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    Composite expanded plastics
    16.
    发明专利
    Composite expanded plastics 未知

    公开(公告)号：GB1024331A

    公开(公告)日：1966-03-30

    申请号：GB169763

    申请日：1963-01-15

    Applicant: BASF AG

    Inventor： STASTNY FRITZ ,  UNTERSTENHOEFER LEO ,  GRAF FRITZ ,  LOEFFLER HANS-JUERGEN

    IPC: B29C44/34 ,  C08J9/35

    Abstract: An expanded resinous material consists of porous thermoplastic particles the interstices between the particles being filled with a foamed cured synthetic resin. Spherical porous particles of less than 10 mm. diameter may be prepared by incorporating a volatile liquid within particles of polyvinyl chloride, polyethylene, poly(methyl methacrylate), polyurethanes, polyethers, polystyrene or styrene copolymers with butadiene or acrylonitrile and heating the particles above the boiling-point of the liquid. Specified hardenable foamed synthetic resins are urea/formaldehyde, phenol/formaldehyde, melamine/formaldehyde, or polyurethane resins. These may include a surface-active agent and a curing agent. In preparing the material the particles should be tightly packed and the foam added to it. Fillers, e.g. granulated cork, asbestos or fibre waste may also be added. The material may be prepared batchwise by placing particles in a mould with closed side walls and a perforated upper closure, which allows air to pass through but prevents escape of the particles, and introducing the foam at an inlet in the lower part of the mould. The material may then be set in the mould or conveyed elsewhere. In a continuous process particles fed into chamber 2 from hopper 1 are carried by screw 3 to inlet 4 where the foam enters. More plastic may be introduced at a second inlet (not shown) in pipe 5. The foam may be agitated or vibrated and a pressure difference may be used to convey it along the pipe to the site where it is to be solidified. The product may contain 5-95% of the porous resin particles and may be coated, e.g. with asbestos. It can be used to make shaped articles, e.g. structural units or heat insulation. In Examples 1 and 2 particles of expanded polystyrene are mixed with a foamed urea-formaldehyde resin in the apparatus shown. In (1) the particles are expanded with sodium diisopropyl-naphthalene sulphonate, phosphoric acid and air. In (2) oxalic acid was added to the resin. In (3) polyvinyl chloride particles were incorporated into a polyether prepared from pentaerythritol monoglycidyl ether, 4 : 41-diamino-3 : 31-dimethyl-dicyclohexylmethane and H2O2.

    Improvements in the production of paper
    19.
    发明专利
    Improvements in the production of paper 未知

    公开(公告)号：GB834757A

    公开(公告)日：1960-05-11

    申请号：GB2307358

    申请日：1958-07-18

    Applicant: BASF AG

    Inventor： BAUMANN HEINRICH ,  GRAF FRITZ ,  POSCHMANN FRANZ

    IPC: D21H17/47 ,  D21H21/22 ,  D21H21/52 ,  D21H21/54

    Abstract: 834,757. Paper &c. containing porous substances. BADISCHE ANILIN- & SODAFABRIK A.G. July 18, 1958 [July 27, 1957], No. 23073/58. Class 96. Paper, e.g. for filtering, shoe linings, bactericidal use, sound insulation, or multiple-ply cardboard &c. which may be 50% less dense than usual cardboards, is formedfrom, e.g. sulphite or sulphate wood pulp, e.g. with up to 85% of mechanical wood pulp, or from esparto, straw, grasses, linen rags, or waste paper &c. by adding to the pulp, e.g. 5 to 80% of the paper of a porous, hardened condensation product, e.g. of phenol-, or urea-formaldehyde, or such products made from mono- or polymethyl-, propyl-, or butyl-phenols, or thiourea or biuret, or triazines, e.g. melamine, dicyandiamide or guanamide, &c. The foaming of the condensation product may be effected by nitrogen, oxygen, air, carbon dioxide, ammonia, or hydrogen sulphide, in the presence of an anionic wetting agent, and of a protective colloid, e.g. polyacrylic acid salts or casein, and of acidic hardening agents, softeners, &c. The paper pulp or the resin foam may be pigmented and fillers, e.g. china clay, satin white, blanc fixe, titanium white, metal powders, oxides or salts, may be included. The porous condensation products reduce the combustibility of the paper, and small amounts not taken up clarify the white water.

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