Mitsubishi Petrochemical Company Limited

Mitsubishi Chemical Corporation

Takashi Matsui

Takao Yazaki

Masataka Noro

Noriyuki Kobayashi

Hironari Sano

Koji Yamamoto

Kazuhide Hayama

Noritaka Hosokawa

Mie Toyoda

A laminated resin film having a thickness of from 7 to 25 .mu.m comprised of (A) a poly(4-methylpentene-1) resin layer having a thickness of from 1 to 10 .mu.m having laminated on one or both sides thereof (B) a crystalline propylene copolymer resin layer comprising from 1 to 10% by weight of ethylene, from 74 to 96% by weight of propylene, and from 3 to 25% by weight of an .alpha.-olefin containing from 4 to 8 carbon atoms and having a thickness of from 2 to 20 .mu.m, provided that the total thickness of layers (B) when provided on each side of layer (A) is in the range of from 4 to 20 .mu.m. The laminated film has excellent cutting properties and high heat resistance sufficient for use in microwave cooking.

Laminated resin film

A process for producing an oriented blown film of a thermoplastic resin by blown film extrusion, carried out by blowing air into an extruded bubble of the resin extruded from a ring die to expand the bubble and cooling the expanded bubble with air from a cooling air ring, wherein blown film extrusion is carried out under such conditions that the ratio of (b) the final diameter of the expanded bubble to (a) the diameter of the bubble at the crystallizing temperature of the thermoplastic resin ((b)/(a)) ranges from 1.5 to 10. The process provides an oriented blown film excellent in strength, appearance, and heat shrinkage characteristics.

Production of oriented thermoplastic films by blown-film extrusion

A polyolefin-based wrapping film having one or more layers which satisfies the following conditions (1) to (4):

Polyolefin-based wrapping film

A laminate film for stretch-wrapping is disclosed, comprising an intermediate layer containing from 50 to 95% by weight of an ethylene-.alpha.-olefin copolymer, a propylene-ethylene-.alpha.-olefin random copolymer, a propylene-.alpha.-olefin random copolymer, a butene-1 homopolymer, or a butene-1-ethylene copolymer and from 5 to 50% by weight of a hydrogenated block copolymer elastomer having laminated on both sides thereof a surface layer comprising from 75 to 95% by weight of ethylene and from 5 to 25% by weight of vinyl acetate. The film is excellent in stretchability, softness, tear strength, and in particular deformation recovery properties.

Laminate film for stretch-wrapping and process for producing the same

A process for producing a propylene resin formed article with a hard coat is disclosed, comprising forming an ultraviolet-curing acrylic resin coating film on the surface of a propylene resin film or sheet, subjecting the film or sheet with the coating film to thermoforming, and irradiating the coating film to ultraviolet rays to cure said ultraviolet-curing resin, wherein said propylene resin film or sheet is composed of at least a propylene resin surface layer containing substantially no nucleating agent on which surface is coated said acrylic resin film and a thermoplastic resin base layer containing a nucleating agent which is laminated on the other side of said propylene resin surface layer prior to the thermoforming. The hard coat on the propylene resin formed article has high gloss.

Process for producing propylene resin formed articles with hard coat

A method for producing an antibacterial molded article of polyolefin resin is described, comprising molding a polyolefin resin composition having compounded therewith 0.01% by weight or more, based on the polyolefin resin composition, of an antibacterial agent which is a zeolite containing silver to form a molded article of a desired shape, and thereafter subjecting the antibacterial surface of the molded article to a corona discharge treatment.

Growing community of inventors

Mie, Japan

Takashi Matsui