Ucb Societe Anonyme

Walter Bontinck

Roland Jacobs

Marc D'Hondt

Willy De Coster

Georges Cornille

Heat-sealable packaging film producing a peelable seal, process for the preparation thereof and packages made therefrom or comprising such a film. This film produces such a seal on a wide range of packaging films, including polyester, polyvinyl chloride, polyamide and polyacrylonitrile films owing to:

Heat-sealable packaging film producing a peelable seal

A modified regenerated cellulose film comprising regenerated cellulose and certain modified starches is clear and transparent and has substantially the same mechanical and optical properties as conventional unmodified regenerated cellulose films. The modified starches used are starches degraded by oxidation and/or hydrolysis, uncrosslinked ethers or esters of starch or of starches degraded by oxidation and/or hydrolysis or mixtures thereof. The amount of modified starch used represents 1 to 49% by weight, preferably 5 to 30% by weight, based on the total weight of cellulose and modified starch. Methods for the production of said modified regenerated cellulose film either by the viscose process or by the cuprammonium process are also described.

Films from modified regenerated cellulose

The present invention relates to a process and a composition for the manufacture of an artificial paper requiring neither calendering nor biorientation, the paper obtained having in addition to the characteristics proper to cellulose paper, improved physical properties, such as better impermeability to water vapor and air, resistance to greases and dimensional stability under various atmospheric conditions. The paper is produced by homogenizing in a conventional rotary mixer a composition containing (a) a specific class of rigid polyolefins which provides the necessary stiffness of the paper and constitutes its framework, (b) a polymer which is incompatible with the rigid polyolefin selected from the homopolymers and copolymers containing a preponderant amount of styrene and which provides the hardness and tearability of the paper, (c) a macromolecular material producing compatibility between (a) and (b) which is a mixture prepared in advance from at least one homopolymer of ethylene, propylene or butylene, and at least one homopolymer of isobutylene, butadiene or isoprene, or butyl rubber, and (d) an inorganic filler, subjecting the thus homogenized mixture directly to extrusion to form a material which is suitable as such as a paper substitute, in the absence of further biorientation.

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Sint-Martens-Leerne, Belgium

Walter Bontinck