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Patent Agency Ranking
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公开(公告)号：SE345472B
公开(公告)日：1972-05-29
申请号：SE1565669
申请日：1969-11-14
Applicant: HOECHST AG
Inventor： HAEFNER K , CHERDRON H
Abstract: Polyacetals comprising oxymethylene and oxyalkylene units in the main chain of the macromolecules are stabilized against the action of heat and oxygen by means of secondary alkali metal phosphates. Thermoplastic molding compositions prepared from the stabilized polyacetals are suitable for the manufacture of finished and semi-finished products, for example molded articles, household utensils, and parts of machines.
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公开(公告)号：SE320506B
公开(公告)日：1970-02-09
申请号：SE101768
申请日：1968-01-25
Applicant: HOECHST AG
Inventor： HAEFNER K , CHERDRON H
Abstract: Copolymers are prepared by polymerising (a) 60-99.99 weight % of trioxane, (b) 0.01-20% of a comonomer (I) where R1 to R4 are hydrogen or 1-3C alkyl, and n is 0 to 4, and (c) 0-20% of a cyclic ether (II) in the presence of a cationic catalyst, at between -50 and +110 deg.C. The copolymers can be processed and shaped in the thermoplastic state; under certain conditions, cross-linked copolymers are obtained. The non-cross-linked copolymers containing free aldehyde groups can be post-reacted.
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公开(公告)号：SE344956B
公开(公告)日：1972-05-08
申请号：SE842265
申请日：1965-06-24
Applicant: HOECHST AG
Abstract: Copolymers of trioxane and at least one cyclic ether selected from 1,4-butene diol formal, 1,4-butane diglycidyl ether and cyclic ethers of formula in which both R1 groups are the same and each of R1, R2 and R3 represents a hydrogen atom, an alkyl group having 1 or 2 carbon atoms, a halogen-substituted alkyl group having 1 or 2 carbon atoms, and in which R4 is a methylene, oxymethylene, alkyl-substituted methylene, halogen-alkyl-substituted methylene, alkyl substituted oxymethylene or a halogen-substituted oxymethylene group, each halogen-alkyl or alkyl group having one or two carbon atoms, n being 0, 1, 2 or 3, or R4 is -CH2-CH2-O-CH2 or -OCH2-CH2-OCH2- n being 1, are treated at 100 DEG C. to 160 DEG C. with an aqueous solution having a pH of 10 to 10.5 containing a buffer system comprising 0.05 to 1 part of an amine, 0.25 to 2 parts of a compound of formula where x is oxygen and y is NH2 or x and y together are and 0.1 to 1 part of a weak organic or inorganic acid, the first dissociation constant of which is Acids specified are formic, acetic, oxalic, barbituric, phthalic, carbonic and boric acids.
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公开(公告)号：SE344954B
公开(公告)日：1972-05-08
申请号：SE1709167
申请日：1967-12-12
Applicant: HOECHST AG
Inventor： HAEFNER K , CHERDRON H
Abstract: 1,179,260. Preparing oxymethylene polymers with lateral amino groups. FARBWERKE HOECHST A.G. 14 Dec., 1967 [14 Dec., 1966], No. 56833/67. Heading C3P. An oxymethylene copolymer obtained by copolymerizing 60 to 99À99% of formaldehyde or trioxan, 0À01 to 30% of a comonomer containing nitro groups and 0 to 20% of a cyclic ether and/or cyclic acetal in the presence of a cation-active catalyst, suitably at a temperature of -50 to +110 C., is treated to reduce the lateral nitro groups to primary amino groups. Suitable optional comonomers include ethylene and propylene oxides, epichlorhydrin, 1,4- butane diol-, diethylene glycol- or 1,4-butenediol-formal, 1,4-butane-diol-diglycidyl ether, oxacyclobutane and 1,3-dioxolan. Suitable reducing agents are H 2 /palladium, platinum or Raney-nickel, H 2 S/NH 3 or hydrazine hydrate/ alkali, sodium dithionite or Raney-nickel. In the examples, the catalyst for the copolymerization is BF 3 -(C 4 H 9 ) 2 O, the comonomers are trioxan - p - glycidoxynitrobenzene, trioxan - ethylene oxide - p - glycideoxynitrobenzene, trioxan - ethylene oxide - 1 - glycideoxy - 2,4 - dinitrobenzene and trioxan-ethylene oxide- 1-glycideoxy - 4 - nitronaphthalene, and the reducing agent is aqueous hydrazine hydrate solution/ Raney-nicbel.
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