Hoechst Aktiengesellschaft

Ticona Gmbh

Gunter Schloegl

Herbert Peiffer

Ursula Murschall

Lothar Bothe

Guenther Crass

Thomas Dries

Detlef E Schuhmann

Thomas Wilhelm

Angela Speith

Siegfried Janocha

Adolf Wilhelm

Harald Lohmann

Dieter Scheidecker

Andreas Winter

Walter Spaleck

Frank Osan

Michael Schreck

Wolfgang Dietz

Klaus Thoeren

Winfried Muskalla

Adolf Wilheim

Detlef E Schulhmann

Thomas Wilheim

Karl E Helf

A multilayer polypropylene film which includes at least one base layer containing propylene polymer or a propylene polymer mixture and resin, and at least one outer layer containing .alpha.-olefinic polymers having 2 to 10 carbon atoms is disclosed. The resin has a mean molecular weight of.gtoreq.1500. The invention also relates to a process for the production of the multilayer film, and to the use of the film in a twist wrapping process.

Resin-containing, biaxially oriented, multilayer polypropylene film,

A composite film is described which has at least one base layer which predominantly comprises polypropylene, and at least one top layer. The top layer is sealable and comprises a homopolymer of an olefin. A process for producing the composite film, the top layer olefin homopolymer and packaging material made from the film also are described.

Sealable composite polypropylene film and processes for producing and

A polyolefinic multilayer film comprises a base layer containing polypropylene and at least one outer layer. The outer layer comprises a C.sub.3 /C.sub.4 -olefin resin composition with a low degree of crystallinity and has a minimum heat-sealing temperature of below 84.degree. C. A process for the production of the multilayer film and the use thereof are also described.

Biaxially oriented multilayer polyolefin film which can be heat-sealed

An oriented, heat-sealable, multilayer polyolefin film comprising a base layer containing polypropylene and a heat-sealable outer layer on each side of the base layer. The heat-sealable outer layers contain a propylene copolymer and/or a propylene terpolymer and a mixture of an antiblocking agent having a mean particle diameter of from about 3 to 5 .mu.m and a further antiblocking agent having a mean particle diameter of from about 1 to 2.5 .mu.m.

Heat-sealable, oriented, multilayer polyolefin film

The disclosed oriented polyolefin film contains at least one voided layer. The voided layer contains an amorphous void-initiating polymer which, after orienting, is present as a separate particle inside the void. In the process for producing the polyolefin film, a molten blend comprising an olefin polymer and the amorphous polymer is extruded through a die at an extrusion temperature above the glass temperature or Vicat softening point of the amorphous polymer, the resulting film is drawn off on one or more rollers, and is then subjected to stretch orientation, followed optionally by thermofixing and a surface treatment.

Oriented polyolefin film with amorphous polymer, a process for its

A coextruded, biaxially orientated film comprising a base layer, which comprises a polypropylene or a polypropylene mixture, and at least one top layer comprising olefinic polymers. The top layer comprises a combination of inorganic and/or organic particles and tertiary aliphatic amine of the formula I ##STR1## in which R.sup.1 essentially is an at least partially unsaturated alkyl radical having at least 18 carbon atoms or an essentially completely saturated alkyl radical having 8 to 26 carbon atoms and

Biaxially orientated polpropylene multilayer film, process for its

A sealable, transparent, biaxially oriented multilayer polypropylene film comprising a core layer, optionally one or more intermediate layers located on one or both sides of the core layer, and at least one top layer on the one or more intermediate layers or on one or both sides of the core layer, wherein the core layer contains a polypropylene polymer or a polypropylene mixture; the optional intermediate layers consist essentially of a polypropylene polymer or a polypropylene mixture; and wherein at least one top layer is sealable, comprises a polyolefin copolymer or terpolymer, has a thickness of .ltoreq.0.4 .mu.m, and does not contain silicon dioxide or polydimethylsiloxane. The film is suitable as a packaging or wrapping film.

Sealable, transparent, biaxially oriented multilayer polyprolylene film

This invention provides a polyolefinic multilayer film which has a base layer containing polypropylene and at least one outer layer. The outer layer contains at least 50% by weight of a propylene/butylene resin composition. The propylene/butylene resin composition has a low degree of crystallinity and is modified by a surface treatment, e.g. corona treatment. The surface treatment raises the minimum heat-sealing temperature to the range of 85.degree. to 110.degree. C. and unexpectedly reduces the film's tendency to block. The resulting multilayer film is useful in packaging.

Low temperature heat sealable biaxially oriented polypropylene films

A transparent, coextruded mutilayered polyolefin film which can be sealed on both sides and having a base layer essentially comprised of a resin-modified propylene polymer and top layers essentially comprised of sealable olefin polymers. At 120.degree. C., the multilayered film has a shrinkage in the longitudinal direction of more than 7% and a shrinkage in the transverse direction of more than 5%. The base layer of the film is essentially comprised of a peroxidically degraded propylene polymer, with the degradation factor A being in the range of 3 to 10, and it contains 5 to 25% of a hydrocarbon resin. The top layers of the multilayered film are essentially comprised of a random ethylene/propylene copolymer having an ethylene content of 2 to 8% by weight, a distribution factor V.sub.F of more than 8, and a thermooxidation temperature T.sub.OX of more than 230.degree. C. The film exhibits a surface gloss (angle of measurement 20.degree.) of more than 100 and a haze (measured on four superimposed film plies) of less than 22%.

Biaxially oriented multilayered polyolefin film sealable on both sides

A bowing value, expressed in terms of the curvature, of less than 10 mm is obtained by an additional heat treatment step at temperatures greater than 40.degree. C. to 80.degree. C. after the transverse stretching, the heat-setting and the cooling of the film. The polyolefin film contains a propylene polymer with at least 90% by weight of polypropylene or contains a polypropylene blend.

Biaxially oriented polyolefin film, process for its preparation and its

An oriented multilayer polyolefin film which includes a base layer containing polypropylene, and at least one heat-sealable outer layer. In one embodiment, the base layer contains a tertiary aliphatic amine and an amide of a water-insoluble carboxylic acid having 8 to 24 carbon atoms and the heat-sealable outer layer contains SiO.sub.2. The multilayer film is essentially free from silicone oil and is useful, for example, as a packaging film.

Process for the production of a heat-sealable oriented multilayer

The disclosed oriented, multilayer olefin polymer film comprises an olefin polymer base layer and at least one outer layer, which outer layer contains from 0.01 to 1% by weight, based on the weight of the outer layer, of approximately spherical ceramic particles. The outer layer can be heat-sealable or non-heat-sealable. The multilayer olefin polymer film is produced by a coextrusion process in which the coextruded film is biaxially stretched, heat-set, and optionally surface-treated. The resulting film is useful in packaging and as a printing surface or in laminates.

Heat-seatable or non-heat-sealable, oriented, multilayer polyolefin film

An oriented, heat-sealable, multilayer polyolefin film is described, which includes a base layer containing polypropylene and resin, and at least one heat-sealable outer layer. The heat-sealable outer layer contains a propylene copolymer and/or a propylene terpolymer and a mixture of an antiblocking agent having a mean particle diameter of from 3 to 5 .mu.m and a further antiblocking agent having a mean particle diameter of from 1 to 2.5 .mu.m. In addition, a process for the production of the multilayer polyolefin film and the use of the film are described.

Heat-sealable, oriented, multilayer polyolefin film, process for the

A process for the production of a transparent, printable, biaxially oriented polyolefin multilayer film which can be sealed on both sides including (i) coextruding through a flat die melts corresponding to the individual layers of the film, (ii) taking off and cooling to consolidate the resulting film, via a take-off roll, (iii) biaxially stretching the consolidated film, (iv) thermofixing the biaxially stretched film, and (v) covering top layer C with a non-cohesive layer of polydialkylsiloxane.

Process for the production of a transparent polyolefin multilayer film

An oriented multilayer polyolefin film which comprises a base layer containing polypropylene, and at least one heat-sealable outer layer. In one embodiment, the base layer contains a tertiary aliphatic amine and an amide of a water-insoluble carboxylic acid having 8 to 24 carbon atoms and the heat-sealable outer layer contains SiO.sub.2. The multilayer film is essentially free from silicone oil and is useful, for example, as a packaging film.

Growing community of inventors

Kelkheim, Germany

Gunter Schloegl