摘要:
É descrita uma composição adesiva de uso geral, e particularmente apta a soldagem de peças plásticas, na forma de um bicomponente, sendo que o primeiro bicomponente é uma cola a base de cianoacrilato, e sendo que o dito segundo bicomponente compreende uma blenda, em pó, de um componente de origem polimérica e de um componente de origem orgânica.
摘要:
The present invention relates to an adhesive polyethylene composition for use as an adhesive layer in multilayer articles. The adhesive polyethylene composition according to the invention comprises: A) from 50 to 80 wt.% of a linear low-density polyethylene (LLDPE) obtained by Ziegler-Natta catalyst systems, having a density in the range from 0.915 to 0.925 g/cm 3 and a melt flow index (MFI 190/2.16 ) in the range from 2.5 to 8.0 g/10 min; B) from 15 to 30 wt.% of a high-density polyethylene (HDPE) grafted with a functional monomer, having a density of at least 0.955 g/cm 3 and a melt flow index (MFI 190/21.6 ) in the range from 1.5 to 2.5 g/10 min; C) from 5 to 20 wt.% of an elastomer. The ratio of MFI 190/2.16 of the LLDPE to the HDPE grafted with a functional monomer is in the range from 1:0.2 to 1:0.9, preferably from 1:3 to 1:0.7. In addition to said components (A)-(C), the composition may further comprise optional additives. The invention also relates to a process for manufacturing such an adhesive composition, its use as an adhesive layer in multilayer coatings, in particular, as multilayer insulation of tubes for constructing main gas - and oil pipelines, and to a tube provided with such multilayer insulation comprising a layer of the claimed adhesive composition. The claimed composition maintains high peel strength in an aqueous environment for a long period of time and exhibits resistance of an adhesive peel to cathodic disbondment.
摘要:
A tie resin is provided that is an extrudable blend of anhydride modified polypropylene and anhydride modified polyethylene suitable for use as a tie resin in coextrusions of polypropylene, polyethylene, nylon and EVOH materials.
摘要:
La présente invention se rapporte à un liant pour structures multicouches, comprenant: -de 60% à 95%, en poids de la composition, d'une matrice en polyéthylène choisi parmi les polyéthylènes radicalaires basse densité (PEBD), -de 5% à 40%, en poids de la composition, d'un mélange de deux polyéthylènes, le premier polyéthylène consistant en un polyéthylène métallocène, cogreffé par un acide carboxylique insaturé, monomère de greffage, les greffons d'acide carboxylique insaturé représentant plus de 0,5% en poids du mélange, caractérisée en ce que le second polyéthylène consiste en un polyéthylène radicalaire basse densité (PEBD) et en ce que le MFI ou indice d'écoulement à l'état fondu (norme ASTM D 1238, à 190°C, sous 2,16 kg) est compris entre 4 et 15 g/10 min. Elle concerne également une structure multicouche incorporant le liant et un procédé de fabrication de cette structure multicouche.
摘要:
The invention relates to a wood panel formed of a number of veneer layers, and a method for making it. In accordance with the invention, a thermoplastic material of adhesive quality is arranged between predetermined veneer layers, and the veneer layers are arranged against each other and joined together by means of the thermoplastic material, heat and pressure, to provide a wood panel.
摘要:
This invention relates to a low-density polyethylene composition useful for coating polar substrates. This invention particularly relates to a low-density polyethylene composition useful for coating metal foils, wherein the composition comprises an ethylene/(meth)acrylic acid copolymer having a low acid content.
摘要:
Adhesive compositions comprising a thermoplastic elastomer and a block copolymer with rigid vinyl aromatic blocks and non-rigid blocks of dienes and vinyl aromatic monomers.
摘要:
The present invention provides a resin composition made from admixing starting materials comprising: (a) 0 to 90 parts by weight of a polyolefin; (b) 5 to 95 parts by weight of a functional polyolefin; (c) 5 to 40 parts by weight of a polystyrenic; and (d) 0 to 30 parts by weight of an elastomer, where the total amount of components of (a), (b), (c) and (d) in the resin composition is 100 parts by weight. In a further embodiment, component (a) is a non-olefin copolymer and component (c) is high impact polystyrene. The resin compositions are useful as adhesives for metal and polyolefin substrates.