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公开(公告)号：ZA731169B
公开(公告)日：1973-12-19
申请号：ZA731169
申请日：1973-02-20
Applicant: HOECHST AG
Abstract: A thermoplastic molding composition is composed of a linear poly(oxymethylene) and a graft copolymer the side chains of which consist essentially of oxymethylene groups. The said graft copolymer acts as a nucleating agent; its effectiveness is dependent on its amount, molecular weight and degree of grafting. Molded articles made of said composition show improved mechanical properties.
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公开(公告)号：GB1292850A
公开(公告)日：1972-10-11
申请号：GB5879169
申请日：1969-12-02
Applicant: HOECHST AG
Abstract: 1292850 Surgical casts FARBWERKE HOECHST AG 2 Dec 1969 [2 Dec 1968] 58791/69 Heading A5R [Also in Division B5] A thermoplastic dressing material comprises (i) a textile fabric impregnated and/or coated on one or both sides with at least one copolymer of trioxan and one or more cyclic formals of the formula in which x+y=0 or 1, the polyacetal having a melting point of 40‹-80‹C and the molar ratio of formal: trioxan being 0.7 to 2.8:1, and (ii) at least one sheet of plastics material and aluminium foil coated on one or both sides with polytetrafluorethylene. The fabric may be of cotton, wool, cellulose acetate, polyester or polyacrylonitrile fibres and preferably weighs 10-100 g/m 2 and has a coating thereon 1-5 mm. thick, muslin bandages are preferred. The sheet may be of polypropylene, polyethylene, polyvinylchloride, polyester, cellulose derivatives or aluminium of 10-100 microns in thickness to which the polyetetrafluoroethylene may be applied from aqueous or organic dispersion, e.g. by spraying. The copolymer preferably has a melting point of 40-80‹C and a reduced specific viscosity of 0.6-1.0 U/g (at 140‹C in butrolactone with concentration of 0.5 g/100 ml) and may be applied by extrusion followed by calendering. The sheet may extend beyond the edges of the impregnated fabric.
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公开(公告)号：ZA705403B
公开(公告)日：1971-05-27
申请号：ZA705403
申请日：1970-08-05
Applicant: HOECHST AG
Inventor： BURG K , WOLTERS E , CHERDRON H , LEUGERING H
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Patent Agency Ranking
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公开(公告)号：SE427113B
公开(公告)日：1983-03-07
申请号：SE1107871
申请日：1971-09-01
Applicant: HOECHST AG
Abstract: Procedure for obtaining stabilized polyoxymethylene molding compounds, characterized in that it comprises: A) mixing: 1) 0.05 to 4% by weight, based on polyoxymethylene, of compounds of the formula ** formula ** Where R1 is a residue of alkyl with 1 to 6 carbon atoms, R2 is a hydrogen atom or an alkyl residue with 1 to 6 carbon atoms, A is a bi- to hexavalent aliphatic hydrocarbon residue, with 1 to 12 carbon atoms, m is 0 or an integer from 1 to 6 and n corresponds to the valence of A, with: 2) 0.01 to 3% by weight, based on polyoxymethylene, of alkaline earth salts of carboxylic acids with 10 to 20 carbon atoms and/or alkaline earth hydroxides and, B) incorporating the obtained mixture into the polyoxymethylene as a stabilizer, either in powder form, through mixers, for example dry mixers or dissolved in a suitable solvent, for example methanol, acetone or methyl chloride, which is stirred on the polymer, returning to evaporating the solvent, optionally then granulating in a commercially available extrusion press. (Machine-translation by Google Translate, not legally binding)
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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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