What is disclosed is a plastics material adaptable to biomedical uses, the surface of which material at least partially consists of a graft copolymer having a hydrocarbon main chain and side chains grafted thereon, said side chains being polymers comprising at least one vinyl monomer selected from the group consisting of acrylic acid esters of the formula CF3-(CF2)x-(CH2)y-O-CO-CH=CH2, where x is an integer from 3 to 16 and y is an integer from 1 to 12, vinylene carbonate, N-vinyl alkylamides of the formula wherein R1 and R2 are the same or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
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公开(公告)号：DK565776A
公开(公告)日：1977-06-18
申请号：DK565776
申请日：1976-12-16
Applicant: HOECHST AG
Abstract: Vinylene carbonate may be polymerized in bulk, in solution or in dispersion by means of free radical forming initiators. Suitable comonomers are vinyl compounds. The polymerization is carried out generally at a temperature of 40 to 170 DEG C. The dispersing agents used in the dispersion polymerization are organic compounds which are liquid under normal conditions and which do not dissolve vinylene carbonate. Homo- and copolymers of vinylene carbonate may be used as starting material for the preparation of homo- and copolymers of vinylene glycol.
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公开(公告)号：IN140211B
公开(公告)日：1976-09-25
申请号：IN310CA1975
申请日：1975-02-18
Applicant: HOECHST AG
Abstract: Oxymethylene copolymer having heat and hydrolysis resistant terminal groups is prepared by heating the polymers present in a liquid phase, whereby a thermal degradation of the unstable terminal groups takes place. The degradation is advantageously effected in the presence of a calcium or magnesium salt of an aliphatic carboxylic acid of low molecular weight. The oxymethylene copolymers are suitable as engineering plastic for preparing semi-finished products and finished products.
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