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    Moulded bodies of foamed polyolefin - free from cavities, useful as packing and insulation material
    2.
    发明专利
    Moulded bodies of foamed polyolefin - free from cavities, useful as packing and insulation material 未知

    公开(公告)号：DE2331305A1

    公开(公告)日：1975-01-23

    申请号：DE2331305

    申请日：1973-06-20

    Applicant: BASF AG

    Inventor： TATZEL HERMANN ,  KOEGEL WOLFRAM ,  BECK GILBERT DIPL CHEM ,  ZUERN LUDWIG DIPL CHEM DR ,  CAESAR ARNDT CHRISTIAN

    IPC: C08J9/236 ,  C08J9/22 ,  C08L23/00

    Abstract: Prodn. of moulded bodies comprises mixing finely divided foam-forming polyolefin particles with 0.3 to 4 g., pref. 0.6-2 g., (per 1. of polyolefin) of a solvent-free hardenable blinder, pressing together the mixt. to 5-70% (pref. 40-70%) of its bulk volume, and hardening under pressure, and introducing needles of dia. is not >5 mm, into the mixt. before, during or after the step of pressing the mixt. and removing the needles again before the hardening step. The polymers are derived from 2-4C olefins, and have an X-ray crystallinity at 25 degrees C >25 wt%., e.g. homopolymers or copolymers of ethylene and propylene; esp. copolymers of ethylene with esters of (meth)acrylic acid or vinylcarboxylic acid esters contg. >=50 wt% of ethylene units. The introduction and removal of the needles forms channels through which air can escape from the mixt. and the resulting moulded bodies are free from cavities. The prods. can be used for forming shock-absorbing packing matl., sound-absorbing plates, and insulation in the building industry.

    Foamed polyolefin mouldings free of cavities - suitable for insulation, upholstery or packaging
    4.
    发明专利
    Foamed polyolefin mouldings free of cavities - suitable for insulation, upholstery or packaging 未知

    公开(公告)号：DE2331306A1

    公开(公告)日：1975-01-23

    申请号：DE2331306

    申请日：1973-06-20

    Applicant: BASF AG

    Inventor： TATZEL HERMANN ,  KOEGEL WOLFRAM ,  BECK GILBERT DIPL CHEM ,  ZUERN LUDWIG DIPL CHEM DR ,  CAESAR ARNDT

    IPC: C08J9/22 ,  C08J9/236 ,  B29D27/00

    Abstract: Foamed articles are made by compressing a mixt. of finely divided polyolefin with 0.3-4.0 g, per l, polyolefin, of a solvent-free curable blinder to 40-80% of the original bulk vol. of the mixt., whilst treating it with a gas of greater permeability coefft. than air. The polyolefin specif. has a crystallinity of >20 wt% at 25 degrees C and MFI 0.1-200 g/10 mins (190 degrees C/2.16 Kg, ASTM-D 1238-65T) and pref. is high pressure polyethylene of 0.918-0.935 g/cm3. The granules have an ave. dia. of 1-35 mm, pref. 3-20 mm and have a bulk density of 5-200 g/l, pref. 10-60 g/l. The binder is esp. a polyester or an epoxy resin, pref. in an amt. 0.6-2 g/l. The gas, (permeability coefft. measured to ASTM D 1434-63), is pret. ammonia or CO2, though (halogenated) hydrocarbons (b.pt. is not >15 degrees C) or CO may also be used. Compression is pref. to 50-70 vol%.

    Foamed polyolefins mouldings free of cavities - suitable for insulation, upholstery or packaging
    5.
    发明专利
    Foamed polyolefins mouldings free of cavities - suitable for insulation, upholstery or packaging 未知

    公开(公告)号：DE2331303A1

    公开(公告)日：1975-01-23

    申请号：DE2331303

    申请日：1973-06-20

    Applicant: BASF AG

    Inventor： TATZEL HERMANN ,  KOEGEL WOLFRAM ,  BECK GILBERT DIPL CHEM ,  ZUERN LUDWIG DIPL CHEM DR ,  CAESAR ARNDT CHRISTIAN

    IPC: C08J9/22 ,  C08J9/232 ,  B29D27/00

    Abstract: Foamed polyolefin articles are made by heating and compressing foamed cross-linked polyolefin granules in moulds which are not gas-tight while treating them with a gas whose permeability coefficient is greater than that of air. The polyolefin has a crystallinity of >20 wt% at 25 degrees C and MFI of 0.1-200 g/10 mins (190 degrees C/2.16 Kg) and is pref. high pressure polyethylene of 0.918-0.935 g/cm3. The granules have an ave. dia. of 1-35 mm, pref. 3-20 mm and a bulk density of 5-200 g/l, pref. 10-60 g/l. The gas, (permeability coeff. measured to D/N 53380 or ASTM D 1434-63), is pref. ammonia or CO2. The granules, heated to 40-80 degrees C in the presence of the gas are transferred to the mould and sintered at 5-150 degrees C, pref. 10-100 degrees C above their crystalline m.pt., i.e. at 90-250 degrees C, pref. 110-180 degrees C. After heating, the granules are compressed to 40-80% pref. 50-70% of their original vol.

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