Vinyl chloride resin compositions used for food containers and f

Details Vinyl chloride resin compositions used for food containers and f Vinyl chloride resin compositions used for food containers and f

1991-09-05

1992-06-02

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524503, 524179, 524400, 524399, C08K 558

Patent

active

051187418

ABSTRACT:
Such food packing materials as heat shrinkable films or such formed containers for food as bottles are manufatured by forming resin compositions of the following compostions: (a) 100 weight parts of vinyl chloride based resin obtained by adding 0.005 to 0.5 weight parts of partially saponified polyvinyl alcohol, degree of saponification 20-55 mol %, means degree of polymerization 150-600, to 100 weight parts of loaded vinyl chloride monomer or a mixture of vinyl based monomer with vinyl chloride as main, during suspension-polymerizing in an aqueous medium under the existence of 0.03-0.08 weight parts of partially saponified polyvinyl alcohol, degree of saponification 65-80 mol %, means degree of polymerization 600-1000, or else in slurry after completion of the suspension-polymerizing: (b) 0.3 to 5 weight parts of non-toxic stabilizer for food which is a liquid composite stabilizer; and (c) 4 to 15 weigth parts of butadiene-styrene based copolymer resin. The food packing materials are resistant to whitening of their surface caused either by contact with water, alcohol, aqueous water of alcohol or incubation for prolonged time under a high temperature and high humidity atmosphere, thus enabling an improvement in their quality.

REFERENCES:
patent: 3892692 (1975-07-01), Heiberger
patent: 4132691 (1979-01-01), Eik
patent: 4528315 (1985-07-01), Eck et al.

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